A high-sensitivity scanning low-frequency electromagnetic sensor for ferromagnetic material damage detection
A technology of electromagnetic sensors and ferromagnetic materials, applied in the fields of magnetic field measurement, material magnetic variables, and magnetic measurement environment using electromagnetic devices, can solve the problems of small influence of skin effect, single detection signal, and damage to ferromagnetic materials. Achieve the effect of small influence, high signal-to-noise ratio, and stable detection signal
Active Publication Date: 2019-05-17
BEIJING UNIV OF TECH
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Problems solved by technology
On this basis, the development of a low-frequency electromagnetic sensor with a single detection signal, less affected by the skin effect, hand-held scanning, and less affected by the scanning speed is of great significance for solving the problem of ferromagnetic material damage detection.
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[0052] Attached below figure 1 ~ attached Figure 19 The design of a high-sensitivity scanning low-frequency electromagnetic sensor is further explained.
[0053] Based on the principle of low-frequency electromagnetic detection, a high-sensitivity scanning low-frequency electromagnetic sensor is designed to detect and identify cracks and corrosion damage on the inner and outer walls of ferromagnetic equipment.
[0054] A high-sensitivity scanning low-frequency electromagnetic sensor, its structure is as follows figure 1 As shown, it includes a sensor housing 1, a regulated power supply 2, a lead connector 3, an excitation coil 4, a magnetic core 5, a magnetic shielding layer 6, a magnetic sensitive element 7, and a bearing roller 8. It is characterized in that the regulated power supply 2 is fixed on the sensor In the top groove of the shell 1; the excitation coil 4 is wound on the magnetic core 5, and is fixed inside the sensor shell 1 as a whole, and the bottom of the mag...
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Abstract
The invention discloses a high-sensitivity scanning type low-frequency electromagnetic sensor for ferromagnetic material damage detection and belongs to the non-destructive detection field. The sensor is mainly composed of a voltage stabilized power source, a lead connector, an excitation coil, a magnetic core, magnetic shielding layers, a magnetic sensitive component, bearing rollers and a package shell; and the shape and the size of the magnetic core, the number of turns of winding, winding length and position, the thickness of the magnetic shielding layers and the number of the magnetic shielding layers are optimized according to the change rule of detection signals, and therefore, the uniformity of a magnetic field in a detection area can be ensured, a leakage magnetic field is made to be strong as much as possible, so that highest signal strength and detection sensitivity can be realized, and the accurate positioning and identification of defects can be realized. Compared with a conventional magnetic leak sensor, the low-frequency electromagnetic sensor has the advantages of optimized structure, small size, light weight and hand-held scanning, and is just slightly influenced by scanning speed. The low-frequency electromagnetic sensor is stable in detection signals and high in signal strength and sensitivity, and can achieve continuous real-time detection of in-service equipment.
Description
technical field [0001] The invention relates to a low-frequency electromagnetic sensor, especially a high-sensitivity scanning sensor based on eddy current and magnetic flux leakage detection technology, which is used for detecting cracks and corrosion defects on the inner and outer walls of ferromagnetic equipment, and belongs to the field of non-destructive testing. Background technique [0002] Ferromagnetic materials are widely used in pressure-bearing equipment in the fields of petroleum, chemical industry, and electric power because of their high strength, good plasticity, impact resistance, and reliable performance. For example, boilers and pressure vessels in industrial production, pressure pipes and storage tanks in petrochemical industry are all based on ferromagnetic materials. During its service, due to the combined effects of the external environment and the internal bearing medium, the inner and outer walls of the pressure equipment are prone to various damages...
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IPC IPC(8): G01R33/06G01R33/00G01N27/82G01N27/90G01N27/83
CPCG01N27/82G01N27/83G01N27/90G01R33/007G01R33/06
Inventor 焦敬品常予李光海吴斌何存富
Owner BEIJING UNIV OF TECH