Correlating fiber optical measuring device

Details Correlating fiber optical measuring device Correlating fiber optical measuring device

1981-09-23

1984-02-07

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250231R, G01J 334, G01D 534

Patent

active

044305656

ABSTRACT:
The invention relates to a fiber optical measuring device for measuring physical and/or chemical parameters. The device comprises a transducer unit and an evaluating unit, connected via at least one light conductor. One or more light sources in the evaluating unit, via said at least one light conductor, illuminate one or more optical filters located in the transducer unit which filter(s) is (are) sensitive to the parameter being measured. An optical detector arrangement in the evaluating unit analyzes the light emanating from the transducer unit. The detector arrangement consists of one or more photo-detectors, arranged to sense the light emitted from the transducer unit after this light has been affected by at least one filter belonging to the detector arrangement. The spectral properties of the detector filter(s) are controlled so that the detector arrangement is able to measure the correlation between the spectra of the transducer and detector filters. The correlation values are used as a measure of the condition of the transducer filter and thus of the parameter(s) being measured.

REFERENCES:
patent: 4249076 (1981-02-01), Bergstrom et al.

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