Angle adjustable multichannel optical fiber surface plasmon resonance sensing probe

Abstract

The invention relates to an angle adjustable multichannel optical fiber surface plasmon resonance sensing probe and belongs to the technical field of biochemical detection and optical fiber sensing. The angle adjustable multichannel optical fiber surface plasmon resonance sensing probe is characterized by consisting of surface plasmon resonance (SPR) sensing surfaces and a reflective surface; the opposite SPR sensing surfaces and the reflective surface form an included angle of 90 degrees, and form a sensing channel; a Cr membrane with the thickness of between 2 and 7 nanometers is adhered to an optical fiber core tightly and is plated on each SPR sensing surface, and an Au membrane or an Ag membrane which is 35 to 65 nanometers thick is adhered to the Cr membrane tightly and is plated on each SPR sensing surface; the Au membrane or the Ag membrane is plated on the reflective surface to form a micro-reflector; and an angle of each SPR sensing surface relative to an optical fiber axis is adjustable, a plurality of groups of SPR sensing surfaces which are complementary mutually and the reflective surface concentrate at one end of the same optical fiber and meet at a point to form a multi-surface pyramid structure, and a plurality of groups of SPR sensing surfaces generate surface plasmon resonance sensing simultaneously. The angle adjustable multichannel optical fiber surface plasmon resonance sensing probe has the advantages that: incidence angles in the optical fibers can be controlled to realize the portable and parallel detection of multichannel multi-parameter; and the application value is high.

Description

technical field [0001] The invention belongs to the technical fields of biochemical detection and optical fiber sensing. It relates to the design of a multi-channel, high-sensitivity optical fiber surface plasmon resonance (SPR) sensor and the implementation method of eliminating environmental interference such as temperature and humidity, and is especially suitable for various Real-time detection and alarm of gas and liquid. Background technique [0002] The Surface Plasmon Resonance (SPR) sensor is a new type of photoelectric detection technology. Its key detection part is a sensitive area based on the surface plasmon resonance effect. When the incident light meets certain conditions, it will cause metal free electrons The resonance, so that the reflected light is greatly weakened to achieve the sensing effect. Compared with traditional sensors, it has the advantages of simple equipment, high sensitivity, good stability, and fast response. It has been widely used in many...

AI Technical Summary

Problems solved by technology

However, most of the current optical fiber SPR sensing probes are the implementation of the SPR sensing area on the side of the optical fiber, and the corresponding detection spectrum is mostly the cumulative spectrum of broadband light at various incident angles in the optical fiber, half-peak width and resonance signal intensity None of them are ideal, and there is no fiber surface plasmon resonance sensor with adjustable incidence angle and controllable implementation on the fiber end face.

In addition, the existing optical fiber SPR signal is easily affected by the environment such as temperature and humidity, and there is no good solution for eliminating background interference and multi-channel detection

Although there have been implementations of probes in the form of multiple sensing fibers combined for multi-channel detection, multi-channel and multi-parameter simultaneous detection can be achieved on the same optical fiber, especially by adjusting the incident angle of the sensing beam in the optical fiber. There are few reports on the implementation of multi-channel parallel detection

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