Micro optical fiber subminiature temperature sensor based on spherical cone serial structure

Abstract

The invention relates to a micro optical fiber subminiature temperature sensor based on a spherical cone serial structure, and belongs to the technical field of optical fiber sensing.The subminiature temperature sensor comprises a light source, an optical fiber module and a spectrum detector; the optical fiber module further comprises first coupling optical fiber, micro optical fiber and second coupling optical fiber, the micro optical fiber is one-dimensional micro optical fiber which is formed by arc discharging and is of the spherical cone serial structure and comprises an optical fiber microsphere, an optical fiber cone and a spherical cone connecting region, a cladding part of the optical fiber microsphere and a cladding part of the optical fiber cone are connected, a fiber core part of the optical fiber microsphere and a fiber core part of the optical fiber cone are disconnected, and a Fabry-Perot interferometer is formed in this way to detect environment temperature at high sensitivity and stability.The detection sensitivity of the micro optical fiber subminiature temperature sensor based on the spherical cone serial structure can reach 17.24 pm / DEG C, and the micro optical fiber subminiature temperature sensor has the advantages of being subminiature in size, light in weight and low in loss and having huge 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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