Pulsed phase locked loop strain monitor

Details Pulsed phase locked loop strain monitor Pulsed phase locked loop strain monitor

1993-08-12

1995-04-11

Raevis, Robert

Measuring and testing

Instrument proving or calibrating

Volume of flow, speed of flow, volume rate of flow, or mass...

73597, F16B 1302

Patent

active

054047439

ABSTRACT:
A pulse phase locked loop system according to the present invention is described. A frequency generator such as a voltage controlled oscillator (VCO) generates an output signal and a reference signal having a frequency equal to that of the output signal. A transmitting gate gates the output frequency signal and this gated signal drives a transmitting transducer which transmits an acoustic wave through a material. A sample/hold samples a signal indicative of the transmitted wave which is received by a receiving transducer. Divide-by-n counters control these gating and sampling functions in response to the reference signal of the frequency generator. Specifically, the output signal is gated at a rate of F/h, wherein F is the frequency of the output signal and h is an integer; and the received signal is sampled at a delay of F
wherein n is an integer.

REFERENCES:
patent: 4177731 (1978-10-01), Heyman
patent: 4297649 (1981-10-01), Sbuelz et al.
patent: 4363242 (1982-12-01), Heyman
patent: 4752917 (1988-06-01), Dechape
patent: 4754186 (1988-06-01), Choperena et al.
patent: 4833460 (1989-06-01), Heyman et al.
patent: 4958520 (1990-09-01), Trommler et al.
patent: 4975930 (1990-12-01), Shaw
patent: 5150620 (1992-09-01), Allison

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