Gasulla Forner, Manuel
Total activity: 115
Professional category
University lecturer
Doctoral courses
Enginyer de Telecomunicació
Research group
E-CAT - Electronic Circuits And Transducers
Department
Department of Electronic Engineering
School
Castelldefels School of Telecommunications and Aerospace Engineering (EETAC)
E-mail
manel.gasullaupc.edu
Contact details
UPC directory Open in new window
Orcid
0000-0002-0364-6806 Open in new window
ResearcherID
H-6620-2013 Open in new window
Scopus Author ID
6602798272 Open in new window

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1 to 50 of 115 results
  • Inductive power transmission for autonomous sensors: voltage regulation effects on efficiency

     Albesa Querol, Joan Miquel; Reindl, Leonhard Michael; Gasulla Forner, Manuel
    International Multi-Conference on Systems, Signals and Devices
    p. 6564081-1-6564081-6
    DOI: 10.1109/SSD.2013.6564081
    Presentation's date: 2013-03
    Presentation of work at congresses

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    This work proposes the use of inductive links in order to wirelessly power autonomous sensors. In order to increase the powering distance and the power efficiency, resonant tanks were considered. To drive the transmitting resonant network, a commercial class D amplifier was used. Working frequency was restricted to 150 kHz. Commercial magnetic-core coils were selected as they provide high coil values and quality factors in a small-size factor, which is a requirement for the intended application. At the receiving network, a rectifier and a voltage regulator were used to provide a DC voltage supply to the autonomous sensor. Three kinds of voltage regulators were compared from the point of view of the power efficiency. Both a theoretical analysis and experimental results are presented. Computed graphs show that operating points for the shunt regulator always lead to a higher power efficiency. Experimental tests were carried out using a mechanical setup to fix the coil-to-coil distances. Results show that shunt regulators provide the best power efficiency over the other alternatives, which are linear series and switching buck regulators.

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    A high-efficiency matching technique for low power levels in RF harvesting  Open access

     Anchustegui Echearte, Iker; Jimenez Lopez, David; Gasulla Forner, Manuel; Giuppi, Francesco; Georgiadis, Apostolos
    Progress in Electromagnetics Research Symposium
    p. 1806-1810
    Presentation of work at congresses

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    Radiofrequency (RF) energy can be harvested in order to power autonomous sensors either from the surrounding environment or from dedicated sources. A conventional RF harvester is mainly composed by an antenna, a matching network and a rectifier. At low power levels, e.g., -10dBm and below, the corresponding voltage amplitude at the antenna is low and comparable to the voltage drop of the diodes used in the rectifier. In order to boost the voltage at the rectifier input and thus the rectifier efficiency, an L-network optimized for an input power of -10dBm at 868MHz is proposed in this work. As for the rectifier, a half-wave rectifier with a single zero-bias Schottky diode (HSMS2850) was selected. First, a theoretical analysis was performed followed by simulations with ADS (Harmonic Balance). Simulations show efficiencies of 75% for an input power of -10dBm with ideal components but using the actual model of the diode rectifier. The incorporation of the PCB layout effects and the actual components decreases the efficiency to below 50%. Finally, a PCB implementation was performed using a 0.5 pF capacitor and a 27 nH inductor for the L network. The input power was generated by an RF generator. The RF-to-DC efficiency was of 45% at 868 MHz with an optimum load of 2.5 k¿. Efficiencies of 34.5% and 22.5% were achieved at -15dBm and -20dBm, respectively.

