Apparatus for detecting the breaking of a glass plate

Details Apparatus for detecting the breaking of a glass plate Apparatus for detecting the breaking of a glass plate

1977-03-16

1978-05-30

Gill, James J.

Measuring and testing

Vibration

Sensing apparatus

340274R, G08B 1304

Patent

active

040916600

ABSTRACT:
The present invention is an apparatus for detecting the breaking of a glass plate. The invention uses a piezoelectric element, a signal separating circuit and a gate circuit. The piezoelectric element converts the vibrations of the glass plate into an electrical signal. The signal separation circuit separates the electrical signal into two signal signal components. The first signal component has a frequency range of less than 50 kHz. The second signal component has a frequency component higher than 100 kHz. The gate circuit produces an output signal only when both of the signal components have a signal level higher than their respective predetermined levels. By simultaneous detection of both of the first and second signal components, erroneous indication of the breaking of a glass plate can be prevented.

REFERENCES:
patent: 3521166 (1970-07-01), Grayzel

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