DISTRIBUTED OPTICAL TEMPERATURE SENSOR

DISTRIBUTED OPTICAL TEMPERATURE SENSOR

Methods and apparatus are disclosed for detecting a rate of change of temperature in the environment around a sensing optical fibre at a position along the fibre, in which a time varying coherent Rayleigh backscatter interference signal is detected using probe light backscattered within the sensing...

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Hauptverfasser: YAU, Alan, HANDEREK, Vincent
Format: Patent
Sprache:eng ; fre ; ger
Schlagworte:
MEASURING
MEASURING QUANTITY OF HEAT
MEASURING TEMPERATURE
PHYSICS
TESTING
THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
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HANDEREK, Vincent
description Methods and apparatus are disclosed for detecting a rate of change of temperature in the environment around a sensing optical fibre at a position along the fibre, in which a time varying coherent Rayleigh backscatter interference signal is detected using probe light backscattered within the sensing fibre from the position. A spectral density profile is calculated which represents frequency components in time variations of the interference signal. One or more properties of a feature of the spectral density profile are then used to determine the rate of change of temperature. The feature may be, for example, a decline in the spectral density profile with increasing frequency, or a peak in the spectral density profile.
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A spectral density profile is calculated which represents frequency components in time variations of the interference signal. One or more properties of a feature of the spectral density profile are then used to determine the rate of change of temperature. 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subjects MEASURING
MEASURING QUANTITY OF HEAT
MEASURING TEMPERATURE
PHYSICS
TESTING
THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
title DISTRIBUTED OPTICAL TEMPERATURE SENSOR
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