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Micro nano fiber vibration sensor based on hollow fiber

A vibration sensor, hollow-core fiber technology, applied in instruments, measuring devices, measuring ultrasonic/sonic/infrasonic waves, etc., can solve the problems of low reflectivity, expensive equipment, small size, etc., achieve small size, small cross-sensitivity, and improved The effect of sensitivity

Active Publication Date: 2016-11-16
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The sensor is small in size and can withstand high temperatures of 1000°C, but the equipment required for processing is expensive, and the optical reflective surface is bombarded by ion beams, so it is difficult to make it very flat, resulting in low reflectivity and weak signal

Method used

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  • Micro nano fiber vibration sensor based on hollow fiber
  • Micro nano fiber vibration sensor based on hollow fiber
  • Micro nano fiber vibration sensor based on hollow fiber

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Embodiment 1

[0031] A micro-nano optical fiber vibration sensor based on femtosecond laser micromachining, comprising: a single-mode optical fiber 1, a hollow-core optical fiber 2, and a solid-core optical fiber 3; wherein, the femtosecond laser ablates the solid-core optical fiber 3 to form a cantilever 4, and the solid-core The optical fiber 3 is used as a mass block;

[0032] The single-mode optical fiber 1, the hollow-core optical fiber 2 and the solid-core optical fiber 3 are sequentially fused; the hollow-core optical fiber 2 is ablated by a femtosecond laser to form a cantilever beam 4, and the solid-core optical fiber 3 is used as a mass block.

[0033] The length of the hollow-core fiber 2 is 1000 μm, the outer diameter is the same as that of the single-mode fiber 1, which is 125 μm, the inner diameter is 93 μm, and the femtosecond laser ablation depth is 90 μm; the length of the solid-core fiber 3 is 3000 μm.

[0034] processing methods:

[0035] Step 1, the single-mode fiber 1 ...

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Abstract

The invention relates to a micro nano fiber vibration sensor based on a hollow fiber and belongs to the field of fiber sensing. A single-mode fiber, a hollow fiber and a solid core fiber are welded in sequence. The hollow fiber is a hollow cylindrical column. The center of the side surface of the circular column is provided with a groove, and the length in the axial direction of the groove needs to be smaller than the length of the hollow cylindrical column. The groove is formed by burning the side surface of the hollow fiber with a femto second laser. The invention solves the problem that a reflective surface formed when processing the fiber with the femto second laser has a low reflectivity or does not have a reflectivity; and the micro nano fiber vibration sensor is featured by small size, high resonance frequency, high temperature resistance, electromagnetic interference resistance and the like, and can be used for vibration measurement in high temperature environments.

Description

technical field [0001] The invention relates to a micro-nano optical fiber vibration sensor based on a hollow-core optical fiber, which belongs to the field of optical fiber sensing. Background technique [0002] In recent years, there has been an increasing demand for vibration monitoring in high-temperature environments, such as monitoring of aero-engines, generators, engines, and motors of large-scale equipment, etc., and the working temperature can reach 1200°C. [0003] Traditional high-temperature vibration sensors can be divided into eddy current type, electromagnetic induction type and piezoelectric effect type according to the principle of converting mechanical vibration signals into electrical signals. Commercial high-temperature vibration sensors made of these principles, such as SHQ-80 of Beihang Technology Institute, 8310 of B.K Company, 6237M69A and 6237M70 of ENDVCO Company, are large in size and cannot realize high-temperature vibration monitoring above 700 °...

Claims

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Application Information

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IPC IPC(8): G01H9/00
CPCG01H9/004
Inventor 江毅张柳超姜澜刘达王素梅
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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