Belt speed measurement using an optical fiber reflectometer

Details Belt speed measurement using an optical fiber reflectometer Belt speed measurement using an optical fiber reflectometer

1985-09-06

1987-08-18

LaRoche, Eugene R.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356 28, G01P 336

Patent

active

046879250

ABSTRACT:
The present invention is concerned with directly measuring belt speed by placing two high resolution single fiber optical reflectometers a known distance apart on a line parallel to the belt motion. The signal from the first reflectometer is delayed and the cross correlation function of the two signals is calculated in real time. The cross correlation function can be maximized by varying the delay. When the maximum is observed, the belt velocity may be found by dividing the reflectometer separation by the delay.

REFERENCES:
patent: 3689157 (1972-09-01), Andermo
patent: 4311383 (1982-01-01), Ohtsubo
patent: 4423923 (1984-01-01), Frazier et al.
patent: 4432599 (1984-02-01), McMahon

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