Variable and fixed frequency pulsed phase locked loop

Details Variable and fixed frequency pulsed phase locked loop Variable and fixed frequency pulsed phase locked loop

1997-01-24

1998-11-24

Biegel, Ronald L.

Measuring and testing

Vibration

By mechanical waves

73609, 73610, G01N 2918

Patent

active

058410325

ABSTRACT:
A measuring apparatus uses a variable and fixed frequency pulsed phase locked loop to measure the phase shift caused by a delay path to a high degree of accuracy. This accurate measurement of total phase change through greater than 360 degrees allows the apparatus to measure strain in bolts or other materials. The apparatus is able to identify features on a waveform through pattern recognition, and measure untracked phase differences with better reliability than simple thresholding techniques permit.

REFERENCES:
patent: 4363242 (1982-12-01), Heyman
patent: 4624142 (1986-11-01), Heyman
patent: 5150620 (1992-09-01), Allison
patent: 5237516 (1993-08-01), Heyman
patent: 5404753 (1995-04-01), Froggatt

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