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Acoustic emission linear pulse holography

  • US 4,531,411 A
  • Filed: 10/25/1983
  • Issued: 07/30/1985
  • Est. Priority Date: 10/25/1983
  • Status: Expired due to Fees
First Claim
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1. A method for monitoring growing defects in an inspection zone within a structure, comprising the following steps:

  • mounting a plurality of discrete sensors, including a reference sensor, at fixed locations in a preselected array along a surface of the structure adjacent to the inspection zone;

    detecting the acoustic waves emitted from a growing defect in the inspection zone as output pulses generated at each sensor;

    determining the phase components of the output pulse generated at each sensor at a selected time as a function of the pulse transmission time between the sensor and the reference sensor and as a function of a synthetic frequency selected from the pulse bandwidth; and

    combining the resulting cumulative phase information into a synthetic hologram of the defect.

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