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Plant Physiology 46:190-193 (1970)
© 1970 American Society of Plant Biologists

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Articles

A Thermistor Leaf Thermometer

E. T. Linacre1 and W. J. Harris

a Commonwealth Scientific and Industrial Research Organization, Division of Irrigation Research, Griffith, N.S.W., 2680, Australia

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.

1 Now Associate Professor of Climatology, School of Earth Sciences, Macquarie University, Sydney, N.S.W., 2113, Australia.






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Copyright © 1970 by the American Society of Plant Biologists