Dynamic response of a feedback thermoresistive electrical substitution pyranometer

R. C.S. Freire; G. S. Deep; P. C. Lobo; A. M.N. Lima; J. S. Rocha Neto; A. Oliveira

doi:10.1115/1.2888055

Dynamic response of a feedback thermoresistive electrical substitution pyranometer

R. C.S. Freire, G. S. Deep, P. C. Lobo, A. M.N. Lima, J. S. Rocha Neto, A. Oliveira

Research output: Contribution to journal › Article › peer-review

11 Scopus citations

Abstract

Calorimetric pyranometers use plane black thermal sensors which absorb solar radiation. If a thermoresistive transducer (sensor-detector combination) is used, the temperature measured is nearer the true value than for thermoelectric transducers. More importantly, the measurement of electrical power is much more accurate than the measurement of temperature. In commercial platinum (thermoresistive), thin film thermometers, the substrate produces transducer time constants an order of magnitude larger than for the best thermoelectric transducers. Use of an electronic amplifier with the thermoresistive sensor, forming one arm of a Wheatstone bridge and arranged in a negative feedback configuration, can reduce the overall response time considerably. Theoretical formulations of instrument response, taking into account the amplifier input offset voltage, are presented and the response time is estimated.

Original language	English
Pages (from-to)	126-130
Number of pages	5
Journal	Journal of Solar Energy Engineering, Transactions of the ASME
Volume	120
Issue number	2
DOIs	https://doi.org/10.1115/1.2888055
State	Published - Feb 1998
Externally published	Yes

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title = "Dynamic response of a feedback thermoresistive electrical substitution pyranometer",

abstract = "Calorimetric pyranometers use plane black thermal sensors which absorb solar radiation. If a thermoresistive transducer (sensor-detector combination) is used, the temperature measured is nearer the true value than for thermoelectric transducers. More importantly, the measurement of electrical power is much more accurate than the measurement of temperature. In commercial platinum (thermoresistive), thin film thermometers, the substrate produces transducer time constants an order of magnitude larger than for the best thermoelectric transducers. Use of an electronic amplifier with the thermoresistive sensor, forming one arm of a Wheatstone bridge and arranged in a negative feedback configuration, can reduce the overall response time considerably. Theoretical formulations of instrument response, taking into account the amplifier input offset voltage, are presented and the response time is estimated.",

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AU - Deep, G. S.

AU - Lobo, P. C.

AU - Lima, A. M.N.

AU - Rocha Neto, J. S.

AU - Oliveira, A.

PY - 1998/2

Y1 - 1998/2

N2 - Calorimetric pyranometers use plane black thermal sensors which absorb solar radiation. If a thermoresistive transducer (sensor-detector combination) is used, the temperature measured is nearer the true value than for thermoelectric transducers. More importantly, the measurement of electrical power is much more accurate than the measurement of temperature. In commercial platinum (thermoresistive), thin film thermometers, the substrate produces transducer time constants an order of magnitude larger than for the best thermoelectric transducers. Use of an electronic amplifier with the thermoresistive sensor, forming one arm of a Wheatstone bridge and arranged in a negative feedback configuration, can reduce the overall response time considerably. Theoretical formulations of instrument response, taking into account the amplifier input offset voltage, are presented and the response time is estimated.

AB - Calorimetric pyranometers use plane black thermal sensors which absorb solar radiation. If a thermoresistive transducer (sensor-detector combination) is used, the temperature measured is nearer the true value than for thermoelectric transducers. More importantly, the measurement of electrical power is much more accurate than the measurement of temperature. In commercial platinum (thermoresistive), thin film thermometers, the substrate produces transducer time constants an order of magnitude larger than for the best thermoelectric transducers. Use of an electronic amplifier with the thermoresistive sensor, forming one arm of a Wheatstone bridge and arranged in a negative feedback configuration, can reduce the overall response time considerably. Theoretical formulations of instrument response, taking into account the amplifier input offset voltage, are presented and the response time is estimated.

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Dynamic response of a feedback thermoresistive electrical substitution pyranometer

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