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Sol-gel tube crack detection apparatus and method

  • US 6,612,172 B2
  • Filed: 03/05/2001
  • Issued: 09/02/2003
  • Est. Priority Date: 03/05/2001
  • Status: Expired due to Term
First Claim
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1. A crack detection method comprising:

  • transmitting from at least one sensor to a body an electromagnetic radiation signal;

    receiving by the at least one sensor the electromagnetic radiation signal reflected by the body;

    measuring an output voltage from at least one sensor that is proportional to a signal characteristic change between the transmitted and received electromagnetic radiation signals;

    wherein the signal characteristic change results from one or more mechanisms selected from the group consisting of, microscopic motion of the body, media transition and fluid movement.

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