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Multimode fiber strain sensor with high sensitivity and measuring system

A technology of strain sensor and multi-mode optical fiber, which is applied in the direction of measuring devices, instruments, and optical devices, etc., can solve the problems of high dependence on the accuracy of demodulation equipment, inability to achieve high-precision measurement, and susceptibility to interference, etc., to achieve the best stability and anti-interference, increased spectral drift, avoiding the effect of the preparation process

Inactive Publication Date: 2015-12-09
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

However, the sensitivity of the above methods to measure the strain is not more than 10pm / με
For the measurement of small deformation, the accuracy of the demodulation equipment is highly dependent, and the requirements for high-precision measurement cannot be achieved
In recent years, some researchers have proposed the use of double annular cavity to realize the vernier effect to improve the sensitivity of strain measurement, and achieved a sensitivity of 40pm / με, but the measurement range is only 10με, and the structure is complex and easily disturbed

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  • Multimode fiber strain sensor with high sensitivity and measuring system
  • Multimode fiber strain sensor with high sensitivity and measuring system

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[0023] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

[0024] like figure 1 As shown, the high-sensitivity multimode optical fiber strain measurement system of the embodiment of the present invention includes a broadband light source 1, a first single-mode optical fiber 2, a chiral multimode optical fiber 3, a second single-mode optical fiber 4, a spectrum analyzer 5, and a signal processing Device 6. The broadband light source 1 is connected to t...

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Abstract

The present invention relates to a chiral multimode fiber strain sensor with high sensitivity and a strain measuring system belonging to the technical field of fiber strain measurement. An existing fiber strain sensor is composed of a single mode fiber, a multimode fiber and a single mode fiber by fusion splicing, and has low measuring sensitivity. The multimode fiber strain sensor provided by the invention is composed of a single mode fiber, a twisted chiral multimode fiber and a single mode fiber by fusion splicing. A preparation method for the chiral multimode fiber includes the steps of fixing two ends of the multimode fiber through a fixture, heating the middle region and twisting simultaneously, and cooling to acquire the chiral multimode fiber. The strain measuring system includes the multimode fiber strain sensor with high sensitivity, a broadband light source, a spectrum analyzer and a signal processor. The broadband light source connects the fiber strain sensor with high sensitivity, the output end of the sensor connects the spectrum analyzer, and the signal processor analyzes an output spectrum and displays a measuring result. Compared to a traditional fiber strain measuring method, the multimode fiber strain sensor with high sensitivity is simple in preparation, is strong in anti-interference capability, and has highest sensitivity.

Description

technical field [0001] The invention belongs to the technical field of optical fiber strain measurement, and more specifically relates to the preparation of a highly sensitive multimode optical fiber strain sensor. Background technique [0002] Accurate fiber optic strain measurement is important in fiber optic communication and fiber optic sensing systems. [0003] In order to meet the demand for high-precision measurement in many application fields such as large-scale structural health monitoring of buildings and early warning of natural disasters such as earthquakes, people have done a lot of research on strain detection of structures, using various measurement technologies such as electrical sensing. However, due to the influence of electromagnetic interference, chemical corrosion, and humid environment in this traditional measurement method, the electrical measurement method has many shortcomings in terms of long-term measurement, real-time performance, and high precisi...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/16
Inventor 刘德明孙远鲁平
Owner HUAZHONG UNIV OF SCI & TECH
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