Method and means for improved optical temperature sensor

Details Method and means for improved optical temperature sensor Method and means for improved optical temperature sensor

1979-01-26

1980-05-20

Woodiel, Donald O.

Measuring and testing

Gas analysis

Moisture content or vapor pressure

340584, 356 44, G01K 100

Patent

active

042033268

ABSTRACT:
An improved optical fiber temperature sensor includes at least one optical fiber light conductor including an optical fiber core, cladding material around the core, and a jacket surrounding the core and cladding material. The core exhibits an evanescent field which extends through the cladding material into the jacket in a first selected range of optical wavelengths. Light attenuation in the conductor below a first temperature range is less than light attenuation above the temperature range. By applying light to the conductor at a frequency with the selected optical wavelength range and detecting the light passed through the conductor, an approximate temperature within the temperature range can be sensed. A more accurate temperature can be sensed by using either two optical fiber light conductors having different optical properties or by using two light frequencies with a single conductor which responds differently to the two frequencies.

REFERENCES:
patent: 3051038 (1962-08-01), Duke
patent: 4016761 (1977-04-01), Rozzell
patent: 4151747 (1979-05-01), Gottlieb et al.

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