Thin core optical fiber mode interferometer sensor

Abstract

The invention belongs to a thin core optical fiber mode interferometer sensor; the existing optical fiber mode interferometer sensor has the advantages that the manufacturing process is complex, the raw material is special and the mechanical intensity is low; the thin core optical fiber mode interferometer sensor comprises a standard single-mode fiber, a thin core single-mode fiber, a reflecting film, a broad band light source, a spectrum analyzer and a circulator; the broad band light source is optically connected with the I port of the circulator by the standard single-mode fiber, the spectrum analyzer is optically connected with the III port of the circulator by the standard single-mode fiber, one end of the thin core single-mode fiber is optically connected with the II port of the circulator by the standard single-mode fiber and the other end thereof is provided with the reflecting film with thickness of d, wherein d is more than or equal to 100mum and is less than or equal to 200mum, and the standard single-mode fiber and the thin core single-mode fiber which are connected are arranged coaxially; the sensor has simple manufacturing process and low cost.

Description

technical field The invention belongs to the technical field of optical fiber sensing, and in particular relates to a thin-core optical fiber mode interferometer sensor, which can be used in the fields of biomedicine, chemical detection, and environmental monitoring to detect various substances such as antibody-antigen, chemical reagent concentration, and sewage pH and features. Background technique Optical fiber sensor is a new type of sensor. Compared with traditional sensors, it has the advantages of small size, light weight, anti-electromagnetic interference, high sensitivity, corrosion resistance, etc., especially the all-fiber sensor, which is convenient to form a telemetry network with an optical fiber transmission system, and can be used in harsh and dangerous environments. down to work. According to whether the optical fiber sensor is based on the grating structure, the optical fiber sensor can be divided into a fiber grating sensor and a non-grating optical fiber...

AI Technical Summary

Problems solved by technology

However, the existing fiber-optic mode interferometers have disadvantages such as complex manufacturing process, special raw materials, and low mechanical strength.

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