Ultrasound single-element non-contacting inspection system
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United States of America Patent
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Aug 28, 2007
Grant Date -
N/A
app pub date -
May 24, 2004
filing date -
May 24, 2004
priority date (Note) -
Expired
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Abstract
A laser ultrasonic inspection apparatus and method which enables remote sensing of thickness, hardness, temperature and/or internal defect detection is disclosed. A laser generator impinges a workpiece with light for generating a thermo-elastic acoustic reaction in a workpiece. A probe laser impinges the workpiece with an annularly-shaped probe light for interaction with the acoustic signal in the workpiece resulting in a modulated return beam. A photodetector having a sensitive region for detecting an annularly-shaped fringe pattern generated by an interaction of a reference signal and with the modulated return beam at said sensitive region.
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