All-fiber temperature-salinity-depth sensor based on micro-nano fiber coupler interferometer

Abstract

The invention aims to overcome the defects that micro-nano optical fibers and micro-nano optical fiber couplers are relatively weak in mechanical strength and are easily influenced by pollution and anexisting temperature-salinity-depth sensor is large in size and low in precision. An all-fiber temperature-salinity-depth sensor based on a micro-nano fiber coupler interferometer is designed. The sensor is composed of a micro-nano fiber coupler, a sensor outer protective sleeve, a sensor inner protective sleeve, two sensor inner protective sleeve caps, four sensor water inlet groove sleeve caps,four sensor water purification filter elements, two reflector films, a sensor outer protective sleeve cap, an optical fiber storage groove and four filter screens. The sensor can realize high-sensitivity sensing of three parameters of seawater temperature, salinity and depth at the same time, has the performance advantages of zero electronic element, compact structure, high sensitivity, convenient integration and the like, can block the influence of plankton, seaweed, silt and the like on the performance of the sensor, and has good pressure resistance and stability.

Description

technical field [0001] The invention relates to an optical fiber sensing technology, in particular to an all-fiber temperature, salt and depth sensor based on a micro-nano fiber coupler (Opticalmicrofiber coupler, OMC) interferometer. Background technique [0002] The parameters of various elements of the marine environment directly affect marine economic development, marine environmental protection and global climate change, and are closely related to marine equipment, equipment operation efficiency and safety. For example, the distribution of seawater temperature and salinity directly determines the distribution of the oceanic layer, which in turn affects the safety of offshore and underwater platforms; in addition, dynamic environmental factors such as seawater temperature, salinity, depth, and flow velocity also directly determine the propagation of underwater sound. Features, which in turn determine the use and performance of sonar detection equipment. Therefore, real-...

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Problems solved by technology

[0008] The present invention aims at the defects of micro-nano optical fiber and micro-nano optical fiber coupler that are weak in mechanical strength and easily affected by pollution, and the existing temperature, salt and depth sensors are bulky and have low precision, and design an interferometer based on micro-nano optical fiber coupler All-fiber temperature, salt and depth sensor

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