Fiber optical temperature measuring apparatus

Details Fiber optical temperature measuring apparatus Fiber optical temperature measuring apparatus

1985-04-25

1987-08-25

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250205, 374161, 374162, G01K 1100, G01D 534

Patent

active

046894837

ABSTRACT:
A fiber optical measuring apparatus in accordance with the invention utilizes the thermal shift of the absorption edge in doped insulators such as colored glass filters. A radiant energy source is operable in a first, normal mode for temperature measurement, and is selectively operable in a second mode for calibration purposes. In the first mode, the source emits light at a wavelength extending into the absorption edge, and in the second mode emits light at a wavelength removed from the absorption edge and at which transmission of the light through the sensing element is not affected by temperature shift. A reference photodetector coupled to the radiant energy source to receive light directly therefrom provides a correcting signal to correct for variations in source intensity. Means are provided for compensation for variations in the temperature of the source.

REFERENCES:
patent: 4136566 (1979-01-01), Christensen
patent: 4270050 (1981-05-01), Brogardh
patent: 4278349 (1981-07-01), Sander
patent: 4281245 (1981-07-01), Brogardh et al.
patent: 4288159 (1981-09-01), Newman

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