  • Monitoring Switch-type Sensors and Powering Autonomous Sensors via Inductive Coupling. Application to Removable Seats in Vehicles  Open access

     Albesa Querol, Joan Miquel
    Department of Electronic Engineering, Universitat Politècnica de Catalunya
    Theses

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    This thesis explores the feasibility of using inductive links for a vehicle application where wiring an electronic control unit (ECU) to the sensors or detectors become unfeasible or unpractical. The selected application is occupancy and belt detection in removable vehicle seats. Two ways of using inductive links are considered: 1) passive detection of the state of the seat detectors from a readout unit and 2) remote power transmission to a detection unit and subsequent data transmission by a wireless transceiver. Inductive links have been widely proposed for sensors placed in harsh or inaccessible environments, where wiring is unpractical. Usually, the sensor forms part of an LC resonant network. The resonant frequency is dependent on the quantity to be measured and is estimated from a coupled reader. We propose the use of inductive links for switch-type sensors. First, a comprehensive analysis for an arbitrary number of sensors is presented. Secondly, we show the feasibility of using inductive links for occupancy and belt detection in removable vehicle seats. The state (open or closed) of the related sensors was attained by first measuring the equivalent resistance of the readout inductor and then estimating its resonant frequency. Commercial ferrite-core coils were used to increase the detection distance. Experimental tests were carried out using an impedance analyzer connected to the readout coil and commercial seat detectors connected to the resonant network. The detection of the sensors¿ state was feasible at all tested distances, from 0.5 cm up to 3 cm. The second proposed alternative consists on remote powering, via an inductive link, the electronic device where the seat detectors are connected. Resonant coupled coils were used in order to increase the powering distance range and the power efficiency. Working frequency was restricted to 150 kHz. Commercial small-size magnetic-core coils were selected and their resistance and quality factor over frequency measured. At the receiving network, a rectifier and a voltage regulator were required to provide a DC voltage supply to the autonomous sensor. Four type of voltage regulators were compared from the point of view of the system power efficiency. Both a theoretical analysis and experimental results are presented. Results showed that shunt regulators provide the best power efficiency over the other alternatives, which are linear series and switching buck and boost regulators. On the other hand boost regulators led to an unstable behavior of the system in most of the cases. The use of rechargeable batteries was also considered in order to increase the power efficiency. Achieved power efficiencies were around 40%, 25% and 10% for coil distances of 1 cm, 1.5 cm and 2 cm respectively. Experimental tests also showed that the autonomous sensor was properly powered up to coil distances of 2.5 cm. Finally, different types of coils were assessed and the effect of metallic structures analyzed for the intended application. The final aim is, on the one hand, to increase the powering distance and, on the other hand, to minimize the influence of the metallic structures. Three different coil types, two with ferrite-core coils and one with an air-core coil were used. Numerical results showed that ferrite-core coils are less affected by the presence of metallic structures. Experimental results showed that the air-core coils provided a larger powering distance thanks to its much larger winding diameter. However, when approaching a metallic plate, the transferred power with the air-core coils to the load was insufficient for the intended application. On the other hand, ferrite-core coils barely noticed the presence of the metallic plate. As for the passive detection, the presence of a metallic plate below the primary air-core coil slightly affected the measured resistance values but detection for the four possible states of the seat detectors was still possible.

