温度流速計における低周波特性検定装置の製作

概要

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Thermo anemometer is used for simultaneous measurements of fluctuating velocity and temperature in flow field. This instrument is composed of a constant current thermometer and a constant temperature hot wire anemometer. In using the constant current thermometer, low frequency attenuation of temperature signals is caused by a thermal inertia of the prongs. When the accurate measurements are to be made, it is necessary to compensate for the thermal lag by using of a compensating circuit. To decide the characteristic time constant of the circuit, the frequency response of the probe must be confirmed experimentally. In this paper, we made a device for checking the thermal lag of probes. The device is made smaller and lighter compared with conventional one, and it has a sufficiently large range of frequencies (10mHz〜8Hz). Due to the probes that attached to the device are inserted into and oscillated in the flow field with a linear temperature gradient, the low frequency characteristics of the probes are actually verified.
秋田工業高等専門学校の論文
2004-02-28