Convertor apparatus for accurate and consistent non-destructive

Details Convertor apparatus for accurate and consistent non-destructive Convertor apparatus for accurate and consistent non-destructive

1983-02-16

1985-01-22

Birmiel, Howard A.

Measuring and testing

Vibration

By mechanical waves

73584, 73588, 310336, G01N 2900

Patent

active

044944101

ABSTRACT:
The invention relates to a convertor for converting electrical vibrations into mechanical vibrations for non-destructive testing of objects, in particular bonded joints between two or more sheets or between sheets and a honey comb structure. Said convertor comprises a polycrystalline, piezo-electric disc, with mutually insulated electrodes on both head faces. The disc is secured in a supporting element by a suspension with a resilient member pressing centrally through a metal pin against the internal head face of the disc. The supporting element is movably installed into a holder such that the supporting element can be moved from a retracted position in the direction of the extended position until such a position is reached that the piezo-electrical disc is pressured against the object to be tested with a predetermined force.
The invention also relates to a method for using the convertor.

REFERENCES:
patent: 3205702 (1965-09-01), Joy
patent: 3798961 (1974-03-01), Flambard et al.
patent: 3883841 (1975-05-01), Norel et al.
patent: 4242744 (1980-12-01), Rottmar

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