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Fiber Bragg gating temperature sensor and sensitivity enhancement method thereof

A Bragg optical fiber and temperature sensor technology, applied in thermometers, thermometers with physical/chemical changes, instruments, etc., to achieve enhanced temperature sensitivity, enhanced effect efficiency, and improved temperature resolution

Inactive Publication Date: 2014-09-10
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this technology has inherently limited temperature sensitivity sensing characteristics, and its temperature sensitivity is still determined by the intrinsic properties of FBG, so it will be limited to ~15pm / ℃

Method used

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  • Fiber Bragg gating temperature sensor and sensitivity enhancement method thereof
  • Fiber Bragg gating temperature sensor and sensitivity enhancement method thereof
  • Fiber Bragg gating temperature sensor and sensitivity enhancement method thereof

Examples

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Embodiment 1

[0031] Such as figure 1 As shown, the present embodiment includes: a fiber laser system using a fiber Bragg grating FBG as a narrow-band filter unit and a four-wave mixing frequency chirp amplification system for all-optical signal processing, wherein: the fiber laser system includes: a fiber Bragg grating FBG, optical Amplifier EDFA and fiber resonator, frequency chirp amplification system includes: single-frequency laser LD, erbium-doped optical amplifier EDFA, nonlinear element and filter BFP;

[0032] The fiber Bragg grating FBG, optical amplifier EDFA and fiber resonant cavity constitute a ring cavity structure.

[0033] Such as figure 2 As shown, the described fiber laser system includes: erbium-doped fiber amplifier EDFA, circulator CIR, polarization controller PC, isolator ISO, coupler OC, optical filter BPF connected in sequence to form a loop and connected with the circulator CIR The fiber Bragg grating FBG, wherein: the spontaneous emission light output by the er...

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Abstract

Disclosed are a fiber Bragg gating temperature sensor and a sensitivity enhancement method thereof. The fiber Bragg gating temperature sensor comprises a fiber laser system and a four-wave mixing frequency chirp amplification system with all-optical signal processing. The fiber laser system adopts fiber Bragg gating as a narrow-band filtering unit. The fiber laser system comprises the fiber Bragg gating, an optical amplifier and an optical fiber resonant cavity. The frequency chirp amplification system comprises a single-frequency laser, an erbium-doped fiber amplifier, a non-linear element and a filter. By the all-optical signal processing, efficiency amplification of the frequency chirp is realized, and by the temperature sensor with the ultra-high temperature sensitivity achieved from the common single-mode fiber Bragg gating, the temperature sensitivity of the common fiber Bragg gating is increased with double amplitude.

Description

technical field [0001] The invention relates to a device and a method in the technical field of optical detection devices, in particular to a high-sensitivity Fiber Bragg Grating (FBG) temperature sensor and a method for enhancing temperature sensitivity. Background technique [0002] In recent years, fiber optic sensing has been applied in a wide range of fields due to its advantages of anti-radiation, anti-interference, anti-corrosion, low cost, ultra-small, pollution-free, safe and reliable. In particular, fiber optic sensors using Fiber Bragg Gratings (FBG) can achieve high-sensitivity temperature and strain measurements, which can be used for high temperature monitoring, building health monitoring, fire safety monitoring, deformation detection of dams and bridges, etc. [0003] Generally speaking, the temperature sensitivity of 13pm / ℃ can be obtained by using the fiber Bragg grating of traditional single-mode fiber [K.T.V.Grattan and T.Sun, "Fiber optic sensor technolog...

Claims

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Application Information

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IPC IPC(8): G01K11/32G01K11/3206
Inventor 何祖源杜江兵樊昕昱刘庆文
Owner SHANGHAI JIAO TONG UNIV
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