The Experts below are selected from a list of 303 Experts worldwide ranked by ideXlab platform
Alberto J. Palma - One of the best experts on this subject based on the ideXlab platform.
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design and characterization of a low Thermal drift capacitive humidity sensor by inkjet printing
Sensors and Actuators B-chemical, 2014Co-Authors: Almudena Rivadeneyra, Manuel Agudo, Jose Fernandezsalmeron, J A Lopezvillanueva, L F Capitanvallvey, Alberto J. PalmaAbstract:Abstract Small, low-cost and flexible humidity sensors were designed, fabricated by using an inkjet-printing process, and fully characterized. Based on the principles of the capacitor and the ability of a polyimide to absorb humidity, the sensor was fabricated by printing silver interdigitated electrodes on a thin polyimide film of 75 μm thickness. After modeling, the total area of the printed sensor was optimized to be 11.65 mm 2 . A relative humidity sensitivity of 4.5 fF/%RH and a Thermal Coefficient of −0.4 fF/°C were measured at 100 kHz, whereas the sensitivity and the Thermal Coefficient were 4.2 fF/%RH and −0.21 fF/°C, respectively, at 1 MHz. This latter result implies that it could not be necessary to include Thermal compensation to use this sensor depending on the required accuracy and the chosen frequency. This work shows a reliable, fast, simple and low-cost manufacturing process to make small humidity sensors with low Thermal drift and high temporal stability. These sensors could be easily integrated into inkjet-printed RFID tags for monitoring of environmental humidity in diverse applications.
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Design and characterization of a low Thermal drift capacitive humidity sensor by inkjet-printing
Sensors and Actuators B: Chemical, 2014Co-Authors: Almudena Rivadeneyra, José Fernández-salmerón, Luis Fermín Capitán-vallvey, Manuel Agudo, Juan A. López-villanueva, Alberto J. PalmaAbstract:Small, low-cost and flexible humidity sensors were designed, fabricated by using an inkjet-printing process, and fully characterized. Based on the principles of the capacitor and the ability of a polyimide to absorb humidity, the sensor was fabricated by printing silver interdigitated electrodes on a thin polyimide film of 75 μm thickness. After modeling, the total area of the printed sensor was optimized to be 11.65 mm2. A relative humidity sensitivity of 4.5 fF/%RH and a Thermal Coefficient of -0.4 fF/ C were measured at 100 kHz, whereas the sensitivity and the Thermal Coefficient were 4.2 fF/%RH and -0.21 fF/ C, respectively, at 1 MHz. This latter result implies that it could not be necessary to include Thermal compensation to use this sensor depending on the required accuracy and the chosen frequency. This work shows a reliable, fast, simple and low-cost manufacturing process to make small humidity sensors with low Thermal drift and high temporal stability. These sensors could be easily integrated into inkjet-printed RFID tags for monitoring of environmental humidity in diverse applications. © 2014 Elsevier B.V.
Almudena Rivadeneyra - One of the best experts on this subject based on the ideXlab platform.
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design and characterization of a low Thermal drift capacitive humidity sensor by inkjet printing
Sensors and Actuators B-chemical, 2014Co-Authors: Almudena Rivadeneyra, Manuel Agudo, Jose Fernandezsalmeron, J A Lopezvillanueva, L F Capitanvallvey, Alberto J. PalmaAbstract:Abstract Small, low-cost and flexible humidity sensors were designed, fabricated by using an inkjet-printing process, and fully characterized. Based on the principles of the capacitor and the ability of a polyimide to absorb humidity, the sensor was fabricated by printing silver interdigitated electrodes on a thin polyimide film of 75 μm thickness. After modeling, the total area of the printed sensor was optimized to be 11.65 mm 2 . A relative humidity sensitivity of 4.5 fF/%RH and a Thermal Coefficient of −0.4 fF/°C were measured at 100 kHz, whereas the sensitivity and the Thermal Coefficient were 4.2 fF/%RH and −0.21 fF/°C, respectively, at 1 MHz. This latter result implies that it could not be necessary to include Thermal compensation to use this sensor depending on the required accuracy and the chosen frequency. This work shows a reliable, fast, simple and low-cost manufacturing process to make small humidity sensors with low Thermal drift and high temporal stability. These sensors could be easily integrated into inkjet-printed RFID tags for monitoring of environmental humidity in diverse applications.
