Micro-fiber ultra-miniature temperature sensor based on spherical-cone series structure

Abstract

The invention relates to a micro-fiber ultra-small temperature sensor based on a spherical-cone series structure, belonging to the technical field of optical fiber sensing. It includes a light source, an optical fiber module and a spectral detector; the optical fiber module further includes a first coupling fiber, a micro fiber and a second coupling fiber; the micro fiber is a one-dimensional micro Optical fiber, including fiber microsphere, fiber cone and spherical cone connection area, the cladding part of the fiber microsphere and the cladding part of the fiber cone are connected to each other, while the core part of the fiber microsphere and the core part of the fiber cone are not connected to each other, which constitutes A Fabry-Perot interferometer for high sensitivity and stable detection of ambient temperature. The detection sensitivity of the micro-fiber ultra-miniature temperature sensor based on the spherical-cone series structure provided by the invention can reach 17.24pm / °C, and has the characteristics of ultra-small volume, light weight, and low loss; and has great market application prospects.

Description

technical field [0001] The invention relates to an optical fiber temperature sensor, in particular to a micro-fiber ultra-small temperature sensor based on a spherical-cone series structure, belonging to the technical field of optical fiber sensing. Background technique [0002] In recent years, temperature sensors have been widely used in fields such as oil exploration, food safety, environmental quality detection and biomedicine. As a key component for detecting temperature parameters, the temperature sensor mainly detects the ambient temperature and converts the temperature information into relevant physical parameters, so as to detect, monitor, analyze and alarm the temperature. Today, sensors are developing in the direction of sensitivity, precision, adaptability, compactness and intelligence; fiber optic sensing, as a high-tech combination of fiber optics, microelectronics, precision machinery and information transmission, has attracted much attention. . The basic wo...

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Problems solved by technology

At present, there are relatively few studies on temperature sensors with low-cost and simple structures. U.S. Patent US6865194B1, Korean Patent 1993-0006932 and Chinese Patent CN201120381879 respectively disclose three schemes of optical fiber temperature sensors. temperature detection, but since the fabrication of fiber Bragg gratings usually requires the use of phase mask technology and ultraviolet laser writing, the cost is relatively high, and the manufacturing process is quite complicated, which is very unfavorable for the general promotion of market applications. The research and development of new fiber optic temperature sensor has become a top priority

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