Fiberized Sagnac Interferometer for Ultrasound Measurement
Laser-based ultrasonics (LBU), i.e. the generation of ultrasound by laser illumination and the measurement of ultrasonic signals by laser interferometric techniques, has many advantages for applications to nondestructive evaluation (NDE). These include non-contact generation and detection, remote placement of equipment using fiber-optics, easy scanning, absolute displacement calibration, both broad band-and narrow band signal generation, wide frequency band measurements, and applicability to curved surfaces. Both laser generation of ultrasound and the subsequent detection of the ultrasonic waves using a laser interferometry are areas of active research [1-6].
KeywordsFatigue Coherence Coupler HeNe
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