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Design and characterization of a low Thermal drift capacitive humidity sensor by inkjet-printing
Sensors and Actuators B: Chemical, 2014Co-Authors: Almudena Rivadeneyra, José Fernández-salmerón, Luis Fermín Capitán-vallvey, Manuel Agudo, Juan A. López-villanueva, Alberto J. PalmaAbstract:Small, low-cost and flexible humidity sensors were designed, fabricated by using an inkjet-printing process, and fully characterized. Based on the principles of the capacitor and the ability of a polyimide to absorb humidity, the sensor was fabricated by printing silver interdigitated electrodes on a thin polyimide film of 75 μm thickness. After modeling, the total area of the printed sensor was optimized to be 11.65 mm2. A relative humidity sensitivity of 4.5 fF/%RH and a Thermal Coefficient of -0.4 fF/ C were measured at 100 kHz, whereas the sensitivity and the Thermal Coefficient were 4.2 fF/%RH and -0.21 fF/ C, respectively, at 1 MHz. This latter result implies that it could not be necessary to include Thermal compensation to use this sensor depending on the required accuracy and the chosen frequency. This work shows a reliable, fast, simple and low-cost manufacturing process to make small humidity sensors with low Thermal drift and high temporal stability. These sensors could be easily integrated into inkjet-printed RFID tags for monitoring of environmental humidity in diverse applications. © 2014 Elsevier B.V.
M. A. Taghikhani - One of the best experts on this subject based on the ideXlab platform.
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Distribution Transformer's Insulation Thermal Coefficient Measurement under Unbalanced Operation
Physics and Technical Sciences, 2013Co-Authors: M. A. Taghikhani, A. AslaniAbstract:A reliable and endless supply of electricity is highly dependent on good operation of distribution transformers. A huge number of customers are directly supplied via any of the transformers. Loading of the transformers under unbalance conditions is an important factor that influences the life of their insulation. In this paper we will consider two typical 315 KVA, 20 kV distribution transformers with the same characteristics but under different operating conditions. Thermal Coefficients and remnant life of two distribution transformers are measured and show a remarkable difference between Thermal Coefficients of two transformers.
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Insulation Thermal Coefficient Measurement in Distribution Transformer under Unbalanced Operation
International journal of energy science, 2012Co-Authors: M. A. TaghikhaniAbstract:Transformers play a key role in power distribution networks. A reliable and endless supply of electricity is highly dependent on good operation of these elements. A huge number of customers are directly supplied via any of the transformers. Loading of the transformers under unbalanced conditions is an important factor that influences the life of their insulation. In this paper we will consider two typical 315 KVA, 20 kV distribution transformers with the same characteristics but under different operating conditions. One transformer supplies a three phase industrial load while another transformer supplies an urban area consisting variety of three and single phase loads and experiences unbalanced conditions that highly influence its insulation system. Thermal Coefficients and remnant life of two distribution transformers are measured and show a remarkable difference between Thermal Coefficients of two transformers.
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Thermal Coefficient measurements of typical distribution transformers operating under imbalance conditions
16th Electrical Power Distribution Conference, 2011Co-Authors: M. A. Taghikhani, M. RafieiAbstract:Transformers play a key role in power distribution networks. A reliable and endless supply of electricity is highly dependent on good operation of these elements. A huge number of customers are directly supplied via any of the transformers. Loading of transformers under imbalance conditions is an important factor that influences the life of their insulation. This paper primary refers to Thermal Coefficients measurement and life assessment of two typical distribution transformers with the same parameters but different operating conditions.
