SPR (Surface Plasmon Resonance) based photonic crystal fiber temperature sensor

Abstract

The invention provides an SPR (Surface Plasmon Resonance) based photonic crystal fiber temperature sensor, which is provided with a liquid core located at the center of an optical fiber and metal coating channels symmetrically distributed around the liquid core in a sensing area, wherein the liquid core can be butted with a conventional single-mode optical fiber to perform long-range detection; dual metal coating channels are adopted, the diameter of air holes between the fiber core and the metal channels is reduced, the sensing strength is effectively enhanced, the signal to noise ratio is higher, and the resonance strength of the sensor 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-optical coefficient, andthe refractive index of the material is adjusted through adjusting the mixing proportion of the liquid material. The SPR based photonic crystal fiber temperature sensor is high in sensitivity, high in signal to noise ratio, simple in structure and tiny in volume, and specific light source bandwidth and signal strength requirements can be met within a certain range through adjusting the SPR strength and the resonant 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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