Fabry-Perot sensor based on silicon core optical fiber and preparation and application thereof

Abstract

The invention relates to the technical field of optical fiber sensing, in particular to a Fabry-Perot sensor based on a silicon core optical fiber and a preparation method thereof. The Fabry-Perot sensor based on the silicon core optical fiber comprises a common single mode optical fiber, an optical fiber fusion end face, the silicon core optical fiber and a polished end face, wherein an input optical fiber and the silicon core optical fiber are fused to form a fusion end face, the silicon core optical fiber consists of a silicon core optical fiber cladding and a silicon core optical fiber core, the polished end face is formed by grinding and polishing the end face of the silicon core optical fiber, and the fusion end face and the polished end face form two mirror faces of a silicon core optical fiber Fabry-Perot cavity. The Fabry-Perot sensor based on the silicon core optical fiber prepared by the invention has high temperature sensitivity, laser power sensitivity and response speed,and the Fabry-Perot sensor based on the silicon core optical fiber also has the advantages of simple structure, easiness in manufacturing, good repeatability and the like.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensing, in particular to a silicon-core optical fiber-based Fabry-Perot sensor and its preparation and application. Background technique [0002] With its small size, anti-electromagnetic interference, high precision and other advantages, fiber optic sensors have been widely used in aerospace, medical and health, agricultural science and other fields, and can be used to detect various physical quantities, such as temperature, pressure, wind speed, power, humidity , Refractive index, etc. [0003] Common fiber optic temperature sensors include fiber Bragg gratings, long period fiber gratings, Mach-Zehnder interferometers and Fabry-Perot interferometers. Limited by the low thermo-optic coefficient and thermal expansion coefficient of fused silica, the temperature sensitivity of conventional fiber optic sensors has a certain upper limit. For example, the temperature sensitivity of fiber Bragg...

AI Technical Summary

Problems solved by technology

At present, many fiber optic sensors are made based on fused silica, limited by the thermo-optic coefficient and thermal expansion coefficient of fused silica, the temperature sensitivity of such sensors is generally small

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