    Algunes aplicacions a l'entorn de l'automòbil no són possibles si no és mitjançant la connexió sense fils dels seus dispositius a causa que el cablejat és difícil o inviable. Alguns exemples els trobem en el monitoratge de sensors situats en parts rotatòries, com les rodes, o en elements extraïbles, com els seients. Els sistemes de monitoratge de la pressió de l'aire en les rodes (TPMS) són d'obligat compliment als EUA i ho seran en breu també als països membres de la UE per als vehicles de categories M1 o N1 aprovats a partir de l'1 de novembre de 2012 o per als vehicles matriculats a partir de l'1 de novembre de 2014. Actualment, els sistemes TPMS existents al mercat estan alimentats per piles. Amb tot, la vida útil exigida per a les bateries és d'uns 10 anys, esdevenint el seu ús un autèntic repte. Un altre element en contra de l'ús de bateries és la directiva 2006/66/CE que limita el nombre màxim permès en els vehicles. D'altra banda, moltes furgonetes o mini furgonetes i vehicles familiars incorporen seients extraïbles amb l'objectiu d'aprofitar al màxim l'espai interior. Alguns models comercials incorporen en el seient extraïble el detector de cinturó de seguretat. Per evitar el cablejat, existeixen sistemes de detecció passiva mitjançant acoblament inductiu. A partir del present any 2012, una regulació de la agència nord-americana NHTSA requereix de l'ús de coixins de seguretat intel·ligents per minimitzar els riscos en nens. Aquests seients intel·ligents haurien de detectar si el passatger és un adult, una cadira infantil o si està lliure per evitar problemes ocorreguts en anterioritat amb els sistemes coixí de seguretat. Els sensors usats per a aquests coixins de seguretat intel·ligents requeririen d'energia per operar. Una opció per als seients extraïbles és la transmissió de potència via acoblament inductiu des del terra del xassís del vehicle fins al seient. També és possible usar l'acoblament inductiu per detectar l'estat de diversos sensors existents en els seients extraïbles mitjançant detecció passiva. Precisament, la detecció d'ocupació i de cinturó de seguretat en seients extraïbles ha estat seleccionada per aplicar la investigació present que consisteix, d'una banda, en el monitoratge de sensors de tipus commutat (dos possibles estats) via acoblament inductiu i, per una altra, en la transmissió mitjançant el mateix principi físic de la potència necessària per alimentar els sensors autònoms remots. En els dos casos, una primera bobina es fixaria en el seient extraïble, connectada als sensors, i una segona bobina se situaria sota la primera, en el terra del vehicle.

  • Voltage regulation on inductive power links for autonomous sensors

     Albesa Querol, Joan Miquel; Gasulla Forner, Manuel
    IEEE International Instrumentation and Measurement Technology Conference
    p. 2678-2682
    DOI: 10.1109/I2MTC.2012.6229438
    Presentation's date: 2012-05-16
    Presentation of work at congresses

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  • Inductive power transfer for autonomous sensors in presence of metallic structures

     Albesa Querol, Joan Miquel; Gasulla Forner, Manuel
    IEEE International Instrumentation and Measurement Technology Conference
    p. 664-669
    DOI: 10.1109/I2MTC.2012.6229658
    Presentation's date: 2012-05-14
    Presentation of work at congresses

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  • A Closed-Loop Maximum Power Point Tracker for Subwatt Photovoltaic Panels

     Lopez Lapeña, Oscar; Penella Lopez, Maria Teresa; Gasulla Forner, Manuel
    IEEE transactions on industrial electronics
    Vol. 59, num. 3, p. 1588-1596
    DOI: 10.1109/TIE.2011.2161254
    Date of publication: 2012-03
    Journal article

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  • Monitoring switch-type sensors via inductive coupling: application to occupancy and belt detection in removable vehicle seats

     Albesa Querol, Joan Miquel; Gasulla Forner, Manuel
    IEEE transactions on power electronics
    Vol. 27, num. 11, p. 4472-4480
    DOI: 10.1109/TPEL.2012.2190098
    Date of publication: 2012
    Journal article

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    Wireless power transmission for autonomous sensors in removable vehicle seats  Open access

     Gasulla Forner, Manuel; Albesa Querol, Joan Miquel
    IEEE Vehicular Technology Conference
    DOI: 10.1109/VETECF.2011.6093155
    Presentation's date: 2011-09-08
    Presentation of work at congresses

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    Postprint (author’s final draft)

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    Seat occupancy and belt detection in removable seats via inductive coupling  Open access

     Gasulla Forner, Manuel; Albesa Querol, Joan Miquel
    IEEE Vehicular Technology Conference
    DOI: 10.1109/VETECF.2011.6093145
    Presentation's date: 2011-09-07
    Presentation of work at congresses

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  • Dispositivo para la detección de ocupación y cinturón de seguridad en asientos extraíbles de vehículos vía acoplo inductivo

     Gasulla Forner, Manuel; Albesa Querol, Joan Miquel
    Date of request: 2011-09-05
    Invention patent

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    Dispositivo para la transmisión de energía para sensores autónomos en asientos extraíbles de vehículos vía acoplo inductivo.

