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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: This paper presents a meta-anatomy of the response of the immune system to various types of attacks, and some of the mechanisms used to attack these immune systems have been described.
Abstract: Rights © 1987 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.” IEEE, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, 1987, Volume: 34, Issue: 4, page(s): 472477 Type article File Information ITUFFC34-4.pdf
54 citations
53 citations
53 citations
TL;DR: A fiber optic sensor suitable for noncontact detection of ultrasonic waves based on the fiber optic Sagnac interferometer, which has a path-matched configuration and does not require active stabilization.
Abstract: This paper describes a fiber optic sensor suitable for noncontact detection of ultrasonic waves. This sensor is based on the fiber optic Sagnac interferometer, which has a path-matched configuration and does not require active stabilization. Quadrature phase bias between two interfering laser beams in the Sagnac loop is applied by controlling the birefringence using a fiber polarization controller. A stable quadrature phase bias can be confirmed by observing the interferometer output according to the change of phase bias. Additional signal processing is not needed for the detection of ultrasonic waves using the Sagnac interferometer. Ultrasonic oscillations produced by conventional ultrasonic piezoelectric transducers were successfully detected, and the performance of this interferometer was investigated by a power spectrum analysis of the output signal. Based on the validation of the fiber optic Sagnac interferometer, noncontact detection of laser-generated surface waves was performed. The configured Sagnac interferometer is very effective for the detection of small displacement with high frequency, such as ultrasonic waves used in conventional nondestructive testing (NDT).
53 citations
52 citations