Method and apparatus for testing the response of a stress wave s

Details Method and apparatus for testing the response of a stress wave s Method and apparatus for testing the response of a stress wave s

1990-03-15

1991-04-02

Wieder, Kenneth

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Piezoelectric crystal testing

73 1DV, 324603, 324605, 324537, G01R 2922

Patent

active

050049852

ABSTRACT:
The invention relates to a method and apparatus for testing the response of a stress wave sensor to confirm that the transducer and amplifier are functioning satisfactorily.
A pulser is connected to the stress wave sensor at a point between the transducer and the amplifier. The pulser supplies a first and a second electrical pulse in series to the stress wave sensor. The first electrical pulse has a large amplitude such that it causes an operative transducer to oscillate and produce an additional electrical pulse. The first electrical pulse and the additional electrical pulse are supplied to the amplifier. An operative amplifier amplifies the first electrical pulse and any additional pulse to give an output signal, the output signal indicates if either the transducer or amplifier are not operating satisfactorily, the lack of an output signal indicates the amplifier is inoperative.
The second electrical pulse has a predetermined amplitude and is supplied to the amplifier, and is amplified by an operative amplifier to give a measure of the gain of the amplifier.

REFERENCES:
patent: 4267505 (1981-05-01), Biglin
patent: 4284946 (1981-03-01), Sharron
patent: 4559826 (1985-12-01), Nelson
patent: 4609994 (1984-01-01), Bassim et al.
patent: 4624127 (1986-11-01), Narushima et al.
patent: 4785232 (1988-11-01), Ballato et al.
patent: 4816743 (1989-03-01), Harms et al.
"Acoustic Emission", by Jack Spanner, 12/1973, pp. 240-245.

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