    El dispositivo propuesto transmite energía vía acoplo inductivo a sensores autónomos ubicados en asientos extraíbles. Una primera bobina se dispone en el chasis del vehículo y una segunda bobina se dispone en el asiento extraíble en el que se hallan los sensores autónomos que se quiere alimentar. Sendas capacidades se disponen en serie o paralelo con las bobinas para formar sendos circuitos resonantes. La primera bobina se conecta a un circuito que genera una señal de frecuencia igual a la frecuencia de resonancia. La segunda bobina se conecta a una etapa de rectificación y regulación a fin de alimentar adecuadamente uno o varios sensores autónomos. Cada sensor autónomo incluye: uno o varios sensores o detectores del asiento extraíble, como por ejemplo un detector de ocupación y un detector de cinturón de seguridad; un procesador digital de señal o microcontrolador; un transceptor inalámbrico para transmisión de datos.

  • Método para la monitorización del estado de detectores en asientos extraíbles de vehículos vía acoplo inductivo

     Gasulla Forner, Manuel; Albesa Querol, Joan Miquel
    Date of request: 2011-09-05
    Invention patent

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    Método para la monitorización del estado de detectores en asientos extraíbles de vehículos vía acoplo inductivo.

    El método propuesto utiliza el acoplo inductivo entre una primera bobina situada en el chasis del vehículo y una segunda bobina situada en el asiento extraíble del vehículo para monitorizar el estado de detectores en dicho asiento extraíble. En el asiento extraíble se disponen junto con la segunda bobina los detectores, por ejemplo de ocupación y de cinturón de seguridad, y capacidades asociadas formando un circuito resonante. Se mide la resistencia en función de la frecuencia que presenta la primera bobina y se detecta la frecuencia (de resonancia) que presenta un máximo de la resistencia. Dicha frecuencia de resonancia depende del estado de los detectores. A partir de la frecuencia de resonancia se determina el estado de los detectores del asiento extraíble.

  • Powering autonomous sensors: an integral approach with focus on solar and rf energy harvesting

     Penella López, María Teresa; Gasulla Forner, Manuel
    DOI: 10.1007/978-94-007-1573-8
    Date of publication: 2011
    Book

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  • Methods and circuits for the efficient management of power and energy in autonomous sensors

     Penella Lopez, Maria Teresa
    Department of Electronic Engineering, Universitat Politècnica de Catalunya
    Theses

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    A new MPPT method for low-power solar energy harvesting  Open access

     Lopez Lapeña, Oscar; Penella Lopez, Maria Teresa; Gasulla Forner, Manuel
    IEEE transactions on industrial electronics
    Vol. 57, num. 9, p. 3129-3138
    DOI: 10.1109/TIE.2009.2037653
    Date of publication: 2010-09
    Journal article

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    This paper describes a new maximum-power-pointtracking (MPPT) method focused on low-power (< 1 W) photovoltaic (PV) panels. The static and dynamic performance is theoretically analyzed, and design criteria are provided. A prototype was implemented with a 500-mW PV panel, a commercial boost converter, and low-power components for the MPPT controller. Laboratory measurements were performed to assess the effectiveness of the proposed method. Tracking efficiency was higher than 99.6%. The overall efficiency was higher than 92% for a PV panel power higher than 100 mW. This is, in part, feasible due to the low power consumption of the MPPT controller, which was kept lower than 350 μW. The time response of the tracking circuit was tested to be around 1 s. Field measurements showed energy gains higher than 10.3% with respect to a direct-coupled solution for an ambient temperature of 26 ◦C. Higher gains are expected for lower temperatures.

