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Optical stress generator and detector

  • US 20010028460A1
  • Filed: 05/03/2001
  • Published: 10/11/2001
  • Est. Priority Date: 01/23/1996
  • Status: Active Grant
First Claim
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1. A method for characterizing a structure, comprising the steps of:

  • applying first electromagnetic radiation to the structure for creating propagating stress pulses within the structure;

    applying second electromagnetic radiation to the structure at a plurality of different incidence angles so as to intercept the propagating stress pulses;

    sensing a reflection or transmission of the second electromagnetic radiation from the structure at the plurality of incidence angles;

    associating a change in the reflection of the second electromagnetic radiation over time with a value of an optical characteristic of the structure, and determining in accordance with the value of the optical characteristic the velocities of the propagating stress pulses; and

    optionally determining the elastic modulus of the structure in accordance with the determined velocities of the propagating stress pulses.

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