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Temperature sensor based on grapheme-film-modified biconical micro-nano optical fiber coupler

A graphene film, temperature sensor technology, applied in the coupling of optical waveguides, thermometers with physical/chemical changes, thermometers, etc., can solve the problem of difficult to meet high-performance sensing requirements, extremely high light source stability requirements, and limited measurement range. It can achieve the effect of excellent stability and repeatability, strong anti-electromagnetic interference ability and fast response speed.

Active Publication Date: 2019-11-26
BEIHANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Traditional micro-nano optical fiber temperature sensors are limited by the singleness of materials, and it is difficult to meet the high-performance sensing requirements. Surface modification can effectively improve the performance of optical fiber sensors. Current research mostly uses liquid or gel for surface modification, which limits Extension of the measuring range
As an emerging material, graphene's special and excellent physical and chemical properties (high thermal conductivity, high electron mobility, chemical inertness, high transmittance, etc.) make it the best choice for combining with optical fibers, so in recent years Recently, graphene-based optical fiber sensor devices have received extensive attention in various fields, but there are relatively few studies on temperature sensing. The sensing method requires extremely high stability of the light source

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  • Temperature sensor based on grapheme-film-modified biconical micro-nano optical fiber coupler

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Embodiment Construction

[0024] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0025] Such as figure 1 Shown is the structure diagram of the double-tapered micro-nano fiber coupler modified by graphene film. It includes two single-mode optical fibers with a diameter of 125 μm and a core diameter of 8 μm. The coating layer in the middle part is stripped and wound with each other for 3 to 4 turns. The micro-nano fiber coupler includes a lumbar homogeneous zone 12 with a constant diameter in the middle and a first transition cone 11 and a second transition cone 13 with symmetrical diameters at both ends that change exponentially, and the lumbar uniform zone 12 is coated with a single layer of graphite ene film 14; the first transition cone region 11 has two input ports 7,8, and the second transition cone region 13 has two output ports 9,10, wherein ports 7 and 9 are the same optical fiber, and ports 8 and 10 are another On...

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Abstract

The invention discloses a temperature sensor based on a grapheme-film-modified biconical micro-nano optical fiber coupler. The device comprises a super-continuous broadband light source, a graphene-modified micro-nano optical fiber coupler sensing unit and a spectrum analyzer. The graphene-modified micro-nano optical fiber coupler sensing unit is respectively connected with the super-continuous broadband light source and the spectrum analyzer through connecting optical fibers. On the basis of the electric heating high-temperature fused biconical taper method, a biconical 2*2 micro-nano opticalfiber coupler is prepared; the central lumbar vertebra uniform area of the coupler is plated with a graphene film by using a film wet transfer method; and the sensitivity of the effective refractiveindex of the coupler intermode interference to the external environment temperature is improved by utilizing the high thermo-optic coefficient and the high thermal conductivity of the graphene film, so that the high temperature measurement sensitivity is realized. Meanwhile, the involved sensor shows the excellent linearity, repeatability and stability in experiments. The temperature sensor has advantages of being compact in structure, easy to manufacture, low in cost and easy to integrate with other optical fiber systems.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensors, in particular to a temperature sensor based on a graphene film modified biconical micro-nano optical fiber coupler, which has important significance and value for improving the sensitivity of optical fiber temperature sensors, and is suitable for long-distance sensing , anti-electromagnetic interference, has excellent linearity, repeatability and stability, and will be used in temperature sensing in many fields in the future, especially in the fields of chemistry and materials. Background technique [0002] Temperature changes seriously affect the physical / chemical properties of materials. Therefore, accurate temperature measurement is an important part of scientific research and industrial production. Aerospace, biomedicine, chemical food, basic research and other fields have very strict performance requirements for temperature measurement. At present, most of the temperature senso...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01K11/32G02B6/255
CPCG01K11/32G02B6/255
Inventor 丁铭郑少伟王波涛尹贻恒牛燕雄
Owner BEIHANG UNIV
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