Method and apparatus for improving the dynamic range of laser detected ultrasound in attenuative materials

  • US 6,711,954 B2
  • Filed: 01/19/2001
  • Issued: 03/30/2004
  • Est. Priority Date: 01/19/2001
  • Status: Expired due to Term
First Claim
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1. A system for detecting ultrasonic displacements in a material under test, comprising:

  • a seed laser light source that provides a first laser beam having a path of propagation;

    a modulator assembly placed in said path of said first laser beam operable to provide an output pulse having a time-dependent pulse profile;

    an ultrasonic induction system which induces ultrasonic displacements in the material under test;

    a detection system which applies said output pulse of said first laser beam to the material under test in order to detect the ultrasonic displacements and generate at least one output signal; and

    a data processor to process said at least one output signal of said detection system to obtain data representative of said ultrasonic displacements.

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