Research on the Precision Sound-Energy Flux meter

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  • 精密音流計の研究
  • セイミツオンリュウケイ ノ ケンキュウ

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Abstract

A sound-energy flux-meter applicable for accurate measurements is discussed. Its microphone head consists of two pressure microphones of nearly same characteristics; the voltage e_v proportional to the particle velocity v is obtained by time integration of the difference in voltage of the two microphone outputs. As the sound-energy flux density P is defined by the time average of p×v, the sound energy flux-meter must necessarily contain a multiplier such as the electronic wattmeter. The authors used a phase sensitive detector of new type as the multiplier, to construct a instrument with the accuracy of 2-3 %.

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