A New Measuring Method for Underwater Displacement, Utilizing Sound Signal. Experimental Relationship between Sound Frequency and Displacement.

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  • 水中における音響信号を利用した変位の精密測定　音響周波数と変位との実験
  • スイチュウ ニ オケル オンキョウ シンゴウ オ リヨウシタ ヘンイ ノ セイ

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Abstract

This paper deals with a newly developed underwater displacement sensor utilizing the acoustic resonant frequency of water in a submerged pipe. Both ends of the pipe are closed. A speaker to generate sound is fixed on the end of the pipe with a reflector at the other end. Piezoelectric ceramic is used as a speaker. A sweep signal is radiated from the speaker to the water column in the pipe. The sound pressure takes the largest value at the resonant frequency. The displacement of the reflector which is inserted from another end of the pipe by a plunger, corresponds to the length of the water column. The displacement of the reflector has good correspondence to the resonant frequency of the water column. It is found from the experiment that it is possible to accurately measure underwater displacement, using this sensor.

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