Adaptive Heterodyne Interferometer for Ultrasonic NDE Pouet, B. Ing, R. Krishnaswamy, S. Royer, D. 2018-02-14T08:35:39.000 2020-06-30T06:49:32Z 2020-06-30T06:49:32Z Thu Jan 01 00:00:00 UTC 1998 1998
dc.description.abstract <p>For NDE applications, the remote generation and detection of ultrasound by laser present many advantages over traditional piezo-electric based methods. They provide nonintrusive, point generation and detection with a large frequency bandwidth. For example, it can be used on surfaces of complex geometry and elevated temperature on a production line. Ultrasound generation using absorption of pulse laser energy is well known. Various interferometers for optical detection of ultrasound have been described in the literature [1]. In order for the interferometer to be attractive for NDE applications, the interferometer must also be able to operate, without loss of sensitivity, in an environment where large amplitude low frequency vibrations are generally present. Furthermore, the interferometer must be able to achieve a good sensitivity on rough surfaces. The laser light reflected on a rough surface is characterized by speckles. The random intensity and phase distributions of these speckles require the use of interferometer with large étendue. In addition, the possibility of using an optical fiber in the path of the probe beam without loss in the interferometer sensitivity is highly desirable for applications where access to the specimen is limited. The confocal Fabry-Pérot interferometer [1] has been shown to be well adapted for NDE applications. Unfortunately, since the elimination of the optical side-bands is based on the optical filtering action of the confocal cavity, it is sensitive mostly to high frequencies for a reasonable cavity size, typically above 1MHz for a 1 meter cavity length.</p>
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dc.identifier archive/
dc.identifier.articleid 3843
dc.identifier.contextkey 5810929
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath qnde/1998/allcontent/251
dc.language.iso en
dc.source.bitstream archive/|||Fri Jan 14 22:57:20 UTC 2022
dc.source.uri 10.1007/978-1-4615-5339-7_251
dc.subject.disciplines Process Control and Systems
dc.title Adaptive Heterodyne Interferometer for Ultrasonic NDE
dc.type event
dc.type.genre article
dspace.entity.type Publication
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