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Sagnac temperature sensor based on nematic liquid crystal

A temperature sensor and sensor technology, which can be used in thermometers, thermometers, instruments, etc. with physical/chemical changes, and can solve the problems of high manufacturing difficulty, high cost, and complex structure.

Active Publication Date: 2021-12-07
YANSHAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The object of the present invention is to provide a kind of Sagnac temperature sensor based on nematic phase liquid crystal, in order to solve the problems such as complex structure, high manufacturing difficulty and high cost of existing optical fiber temperature sensor

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  • Sagnac temperature sensor based on nematic liquid crystal
  • Sagnac temperature sensor based on nematic liquid crystal
  • Sagnac temperature sensor based on nematic liquid crystal

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Embodiment Construction

[0028] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided for more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0029] Such as figure 1 As shown, in the present embodiment, a kind of Sagnac temperature sensor based on nematic liquid crystal, described sensor comprises the broadband light source BBS that is connected sequentially, and described sensor sends light to sensing unit 1 by broadband light source BBS, and spectrometer OSA receives the transmitted light The signal output by sensing unit 1.

[0030] The broadband light source BBS, th...

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Abstract

The invention discloses a nematic liquid crystal-based Sagnac temperature sensor and relates to the technical field of optical fiber application. The nematic liquid crystal-based Sagnac temperature sensor comprises a broadband light source, a Sagnac sensing unit with a built-in nematic liquid crystal and a spectrometer, wherein the Sagnac sensing unit is composed of a 2*23dB coupler, an optical fiber ferrule matching sleeve and the nematic liquid crystal; after two optical fiber jumpers are inserted into the optical fiber insertion core matching sleeve in a rotating mode, nematic phase liquid crystal molecules in the Sagnac sensing unit can be oriented in parallel along the end face of the optical fiber to become an anisotropic material, and then a Sagnac interference spectrum is formed on a spectrograph; nematic phase liquid crystal molecules are sensitive to external temperature changes, and temperature sensing can be achieved. The method is advantaged in that thickness of the injected nematic liquid crystal can be controlled by changing a gap reserved in an optical fiber insertion core matching sleeve for connecting two optical fiber jumpers in the sensing unit, the injected liquid crystal only has thickness of dozens to hundreds of micrometers, and the temperature sensor can be used for realizing temperature sensing in a micro space.

Description

technical field [0001] The invention relates to the technical field of optical fiber application, in particular to a Sagnac temperature sensor based on nematic liquid crystal. Background technique [0002] The temperature sensor is indirectly measured by changing certain characteristics of the object as the temperature changes, such characteristics are generally resistance, capacitance, electromotive force, magnetic properties, frequency, optical characteristics and thermal noise. The optical fiber temperature sensor uses the optical properties of materials to measure temperature, and can provide a temperature sensor with small size, good linearity, fast real-time monitoring response, and high sensitivity. Nematic liquid crystals are composed of rod-shaped molecules with a large aspect ratio. The spontaneous orientation of the molecular long axes parallel to each other will make the liquid crystal an anisotropic material, resulting in strong birefringence. The birefringence...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01K11/32
CPCG01K11/32
Inventor 陈海良樊晓亚陈强刘云东张赢月马明建李曙光
Owner YANSHAN UNIV
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