Inner wall-silver plated and liquid crystal-filled hollow optical fiber surface plasmon resonance temperature sensor

Abstract

The invention provides an inner wall-silver plated and liquid crystal-filled hollow optical fiber surface plasmon resonance temperature sensor and belongs to the optical fiber sensing technical field. According to the structure of the sensor, the interior of a hollow glass optical fiber is plated with silver, and the silver-plated hollow glass optical fiber is filled with liquid crystal; the inner diameter of the hollow glass optical fiber ranges from 300 microns to 500 microns, the numerical aperture of the hollow glass optical fiber is not lower than 0.27, and the length of the hollow glass optical fiber ranges from 30 mm to 50 mm; sensitization treatment is performed on the inner wall of the hollow glass optical fiber, and a 45nm-to 80nm uniform silver film is formed in the optical fiber through adopting a liquid phase chemical deposition method, and therefore, a sensing layer of surface plasmon resonance can be formed; and the hollow optical fiber is filled with thermotropic nematic liquid crystal, and plastic-clad multimode optical fibers are coupled to the ports of the optical fiber respectively, and end sealing processing is realized. With the inner wall-silver plated and liquid crystal-filled hollow optical fiber surface plasmon resonance temperature sensor adopted, subtle temperature changes can be dynamically monitored in real time. The inner wall-silver plated and liquid crystal-filled hollow optical fiber surface plasmon resonance temperature sensor is suitable for long-distance transmission. According to the inner wall-silver plated and liquid crystal-filled hollow optical fiber surface plasmon resonance temperature sensor, special inner wall silver plating technology is adopted, and the hollow optical fiber is filled with the thermotropic liquid crystal, and therefore, the oxidation of the external silver layer of the solid optical fiber surface plasma resonance sensor can be avoided.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, and relates to a liquid crystal-filled hollow optical fiber surface plasma resonance temperature sensor with a silver-plated inner wall. Background technique [0002] The current temperature sensors mostly use thermistors and thermocouples as sensing elements. Such sensors have low sensitivity, large measurement errors, and are susceptible to environmental interference, making it difficult to be widely used in biochemical and other fields; while optical fiber temperature sensors mostly rely on other sensitive components. Modulation function, this type of sensor has the coupling problem between the optical fiber and the sensing head, the structure is complex, and it is too sensitive to disturbances such as mechanical vibrations; although there are optical fiber temperature sensors based on the principle of surface plasmon resonance, most of them use solid optical fiber reflection prob...

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Problems solved by technology

[0002] The current temperature sensors mostly use thermistors and thermocouples as sensing elements. Such sensors have low sensitivity, large measurement errors, and are susceptible to environmental interference, making it difficult to be widely used in biochemical and other fields; while optical fiber temperature sensors mostly rely on other sensitive components. Modulation function, this type of sensor has the coupling problem between the optical fiber and the sensing head, the structure is complex, and it is too sensitive to disturbances such as mechanical vibrations; although there are optical fiber temperature sensors based on the principle of surface plasmon resonance, most of them use solid optical fiber reflection probe structures , the structure is complex, the response time is long, and the detection accuracy is poor. Although the temperature sensor filled with liquid crystal photonic crystal fiber has been reported, due to the small internal aperture of the photonic crystal fiber, the filling is difficult, the production cost is high, and other factors are difficult. widely used

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