Spectroanalyzer correcting for deterioration of transmissibility

Details Spectroanalyzer correcting for deterioration of transmissibility Spectroanalyzer correcting for deterioration of transmissibility

1992-12-18

1994-10-18

McGraw, Vincent P.

Optics: measuring and testing

For optical fiber or waveguide inspection

25022723, G01J 3443

Patent

active

053573340

ABSTRACT:
A spectroanalyzer accurately spectroanalyzes in spite of the deterioration of transmissibility of an optical fiber (5) by radiation, by using a light from a sample cell (1) as a measurement light which passes through the optical fiber (5). The spectroanalyzer comprises a white light source (15) for directing a monitoring light to a one end (5b) of the optical fiber (5), and a half-mirror (3) arranged in front of the other end (5a) of the optical fiber (5) for reflecting the monitoring light, which is modulated to permit the discrimination thereof from the measurement light. Accordingly, a degree of deterioration of the optical fiber (5) can be determined from the monitoring light, and the affect of the deterioration of the transmissibility can be corrected by dividing a measurement light power by a monitoring light power so that the accurate measurement of the sample cell 1 is attained in spite of the deterioration of the transmissibility of the optical fiber (5).

REFERENCES:
patent: 4376890 (1983-03-01), Engstrom et al.
patent: 4726676 (1988-02-01), Maslaney et al.
Wallace et al, "Engineering Optical Fibre Sensors For Process Control", GEC Journal of Research, vol. 2, No. 1 1984.

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