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    Runtime extension of low-power wireless sensor nodes using hybrid-storage units  Open access

     Penella Lopez, Maria Teresa; Gasulla Forner, Manuel
    IEEE transactions on instrumentation and measurement
    Vol. 59, num. 4, p. 857-865
    DOI: 10.1109/TIM.2009.2026603
    Date of publication: 2010-03
    Journal article

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    The sensor nodes of wireless sensor networks remain inactive most of the time to achieve longer runtimes. Power is mainly provided by batteries, which are either primary or secondary. Because of its internal impedance, a significant voltage drop can appear across the battery terminals at the activation time of the node, thus preventing the extraction of all the energy from the battery. Additionally, internal losses can also be significant. Consequently, the runtime is reduced. The addition of a supercapacitor in parallel with the battery, thus forming a hybrid-storage device, has been proposed under pulsed loads to increase the power capabilities and reduce both the voltage drop and the internal losses at the battery. However, this strategy has not yet thoroughly been analyzed and tested in low-power wireless sensor nodes. This paper presents a comprehensive theoretical analysis that extends previous works found in the literature and provides design guidelines for choosing the appropriate supercapacitor. The analysis is supported by extensive experimental results. Two low-capacity (< 200 mAh) batteries were tested together with their hybrid-storage unit counterparts when using an electronic load as a pulsed current sink. The hybrid-storage units always achieved a higher runtime. One of the batteries was also tested using a sensor node. The runtime extension was 16% and 33% when connecting the hybrid-storage unit directly and through a dc–dc switching regulator to the sensor node, respectively.

  • Thermal energy harvesting through pyroelectricity

     Cuadras Tomas, Angel; Gasulla Forner, Manuel; Ferrari, Vittorio
    Sensors and actuators A. Physical
    Vol. 158, num. 1, p. 132-139
    DOI: 10.1016/j.sna.2009.12.018
    Date of publication: 2010-03
    Journal article

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    Pyroelectric cells based on fabricated screen-printed PZT and commercial PVDF films are proposed as thermal energy harvesting sources in order to supply low-power autonomous sensors. The cells are electrically modelled as a current source in parallel with output impedance. Heating and cooling temperature fluctuations generated by air currents were applied to the pyroelectric converters. The generated currents and charges were respectively in the order of 10−7 A and 10−5 C for temperature fluctuations from 300K to 360K in a time period of the order of 100 s, which agrees with the theoretical model. Parallel association of cells increased the generated current. The dependence of the generated current on relevant technological parameters has been also characterized. Finally, current from cyclic temperature fluctuations was rectified and stored in a 1 F load capacitor. Energies up to 0.5 mJ have been achieved, enough to power typical autonomous sensor nodes during a measurement and transmission cycle.

  • Método y aparato para detección contínua de ocupación de asientos por uso conjunto de sensores de peso, capacitivos y térmicos

     Pallas Areny, Ramon; Casas Piedrafita, Jaime Oscar; Gasulla Forner, Manuel; Aliau Bonet, Carles; Gaitan Pitre, Jorge Eliécer
    Date of request: 2010-02-23
    Invention patent

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    Novel and low-cost temperature compensation technique for piezoresistive pressure sensors  Open access

     Reverter Cubarsí, Ferran; Horak, Goran; Bilas, Vedran; Gasulla Forner, Manuel
    IMEKO World Congress
    p. 2084-2087
    Presentation's date: 2009-09-10
    Presentation of work at congresses

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    This paper proposes a low-cost technique to compensate for the temperature dependence of piezoresistive pressure sensors configured in a Wheatstone bridge. The sensor is treated as a resistive circuit and three equivalent resistances are measured by setting appropriately the bridge terminals. One of these equivalent resistances depends on temperature but not on pressure and, hence, it can be used to compensate for the temperature dependence of the output parameter. In such a way, neither data of a previous temperature calibration nor additional components are required to compensate for the temperature dependence. The proposed technique is applied to a commercial pressure sensor, which is measured by means of a direct sensor-tomicrocontroller interface circuit. Experimental results show that temperature effects on the pressure measurement decrease more than ten times when the proposed technique is applied.

