Method for non-destructive testing with guided waves

Details Method for non-destructive testing with guided waves Method for non-destructive testing with guided waves

1984-08-16

1987-03-03

Kreitman, Stephen A.

Measuring and testing

Vibration

By mechanical waves

73620, G01N 2904

Patent

active

046465723

ABSTRACT:
The invention relates to a method for the interference-free testing with guided waves for faults, through cyclic production and reception of ultrasonic waves, through assessment of the received HF-signals for signal components, which derive from faults and through evaluation of the result. In order to reliably improve the capabiliy of assessing the received HF-signal over the greatest possible lengths covered and thereby to enable the testing for faults to be carried out at a high speed and a high degree of reliability, it is proposed that the received HF-signals are digitalized within the cycle and that from the digital HF-signals of several successive cycles average values are formed and these are likewise rectified with the aid of a computer and in each case are filtered and assessed with a threshold value characteristic and if required a signal analysis for faults in the testing path.

REFERENCES:
patent: 3512400 (1970-05-01), Lynnworth
patent: 3868847 (1975-03-01), Gunkel
patent: 3955405 (1976-05-01), Couture
patent: 3999422 (1976-12-01), Lehmann et al.
patent: 4041774 (1977-08-01), Morris et al.
patent: 4092868 (1978-06-01), Thompson et al.
patent: 4229796 (1980-10-01), Garrett
patent: 4271705 (1981-06-01), Crostack
patent: 4408228 (1983-10-01), Mahoney
J. Szilard, Ultrasonic Testing, Wiley, N.Y., 1982, p. 606.
Couchman et al., "Computerized Signal Processing for Detecting Cracks Under Installed Fasteners", Ultrasonics, vol. 14, No. 6 (Nov. 1976), pp. 256-262.

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