Optical fiber temperature sensor based on surface plasmon resonance and strain compensation

Abstract

The invention belongs to the technical field of photoelectric detection, and presents an optical fiber temperature sensor based on surface plasmon resonance and strain compensation. A sensing fiber isa solid photonic crystal fiber. Dielectric holes of the photonic crystal fiber are distributed in a regular hexagonal shape and in multiple layers with the fiber core as the center. The inner walls of the two dielectric holes in the centers of the opposite sides of the second hexagonal dielectric hole layer from the fiber core are coated with metal films, and the metal films are made of a metal material capable of generating surface plasmon resonance. One of the dielectric holes coated with the metal films and two adjacent dielectric holes in the same layer are filled with a dielectric A, andthe refractive index of the dielectric A is negatively correlated with temperature. All the dielectric holes not filled with the dielectric A are filled with a dielectric B, and the refractive indexof the dielectric B is not affected by temperature. The problem that the accuracy of measurement results is affected by strain in temperature sensing is solved. The temperature sensor is corrosion-resistant and not susceptible to electromagnetic interference, and can be used in harsh detection environments.

Description

technical field [0001] The invention belongs to the technical field of photoelectric detection and relates to an optical fiber temperature sensor based on surface plasmon resonance and strain compensation. Background technique [0002] In many production links in petrochemical, steel, nuclear power and other industrial fields, the accurate measurement of temperature value is not only related to production quality, but also related to production safety. Because electronic temperature sensing equipment cannot be used in environments with high explosion-proof requirements, strong electromagnetic interference, and strong corrosion, and optical fiber equipment has the characteristics of intrinsic safety, anti-electromagnetic interference, and strong corrosion resistance, so optical fiber temperature sensing technology has become One of the important directions of temperature sensing. At present, fiber optic temperature sensing methods mainly use fiber gratings and fiber resonato...

AI Technical Summary

Problems solved by technology

Since the geometric size and structure of photonic crystal fiber and metal also affect the resonance wavelength, when the fiber sensor is affected by stress and strains, it will cause deviations in the temperature measurement results

However, the current fiber optic sensor based on surface plasmon resonance technology cannot eliminate the influence of strain on the measurement results.

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