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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17 Jun 2003
TL;DR: In this paper, some features of acousto-optical methods as applied to measurement technology are considered, where the intensity of diffraction maxima is modulated at light beam diameter comparable to the acoustic wavelength.
Abstract: Some features of acousto-optical methods as applied to measurement technology are considered. The intensity of diffraction maxima are modulated at light beam diameter comparable to the acoustic wavelength. Such phenomena take place for light beam diffraction at surface ultrasonic waves (Rayleigh waves), capillary waves on a surface of a fluid as well. The signal modulation frequencies depend not only on the wave frequency, but also on the studied medium velocity. Signal modulation phases depend on wavelength. Therefore such methods may be useful for various problems of measurement technology, as the optical scheme of the measuring device can be very simple: laser -- medium under study (in which one of the indicated waves is excited) -- photodetector.
1 citations
Posted Content•
TL;DR: In this paper, it was shown that under the definite regime of interaction of the acoustic waves with low-temperature, partially ionized plasma, it is possible to change the intensity of some spectral lines of atomic argon.
Abstract: It is shown that under the definite regime of interaction of the acoustic waves with low-temperature, partially ionized plasma it is possible to change the intensity of some spectral lines of atomic argon. It is shown also, that the dependence of the intensities of these spectral lines on the intensity of the acoustic wave has a hysteresis behavior.
1 citations
Patent•
19 Jun 2002
TL;DR: In this article, a stable scanning or non-scanning Fabry-Perot interferometer comprising two plane mirrors (1, 2) arranged parallel to one another with an optical distance (nL) between the optical surfaces (3, 4) of the mirrors was described.
Abstract: of EP1376080The invention relates to a stable scanning or non-scanning Fabry-Perot interferometer comprising two plane mirrors (1, 2) arranged parallel to one another with an optical distance (nL) between the optical surfaces (3, 4) of the mirrors (1, 2), the interferometer radiating an output light signal (6) in response to a light input signal (5) applied parallel to the optical axis (7) of the interferometer. The interferometer is stabilised by providing means for passing at least one reference light beam (8a, 8b or 8c) through the interferometer, the reference light beam being inclined at an angle ([theta]) to the optical axis (7) of the interferometer. The invention also relates to a method for stabilising the interferometer.
1 citations
TL;DR: In this paper, the sound velocity in a cylindrical plasma produced by a high frequency discharge is measured by an interferometer system, and it is shown that the acoustic wave guide effect does exist in a neutral gas and in a plasma.
Abstract: The sound velocity in a cylindrical plasma produced by a high frequency discharge is measured by an interferometer system. The result shows that the acoustic wave guide effect does exist in a neutral gas and in a plasma. It is found that the wave propagates in the mode m=2 in a rigid boundary above the cut-off frequency fc and in the mode m=0 below fc. Because the mode m=0 is identical to a plane wave, the sound velocity in free space can be evaluated exactly. In the mode m=2, the sound velocity approaches the free space value, when the frequency increases sufficiently.
1 citations