Method and apparatus for optical temperature measurement
A temperature probe and a method for using said probe for temperature measurements based on changes in light absorption by the probe are disclosed. The probe comprises a first and a second optical fiber that carry light to and from the probe, and a temperature sensor material, the absorbance of which changes with temperature, through which the light is directed. Light is directed through the first optical fiber, passes through the temperature sensor material, and is transmitted by a second optical fiber from the material to a detector. Temperature-dependent and temperature-independent factors are derived from measurements of the transmitted light intensity. For each sensor material, the temperature T is a function of the ratio, R, of these factors. The temperature function f(R) is found by applying standard data analysis techniques to plots of T versus R at a series of known temperatures. For a sensor having a known temperature function f(R) and known characteristic and temperature-dependent factors, the temperature can be computed from a measurement of R. Suitable sensor materials include neodymium-doped borosilicate glass, accurate to [+-]0.5 C over an operating temperature range of about [minus]196 C to 400 C; and a mixture of D[sub 2]O and H[sub 2]O, accurate to [+-]0.1 C over an operating range of about 5 C to 90 C. 13 figs.
- DOE Contract Number:
- AC09-89SR18035
- Assignee:
- Dept. of Energy, Washington, DC (United States)
- Patent Number(s):
- US 5348396; A
- Application Number:
- PPN: US 7-979672
- OSTI ID:
- 7146993
- Resource Relation:
- Patent File Date: 20 Nov 1992
- Country of Publication:
- United States
- Language:
- English
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OPTICAL PYROMETERS
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HEAVY WATER
LIGHT TRANSMISSION
MATERIALS
MEASURING METHODS
TEMPERATURE DEPENDENCE
VISIBLE RADIATION
WATER
ELECTROMAGNETIC RADIATION
HYDROGEN COMPOUNDS
MEASURING INSTRUMENTS
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440500* - Thermal Instrumentation- (1990-)
440600 - Optical Instrumentation- (1990-)