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Optical fiber high-temperature stress sensor based on yttrium aluminum garnet crystal derived optical fiber and preparation method of optical fiber high-temperature stress sensor

A technology of yttrium aluminum garnet and stress sensor, applied in instruments, measuring devices, etc., can solve problems such as cross-interference, and achieve the effects of high melting point, low preparation cost, stable chemical properties and mechanical strength

Pending Publication Date: 2022-07-22
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the fiber Bragg grating high-temperature stress sensor and the Fabry-Perot interferometer high-temperature stress sensor are sensitive to temperature and stress at the same time. When a single parameter needs to be measured, it will be affected by another parameter and cause cross-interference problems.

Method used

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  • Optical fiber high-temperature stress sensor based on yttrium aluminum garnet crystal derived optical fiber and preparation method of optical fiber high-temperature stress sensor
  • Optical fiber high-temperature stress sensor based on yttrium aluminum garnet crystal derived optical fiber and preparation method of optical fiber high-temperature stress sensor
  • Optical fiber high-temperature stress sensor based on yttrium aluminum garnet crystal derived optical fiber and preparation method of optical fiber high-temperature stress sensor

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The invention discloses an optical fiber high temperature stress sensor based on yttrium aluminum garnet crystal-derived optical fiber, comprising a first single-mode optical fiber 1, a second single-mode optical fiber 2, a yttrium aluminum garnet crystal-derived optical fiber 3, and a first fusion surface 4, The second fusion splicing surface 5 and the fiber Bragg grating 6; in this embodiment, the fiber Bragg grating is provided on the first single-mode fiber 1, and the two ends of the yttrium aluminum garnet crystal-derived fiber 3 are connected to the first single-mode fiber 1, the second fiber Bragg grating Two single-mode optical fibers are fused in two phases, and the fusion surfaces are the first fusion surface 4 and the second fusion surface 5 respectively. The first fusion surface 4 and the second fusion surface 5 are used as two reflecting surfaces and the yttrium aluminum garnet crystal-derived fiber 3 is common Form a fiber-optic Fabry-Perot interferometer. ...

Embodiment 2

[0045] This embodiment provides a temperature response test of an optical fiber high temperature stress sensor based on yttrium aluminum garnet crystal-derived optical fiber, including the following steps:

[0046] (1) Connect the single-mode fiber 1 of the high-temperature stress sensor to a fiber coupler, and the other ends of the fiber coupler are connected to a broadband light source (Denmark NKT Photonics, Superk Compact) and a spectrum analyzer (Japan Yokogawa, AQ6370B). Among them, the broadband light source outputs supercontinuum light, and the spectrum analyzer is used to monitor the reflection spectrum, and set its wavelength resolution to 20pm and the wavelength scanning range to 1430-1480nm.

[0047] (2) The high temperature stress sensor is placed in a CINITE tube furnace (CINITE, QSK-5-17) for heating, and the temperature resolution of the CINITE tube furnace is ±0.1°C. The temperature characteristics were demonstrated at 100°C temperature intervals between room ...

Embodiment 3

[0050] This embodiment provides a stress response test of an optical fiber high temperature stress sensor based on yttrium aluminum garnet crystal-derived optical fiber at room temperature, including the following steps:

[0051] (1) Fix one end of the single-mode fiber 1 of the high-temperature stress sensor, and apply an axial tensile force to the other end of the single-mode fiber 2. The stress measuring instrument can monitor the stress exerted on the sensor in real time.

[0052] (2) Connect the single-mode fiber 1 of the high-temperature stress sensor to a fiber coupler, and the other ends of the fiber coupler are connected to a broadband light source (Superk Compact from NKT Photonics, Denmark) and a spectrum analyzer (AQ6370B from Yokogawa, Japan). Among them, the broadband light source outputs supercontinuum light, and the spectrum analyzer is used to monitor the reflection spectrum, and set its wavelength resolution to 20pm and the wavelength scanning range to 1430-14...

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Abstract

The invention discloses an optical fiber high-temperature stress sensor based on an yttrium aluminum garnet crystal derived optical fiber and a preparation method thereof, and belongs to the field of optical fiber sensing, and the optical fiber high-temperature stress sensor comprises a single-mode optical fiber and the yttrium aluminum garnet crystal derived optical fiber; a fiber bragg grating is arranged on the single-mode fiber; the yttrium aluminum garnet crystal derived optical fiber is welded with the two single-mode optical fibers, and the two welding surfaces serve as two reflecting surfaces to form the optical fiber Fabry-Perot interferometer together with the yttrium aluminum garnet crystal derived optical fiber. The optical fiber high-temperature stress sensor is formed by cascading the Fabry-Perot interferometer and the optical fiber Bragg grating, and the sensitivity of the optical fiber Bragg grating to temperature and the sensitivity of the optical fiber Fabry-Perot interferometer to stress are different. The problem of cross interference is solved through a method for solving sensitivity matrixes of the fiber Bragg grating and the fiber Fabry-Perot interferometer, and double-parameter measurement of temperature and stress is achieved. The invention has the advantages of small volume, high temperature resistance, simple preparation process, low preparation cost and the like.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, and in particular relates to an optical fiber high temperature stress sensor based on a yttrium aluminum garnet crystal-derived optical fiber and a preparation method thereof. Background technique [0002] In the fields of aerospace, metallurgy and energy industries, temperature and stress are important parameters, which are especially important for the detection of the environment. However, for detection in harsh environments, high temperature, high pressure and some corrosive gases make it difficult for traditional electronic sensors to measure continuously and stably, which poses a huge challenge to the design of the sensor. Optical fiber sensors have attracted widespread attention due to their small size, light weight, high temperature resistance, corrosion resistance, electromagnetic interference resistance, and distributed sensing. [0003] At present, the application schemes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D21/02
CPCG01D21/02
Inventor 李爱武单天奇国旗于永森
Owner JILIN UNIV
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