Optical fiber temperature distribution measuring device
US-9631983-B2 · Apr 25, 2017 · US
Optical fiber temperature distribution measuring device
US2016003687A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2016003687-A1 |
| Application number | US-201514740517-A |
| Country | US |
| Kind code | A1 |
| Filing date | Jun 16, 2015 |
| Priority date | Jul 7, 2014 |
| Publication date | Jan 7, 2016 |
| Grant date | — |
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Abstract
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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.
First claim
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What is claimed is: 1 . An optical fiber temperature distribution measuring device comprising: 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. 2 . The optical fiber temperature distribution measuring device according to claim 1 , wherein the temperature correction unit includes an optical fiber loss correction temperature storing unit for storing a temperature of the optical fiber at a point in time when a loss correction value of the optical fiber is obtained. 3 . The optical fiber temperature distribution measuring device according to claim 1 , wherein the temperature correction unit includes an optical fiber loss temperature characteristic storing unit for storing a temperature characteristic of a loss value of the optical fiber. 4 . The optical fiber temperature distribution measuring device according to claim 2 , wherein the temperature correction unit includes an optical fiber loss temperature characteristic storing unit for storing a temperature characteristic of a loss value of the optical fiber. 5 . The optical fiber temperature distribution measuring device according to claim 4 , wherein the temperature correction unit further includes: an optical fiber loss correction value storing unit for storing a loss correction value of the optical fiber; and a temperature correction calculation unit for correcting the temperature distribution by using the loss correction value of the optical fiber. 6 . The optical fiber temperature distribution measuring device according to claim 5 , wherein the temperature correction unit further includes a loss correction value calculation unit for correcting the temperature distribution by using the temperature dependence of the loss difference between the Stokes light and the anti-Stokes light based on the temperature of the optical fiber at the point in time when the loss correction value of the optical fiber is obtained, the temperature characteristic of the loss value of the optical fiber, and the temperature distribution corrected by the temperature correction calculation unit. 7 . The optical fiber temperature distribution measuring device according to claim 1 , further comprising an optical branching device for receiving the backward Raman scattered light and separating the backward Raman scattered light into the Stokes light and the anti-Stokes light.
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Classifications
- G01K11/32Primary
using changes in transmittance, scattering or luminescence in optical fibres · CPC title
Physics · mapped topic
Physics · mapped topic
using Brillouin scattering · CPC title
using Raman scattering · CPC title
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- What does patent US2016003687A1 cover?
- 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…
- Who is the assignee on this patent?
- Yokogawa Electric Corp
- What technology area does this patent fall under?
- Primary CPC classification G01K11/32. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Thu Jan 07 2016 00:00:00 GMT+0000 (Coordinated Universal Time) (A1). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 4 related publications on this page (citations in our corpus or others sharing the same primary CPC).