Sensitivity enhanced sensor based on Loyt-Sagnac interferometer

A sensitivity and sensor technology, which is applied in the field of sensitivity-enhanced sensors, can solve the problem that the sensitivity of the sensor cannot be greatly improved, and achieve the effects of low cost, easy implementation, and simple structure

Active Publication Date: 2016-06-29
SOUTHWEST JIAOTONG UNIV
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The above sensor sensitivity based on the Sagnac ring canno

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  • Sensitivity enhanced sensor based on Loyt-Sagnac interferometer
  • Sensitivity enhanced sensor based on Loyt-Sagnac interferometer
  • Sensitivity enhanced sensor based on Loyt-Sagnac interferometer

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[0019] The present invention will be further described below in conjunction with the accompanying drawings.

[0020] figure 1 It is a device diagram of a sensitivity-enhanced sensor based on a Loyt-Sagnac interferometer. The broadband light source 1 emits a laser beam. The bandwidth of the broadband light source used in the experiment is 60nm. The light enters the coupler 3 through the optical isolator 2, and the coupler divides the light wave into Two beams of waves propagating in opposite directions, wherein the light propagating in the clockwise direction respectively passes through the first polarization controller 4, the reference fiber 5, the single-mode fiber 6, the second polarization controller 7 and the sensing fiber 8 in the loop, The light transmitted in the counterclockwise direction respectively passes through the sensing fiber 8, the second polarization controller 7, the single-mode fiber 6, the reference fiber 5 and the first polarization controller 4, and the ...

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Abstract

The invention discloses a sensitivity enhanced sensor based on a Loyt-Sagnac interferometer. The sensor is characterized in that a laser beam emitted by a broadband light source is input to a coupler 3 via an optical isolator 2, the coupler divides light waves into two paths transmitted in different directions, the light transmitted in the clockwise direction passes a first polarization controller 4, a reference fiber 5, a single-mode fiber 6, a second polarization controller 7 and a sensing fiber 8 in a loop, the light transmitted in the anticlockwise direction passes the sensing fiber 8, the second polarization controller 7, the single-mode fiber, the reference fiber and the first polarization controller 4, the length difference between the reference fiber and the sensing fiber is 10%, the two light beams pass the loop again, reach the coupler 3 and output coherently, and output light is received by a spectrum analyzer 9 for subsequent analysis. A new interferometer structure uses two high-birefringence fibers (the reference fiber 5 and the sensing fiber 8) of different lengths to generate a vernier effect, the measuring precision can be effectively improved, the structure is simple, preparation is easy, the cost is low, and the sensitivity enhanced sensor has potential in high-precision physical quantity sensing.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, and in particular relates to a sensitivity-enhanced sensor based on a Loyt-Sagnac interferometer structure. Background technique [0002] With the development of fiber optic technology, fiber optic Sagnac interferometer plays an increasingly important role in the fields of fiber optic communication and fiber optic sensing. The optical fiber Sagnac interferometer has the advantages of simple structure, strong reliability, anti-electromagnetic interference, and high precision. It has been widely used in the field of optical fiber sensing in recent years. Optical fiber sensors based on interferometric technology are widely used in the measurement of various physical quantities, including pressure, stress, temperature, current and twist sensing. Its main structures include MZ interferometer, Michelson interferometer and Sagnac interferometer. Optical fiber sensors based on interferome...

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Application Information

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IPC IPC(8): G01L1/24G01K11/32
CPCG01K11/32G01L1/242
Inventor 邵理阳朱梦芳张志勇闫连山潘炜罗斌
Owner SOUTHWEST JIAOTONG UNIV
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