Fiber imaging liquid-sensitive sensor

Abstract

The present invention relates to one kind of contact sensor. The fiber imaging liquid-sensitive sensor includes light supplying fiber, light returning fiber and spherical body, and the lighting point of the light supplying fiber and the sensing point of the light returning fiber are separated by some distance inside the spherical body. The present invention has high sensitivity, can bear high temperature up to 300 deg.c and high pressure up to 40 MPa, and is anticorrosive, electromagnetic interference resistant, and explosionproof. It may be used in the liquid level monitoring and control in high temperature and high pressure boiler, chemical fiber polymerizing tube, etc. and may be also developed into fiber thermometer.

Description

technical field [0001] The invention relates to a contact sensor, which is the latest type of basic device in industrial monitoring and automation systems. The automatic control system can also be developed into a new generation of fiber optic thermometer. Background technique [0002] Traditional contact sensors generally require electricity to be sent to the scene. The main disadvantages of electricity to the scene are: 1. It is not explosion-proof, because electricity can generate electric sparks to ignite the surrounding combustible gas; 2. It can produce electrolysis or ionization on the medium, resulting in corrosion of the detection electrode and pollution of the medium; 3. Can Accept electromagnetic interference, produce malfunction, etc. There is a bent optical fiber liquid sensor in foreign countries. The main disadvantages are: 1. Low sensitivity. The light beam in the bent sensor is basically the same as the tubular type in the non-bent section. In this light b...

AI Technical Summary

Problems solved by technology

The main disadvantages of electricity to the scene are: 1. It is not explosion-proof, because electricity can generate electric sparks to ignite the surrounding combustible gas; 2. It can produce electrolysis or ionization on the medium, resulting in corrosion of the detection electrode and pollution of the medium; 3. Can Accept electromagnetic interference, produce malfunction, etc.

There is a bent optical fiber liquid sensor in foreign countries. The main disadvantages are: 1. Low sensitivity. The light beam in the bent sensor is basically the same as the tubular type in the non-bent section. In this light beam, only The difference in the refractive index of the external medium can only be felt by the part of the light that can reach the outer surface of the bending section, and most of the rest of the light can only run in the fiber core without feeling the influence of the outside world, so that you can feel the influence of the outside world There is very little light, so the sensitivity is low; 2. The sensitive points are not concentrated, and the detection accuracy is poor; 3. The space occupied is large, and it is difficult to enter the small space; 4. The structure is loose and the strength is low; Pollution, etc.

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