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Thermal Coefficient measurements of typical distribution transformers operating under imbalance conditions [abstract only]
16th Electrical Power Distribution Conference, 2011Co-Authors: M. A. Taghikhani, M. RafieiAbstract:Transformers play a key role in power distribution networks. A reliable and endless supply of electricity is highly dependent on good operation of these elements. A huge number of customers are directly supplied via any of the transformers. Loading of transformers under imbalance conditions is an important factor that influences the life of their insulation. This paper primary refers to Thermal Coefficients measurement and life assessment of two typical distribution transformers with the same parameters but different operating conditions.
Manuel Agudo - One of the best experts on this subject based on the ideXlab platform.
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design and characterization of a low Thermal drift capacitive humidity sensor by inkjet printing
Sensors and Actuators B-chemical, 2014Co-Authors: Almudena Rivadeneyra, Manuel Agudo, Jose Fernandezsalmeron, J A Lopezvillanueva, L F Capitanvallvey, Alberto J. PalmaAbstract:Abstract Small, low-cost and flexible humidity sensors were designed, fabricated by using an inkjet-printing process, and fully characterized. Based on the principles of the capacitor and the ability of a polyimide to absorb humidity, the sensor was fabricated by printing silver interdigitated electrodes on a thin polyimide film of 75 μm thickness. After modeling, the total area of the printed sensor was optimized to be 11.65 mm 2 . A relative humidity sensitivity of 4.5 fF/%RH and a Thermal Coefficient of −0.4 fF/°C were measured at 100 kHz, whereas the sensitivity and the Thermal Coefficient were 4.2 fF/%RH and −0.21 fF/°C, respectively, at 1 MHz. This latter result implies that it could not be necessary to include Thermal compensation to use this sensor depending on the required accuracy and the chosen frequency. This work shows a reliable, fast, simple and low-cost manufacturing process to make small humidity sensors with low Thermal drift and high temporal stability. These sensors could be easily integrated into inkjet-printed RFID tags for monitoring of environmental humidity in diverse applications.
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Design and characterization of a low Thermal drift capacitive humidity sensor by inkjet-printing
Sensors and Actuators B: Chemical, 2014Co-Authors: Almudena Rivadeneyra, José Fernández-salmerón, Luis Fermín Capitán-vallvey, Manuel Agudo, Juan A. López-villanueva, Alberto J. PalmaAbstract:Small, low-cost and flexible humidity sensors were designed, fabricated by using an inkjet-printing process, and fully characterized. Based on the principles of the capacitor and the ability of a polyimide to absorb humidity, the sensor was fabricated by printing silver interdigitated electrodes on a thin polyimide film of 75 μm thickness. After modeling, the total area of the printed sensor was optimized to be 11.65 mm2. A relative humidity sensitivity of 4.5 fF/%RH and a Thermal Coefficient of -0.4 fF/ C were measured at 100 kHz, whereas the sensitivity and the Thermal Coefficient were 4.2 fF/%RH and -0.21 fF/ C, respectively, at 1 MHz. This latter result implies that it could not be necessary to include Thermal compensation to use this sensor depending on the required accuracy and the chosen frequency. This work shows a reliable, fast, simple and low-cost manufacturing process to make small humidity sensors with low Thermal drift and high temporal stability. These sensors could be easily integrated into inkjet-printed RFID tags for monitoring of environmental humidity in diverse applications. © 2014 Elsevier B.V.
Y.h. Lo - One of the best experts on this subject based on the ideXlab platform.
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Fused InGaAs-Si avalanche photodiodes with low-noise performances
IEEE Photonics Technology Letters, 2002Co-Authors: Y. Kang, P. Mages, A.r. Clawson, P.k.l. Yu, M. Bitter, A. Pauchard, S. Hummel, Y.h. LoAbstract:A fused InGaAs-Si avalanche photodiode (APD) with a low excess noise factor of 2.3 at a gain of 20 is reported. This corresponds to a k factor of 0.02 for the silicon avalanche region. Dark current density as low as 0.04 mA/cm/sup 2/ at -5 V and 0.6 mA/cm/sup 2/ at a gain of 10 are measured; a small Thermal Coefficient, 0.09%//spl deg/C, of the breakdown voltage is observed for this APD.
