Senor device based on fiber miniature Fabry-Perot cavity

Abstract

The present invention provides a senor device based on a fiber miniature Fabry-Perot cavity. The device comprises a broadband light source, a circulator, a sensing head and a spectrum analyzer, the sensing head is composed of corrosion multi-mode fiber, microballoon and coating glue, and the coating glue is ultraviolet glue or high-temperature glue. The a multi-mode fiber end face is subjected to corrosion to obtain a taper chamber, a microballoon is inserted into the taper chamber of the corrosion multi-mode fiber, the taper chamber is sealed by using the coating glue which has one part penetrating into the taper chamber, and the microballoon and the coating glue end face form a Fabry-Perot cavity. The circulator receives light from the broadband light source and transmits the light to the sensing head, the sensing head reflects the light to the circulator, and the light is transmitted to the spectrum analyzer through the circulator to form a similar Fabry-Perot interferometer for measuring the wavelength drift of the reflection spectral signature and calculate the values of the measured enviromental parameters. The structure is compact, the manufacturing is simple and the cost is low.

Description

technical field [0001] The invention provides a sensor device based on an optical fiber miniature Fabry-Perot cavity, which belongs to the technical field of optical fiber sensing. Background technique [0002] Compared with traditional sensors, optical fiber sensors have extremely high sensitivity and resolution, wide frequency band range, large dynamic range, and no electromagnetic field interference. It has been practically applied in medical and other scientific research fields. The development trend of sensors is sensitive, precise, adaptable, compact and intelligent. Among many fiber optic sensors, fiber optic sensors based on Fabry-Perot (F-P) cavity have developed rapidly and become an important branch of fiber optic sensor research. They are widely used in strain, stress, temperature, pressure, deformation, and vibration in structures. It can also be used for continuous real-time safety detection of physical quantities such as displacement and displacement, and ca...

AI Technical Summary

Problems solved by technology

However, this sensor is greatly affected by the coating process, so the fabrication is complex and costly; the Fabry-Perot cavity based on fiber gratings is formed by using Bragg gratings (FBGs) to form the mirror of the Fabry-Perot cavity , the narrow bandwidth characteristics of Bragg gratings can easily increase the number of multiplexed sensors

However, the grating writing process is complex, the cost is high, and the instability of its structure limits its application to a certain extent.

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