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A Diode Sensor for Air Temperature and Humidity Profile Measurements

Author(s): Josefina Argete

Journal: Science Diliman
ISSN 0115-7809

Volume: 4;
Issue: 2;
Start page: 57;
Date: 1992;
Original page

Keywords: Germanium diodes | Diode Sensor | air temperature | humidity profile measurements

An instrument package was developed for measuring four-level dry-bulb and wet-bulb temperature profiles. Germanium diodes (1N270) incorporated into a constant current circuit were used as sensing heads. Laboratory calibrations were referenced against a factory-calibrated thermistor with an accuracy of 0.25 deg C. The diodes showed a linear response over normal atmospheric temperature range and a sensitivity of about 1.8 mV /deg C. Field performance gave the following spread of values among the four psychrometers: 0.15 deg C for Td .05 deg C for Tw and 0.15 hPa for vapor pressure.The diode psychrometers allow air temperature and humidity profile analyses over the earth-atmosphere interface wherein accuracy, flexibility in field use, and remote reading are required.
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