Pipeline magnetic flux leakage detection device based on optical fiber coupling diamond-nitrogen vacancy color center

Abstract

The invention discloses a pipeline magnetic flux leakage detection device based on an optical fiber coupling diamond-nitrogen vacancy color center. A light generator is communicated with a magneto-optical conversion part fixed on a plastic disc through an optical fiber A; the magnetizer penetrates through the plastic disc and the permanent magnets are fixed at two ends; a convex lens A, an optical filter, a convex lens B and a photoelectric conversion device are arranged behind the optical fiber B; the photoelectric conversion device and the microwave generation device are connected with the lock-in amplifier; and the microwave generating device is connected with the microwave amplifying device and the copper wire in sequence. The magneto-optical conversion part transmits optical wave signals with leakage magnetic field information out of the pipeline through the optical fiber B. The optical filter filters redundant green light, the light is focused on the photoelectric conversion part through the convex lenses A and B, the photoelectric conversion part converts optical signals into electric signals, the electric signals are analyzed, and the leakage magnetic field information is obtained. Therefore, the corresponding defect size and position of the inner wall of the detected pipeline are obtained. The method has the advantages of high sensitivity, wide application range, high spatial resolution, capability of realizing distributed measurement and the like.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, in particular to a pipeline magnetic flux leakage detection device based on optical fiber coupling diamond-nitrogen vacancy color center magnetic field sensing. Background technique [0002] Pipeline transportation is an important way to transport energy such as oil and natural gas. After long-term use of pipelines, defects such as holes and cracks will occur, resulting in energy loss. Therefore, the detection of pipeline defects has become increasingly important. Among the main technologies currently used for pipeline defect detection, magnetic flux leakage detection technology is widely used due to its high degree of automation, high detection accuracy, and low detection cost. The principle is to first use a permanent magnet to magnetize the pipeline, and a leakage magnetic field will be formed at the defect position of the pipeline, and then collect the leakage magnetic field sig...

AI Technical Summary

Problems solved by technology

It can be used in magnetic flux leakage detection to solve the problems of low sensitivity, low spatial resolution, slow response speed, and temperature interference in the measurement process of existing magnetic flux leakage detection devices.

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