Online transmission multi-core optical fiber SPR sensor

Abstract

The invention discloses an online transmission multi-core optical fiber SPR sensor. The sensor comprises a quartz tube, wherein multiple single-core optical fibers for input, a multi-core optical fiber, multiple single-core optical fibers for output and multi-core optical fiber SPR sensing elements are arranged in the quartz tube, and the number of the single-core optical fibers for input and output is the same as the number of fiber cores of the multi-core optical fiber; multi-core optical fiber coupling elements are arranged at one end of each of the multiple single-core optical fibers for input and output and the two ends of the multi-core optical fiber respectively, and the multi-core optical fiber coupling elements are connected in a waveguide directional coupling mode to form a connection region of the single-core optical fibers and the multi-core optical fiber; and a coating of the middle section of the multi-core optical fiber is removed, exposed fiber cores are plated with a metal film and different sensitive substances to form an SPR sensing region, and each fiber core forms one independent SPR sensing element. Through the sensor, the SPR sensitive elements can be coatedwith corresponding sensitive substances according to the demand of a user, and the sensor can be applied to online real-time measurement in multiple fields such as biosensing, chemical analysis, drugresearch and development and environment monitoring.

Description

technical field [0001] The invention relates to sensor technology, belongs to the field of information, and specifically relates to an online transmission multi-core optical fiber SPR sensor that can be applied to multiple fields such as biological sensing, chemical analysis, drug research and development, and environmental monitoring. Background technique [0002] Surface Plasmon Resonance (SPR) is a physical phenomenon that occurs at the interface between a metal layer and a dielectric layer. This phenomenon is very sensitive to the refractive index of the material. Generally, the measurement results are very accurate for substances with a refractive index between 1.3 and 1.4. But for substances with the same refractive index, SPR cannot effectively distinguish them. In order to realize the detection of the characteristic substance, a layer of sensitive substance that interacts with the characteristic substance can be coated on the metal film. As long as the characteris...

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Problems solved by technology

[0004] The technical problem to be solved in the present invention is to provide an online transmission multi-channel optical fiber SPR sensor with single-core optical fiber and multi-core optical fiber directional coupling for the shortcomings of the above-mentioned multi-channel optical fiber SPR sensor and the difficulty in optical coupling of multi-core optical fibers

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