  • Analysis of a Direct Interface Circuit for Capacitive Sensors

     Gaitan Pitre, Jorge Eliécer; Gasulla Forner, Manuel; Pallas Areny, Ramon
    IEEE transactions on instrumentation and measurement
    Vol. 58, num. 9, p. 2931-2937
    DOI: 10.1109/TIM.2009.2016782
    Date of publication: 2009-09
    Journal article

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    We present the theoretical analysis and performance results of a direct microcontroller unit (MCU) interface circuit for capacitive sensors based on the charge-transfer method, when stray capacitances are considered. The interface circuit can implement two alternative two-point calibration techniques that reduce the effects of stray capacitance, temperature, and MCU parameters that depend on the power supply voltage. The best measurement deviation achieved from 0degC to 50degC and for power supply voltage from 4.0 to 5 V is below 0.01 full-scale range (FSR) for the two subranges from 10 to 100 pF and from 100 pF to 1 nF and 0.08 FSR for the subrange from 2 to 10 pF.

  • Improving the performance of direct interface circuits using the Vernier technique

     Sifuentes, Ernesto; Gasulla Forner, Manuel; Casas Piedrafita, Jaime Oscar; Reverter Cubarsí, Ferran
    IEEE International Instrumentation and Measurement Technology Conference
    p. 1300-1303
    DOI: 10.1109/IMTC.2009.5168656
    Presentation's date: 2009-05
    Presentation of work at congresses

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  • Pervasive computing aproaches to environmental sustainability

     Cardanas-Tamayo, Rolando A.; Miller, Timothy M.; Rich, Patrick; Davis, Janet; Albesa Querol, Joan Miquel; Gasulla Forner, Manuel; Higuera Portilla, Jorge Eduardo; Penella Lopez, Maria Teresa; Polo Cantero, Jose; Fernández-Montes, Alejandro; Grado-Caffaro, Maria-Angeles; Kappel, Karin; Grechenig, Thomas; Umut, Lhan; Uçar, Erden; Wall, Josh; Ward, John
    IEEE pervasive computing
    Vol. 8, num. 1, p. 54-57
    DOI: 10.1109/MPRV.2009.14
    Date of publication: 2009-01-01
    Journal article

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    A ZigBee wireless sensor network compliant with the IEEE1451 standard  Open access

     Higuera Portilla, Jorge Eduardo; Polo Cantero, Jose; Gasulla Forner, Manuel
    IEEE Sensors Applications Symposium
    p. 309-313
    Presentation of work at congresses

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    Wireless sensor networks are becoming very attractive for monitoring and control applications with smart sensor nodes. We present an implementation of a ZigBee wireless sensor network compliant with the IEEE1451 standard to improve the interoperability. This paper describes the message structure, commands and transactions. Furthermore, a proposal is presented to enhance the IEEE1451.5 ZigBee physical transducer electronic datasheet (PHY TEDS).

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    Powering wireless sensor nodes: primary batteries versus energy harvesting  Open access

     Penella Lopez, Maria Teresa; Albesa Querol, Joan Miquel; Gasulla Forner, Manuel
    IEEE International Instrumentation and Measurement Technology Conference
    p. 1625-1630
    Presentation of work at congresses

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    Wireless sensor networks (WSNs) are increasingly used in many fields. Still, power supply of the nodes remains a challenge. Primary batteries are mainly used but energy harvesting offers an alternative, although not free of problems. This paper compares the use of primary batteries against solar cells. Basic principles are first enunciated, then generic design examples are presented and finally actual deployed nodes of a WSN are illustrated.

