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Sensitivity-enhanced optical time domain reflection distributed Michelson interferometer based on two-core optical fiber

A technology of optical time domain reflection and dual-core optical fiber, applied in the field of optical fiber, can solve the problems of vibration detection and positioning accuracy decline, etc.

Inactive Publication Date: 2014-12-03
无锡万润光子技术有限公司
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Problems solved by technology

On the one hand, the characteristics of interferometric measurement are lost; on the other hand, due to the influence of environmental temperature changes on the birefringence of optical fibers, the positioning accuracy of vibration detection will also decrease.

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  • Sensitivity-enhanced optical time domain reflection distributed Michelson interferometer based on two-core optical fiber
  • Sensitivity-enhanced optical time domain reflection distributed Michelson interferometer based on two-core optical fiber
  • Sensitivity-enhanced optical time domain reflection distributed Michelson interferometer based on two-core optical fiber

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Embodiment Construction

[0031] The present invention is described in more detail below in conjunction with accompanying drawing:

[0032] combined with figure 1 , the embodiment of the present invention is that the light pulse is emitted by the light source, and the pulse period is In order to ensure that in the double-core optical fiber with a length of L, after the backscattered optical signal of the first optical pulse can be received, the second interrogation optical pulse is sent. After the optical pulse sent by the light source passes through the three-port optical fiber circulator, it is divided into two optical signals with approximately equal optical power by a 3dB optical fiber coupler with a splitting ratio of 1:1, and injected into the two cores of the dual-core optical fiber respectively. Since the two paths of light signals transmitted forward along the dual-core optical fiber will undergo Rayleigh scattering, the two paths of Rayleigh scattered light will be transmitted back to the 3d...

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Abstract

The invention provides a sensitivity-enhanced optical time domain reflection distributed Michelson interferometer based on a two-core optical fiber, which can be used for distributed optical fiber sensing and measuring. The system is composed of a light source (1), a three-port optical fiber circulator (2), a 2*2 optical fiber coupler (3), a two-core optical fiber (4), a photoelectric detector (6), a photoelectric detector (7) and a differential signal amplifying and processing circuit (8). In the system, optical time domain reflection is used for realizing distributed measurement; interference characteristics can realize tiny disturbance measurement; the differential signal detection characteristics can offset the average signal intensity to enable the interference signals to be multiplied; the two fiber cores are located in the same optical fiber, changes of environmental temperature are the same, and influences of the temperature can be eliminated; and as the two fiber cores are symmetrically distributed outside the axis, transverse disturbance enables mechanical transformation with amplifying differential to be formed between the two fiber cores, and the system sensitivity is enhanced. Thus, the use of the two-core optical fiber can greatly enhance the ability of response to tiny vibration signals.

Description

(1) Technical field [0001] The invention discloses a dual-core optical fiber sensitivity enhanced optical time domain reflection distributed Michelson interferometer, which can be used for distributed optical fiber sensing and measurement, and belongs to the technical field of optical fiber. (2) Background technology [0002] Taking advantage of the fact that the backward Rayleigh scattered light in the transmission fiber carries information such as the position of the fiber and external vibrations, a distributed Michelson interferometric optical time domain reflectometer can be constructed by using a dual-core fiber differential signal detection method. It provides the possibility for distributed interferometric sensing and measurement. [0003] In 1976, the Optical Time Domain Reflectometer (OTDR-Optical Time Domain Reflectmeter) invented by M.K.Barnoski and S.M.Jensen realized the distribution measurement of fiber loss by means of the detection of backscattered light in t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/353G02B6/42
Inventor 苑立波
Owner 无锡万润光子技术有限公司
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