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Impulse excitation electromagnetic resonance safety inspection method and device

A technology of electromagnetic resonance and pulse excitation, which is applied to measurement devices, material analysis by electromagnetic means, material analysis by microwave means, etc. damage effect

Inactive Publication Date: 2005-04-06
TSINGHUA UNIV
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Problems solved by technology

Some of these patents have been transformed into mature products, such as security inspection devices widely used at the entrances of stations, docks, airports and other places. These devices all use X-ray perspective imaging technology. It will also cause certain harm and damage to organisms and photosensitive materials such as film during normal work.

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  • Impulse excitation electromagnetic resonance safety inspection method and device
  • Impulse excitation electromagnetic resonance safety inspection method and device
  • Impulse excitation electromagnetic resonance safety inspection method and device

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Embodiment Construction

[0019] The present invention will be further described below in conjunction with the accompanying drawings.

[0020] figure 1 The schematic diagram of the method. The space magnetic field 10 connects the excitation part and the detection part together, the excitation coil 20 is excited by the transient high-energy impulse through the transistor switch 30 by the control signal generated by the excitation source 40, and the excitation signal establishes a resonance attenuation magnetic field in space, that is, the space magnetic field. 10. The duty cycle of the control signal determines the initial pulse width of the excitation signal, and then controls the maximum value of the excitation signal, that is, the maximum value of the resonance attenuation magnetic field. Among them, the excitation energy input terminal adopts a DC voltage greater than or equal to 5V; due to the limitation of the coil stored energy, when the duty cycle increases to more than 10%, the maximum value ...

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Abstract

This invention is based on electromagnetism lossless measurement theory and provides an impulse exciting electromagnetism resonance safety measurement method and its apparatus and belongs to electromagnetism lossless measurement technique field. This invention adopts transient high-energy impact excitation loop and establishes an attenuation resonance magnetism field. The detection loop is used to feel space magnetism field excitation and is connected with the alarming circuit through signal process circuit.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic nondestructive testing. Background technique [0002] There have been many patents for safety inspection applied at home and abroad, but most of them use the high transmission characteristics of X-rays or γ-rays, such as a γ-radioactive safety detection device disclosed in the Chinese patent application No. The highly integrated low-energy X-ray array sensing device disclosed in Chinese Patent No. 99100298.9, the multifunctional industrial X-ray imaging system disclosed in Chinese Patent Application No. 99113199.1, and the portable X-ray fluoroscopy recorder disclosed in Chinese Patent No. 90103530.0 Wait. Some of these patents have been transformed into mature products, such as security inspection devices widely used at the entrances of stations, docks, airports and other places. These devices all use X-ray fluoroscopic imaging technology. In addition to the complex structure and high co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N22/00G01N27/00
Inventor 李路明文雄伟郝红伟曹益平黄刚
Owner TSINGHUA UNIV
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