Ultrasonic non-destructive evaluation technique for structures of complex geometry
AssigneeRockwell International Corporation
InventorsRobert B. Thompson, Carmine F. Vasile, Roger B. Houston
Life of this patent
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Abstract
Disclosed is a method for evaluating the structural integrity of an object, including the steps of generating a lowest order horizontal shear wave in the object, detecting the wave after it has propagated through the object, time gating the detected signal to reject nonuseful portions, Fourier transforming the time response of the detected signal into a frequency dependent response, and predicting the structural integrity of the object from the characteristics of the frequency response.
Claims9
A method of evaluating the structural integrity of an object, comprising the steps of:
- (a) generating an acoustic signal in the object;
- (b) detecting the acoustic signal after it has propagated in the object;
- (c) transforming the response in time of the detected signal into a frequency dependent response;
- (d) comparing the passband of the frequency response, treating the object as an acoustic bandpass filter, to the passband for a standard object of known structural integrity;
- and
- (e) predicting the structural integrity of the object from the modified passband of the object.
A method of evaluating the structural integrity of an object, comprising the steps of:
- (a) generating a lowest order horizontal shear wave in the object;
- (b) detecting the wave after it has propagated through the object;
- (c) time gating the detected signal to reject nonuseful portions;
- (d) Fourier transforming the time response of the detected signal into a frequency dependent response;
- (e) comparing the passband of the frequency response, treating the object as an acoustic bandpass filter, to the passband for a standard object of known structural integrity;
- and
- (f) predicting the structural integrity of the object from the modified passband of the object.
Dependencies are inferred from the claim text.