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Temperature Compensated Doppler Flowmeter for Small Diameter Pipe

The paper describes a reduction method of errors caused by changes in the sound velocity and the ultrasonic beam angle of the Doppler flowmeter. Firstly, a correcting method with sound velocity sensor is presented to show that the sound velocity error is effectively reduced. Secondly, the method is compared with the conventional Doppler method, and the various errors resulting from temperature change are discussed. It is concluded that it is possible to compensate sound velocity change in the Doppler method. The sound velocity sensor for the compensation is found to have small errors by its angle misalignment.