日本音響学会誌
Online ISSN : 2432-2040
Print ISSN : 0369-4232
熱電対による音響の場のエネルギの測定
川村 雅恭
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1958 年 14 巻 1 号 p. 18-24

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This paper deals with a qualitative consideration of experimental results of the evaporated thermo-couple used as an intensity detector in a sound field. This special thermo-couple is made of evaporating Bi and Sb or their alloys on the mica or collodium film in a vacuum. It has been found that the electro motive force generated in a sound field is a direct current E. M. F. proportional to the square of the sound pressure. From this fact, the possibility of using the special thermo-couple as a measuring instrument of sound intensity was established. The frequency range of the thermo-couple in this experiment is from 200 to 5000 c/s. This instrument does not indicate the alternating electro motive force induced by the sound wave, so the time constant of the thermo-couple is not a serious problem. Further-more the resistance of the thermo-couple must be a stable one.

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© 1958 一般社団法人 日本音響学会
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