Optical fibre thermometer

Details Optical fibre thermometer Optical fibre thermometer

1984-10-16

1986-03-11

Frankfort, Charles

Thermal measuring and testing

Temperature measurement

In spaced noncontact relationship to specimen

374131, 374161, G01J 558

Patent

active

045752591

ABSTRACT:
An optical fiber temperature thermometer uses a thermochromic substance having optical absorption peaks which vary with temperature within a first waveband, and having substantially constant absorption with temperature in a second waveband. The radiation employed is in a wide band to include the first and second wavebands, and the radiation, reflected and attenuated as a result of the passage through the thermochromic substance, is split into two selected beams and filtered in narrow band pass filters for the first and second wavebands, to supply optical signals to respective detectors whose outputs are divided to produce a ratio signal representative of the temperature. The sensor is sufficiently compact for biomedical use, and, being unaffected by electromagnetic fields, is useful in regions of high tension or in microwave heating.

REFERENCES:
patent: 4016761 (1977-04-01), Rozzell et al.
patent: 4149852 (1979-04-01), Tiru et al.
patent: 4176552 (1979-12-01), Hammer
patent: 4261651 (1981-04-01), Gray et al.
patent: 4278349 (1981-07-01), Sander
patent: 4362645 (1982-12-01), Hof et al.
patent: 4367040 (1983-01-01), Goto
patent: 4376890 (1983-03-01), Engstrom et al.
patent: 4448547 (1984-05-01), Wickersheim

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