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A multi-parameter distributed optical fiber sensing device

A distributed optical fiber and sensing device technology, applied in the field of sensing, can solve the problems of not essentially integrating optical time domain reflection technology, etc., and achieve the effect of distinctive technical characteristics and practical value

Active Publication Date: 2016-03-02
STATE GRID CORP OF CHINA +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

They just connect the two devices to the fiber under test through an optical switch, without essentially integrating Brillouin optical time domain analysis technology and optical time domain reflectometry technology

Method used

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  • A multi-parameter distributed optical fiber sensing device
  • A multi-parameter distributed optical fiber sensing device
  • A multi-parameter distributed optical fiber sensing device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] See figure 1 , a multi-parameter distributed optical fiber sensing device provided in this embodiment, the details of the device are as follows:

[0060] The Brillouin optical time domain analysis mode and optical time domain reflection mode of the multi-parameter distributed optical fiber sensing device can be turned on at the same time. The structure and working process of the device in the Brillouin optical time domain analysis mode are as follows:

[0061] The laser light emitted by the first single-frequency laser 1 is divided into two paths through the first coupler 3a, and one path is introduced into an input end of the second coupler 3b, and then enters the first electro-optic modulator 4a after being output by the second coupler 3b. An electro-optic modulator 4a works in the pulse modulation mode, and its output is the pump light pulse required in the Brillouin optical time-domain analysis technology. The port is injected into the optical fiber under test from...

Embodiment 2

[0072] See figure 2 , a multi-parameter distributed optical fiber sensing device provided by an embodiment of the present invention, the details of the device are as follows:

[0073] The Brillouin optical time domain analysis mode and optical time domain reflection mode of the multi-parameter distributed optical fiber sensing device cannot be turned on at the same time. When the device turns on the Brillouin optical time domain analysis mode, the device structure and its working process are as follows:

[0074] The laser light emitted by the first single-frequency laser 1 is divided into two paths through the first coupler 3a, one path is connected to an input end of the second coupler 3b, and then enters the first electro-optic modulator 4a after being output by the second coupler 3b. An electro-optic modulator 4a works in the pulse modulation mode, and its output is the pump light pulse required in the Brillouin optical time-domain analysis technology. 2 ports are injecte...

Embodiment 3

[0085] See image 3 , a multi-parameter distributed optical fiber sensing device provided by an embodiment of the present invention, the details of the device are as follows:

[0086] The Brillouin optical time domain analysis mode and the optical time domain reflection mode of the multi-parameter distributed optical fiber sensing device can be turned on simultaneously. The structure and working process of the device in the Brillouin optical time domain analysis mode are as follows:

[0087] The laser light emitted by the first single-frequency laser 1 is divided into two paths by the first coupler 3a, and one path enters the first electro-optic modulator 4a. The first electro-optic modulator 4a works in the pulse modulation mode, and its output is Brillouin optical time domain The pump light pulse required in the analysis technology, the light pulse is amplified by the erbium-doped fiber amplifier 13 and then connected to the second coupler 3b, then output from the second co...

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Abstract

The invention highly integrates the optical path, circuit and signal acquisition and processing parts of the Brillouin optical time domain analyzer and the optical time domain reflector, forming a novel multi-parameter distributed optical fiber sensing device. The invention couples the pumping light source used in the Brillouin optical time domain analysis technology and the detection light source required by the optical time domain reflection technology into the measured optical fiber through a coupler. The two laser light sources work in different wavelength ranges. Correspondingly, the Brillouin optical time domain analysis signal and the optical time domain reflection signal are separated by the wavelength division multiplexer, and then the separated optical signals enter the photodetector respectively, and then Acquisition, calculation, processing and display are respectively performed through the analog-to-digital conversion module, signal processing module and display module, so as to finally realize distributed measurement of temperature and / or stress, optical fiber characterization and fault location.

Description

technical field [0001] The invention belongs to the field of sensing technology, and in particular relates to a multi-parameter distributed optical fiber sensing device. Background technique [0002] Distributed optical fiber sensing technology has important applications in optical fiber characterization, fault location, and monitoring of optical fiber ambient temperature, stress, and vibration. Optical time domain reflection technology, optical time domain analysis technology, and optical frequency domain analysis technology are several commonly used technologies in distributed optical fiber sensing technology. However, each technology corresponds to a small number of optical fiber sensing parameters, which is difficult to meet the actual monitoring application. monitoring requirements for various environmental parameters. For example, OTDR based on OTDR technology can only characterize optical fibers, such as dispersion measurement, loss measurement, and fiber fault locat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D5/353
CPCG01D5/353G01D5/35364G01D5/35387
Inventor 吕立冬何金陵李垠韬梁云李炳林郭经红邓洁清任建伟
Owner STATE GRID CORP OF CHINA