Axial strain measuring system based on double-refraction optical loop mirror

A birefringent optical fiber, axial strain technology, applied in measurement devices, optical devices, instruments, etc., can solve the problems of increasing the cost and system complexity of the system, achieving increased system complexity, improved strain sensitivity, and significant progress. sexual effect

Inactive Publication Date: 2013-09-25
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

Sensitivity is one of the important indicators of the sensor, which has always been concerned by scholars. Among them, some scholars proposed to improve the strain sensitivity of the system by using birefringent fibers with higher birefringence index as much as possible, and some scholars proposed to improve the strain sensitivity of the system through structural innovation. Improve the strain sensitivity of the birefringent fiber optic loop mirror, but the structural innovation method increases the cost and complexity of the system while improving the strain sensitivity of the birefringent fiber optic loop mirror

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  • Axial strain measuring system based on double-refraction optical loop mirror
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  • Axial strain measuring system based on double-refraction optical loop mirror

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Embodiment Construction

[0016] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0017] like figure 1 As shown, the present invention proposes a kind of axial strain measurement system based on birefringent fiber loop mirror, including fiber coupler, birefringent fiber, light source and spectrometer, wherein, the two ends of birefringent fiber are connected with the two ends of fiber coupler respectively The two output arms are connected, the light source is connected with the light source input port of the fiber coupler, and the input end of the spectrometer is connected with the interference spectrum output port of the fiber coupler; -6 ~2×10 -4 birefringent fiber.

[0018] As a preferred technical solution of the present invention: the fiber coupler is a 3dB fiber coupler.

[0019] As a preferred technical solution of the present invention: the light source is a broadband light source.

[0020...

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Abstract

The invention relates to the axial strain measuring system based on a double-refraction optical loop mirror. The axial strain measuring system comprises an optical fiber coupler, a double-refraction optical fiber, a light source and a spectrograph. The two ends of the double-refraction optical fiber are connected with two output arms of the optical fiber coupler respectively, the light source is connected with a light source input port of the optical fiber coupler, and the input end of the spectrograph is connected with an interference spectrum output port of the optical fiber coupler. The birefringence of the double-refraction optical fiber is 7.7024*10-6-2*10-4. According to the axial strain measuring system based on the double-refraction optical loop mirror, the double-refraction optical fiber with the birefringence of 7.7024*10-6-2*10-4 is applied, the cost is controlled, the system complexity is not increased, the strain sensitivity of the double-refraction optical loop mirror can be effectively improved, and the axial strain measuring system has high application value.

Description

technical field [0001] The invention relates to an axial strain measurement system based on a double refraction fiber loop mirror. Background technique [0002] Birefringent fiber optic loop mirrors are widely used in the fields of sensing and measuring strain, temperature, displacement, and bending due to their advantages of simple fabrication, high sensitivity, low cost, and polarization independence. Sensitivity is one of the important indicators of the sensor, which has always been concerned by scholars. Among them, some scholars proposed to improve the strain sensitivity of the system by using birefringent fibers with higher birefringence index as much as possible, and some scholars proposed to improve the strain sensitivity of the system through structural innovation. The strain sensitivity of the birefringent fiber optic loop mirror is improved, but the structural innovation method increases the cost and complexity of the system while improving the strain sensitivity ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/16
Inventor 江莺曾捷梁大开曹海东张先辉石庆华
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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