Reflection-type optical fiber temperature sensor

Abstract

The invention discloses a reflection-type optical fiber temperature sensor, which comprises a bushing, a sapphire isosceles right angle triple prism arranged at one end of a bushing and a convex lens arranged at the other end of a bushing. The inclined edge face of the sapphire isosceles right angle triple prism is C axis orientation, faces the inner side of the bushing and is provided with a ZnO thin film. The optical axis of the convex lens is vertical to the inclined edge face of the sapphire isosceles right angle triple prism. The intersection point of the convex lens and the inclined edge face of the sapphire triple prism is approximately located at the inclined edge face center of the sapphire triple prism. The convex lens is provided with optical fibers for transmitting light rays opposite to the other side of the sapphire isosceles right angle triple prism. The end planes of the optical fibers are located at the focus of the convex lens. The temperature measurement range of the optical fiber temperature sensor is 0 to 1800k. The invention has the advantages of simple structure, convenient operation, low cost, wide measurement range and good measurement accuracy and stability.

Description

technical field [0001] The invention relates to the field of optical fiber sensing, in particular to a reflective optical fiber temperature sensor. Background technique [0002] Optical fiber temperature sensors have broad application prospects in industrial production, aerospace and other fields. Its probe and instrument are separated, and optical fiber is used as the optical path, which can perform non-contact, non-destructive and long-distance measurement in harsh environments, which increases the environmental adaptability of the sensor and takes advantage of the advantages of optical fiber itself, such as long distance Low loss, easy to bend, small size, light weight, low cost, waterproof, fireproof, corrosion resistance, anti-electromagnetic interference, etc. At the same time, it is also easy to connect with a computer to realize intelligent and long-distance monitoring. In many cases, it can complete tasks that are difficult or even impossible for traditional sensor...

AI Technical Summary

Problems solved by technology

However, this kind of fiber optic temperature sensor needs to be coupled with ordinary quartz fiber in actual temperature measurement, and there are inevitably many end face losses, which reduces the total coupling efficiency.

In addition, since the optical fiber temperature sensor adopts a transmissive optical path, in actual measurement, the light source and light detection device must be placed separately at both ends of the sensor. Portable product that can be placed freely in the required temperature measurement environment

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