Thermal measuring and testing – Temperature measurement – Nonelectrical – nonmagnetic – or nonmechanical temperature...
Patent
1994-12-14
2000-03-07
Knight, Anthony
Thermal measuring and testing
Temperature measurement
Nonelectrical, nonmagnetic, or nonmechanical temperature...
G01K 1100
Patent
active
060331089
ABSTRACT:
An apparatus and method for sensing temperature within a broad temperature range, includes a fiber optic having an etalon at one end for reflecting light supplied at an opposite end by a pair of light sources operating at different wavelengths. The light sources are either applied to the optical fiber at different times for discriminating between the wavelengths and producing a temperature signal based on the two wavelengths, or the light is simultaneously applied to the optical fiber from both sources and thereafter divided into its component wavelengths before reflected and reference light detectors detect light signals at the different wavelengths. Known etalon/optical fiber based temperature sensors having a usual maximum temperature range of 500.degree. C. are thus modified to increase their range to as much as double this range.
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Berthold John W.
Jeffers Larry A.
Beres John L.
Edwards Robert J.
Kalka Daniel S.
Knight Anthony
McDermott Technology Inc.
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