PIEZOELECTRIC SIGNAL TRANSDUCER AND ALARM SIGNAL TRANSMITTER BASED ON PIEZOELECTRIC SIGNAL TRANSDUCER Russian patent published in 2001 - IPC

FIELD: guard systems. SUBSTANCE: the piezoelectric signal transducer is designed to produce a train of square pulses with a variable relative pulse duration, depending on the mechanical effect on the guarded object. The alarm signal transmitter is designed to detect the mechanical effect on the guarded object and convert the signal of mechanical action to an alarm signal, it has a piezoelectric transducer comprising a piezoelectric element cut in the feedback circuit of the pulse shaping unit. EFFECT: simplified design of the transducer and transmitter and enhanced sensitivity of the alarm signal transmitter; selectivity of transmitter in case of a minimum mechanical effect on the guarded object. 9 cl, 10 dwg