受信水晶板を用いた液体用超音波干渉計

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  • On an Ultrasonic Interferometer for Liquids with a Receiving Quartz
  • ジュシン スイショウバン オ モチイタ エキタイヨウ チョウオンパ カンショウケイ

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An ultrasonic interferometer using a transmitting and a receiving quartz plate was constructed. The ultrasonic velocities in liquids were obtained by measuring the periodic changes of voltage induced in the receiving quartz which was set up instead of a reflecting plate in this apparatus. This method enables the observation of pure acoustical quantities. The output was fed to the transmitting quartz through the matching network loosely coupled to the plate circuit of a Pierce oscillator circuit with a control quartz. Moving the transmitting quartz against the receiving quartz, the acoustic load on the transmitting quartz varies; this results in the variation of its equivalent mechanical impedance. In this case, the variations of the acoustic output form the transmitting quartz are known by the readings of voltages induced in the receiving quartz. The voltage is read on a galvanometer through a silicon-tungsten rectifier. From intervals of some maximum deflections of the galvanometer, the wavelength is obtained. The frequency is 2. 3920 m. c. in the case of no load, and the deviations from that frequency caused by connecting the acoustic loads are always smaller than 100 cycles/sec. During above stated measurements, the frequency fluctuations caused by variations of distance between transmitting and receiving quartz plates are hardly recognized. The experimental values of ultrasonic velocities in distilled water obtained in this research are as follows: 1481 m/sec. at 19. 2℃, 1490 m/sec. at 23. 0℃.

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