Acoustic wave generating apparatus

Measuring and testing – Vibration – By mechanical waves

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Details

313325, 372 87, H01J 1700, H01S 400

Patent

active

056168659

ABSTRACT:
Apparatus for non-destructively inspecting for faults in or beneath the surface of structures, such as debonds or delaminations in composite materials, or cracks, broken stringers, delaminations and the like in semi-monocoque structures, includes at least one spark gap discharge device displaced from the test object which focuses an acoustic pulse onto a small local area of the object for vibrationally exciting the surface of that area. A laser Doppler camera system, also displaced from the test object directs a laser beam onto the excited area and derives from light energy reflected back from the excited area the velocity of out-of-surface displacement of, and relaxation frequencies generated by, the surface of the excited area and provides an indication of whether a fault is present in that area. Acoustic pulses and the laser beam are directed to successive local areas in synchronism according to a scanning pattern, at each of which the reflected light energy is analyzed, following which the acquired data is processed and visually displayed in a manner which clearly indicates the presence of a fault and its location and enables the operator to further analyze the data to ascertain the type and extent of the fault.

REFERENCES:
patent: 3428940 (1969-02-01), Huckabay
patent: 4161121 (1979-07-01), Zitelli et al.
patent: 4276491 (1981-06-01), Daniel
patent: 4470308 (1984-09-01), Hayakawa et al.
patent: 4651311 (1987-03-01), Owen et al.
patent: 5280724 (1994-01-01), Higo et al.

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