Method of and apparatus for detecting damage to a frangible obje

Details Method of and apparatus for detecting damage to a frangible obje Method of and apparatus for detecting damage to a frangible obje

1977-02-11

1978-02-07

Swann, III, Glen R.

Communications: electrical

Systems

Call station

340261, G08B 1304

Patent

active

040729362

ABSTRACT:
Damage to a frangible article, particularly a glass window is detected by sensors responsive to oscillations in different frequency bands. Only when all the sensors are simultaneously responsive is an alarm signal, denotive of damage to the article, developed. Piezo-ceramic transducers respond to frequencies within the range of 30 kHz to 1 MHz. The sensors are connected in parallel with inductors to provide resonant amplification of the voltage developed. The resultant signals are amplified and applied to an AND gate yielding the required output signal.

REFERENCES:
patent: 3618062 (1971-11-01), Ott
patent: 3863250 (1975-01-01), McCluskey, Jr.
patent: 3889250 (1975-06-01), Solomon

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