Non-invasive pipeline pressure detection mechanism based on fiber Bragg grating

Abstract

The present invention relates to a non-Invasive pipeline pressure detection mechanism based on fiber grating. The mechanism comprises a clamp ring body clinging to an outer wall of a pipeline, a rhombic detection unit and a fiber grating; the clamp ring body comprises a first clamp body and a second clamp body which are two symmetrical semicircular structures, two opposite ends of the first clampbody and the second clamp body are provided with clamp rings connected with the rhombic detection unit, the other ends of the first clamp body and the second clamp body are provided with ear portionsconfigured to perform connection and fastening of the first clamp body and the second clamp body, each ear portion is provided with one through hole, and each through hole is internally provided withone fastener. The non-Invasive pipeline pressure detection mechanism based on fiber grating is simple in structure and convenient to mount and dismount, the clamp ring body clings to the outer wall ofthe measurement pipeline when measurement is performed, and the clamp ring body is in buckle connection with the rhombic detection unit; and moreover, the mechanism provided by the invention has goodtransmission and amplification effects on pipeline wall strain on the premise without damaging the measured pipeline wall so as to achieve an enhanced sensitivity effect, and can achieve non-Invasivedetection of internal pressure of the pipeline based on features of the high resolution and high sensitivity of the fiber grating.

Description

technical field [0001] The invention relates to the technical field of pipeline pressure detection, in particular to a fiber grating-based non-invasive pipeline pressure detection mechanism. Background technique [0002] At present, the research on pipeline pressure detection technology involves pipeline structure health detection, pipeline corrosion monitoring, and transmission pipeline leakage detection. [0003] Traditional pipeline pressure measurement is mainly based on mechanical or electrical measurement methods. The common ones are mechanical pressure gauges or resistive pressure sensors. The advantages of these methods are that the theoretical technology is mature and the equipment cost is low. However, due to their shortcomings such as poor stability and durability, short transmission distance, and insufficient anti-interference ability, they gradually cannot meet the needs of engineering applications. At the same time, the traditional pipeline pressure detection...

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Problems solved by technology

However, the strain measurement of this welded structure will be affected by the welding effect to a certain extent, and the transmission of stress and strain on the pipe wall is limited to a part between the sensing arms. At the same time, the amplification mechanism of the rhombus here is based on the strain of the four sides of the rhombus. Assuming that it is zero, there are certain limitations

[0006] Chinese patent application, the publication number is CN 105890534 A, the application date is January 19, 2015, and the application publication date is August 24, 2016. The name of the invention is a strain guide rod fiber grating sensor device on the outer wall of a high-temperature pressure pipeline. The application discloses a strain guide rod fiber grating sensor device on the outer wall of a high-temperature pressure pipeline. The core structure is an integrated structure in the form of a two-stage guide rod, which uses the principle of leverage to increase sensitivity. However, this structure is prone to stress concentration in the middle beam , the leverage sensitization effect will be weakened

At the same time, welding has certain damage to the pipe wall, which is easy to cause stress concentration. In addition, the installation and disassembly of the device is not very convenient.

[0007] Chinese patent application, the publication number is CN 104949780 A, the application date is July 16, 2015, and the application publication date is September 30, 2016. The name of the invention is a fiber grating pressure sensor for pipeline pressure monitoring. The application discloses A fiber grating pressure sensor for pipeline pressure monitoring, including a pressure transmission device, a pressure test device, a sealed casing, a fixed structure, etc., the pressure transmission device converts the external pressure into the compression change of the diaphragm center deflection, and the pressure test device converts the deflection Changes are applied to the force-measuring grating, causing the grating to shrink and the reflection wavelength to decrease, achieving the purpose of testing, but this structural design is slightly complicated and the cost is relatively high

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