  • Battery Squeezing under Low-Power Pulsed Loads

     Penella Lopez, Maria Teresa; Gasulla Forner, Manuel
    IEEE International Instrumentation and Measurement Technology Conference
    p. 1184-1188
    Presentation of work at congresses

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  • Energy Harvesting for Autonomous Sensors

     Gasulla Forner, Manuel; Penella López, María Teresa
    Date of publication: 2007-11
    Book chapter

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  • TEC2007-66331 Interfaces Electrónicas para sensores autónomos

     Cuadras Tomas, Angel; Pallas Areny, Ramon; Gasulla Forner, Manuel; Lopez Lapeña, Oscar; Serrano Finetti, Roberto Ernesto; Casanella Alonso, Ramon
    Competitive project

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  • Sensórica. El mundo de los sensores y sus interfaces

     Casas Piedrafita, Jaime Oscar; Pallas Areny, Ramon; Gasulla Forner, Manuel
    Mundo electrónico. Edición internacional
    num. 390, p. 78-80
    Date of publication: 2007-10
    Journal article

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  • Sensórica. El mundo de los sensores. Sensores para monitorización ambulatoria continua

     Casas Piedrafita, Jaime Oscar; Gasulla Forner, Manuel; Pallas Areny, Ramon
    Mundo electrónico. Edición internacional
    num. 387, p. 78-81
    Date of publication: 2007-06
    Journal article

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  • Sensorica. El mundo de los sensores y sus interfaces. Baterías

     Casas Piedrafita, Jaime Oscar; Gasulla Forner, Manuel; Pallas Areny, Ramon
    Mundo electrónico. Edición internacional
    num. 383, p. 56-58
    Date of publication: 2007-02
    Journal article

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  • Analysis of power-supply interference effects on direct sensor-to-microcontroller interfaces

     Reverter Cubarsí, Ferran; Gasulla Forner, Manuel; Pallas Areny, Ramon
    IEEE transactions on instrumentation and measurement
    Vol. 56, num. 1, p. 171-177
    DOI: 10.1109/TIM.2006.887401
    Date of publication: 2007-02
    Journal article

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  • Alimentación de sensores autónomos. Captación de energía del entorno

     Penella López, María Teresa; Gasulla Forner, Manuel; Pallas Areny, Ramon
    Mundo electrónico. Edición internacional
    num. 383, p. 46-50
    Date of publication: 2007-02
    Journal article

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  • REALnet: an environmental WSN testbed

     Albesa Querol, Joan Miquel; Casas, R; Penella Lopez, Maria Teresa; Gasulla Forner, Manuel
    International Conference on Sensor Technologies and Applications
    p. 1
    Presentation of work at congresses

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  • Direct interface for capacitive sensors based on the charge transfer method

     Gaitan Pitre, Jorge Eliécer; Gasulla Forner, Manuel; Pallas Areny, Ramon
    24th IEEE Instrumentation and Measurement Technology Conference, IMTC 2007
    p. 1-5
    Presentation of work at congresses

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  • Runtime extension of autonomous sensors using battery-capacitor storage

     Penella Lopez, Maria Teresa; Gasulla Forner, Manuel
    International Conference on Sensor Technologies and Applications
    p. 325-330
    Presentation of work at congresses

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  • A review of commercial energy harvesters for autonomous sensors

     Penella Lopez, Maria Teresa; Gasulla Forner, Manuel
    24th IEEE Instrumentation and Measurement Technology Conference, IMTC 2007
    p. 1-5
    Presentation of work at congresses

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  • Sensórica. El mundo de los sensores. Especificación Zigbee

     Casas Piedrafita, Jaime Oscar; Gasulla Forner, Manuel; Pallas Areny, Ramon
    Mundo electrónico. Edición internacional
    num. 380, p. 68-72
    Date of publication: 2006-11
    Journal article

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  • Sistema de vigilància de l'aigua i cubeta de l'estany de laminació del Campus del Baix Llobregat. Informe Final

     Gasulla Forner, Manuel; Casas Piedrafita, Jaime Oscar; Torrents Dolz, Josep Maria; Antoni, MC Verdú; Pallas Areny, Ramon
    Date: 2006-07
    Report

