Transmission and reception device for a fiber-optical sensor sys

Details Transmission and reception device for a fiber-optical sensor sys Transmission and reception device for a fiber-optical sensor sys

1983-06-30

1986-01-14

Willis, Davis L.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250231R, 350 9615, G01D 534

Patent

active

045647550

ABSTRACT:
A transmission and reception device for a fiber-optical sensor system functioning with two wavelengths is disclosed wherein light of a first wavelength and light of a second wavelength are supplied over in-coupling fibers of a fiber-optical brancher to a fiber path of the sensor system and wherein light returning over the fiber path is supplied over an out-coupling fiber of the brancher to an evaluation means. The brancher is designed such that the greatest part of the returning light is coupled out over the out-coupling fiber. Two advantageous embodiments of such a brancher are disclosed, the one being designed in the form of a non-frequency-selective, asymmetrical quad-gate brancher and the other being designed in the form of a frequency-selective, five-gate brancher.

REFERENCES:
patent: 4244045 (1981-01-01), Nosu et al.
patent: 4317699 (1982-03-01), Winzer et al.
patent: 4341438 (1982-07-01), Seki et al.
patent: 4356396 (1982-10-01), Ruell et al.
patent: 4498731 (1985-02-01), Winzer et al.

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