Optical fiber sensor based on Mach-Zehnder interference

An optical fiber sensor and optical fiber technology, which is applied in the direction of instruments, scientific instruments, and optical devices, can solve the problems of high cost, expensive, and difficult mass production of photonic crystal optical fibers, and achieve the effects of low cost, reduced production cost, and simple production

Active Publication Date: 2013-07-24
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

However, the cost of photonic crystal fiber is high, and it is not easy to produce in large quantities, and the production of fiber grating also requires expensive lasers, masks and fine writing technology

Method used

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  • Optical fiber sensor based on Mach-Zehnder interference
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Embodiment

[0030] The test and verification device for measuring curvature and temperature of the sensor of the present invention is as figure 2 As shown, the light of the spectral light source 8 is input into the sensor 10 of the present invention through the leading single-mode fiber 9 , and output to the spectrum analyzer 12 through the leading-out single-mode fiber 11 . By adjusting the knob 14 of the high-precision five-dimensional adjustment frame 13, the adjustment frame moves inward, and the sensing unit 10 bends, and the corresponding curvature is calculated from the initial displacement and the inward movement distance of the adjustment frame. The transmission spectra corresponding to different curvatures are recorded by the spectrum analyzer 12, such as image 3 shown.

[0031] from Figure 4 It can be obtained that the sensitivity to curvature at the two valley wavelengths A and B are -8.058nm / m respectively -1 and -5.716nm / m -1 . The parameters of the sensing unit in t...

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Abstract

The invention discloses an optical fiber sensor based on Mach-Zehnder interference. The optical fiber sensor comprises a first single mode optical fiber, a second single mode optical fiber and a third single mode optical fiber, the first single mode optical fiber is connected with the second single mode optical fiber through a super-steep-cone melting point, the second single mode optical fiber is connected with the third single mode optical fiber through a lateral deviation melting point, fiber cores of the first single mode optical fiber and the second single mode optical fiber are coaxially connected in a melting mode at the position of the super-steep-cone melting point, covering layers of the first single mode optical fiber and the second single mode optical fiber are melted and connected in a super-steep-cone mode, fiber cores and covering layers of the second single mode optical fiber and the third single mode optical fiber are melted and connected in a lateral deviation mode at the position of the lateral deviation melting point, the lateral deviation amount is 4-6 micrometers, and the length of the second single mode optical fiber is 5mm-10mm. The optical fiber sensor can simultaneously measure curvature and temperature, and is simple in structure, easy to manufacture, low in cost and suitable for mass production.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensing, in particular to an optical fiber sensor based on Mach-Zehnder interference. Background technique [0002] Curvature measurement has a wide range of applications in mechanical structure monitoring, robotic arms, civil engineering, and structural health monitoring. Compared with traditional sensors, fiber optic sensors are widely favored by people because of their advantages such as electrically passive operation, immunity to electromagnetic interference, high sensitivity, and small size. Based on the Mach-Zehnder interferometer in the fiber line, it has attracted great attention because of its compact structure, easy fabrication and low cost. By introducing a mode beam splitter and a mode beam combiner into the single-mode fiber, it can form . Many fiber optic in-line curvature sensors based on Mach-Zehnder interference structures have also been proposed. There are tapered based,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/24G01K11/32
Inventor 毛莉莉鲁平劳泽锋刘德明
Owner HUAZHONG UNIV OF SCI & TECH
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