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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TL;DR: In this paper, a laser beam reflected from a liquid crystal membrane embedded into the low-finess Fabri-Perot interferometer and influenced by an external electric field was studied.
Abstract: We present results of study of a laser beam reflected from a liquid crystal membrane embedded into the low-finess Fabri-Perot interferometer and influenced by an external electric field. It is shown that using interference rings one can determine the alteration of path difference in the interferometer with an accuracy of 0.02–0.03 nm.
01 Dec 1974
TL;DR: In this article, an acoustic waveguide with constant cross-section and pressure release boundaries was designed with a termination to minimize reflection of both surface and acoustic waves so that traveling surface waves and traveling acoustic waves could be generated simultaneously.
Abstract: : Studies of the effects of sinusoidal surface waves on the propagation of sound in a waveguide reveal a significant resonance effect under certain 'matching' conditions of the wavelength of the surface wave and the wavelength of the acoustical sound field. An acoustic waveguide with constant cross-section and pressure release boundaries was designed with a termination to minimize reflection of both surface and acoustic waves so that traveling surface waves and traveling acoustic waves could be generated simultaneously. With acoustic and surface waves present, the existence of predicted resonances was verified and a strong resonance was examined for comparison with theory. The predicted effects have been qualitatively and quantitatively supported.
01 May 2014
TL;DR: In this article, the authors present the physical principles of this measuring method, which is similar to that of optical interferometry, but instead of light waves, strongly damped thermal waves are used.
Abstract: By the use of thermal waves, the thickness of layers can be determined without contact and destruction. To this end, the surface of the layer is heated periodically by a modulated laser beam, and the resulting oscillation of the surface temperature is measured. The measuring principle corresponds to that of optical interferometry. Instead of light waves, however, strongly damped thermal waves are used. In this paper, we present the physical principles of this measuring method.
TL;DR: In this paper, a method for monitoring tissue surface acoustic waves with in-line digital holography without using a phase modulator was proposed, where acoustic waves directly modulate the phase and are reconstructed with knowledge of the vibration frequency.
Abstract: We evaluate a method for monitoring tissue surface acoustic waves with in-line digital holography without using a phase modulator. The acoustic waves directly modulate the phase and are reconstructed with knowledge of the vibration frequency.