Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1976-07-07
1978-09-05
Swann, III, Glen R.
Communications: electrical
Condition responsive indicating system
Specific condition
340566, G08B 1304
Patent
active
041124200
ABSTRACT:
A piezoelectric transducer is secured to the surface of a glass sheet to translate mechanical vibrations generated in the glass sheet into an electrical signal when a crack is produced. A detection circuit is connected to the transducer to determine whether the frequency of the signal is above or below a predetermined value. If the frequency is higher than the predetermined value, a warning signal is derived to indicate a crack and therefore probably a burglary. Alternatively, the piezoelectric transducer in the transmit mode is excited electrically by an impulse to introduce an elastic wave into the glass sheet. A gate circuit is connected to the transducer to pass signals resulting from reflection of the elastic wave from discontinuities in the glass sheet which result from a crack. The reflected crack indicating signals are passed through the gate to the transducer when it is in the receive mode.
REFERENCES:
patent: 3882494 (1975-05-01), Bolger
patent: 3889250 (1975-06-01), Solomon
patent: 3946377 (1976-03-01), Zetting
patent: 4023156 (1977-05-01), Galvin
Mifune Hideo
Noguchi Toyota
Tani Kenroku
Matsushita Electric Industrial Company Limited
Swann III Glen R.
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