Output dynamic range of radiometers based on thermoresistive sensors

Nascimento, Vanuza Marques Do; Silva, Thais L. V. N.; Martins, Viviane S. G.; Lobo, Petrov C.; Freire, Raimundo C. S.

doi:10.1109/i2mtc.2014.6860949

Cited by 2 publications

(1 citation statement)

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“…One sensor is painted in black and is used mainly for sensing the incident radiation, while the other one is painted in white and serves to compensate the influence of the ambient temperature. Similarly, other constant temperature architectures, like the PWM [ 10 ] and the Sigma-Delta [ 7 , 11 ], also employ two sensors.…”

Section: Introductionmentioning

confidence: 99%

Architecture of an Electrical Equivalence Pyranometer with Temperature Difference Analog Control

Dantas

Segundo

Catunda

et al. 2022

Sensors

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In this paper, an architecture of an electrical equivalence pyranometer with analog control of the temperature difference is presented. The classical electrical equivalence pyranometer employs a Wheatstone bridge with a feedback amplifier to keep the sensor operating at a constant temperature to estimate the incident radiation through the sensor thermal balance employing the electrical equivalence principal. However, this architecture presents limitations under ambient temperature variation, such as sensitivity variation. To overcome those limitations, we propose an architecture that controls the temperature difference between the sensor and ambient via an analog compensating circuit. Analytical results show an improvement near five times in sensitivity over the ambient temperature span and 76.3% increase of useful output voltage. A prototype was developed and validated with a commercial pyranometer, showing a high agreement on the measurement results. It is verified that the use of temperature difference, rather than constant temperature, significantly reduces the effect of ambient temperature variation.

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Section: Introductionmentioning

confidence: 99%