Temperature sensor based on microstructured optical fiber and its preparation method and temperature measuring device

Abstract

The invention is applicable to the technical field of temperature sensors, and provides a temperature sensor based on a microstructure optical fiber, a preparation method thereof, and a temperature measuring device. The temperature sensor includes at least two sections of microstructured optical fiber, and the adjacent two sections of microstructured optical fiber are connected in series through multimode optical fiber; among the core and the cladding of the microstructured optical fiber, at least the cladding has a There are air holes distributed in the air holes, and there are quantum dot materials in the air holes, and the wavelengths of fluorescence emitted by the quantum dot materials in each section of the microstructure optical fiber are different. Compared with ordinary fluorescent materials, quantum dots have the characteristics of wide excitation wavelength, adjustable fluorescence wavelength, and stable fluorescence intensity. By adding quantum dots of different types or sizes to each section of microstructured optical fiber, it is possible to distinguish each section of microstructured optical fiber according to the different fluorescence wavelengths in the wavelength domain, thereby realizing quasi-distributed sensing.

Description

technical field [0001] The invention belongs to the technical field of temperature sensors, and in particular relates to a temperature sensor based on a microstructure optical fiber, a preparation method thereof, and a temperature measuring device. Background technique [0002] Fluorescence parameters of fluorescent materials are related to temperature, such as fluorescence intensity, intensity ratio, wavelength and lifetime are functions related to temperature, so temperature can be measured by monitoring related fluorescence parameters. However, the fluorescent wavelength range of ordinary fluorescent materials is wide and the adjustable range is narrow, which limits the application of optical fiber sensors based on ordinary fluorescent materials in distributed sensing, and the fluorescence intensity of ordinary fluorescent materials is weak, especially when the excitation light is irradiated for a long time. Under these circumstances, the fluorescent material will produce...

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Problems solved by technology

However, the fluorescent wavelength range of ordinary fluorescent materials is wide and the adjustable range is narrow, which limits the application of optical fiber sensors based on ordinary fluorescent materials in distributed sensing, and the fluorescence intensity of ordinary fluorescent materials is weak, especially when the excitation light is irradiated for a long time. Under this condition, the fluorescent material will produce photobleaching phenomenon, resulting in a significant decrease in fluorescence intensity, reducing the sensitivity of the sensor

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