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Device for the activation of an apparatus for measuring acoustic emission by detection of background noise

  • US 4,423,634 A
  • Filed: 07/06/1981
  • Issued: 01/03/1984
  • Est. Priority Date: 07/08/1980
  • Status: Expired due to Fees
First Claim
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1. A device for measuring acoustic emission, wherein said device comprises a detection circuit for detecting the background noise collected by transducers of the measuring apparatus;

  • means for comparing the signal generated by said detection circuit with a reference voltage and producing an output signal when the comparison indicates that the background noise level has increased above a certain threshold level; and

    means for acquiring data at a first frequency, f, when no output signal is produced and when said output signal is produced acquiring data at a second frequency, F, greater than said first frequency, f.

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