Optical fiber transmission type passive pressure sensor based on gradient refractive index lens

Abstract

The invention provides an optical fiber transmission type passive pressure sensor based on a gradient refractive index lens. The problems that an existing pressure measuring device is complex in structure, large in overall size and low in measuring precision are mainly solved. The pressure sensor comprises a displacement sensing module, a C-shaped spring tube, a rotating module, a light source, an optical fiber circulator, a photoelectric conversion module and a data processing module, the displacement sensing module comprises a base, a reflecting mirror seat, a guide rail, a sliding block, a plane reflecting mirror, a lens mounting seat, a micro lens and an optical fiber; the rotating module is used for converting the deformation amount of the C-shaped bourdon tube into the displacement amount of the plane mirror on the guide rail; a light beam emitted by the light source enters the micro lens through the optical fiber circulator and the optical fiber, is transmitted to the plane mirror after passing through the micro lens and enters the optical fiber circulator again through the micro lens after being reflected by the plane mirror, and the optical fiber circulator transmits the reflected light beam to the photoelectric conversion module. The data processing module converts the optical power into a corresponding distance.

Description

technical field [0001] The invention belongs to the field of pressure measuring instruments, in particular to an optical fiber transmission passive pressure sensor based on a gradient refractive index lens. Background technique [0002] At present, the commonly used pressure measuring devices are mechanical barometers, pressure sensors and spring tube fiber grating pressure sensors. [0003] Mechanical barometers, such as spring tube gauges. In 1849, the French mechanic Bourdon invented the spring tube pressure gauge, which is one of the earliest and most widely used products in industrial automation instruments. Until today, spring tube pressure gauges are still widely used due to their small size, low cost, simple structure, easy installation, and convenient maintenance, meeting the needs of some industries. The principle of this type of pressure gauge is: the pressure changes the deformation of the spring tube in the barometer, and then uses the deformation to rotate th...

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to solve the problems of complex structure, large overall size and low measurement accuracy of existing pressure measuring devices, and to provide an optical fiber transmission passive pressure sensor based on a graded index lens

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