A temperature sensor based on graphene film modified double-tapered micro-nano fiber coupler

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...

AI Technical Summary

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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