Radiating and receiving arrangement for a fiber-optic sensor hav

Details Radiating and receiving arrangement for a fiber-optic sensor hav Radiating and receiving arrangement for a fiber-optic sensor hav

1991-10-18

1992-10-27

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

25022723, 385 16, H01J 4014

Patent

active

051591901

ABSTRACT:
A transmitting and receiving arrangement for fiber-optic sensors includes a first radiation source L1 having radiation which is conducted via an optical switch having a wavelength-dependent transmission or reflection filter into the fiber FA going to the sensor head. The radiation returning from the fiber is conducted via the optical switch to a first detector D1. The arrangement further includes: a second detector D2 which is permanently optically coupled into the radiation path of the first radiation source L1; and, a second radiation source L2, which is switched on alternately to the first radiation source L1 and both detectors D1, D2 are subjected to the radiation of this radiation source.

REFERENCES:
patent: 3870396 (1975-03-01), Racki et al.
patent: 4678265 (1987-07-01), Fink et al.

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