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Title: Method and apparatus for optical temperature measurement

Abstract

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, accuratemore » to [+-]0.1 C over an operating range of about 5 C to 90 C. 13 figs.« less

Inventors:
; ;
Issue Date:
OSTI Identifier:
7146993
Patent Number(s):
5348396 A
Application Number:
PPN: US 7-979672
Assignee:
Dept. of Energy, Washington, DC (United States) PTO; EDB-94-154631
DOE Contract Number:  
AC09-89SR18035
Resource Type:
Patent
Resource Relation:
Patent File Date: 20 Nov 1992
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION; OPTICAL PYROMETERS; DESIGN; HEAVY WATER; LIGHT TRANSMISSION; MATERIALS; MEASURING METHODS; TEMPERATURE DEPENDENCE; VISIBLE RADIATION; WATER; ELECTROMAGNETIC RADIATION; HYDROGEN COMPOUNDS; MEASURING INSTRUMENTS; OXYGEN COMPOUNDS; PYROMETERS; RADIATIONS; 440500* - Thermal Instrumentation- (1990-); 440600 - Optical Instrumentation- (1990-)

Citation Formats

O'Rourke, P.E., Livingston, R.R., and Prather, W.S. Method and apparatus for optical temperature measurement. United States: N. p., 1994. Web.
O'Rourke, P.E., Livingston, R.R., & Prather, W.S. Method and apparatus for optical temperature measurement. United States.
O'Rourke, P.E., Livingston, R.R., and Prather, W.S. Tue . "Method and apparatus for optical temperature measurement". United States.
@article{osti_7146993,
title = {Method and apparatus for optical temperature measurement},
author = {O'Rourke, P.E. and Livingston, R.R. and Prather, W.S.},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1994},
month = {9}
}