Piezoelectric phase locked loop circuit

Details Piezoelectric phase locked loop circuit Piezoelectric phase locked loop circuit

1987-10-20

1989-06-20

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

With reference oscillator or source

73290V, 73778, 73DIG4, 331 65, 331158, 331DIG2, 310338, 340621, G01F 2322, G01L 116, H03L 708

Patent

active

048412562

ABSTRACT:
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 structural member generate electric signals on the receiver film, which feed into a phase comparator. The other input of the phase comparator is the output signal of 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.

REFERENCES:
patent: 4056761 (1977-11-01), Jacoby et al.
patent: 4395651 (1983-07-01), Yamamoto
patent: 4450375 (1984-05-01), Siegal
patent: 4473859 (1984-09-01), Stone et al.
patent: 4499394 (1985-02-01), Koal
patent: 4538139 (1985-08-01), Clemente
patent: 4595855 (1986-06-01), Farrall

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