Method for analyzing stress in an object
US-10036677-B2 · Jul 31, 2018 · US
Distributed brillouin sensing using correlation
US9784567B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9784567-B2 |
| Application number | US-201514842542-A |
| Country | US |
| Kind code | B2 |
| Filing date | Sep 1, 2015 |
| Priority date | Oct 16, 2014 |
| Publication date | Oct 10, 2017 |
| Grant date | Oct 10, 2017 |
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Abstract
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Methods and systems for sensing conditions of a fiber include splitting a light signal into two branches. A first branch is converted to have a mode different from that of the second branch. Both branches are mode multiplexed into a single fiber. An output of the fiber is mode demultiplexed into the two branches. The first branch is mode converted to its original mode. Brillouin scattering patterns of the two branches are compared to determine a temperature and strain profile of the fiber.
First claim
Opening claim text (preview).
The invention claimed is: 1. A method for sensing conditions of a fiber, comprising: splitting a light signal into two branches; converting a first branch to have a mode different from that of the second branch; mode multiplexing both branches into a single fiber; mode demultiplexing an output of the fiber into the two branches; mode converting the first branch to the original mode of the first branch; comparing Brillouin scattering patterns of the two branches to determine a temperature and strain profile of the fiber. 2. The method of claim 1 , further comprising polarizing each of the two branches to have orthogonal polarizations. 3. The method of claim 1 , further comprising coherently detecting the output of the fiber in the two branches. 4. The method of claim 1 , wherein comparing the Brillouin scattering patterns comprises determining a Brillouin frequency shift of each branch. 5. The method of claim 4 , wherein determining the temperature and strain profiles ΔT and Δε of the fiber comprises solving: Δ T = C v ɛ Mode 2 · Δ v B Model 1 - C v ɛ Mode 1 · Δ v B Mode 2 C v ɛ Mode 2 · C vT Model 1 - C v ɛ Mode 1 · C vT Mode 2 . Δ ɛ = C v
Assignees
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Classifications
- G01B11/168Primary
by means of polarisation · CPC title
- G01K11/32Primary
using changes in transmittance, scattering or luminescence in optical fibres · CPC title
Physics · mapped topic
using Brillouin scattering · CPC title
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- What does patent US9784567B2 cover?
- Methods and systems for sensing conditions of a fiber include splitting a light signal into two branches. A first branch is converted to have a mode different from that of the second branch. Both branches are mode multiplexed into a single fiber. An output of the fiber is mode demultiplexed into the two branches. The first branch is mode converted to its original mode. Brillouin scattering patt…
- Who is the assignee on this patent?
- Nec Lab America Inc, Nec Corp
- What technology area does this patent fall under?
- Primary CPC classification G01B11/168. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Tue Oct 10 2017 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).