Optical fiber temperature distribution measuring device
First Claim
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1. An optical fiber temperature distribution measuring device comprising:
- an optical fiber as a sensor;
a calculation control unit, coupled to the optical fiber, for measuring a temperature distribution along the entire length of the optical fiber based on an intensity ratio between Stokes light and anti-Stokes light of backward Raman scattered light from the optical fiber; and
a temperature correction unit, coupled to the calculation control unit to obtain the temperature distribution, for correcting the temperature distribution based on a temperature dependence of a calculated loss difference, calculated by the temperature correction unit, between the Stokes light and the anti-Stokes light along the length of the optical fiber,wherein the temperature correction unit includes an optical fiber loss correction temperature storing unit for pre-storing a temperature value of the optical fiber,wherein the temperature correction unit includes an optical fiber loss temperature characteristic storing unit for pre-storing a temperature characteristic of the optical fiber which is a constant used in the temperature distribution correction calculation, andwherein the temperature correction unit corrects the temperature distribution based on the pre-stored temperature value and the pre-stored temperature characteristic.
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Abstract
An optical fiber temperature distribution measuring device includes: an optical fiber as a sensor; a calculation control unit for measuring a temperature distribution along the optical fiber based on an intensity ratio between Stokes light and anti-Stokes light of backward Raman scattered light from the optical fiber; and a temperature correction unit for correcting the temperature distribution by using temperature dependence of a loss difference between the Stokes light and the anti-Stokes light.
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5 Claims
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1. An optical fiber temperature distribution measuring device comprising:
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an optical fiber as a sensor; a calculation control unit, coupled to the optical fiber, for measuring a temperature distribution along the entire length of the optical fiber based on an intensity ratio between Stokes light and anti-Stokes light of backward Raman scattered light from the optical fiber; and a temperature correction unit, coupled to the calculation control unit to obtain the temperature distribution, for correcting the temperature distribution based on a temperature dependence of a calculated loss difference, calculated by the temperature correction unit, between the Stokes light and the anti-Stokes light along the length of the optical fiber, wherein the temperature correction unit includes an optical fiber loss correction temperature storing unit for pre-storing a temperature value of the optical fiber, wherein the temperature correction unit includes an optical fiber loss temperature characteristic storing unit for pre-storing a temperature characteristic of the optical fiber which is a constant used in the temperature distribution correction calculation, and wherein the temperature correction unit corrects the temperature distribution based on the pre-stored temperature value and the pre-stored temperature characteristic. - View Dependent Claims (2, 3, 4, 5)
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Specification