Minimization of systematic errors of the sonic thermometer due to signal time delays and temperature changes in the design
A.Ya. Bogushevich
Institute of Monitoring of Climatic and Ecological Systems of the Siberian Branch of the Russian Academy of Sciences, Tomsk, Russia
Keywords: sonic anemometer-thermometer, ultrasonic weather station, air temperature, measurement error
Abstract
The joint influence on the systematic error of sonic temperature measurements of the unaccounted time delay of signal transmission between sound transmitter-receiver pairs and temperature changes in the distances between them is considered. Analytical relations for estimating the considered error and the results of its calculations are given. The method of calibration of such devices in a climate chamber with the use of reference measuring instruments is described, which allows one to reduce this influence by more than an order of magnitude in the range of measured temperatures from -70 to + 50 °C.
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