Dye-doped liquid crystal microsphere temperature sensor and manufacturing method therefor

A temperature sensor, liquid crystal technology, applied in thermometers, thermometers with physical/chemical changes, instruments, etc., can solve the problems of low sensor sensitivity and inability to meet high-precision measurement requirements, and achieve high laser quality factor, low-cost and easy-to-use equipment. Acquiring, high-sensitivity effects

Active Publication Date: 2016-11-16
HARBIN ENG UNIV
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Problems solved by technology

With the development of science and technology, in many cases, the existing cavity materials can no longer meet the high-precision measurement requirements, that is, the sensitivity of the sensor is low

Method used

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  • Dye-doped liquid crystal microsphere temperature sensor and manufacturing method therefor
  • Dye-doped liquid crystal microsphere temperature sensor and manufacturing method therefor
  • Dye-doped liquid crystal microsphere temperature sensor and manufacturing method therefor

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Embodiment Construction

[0023] combine figure 1 with figure 2 , the dye-doped liquid crystal microsphere temperature sensor of the present invention comprises liquid crystal microsphere 3, pulsed laser 7, spectrum analyzer 10 and charge-coupled device CCD11, and described liquid crystal microsphere is formed by the liquid crystal solution of DCM doping, and liquid crystal microsphere The ball is placed in the liquid environment 2 to be tested. The pulse laser 4 emitted by the pulse laser is focused by the optical lens and irradiates the surface of the liquid crystal microsphere. The interface of the measured liquid environment undergoes total internal reflection, amplification, and finally produces a whispering gallery mode laser 5 emission. The light emitted by the liquid crystal microsphere is focused by an optical lens and split by a half-transparent mirror, and a beam of light enters the spectrum analyzer for recording. Spectrum, another beam of light continues to pass through the semi-transpar...

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Abstract

The invention provides a dye-doped liquid crystal microsphere temperature sensor and a manufacturing method therefor. A cholesteric phase liquid crystal solution is doped with a fluorescent dye DCM, and the mixed solution is injected into a liquid to be measured via a tapered capillary microtubule, and a liquid microsphere cavity is formed. The fluorescent dye in a liquid crystal microsphere emits fluorescent light when being excited by a 532 nm laser pulse; high quality echo wall mode laser emission is realized due to restriction effects of a micro-cavity, and a spectrometer is used for recording laser spectrums. When ambient temperature changes slightly, change of a liquid crystal refractive index can cause change of a laser wavelength, and therefore spectrum drift can be caused; high sensitivity temperature sensing can be realized. The invention puts forward the brand new high sensitivity temperature micro-sensor device based on an optical micro-resonator cavity structure and a unique optical material.

Description

technical field [0001] The invention relates to an optical microsensor, in particular to a temperature microsensor based on fluorescent dye-doped liquid crystal microspheres. Background technique [0002] As a new generation of sensor devices, microsensors are becoming more and more popular because of their advantages of miniaturization, intelligence, and easy integration. The temperature sensor is the core part of the temperature measuring instrument, and it is widely used in industrial production and daily life. The principle of the temperature microsensor based on the optical microresonator is that the resonant spectrum generates a temperature response and converts it into an observable signal. The optical microcavity temperature sensors that have been studied have a variety of different cavity structures and are made of different materials, representatively including silica microsphere temperature sensors, fiber optic microannular cavity temperature sensors, organic pol...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01K11/20
CPCG01K11/20
Inventor 李寒阳杨军王岩刘双强
Owner HARBIN ENG UNIV
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