G - Physics – 08 – B
Patent
G - Physics
08
B
340/128, 349/30
G08B 13/04 (2006.01) G08B 13/16 (2006.01)
Patent
CA 1064606
ABSTRACT OF THE DISCLOSURE: 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 predeter- mined value. If the frequency is higher than the predetermined value, a warning signal is derived to indicate a crack and there- fore a burglary. Alternatively, the piezoelectric transducer in the transmit mode is excited electrically by an impulse to intro- duce an elastic wave into the glass sheet. A gate circuit is connected to the transducer to pass signals resulting from reflec- tion of the elastic wave from discontinuities in the glass sheet which result from the crack. The reflected crack indicating signals are passed through the gate to the transducer when it is in the receiver mode.
258090
Mifune Hideo
Noguchi Toyota
Tani Kenroku
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