Photonic crystal fiber temperature sensor and measuring method thereof

A photonic crystal fiber and temperature sensor technology, applied in the sensor field, can solve the problems of single structure and destroy the symmetry of the cladding structure, and achieve the effects of improved sensitivity, easy integration and miniaturization

Pending Publication Date: 2022-02-01
SOUTHWEAT UNIV OF SCI & TECH
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  • Abstract
  • Description
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Problems solved by technology

[0014] (1) Using photonic crystal fiber as the structural unit, flexible design of the cladding structure can realize structural diversification and solve the single ...

Method used

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  • Photonic crystal fiber temperature sensor and measuring method thereof
  • Photonic crystal fiber temperature sensor and measuring method thereof
  • Photonic crystal fiber temperature sensor and measuring method thereof

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Embodiment Construction

[0047] The specific technical solutions of the present invention are described with reference to the embodiments.

[0048] The invention utilizes the flexibility and diversity of the PCF air hole structure, and selectively fills the ethanol liquid in the designed air hole structure. When the external temperature changes, the birefringence of the photonic crystal fiber changes accordingly. At a wavelength of 1.55um, the PCF temperature sensitivity can reach 3.825×10-5 / ℃. Replacing the conventional birefringent fiber in the sagnac environment with this fiber, the temperature sensing is realized according to the shift of the resonance peak peak position of the transmission spectrum with temperature. The specific technical solutions are as follows:

[0049] like figure 1 As shown, the photonic crystal fiber temperature sensor includes a broad-spectrum light source 1, and the broad-spectrum light source 1 is connected to a 3dB coupler 2, and the 3dB coupler 2 is also connected to...

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Abstract

The invention relates to a photonic crystal fiber temperature sensor and a measuring method thereof. Light emitted by a wide-spectrum light source is divided into two beams of coherent light through a 3dB coupler, the two beams of coherent light are transmitted along opposite light paths in a photonic crystal fiber and then enter a spectrum analyzer through coherent superposition, an output spectrum is obtained, and the sensitivity of the temperature sensor is obtained according to the change relation of the formant peak value position of the transmission spectrum along with the movement of the temperature. According to the invention, the photonic crystal fiber is adopted, and the photonic crystal fiber has the excellent characteristics of infinite cutoff single-mode transmission characteristic, dispersion characteristic, large mode field area, high nonlinearity, birefringence characteristic and the like. Ethanol liquid is doped into the fiber core, so that the temperature sensing sensitivity is improved, a better temperature sensing effect can be achieved under a smaller sensing length, and integration and miniaturization are easy.

Description

technical field [0001] The invention belongs to the technical field of sensors, in particular to a photonic crystal fiber temperature sensor and a measurement method thereof. Background technique [0002] Optical fiber temperature sensors have attracted widespread attention due to their small size, high measurement accuracy, and immunity to electromagnetic interference. However, their single structure, low birefringence and low thermal coefficient limit the further improvement of temperature sensitivity. Optical fiber temperature sensors are divided into distributed, interferometric and fiber grating temperature sensors. It is composed of light source, sensitive element, light detector, signal processing system and other parts. The basic principle is: [0003] (1) The light incident from the light source enters the modulation area. [0004] (2) When the light passes through the optical fiber in the modulation area, it interacts with the external measured parameters, so th...

Claims

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Application Information

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IPC IPC(8): G01K11/32
CPCG01K11/32
Inventor 张克非郭慧杰叶婷郜洋廖秋雨刘维光
Owner SOUTHWEAT UNIV OF SCI & TECH
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