Piezoelectric phase locked loop circuit

Details Piezoelectric phase locked loop circuit Piezoelectric phase locked loop circuit

G - Physics

01

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340/133, 331/36

G01F 23/22 (2006.01) B06B 1/02 (2006.01) G01H 13/00 (2006.01) G01L 1/16 (2006.01) G08B 13/16 (2006.01) H03L 7/08 (2006.01)

Patent

CA 1298381

PIEZOELECTRIC PHASE LOCKED LOOP CIRCUIT Abstract of the Disclosure A structural member having a piezoelectric transmitter film and a piezoelectric receiver film adhered thereto. The transmitter film produces a vibration upon activation by a voltage controlled oscillator which forms part of a phase-lock loop circuit. The vibrations of the rigid member generate electric signals on a second receiver film, which feed into a phase comparator. The other input of the phase comparator is the voltage controlled oscillator. The phase comparator will output a dc signal proportional to the difference in phase between the two signals. When the structural member becomes damped the phase comparator will go into saturation, thereby producing a voltage which can activate an alarm signal or other device.

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