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Distributed optical fiber sensing device

A technology of distributed optical fiber and sensing device, which is applied in the direction of measuring device, using optical device to transmit sensing components, converting sensor output, etc., can solve the problems of increasing pulse laser, increasing measurement time, sacrificing spatial resolution, etc., and achieve detection Effects of long distance, short measurement time, and cost reduction

Pending Publication Date: 2020-05-01
杭州光传科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] 3. Increase the pulse width of the pulse laser; increasing the pulse width of the pulse laser will sacrifice the spatial resolution, that is to say, the width of the pulse laser cannot be increased blindly
[0009] 4. Increase the number of cumulative averages; obviously, increasing the number of cumulative averages will increase the measurement time, that is to say, the number of cumulative averages cannot be increased blindly due to the limitation of the measurement time
[0010] At present, the longest effective detection distance of distributed optical fiber sensing devices based on the Brillouin scattering effect is only 75 kilometers, which cannot fully meet the application requirements in fields such as electric power and petroleum.

Method used

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Examples

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Embodiment 1

[0040] figure 1 Schematically provides a simplified structural diagram of the distributed optical fiber sensing device of the embodiment of the present invention, such as figure 1 As shown, the distributed optical fiber sensing device includes:

[0041] Loopback optical fiber 41, such as an optical cable not less than a double-core optical fiber, the length of the optical cable is 100 kilometers, and the far end of the optical cable fuses the double-core optical fiber together to form the loopback optical fiber 41. is 200 kilometers;

[0042] Optical fiber circulator 21, such as a three-port optical fiber circulator, the incident laser light enters from the first port and reaches the second port, and the backscattered light enters from the second port and then reaches the third port;

[0043] The detector 31, such as an InGaAs photodetector, is used to detect the backscattered light of the loopback optical fiber 41, and convert the backscattered light into an electrical sign...

Embodiment 2

[0053] The distributed optical fiber sensing device according to the embodiment of the present invention is different from Embodiment 1 in that:

[0054] Such as figure 2 As shown, the distributed optical fiber sensing device also includes an optical amplifier 61, and the optical amplifier 61 is located on the upstream or downstream optical path of the blocker 51, and the power of the continuous laser light transmitted backward in the loopback optical fiber 41 is controlled by the optical amplifier 61. Amplifier 61 boosts.

[0055] Since the optical amplifier is located in the middle of the loop-back fiber, and its gain is relatively large, the power of the continuous laser light emitted by the second light source and entering the loop-back fiber can be greatly reduced. When the reverse-transmitted CW laser in the loopback fiber reaches the optical amplifier, the CW laser achieves relay amplification at the optical amplifier, compensating for the transmission loss of the CW ...

Embodiment 3

[0059] The distributed optical fiber sensing device according to the embodiment of the present invention is different from Embodiment 2 in that:

[0060] The blocker is built in the optical amplifier, and the blocker is located behind the output end of the optical amplifier, that is, the optical amplifier is a unidirectional optical amplifier, which is convenient for on-site deployment.

[0061] In this embodiment, the optical amplifier is an erbium-doped fiber amplifier EDFA with a working wavelength of 1550±20nm and a gain of 15dB for small signals. The blocker is a one-way two-stage fiber optic isolator with a working wavelength of 1550±20nm, one-way transmission, and an isolation degree greater than 35dB. The unidirectional dual-stage fiber optic isolator is located directly behind the output end of the erbium-doped fiber amplifier EDFA to realize unidirectional small signal amplification. The integrated structure is highly integrated and convenient for on-site deployment....

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Abstract

The invention provides a distributed optical fiber sensing device. The distributed optical fiber sensing device comprises a loopback optical fiber, an optical fiber circulator and a detector, whereinpulse laser emitted by a first light source enters the loopback optical fiber through the optical fiber circulator, and back scattering light of the pulse laser is received by the detector; continuouslaser emitted by a second light source enters the loopback optical fiber, and the continuous laser is received by the detector through the optical fiber circulator; and the pulse laser transmitted inthe forward direction in the loopback optical fiber is blocked at a blocker, and the continuous laser transmitted in the reverse direction in the loopback optical fiber penetrates through the blocker. The distributed optical fiber sensing device has the advantages of being long in effective detection distance, short in detection time consumption and the like.

Description

technical field [0001] The invention relates to temperature and strain detection, in particular to a device for sensing external temperature and / or strain by using an optical fiber. Background technique [0002] Distributed optical fiber sensing technology has the advantages of continuous distributed detection, long detection distance, accurate positioning, rich measurement information, intrinsic safety, and low cost. It has been widely used in fields such as electric power, petroleum, bridges, tunnels, and slopes. [0003] Among all kinds of optical fiber sensing technologies, the distributed optical fiber sensing device based on the Brillouin scattering effect is a new type of sensing device, which directly uses optical fiber as the sensing element, and combines "transmission" and "sensing" into one, which can Sensing temperature and / or strain along the fiber. The distributed optical fiber sensing device includes a light source, an optical fiber circulator, an optical fib...

Claims

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Application Information

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IPC IPC(8): G01D5/353
CPCG01D5/35364G01D5/3537
Inventor 涂勤昌张春艳卢海洋
Owner 杭州光传科技有限公司
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