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System and method for reducing the laser noise in interferometric laser ultrasound detection
System and method for reducing the laser noise in interferometric laser ultrasound detection
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机译:减少干涉激光超声检测中的激光噪声的系统和方法
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摘要
The present invention provides an optical filter assembly that reduces the phase and amplitude noise of a detection laser used to detect ultrasonic displacements. The filtered detection laser is directed to the surface of a remote target. Ultrasonic displacements at the surface scatter the filtered detection laser. Collection optics then gather phase modulated light scattered by the surface and direct the phase modulated light to an optical processor to produce a signal representative of the ultrasonic displacements with an improved SNR. Additional processors may determine the structure of the remote target.
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