Topic
Acoustic interferometer
About: Acoustic interferometer is a research topic. Over the lifetime, 1493 publications have been published within this topic receiving 19355 citations.
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01 Jan 1978
3 citations
3 citations
01 Jan 1992
TL;DR: In this article, it is shown that disturbances in shock and expansion tubes can be modelled as lateral acoustic waves and the ratio of sound speed across the driver-test gas interface is shown to govern the quantity of noise in the test gas.
Abstract: It is shown that disturbances in shock and expansion tubes can be modelled as lateral acoustic waves. The ratio of sound speed across the driver-test gas interface is shown to govern the quantity of noise in the test gas. Frequency “focusing” which is fundamental to centred unsteady expansions is discussed and displayed in centreline pitot pressure measurements.
3 citations
3 citations
TL;DR: In this article, the damping and velocity of Rayleigh surface acoustic waves (SAW) were measured in liquid 4 He using a reflection plate 1.5 mm above the SAW device which reflected the emission waves.
Abstract: Damping and velocity of Rayleigh surface acoustic waves (SAW) were measured in liquid 4 He . A Rayleigh-SAW propagates along the substrate surface by emitting compressional waves into the liquid and thus the damping of the Rayleigh-SAW is determined by the acoustic impedance of the surrounding liquid 4 He . Temperature dependence agreed well with the reported values of the impedance and the superfluid transition in 4 He was clearly seen. We also set up a reflection plate 1.5 mm above the SAW device which reflected the emission waves. They were converted back into the SAW and used to measure the velocity and damping of ultrasound in liquid 4 He separately.
3 citations