Study on The Blower Type Pest Control Machinery Report (VI)

On Basic Character of the Thermister for the Anemometer

Abstract

We studied on basic character of the thermister for the anemometer, because of necessity to measure the wind distribution of the jet flow from the blower.
On the test result, the voltage at the both ends of OBS-10 bead type thermister was in proportion to the square root of wind velocity. And this thermister indicated most sensibility for moving wind when electric current was used in 3-4mA. and as wind velocity became smaller, the less current used, the higher sensibility appeared.
Then we made the anemometer with direct bridge circuit that suit to this character. This anemometer could measure more sensibly under 3m/s wind velocity, and could measure the wind velocity distribution of jet flow from a duster's blower.
With the same thermister we made another anemometer having temperature compensation circuit, zero point adjusting circuit and more linear relation between wind velocity and its indication too. Our purpose could be almost perfected, but bead type thermister could not be used over 30m/s wind velocity, because of its weak supporter.