High-sensitivity optical fiber temperature sensor, manufacturing method and temperature measuring device thereof

Abstract

The invention relates to a high-sensitivity optical fiber temperature sensor, a manufacturing method and temperature measuring device thereof. According to the temperature sensor, a single-mode optical fiber is processed into an induction contact and then the contact extends into a hollow capillary tube, and finally UV glue is added dropwise for curing to form an FP cavity. The FP cavity is a thinfilm formed after UV glue is solidified, the thickness of the FP cavity changes according to a certain rule along with temperature changes, the change of the thickness of the FP cavity can cause thechange of the optical path difference between first reflected light and second reflected light, so that the interference phenomenon of the two beams of light changes. The temperature near the sensor is indirectly obtained by collecting information carried by interference light. According to the invention, the temperature can be measured by using the thermal expansion coefficient of the UV glue, and the high-sensitivity optical fiber temperature sensor has characteristics of high measurement precision, simple structure and low cost.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensor manufacturing and application thereof, in particular to a high-sensitivity optical fiber temperature sensor, a manufacturing method thereof, and a temperature measuring device. Background technique [0002] In the past 30 years, fiber optic sensors have unique advantages such as anti-electromagnetic interference, high sensitivity, high integration, easy networking, and intrinsic safety, and have become a research hotspot in the field of sensing. However, the traditional all-fiber sensing structure is not sensitive to changes in external environmental parameters such as temperature, inclination angle, and electric field due to the limitations of the inherent properties of the fiber material itself, such as low thermo-optic coefficient, low thermal expansion coefficient, and high Young's modulus. In recent years, in order to meet the requirements of the development of modern science and...

AI Technical Summary

Problems solved by technology

At present, the temperature measurement technology based on all-fiber FPI and fiber grating sensors is very mature, but its response sensitivity is limited to the level of optical fibers, and the production cost is relatively high.

In addition, although the known optical fiber sensing structures that introduce sensitizing materials into the optical fiber microstructure significantly improve the sensitivity of the optical fiber temperature sensing structure, most of them are difficult to manufacture and the cost is extremely high

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