A spr-based photonic crystal fiber optic temperature sensor

Abstract

The invention provides an SPR-based photonic crystal fiber temperature sensor, which has a liquid core located in the middle of the optical fiber and metal coating channels symmetrically distributed around the liquid core in the sensing area. The liquid core can be docked with conventional single-mode optical fiber for long-distance detection; the dual metal coating channel is used, and the diameter of the air hole between the fiber core and the metal channel is reduced, which effectively enhances the sensing intensity, the signal-to-noise ratio is stronger, and the sensor resonates The intensity can reach up to 327dB / cm; the fiber core and the two metal coating channels are filled with a liquid material with a high thermo-optic coefficient, and the refractive index of the material is adjusted by adjusting the mixing ratio of the liquid material. The SPR-based photonic crystal fiber temperature sensor of the present invention has high temperature sensitivity, high signal-to-noise ratio, simple structure, and small size, and can meet specific light source bandwidth and signal intensity requirements within a certain range by adjusting SPR intensity and resonance wavelength.

Description

technical field [0001] The invention belongs to the technical field of intelligent communication, and in particular relates to an SPR-based photonic crystal fiber temperature sensor. Background technique [0002] In recent years, with the development of technologies such as intelligent communication and wireless networks, sensors, as an extension of human facial features, play a very important role in industrial production and daily life. Due to light diffusion and other reasons, traditional photoelectric sensors cannot accurately control light collection, resulting in poor accuracy. The optical fiber sensor transmits light through the optical fiber cable, which improves the concentration of the beam and has a high detection accuracy; and the optical fiber sensor has a fast measurement speed, a large information capacity, anti-electromagnetic interference, electrical insulation, corrosion resistance, and is suitable for various harsh environments. In addition, the optical f...

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Problems solved by technology

[0004] In the prior art, when the surface plasmon resonance (Surface Plasmon Resonance, SPR) based photonic crystal fiber sensor monitors the temperature, the silicon dioxide, which is the constituent material of the fiber, is less sensitive to temperature, so other means are needed to monitor the temperature. Enhancing Fiber Sensitivity to Temperature

[0005] At the same time, the scope of application and temperature sensitivity of the general fiber-optic SPR temperature sensor is not high, and most of the existing photonic crystal fiber designs adopt multi-core and multi-channel design, the structure is complex, and the original structure of the photonic crystal fiber has been greatly changed. It is difficult to manufacture, complex design such as multi-core makes it difficult to connect with conventional single-mode optical fiber, and the structural complexity is not high enough to improve the sensitivity, etc.

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