A thermistor leaf thermometer |
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Authors: | Linacre E T Harris W J |
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Institution: | Commonwealth Scientific and Industrial Research Organization, Division of Irrigation Research, Griffith, N.S.W., 2680, Australia. |
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Abstract: | An instrument is described which allows measurements of leaf temperature within about 0.3 C. It consists of a special thermistor probe, a small circuit box, and a standard ammeter. The circuit box can easily be fixed to the meter and contains a battery, which passes 0.3 milliampere through the thermistor, and also contains an integrated circuit amplifier, so that the meter reads 20 C full scale deflection, with ranges adjustable in 10 C steps. Calibration experiments show the superiority of the thermistor leaf thermometer to a thermocouple pressed onto a rubber surface with a resilience resembling that of a leaf. |
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