Capillary tube-based optical fiber SPR sensor with temperature compensation

Abstract

The invention discloses an optical fiber SPR sensor with temperature compensation based on a capillary tube, and belongs to the technical field of optical fiber sensing. Comprising a light source 1, a light injection optical fiber 2, a sensing area 3, a light receiving optical fiber 4, a spectrograph 5 and a computer 6, the light injection optical fiber and the light receiving optical fiber are quartz multimode optical fibers 7 and are respectively connected to two ends of the capillary 8 through a welding machine, the other two ends of the capillary 8 are connected with a light source and a spectrograph, 50nm gold films are plated on the upper surface and the lower surface of the capillary which is laterally thrown to a hollow core, PDMS is placed on the upper surface, and the lower surface is in contact with to-be-measured liquids with different refractive indexes. The light generates SPR effect on the capillary cladding and the metal interface and is generated by different refractive indexes of the liquid to be detected and the PDMS, so that the refractive index with temperature compensation of the liquid to be detected can be detected. The device can be used for measuring the refractive index of the liquid with temperature compensation, and can be widely applied to the fields of biosensing, environmental monitoring and the like.

Description

(1) Technical field [0001] The invention belongs to the technical field of optical fiber sensing, in particular to a capillary-based optical fiber SPR sensor with temperature compensation. (2) Background technology [0002] The measurement of refractive index plays an important role in many scenarios, including medical diagnosis, environmental monitoring and food safety, etc. Surface plasmon resonance (SPR) is a very sensitive technology that can detect small changes in the refractive index, and can also further measure changes in physical quantities such as temperature and pressure by measuring changes in the refractive index. Compared with conventional prism-based SPR sensors, fiber-based SPR sensors have the advantages of small size, low cost, and easy fabrication. At present, there are various kinds of optical fiber SPR sensors with different structures. [0003] As a simple cylindrical light-guiding structure, the capillary is composed of a hollow part and a quartz tu...

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Problems solved by technology

The Chinese invention patent of patent application number 202011304034.1 "A temperature-compensated SPR sensor with a large measurement range and its production and use method" provides a temperature-compensated SPR sensor with a large measurement range, but this structure uses coaxial dual-waveguide optical fibers, Partial three-core optical fiber, multimode optical fiber and other optical fibers are difficult to process, complex in structure and high in cost

The Chinese invention patent "capillary structure localized surface plasmon resonance biochemical sensor" with patent application number 201810784994.9 provides a capillary structure localized surface plasmon resonance biochemical sensor, but this structure does not have temperature compensation, which will affect the measurement results

The Chinese invention patent "a capillary surface plasmon resonance sensor" with patent application number 201210097543.0 provides a capillary surface plasmon resonance sensor, and this structure also does not have temperature compensation

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