Acoustic holography process and apparatus using a space-limited

Details Acoustic holography process and apparatus using a space-limited Acoustic holography process and apparatus using a space-limited

1984-04-20

1986-12-30

Birmiel, Howard A.

Measuring and testing

Vibration

By mechanical waves

73603, 73625, G01N 2904

Patent

active

046319654

ABSTRACT:
The fault-containing area to be inspected is insonified by means of an ultrasonic transducer with a space-limited beam which is displaced in stepwise manner, the signals coming from the successively insonified areas being detected by several receivers, the phases and amplitudes of the signals being determined and the reconstitution of the area to be inspected performed. There is a main image of the fault and also parasitic images thereof. The number of receivers is chosen in such a way that the distance between the parasitic images and the main image exceeds the width of the area insonified by the transmitter and the reconstitution is only carried out in the insonified areas having given rise to a signal in order to eliminate the parasitic images. Application to the non-destructive inspection of mechanical parts.

REFERENCES:
patent: 4145931 (1979-03-01), Tanarell
patent: 4170142 (1979-10-01), Posakany et al.
patent: 4254662 (1981-03-01), Kuroda et al.
patent: 4319489 (1982-03-01), Yamaguchi et al.
patent: 4437176 (1984-03-01), Mack
patent: 4448076 (1984-05-01), Heelsbergen

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