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  • Sensórica

     Casas Piedrafita, Jaime Oscar; Gasulla Forner, Manuel; Pallas Areny, Ramon
    Mundo electrónico
    num. 376, p. 62-64
    Date of publication: 2006-06
    Journal article

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  • Sensorica. El mundo de los sensores y sus interfaces

     Pallàs, Ramon; Casas Piedrafita, Jaime Oscar; Gasulla Forner, Manuel
    Mundo electrónico. Edición internacional
    Vol. febrero, num. 372, p. 62-64
    Date of publication: 2006-02
    Journal article

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  • Sistema de vigilància de la qualitat de l'aigua i cubeta del llac de laminació del Campus de Castelldefels

     Verdu Gonzalez, Antonio Maria; Josa March, Ramon Peñafort; Casas Piedrafita, Jaime Oscar; Gasulla Forner, Manuel; Pallàs, Ramon; Torrents Dolz, Josep Maria
    Date: 2006-01
    Report

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  • Energy Harvesting from PZT Pyroelectric Cells

     Cuadras Tomas, Angel; Gasulla Forner, Manuel; Alessio, Ghisla; Vittorio, Ferrari
    23rd IEEE Instrumentation and Measurement Technology Conference
    p. 1668-1672
    Presentation of work at congresses

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  • Access to the full text
    Noniterative algorithms for electrical resistivity imaging applied to subsurface local anomalies  Open access

     Gasulla Forner, Manuel; Pallas Areny, Ramon
    IEEE sensors journal
    Vol. 5, num. 6, p. 1421-1432
    DOI: 10.1109/JSEN.2005.858970
    Date of publication: 2005-12
    Journal article

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    In this paper, we compare five noniterative (one-step) algorithms for two-dimensional electrical resistivity imaging applied to the location of subsurface local anomalies. Here, we analyze the performance of two backprojection algorithms and three algorithms based on a least-squares criterion. These five algorithms can also be adapted for process and medical tomography. Algorithm performance is first assessed from synthetic data derived from an analytical solution. We show that least-squares-based algorithms outperform backprojection algorithms in all situations considered. One of the least-squares algorithms was further validated with experimental measurements involving spherical objects immersed into a water tank. Data were obtained using a 16-electrode linear array and a computer-controlled data-acquisition system. A reference measurement before immersing the objects into the water tank reduced errors in the reconstructed image attributable to the uncertain electrode position and the finite dimensions of the tank. Images deteriorated for deeper objects, but neglecting measurements with the smallest signal-to-noise ratio improved the results.

  • Analysis of interference effects on period-to-digital conversions

     Reverter Cubarsí, Ferran; Gasulla Forner, Manuel; Pallas Areny, Ramon
    Measurement science and technology
    Vol. 16, num. 11, p. 2261-2264
    DOI: 10.1088/0957-0233/16/11/018
    Date of publication: 2005-11
    Journal article

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  • The noise performance of a high-speed capacitive-sensor interface based on a relaxation oscillator and a fast counter

     Gasulla Forner, Manuel; Xiujun, Li; Meijer, Gerard C M
    IEEE transactions on instrumentation and measurement
    Vol. 54, num. 5, p. 1934-1940
    DOI: 10.1109/TIM.2005.853684
    Date of publication: 2005-10
    Journal article

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  • Accuracy and resolution of direct resistive sensor-to-microcontroller interfaces

     Reverter Cubarsí, Ferran; Jordana Barnils, Josep; Gasulla Forner, Manuel; Pallas Areny, Ramon
    Sensors and actuators A. Physical
    Vol. 121, p. 78-87
    DOI: 10.1016/j.sna.2005.01.010
    Date of publication: 2005-05
    Journal article

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  • Analysis of power supply interference effects on quasi-digital sensors

     Reverter Cubarsí, Ferran; Gasulla Forner, Manuel; Pallas Areny, Ramon
    Sensors and actuators A. Physical
    Vol. 119, p. 187-195
    DOI: 10.1016/j.sna.2004.08.027
    Date of publication: 2005-03
    Journal article

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