Dynamic Response of a Feedback Thermoresistive Electrical Substitution Pyranometer

[+] Author and Article Information
R. C. S. Freire, G. S. Deep

Department of Electrical Engineering, Federal University of Paraiba, 58.109-970, Campina Grande, PB, Brazil

P. C. Lobo

Department of Mechanical Engineering, Federal School of Engineering—Itajuba 37.500-000 Itajuba, MG, Brazil

A. M. N. Lima, J. S. Rocha Neto

Department of Electrical Engineering, Federal University of Paraiba, 58.109-970, Campina Grande, PB Brazil

A. Oliveira

Department of Electrical Engineering, Federal University of Bahia, Salvador, BA, Brazil

J. Sol. Energy Eng 120(2), 126-130 (May 01, 1998) (5 pages) doi:10.1115/1.2888055 History: Received August 01, 1995; Revised December 01, 1997; Online February 14, 2008


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.

Copyright © 1998 by The American Society of Mechanical Engineers
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