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A Temperature-Compensated Hygrometer Using Resistive Humidity Sensors  

Chung, Won-Sup (School of Electronics and Information Engineering, Cheongju University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea SC / v.43, no.6, 2006 , pp. 27-32 More about this Journal
Abstract
A temperature-compensated hygrometer has been developed using resistive humidity sensors. It consist of a sine wave generator, logarithm converters, rectifiers, and amplifiers. The hygrometer accomplishes the linearization and temperature compensation of sensor characteristics. The theory of operation is presented and experimental results are used to verify theoretical predictions. The experimental results show that the conversion sensitivity of the hygrometer is about 24.8 mV/%RH and the linearity error of the conversion characteristic is less than 17.2 % over a relative humidity range from 30 to 80 %RH. The results also show that the temperature coefficient of the output voltage is less than $10149ppm/^{\circ}C$ over a temperature range from 22 to $40^{\circ}C$.
Keywords
Resistive humidity sensor; Sine wave generator; Logarithm converter; Rectifier; Hygrometer;
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