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Faraday cup sensing device used in electron beam processing beam quality test

A technology of electron beam processing and Faraday cylinder, which is applied in measurement devices, radiation measurement, X/γ/cosmic radiation measurement and other directions to achieve the effects of reducing electromagnetic interference, shortening cables and improving collection efficiency

Active Publication Date: 2012-02-15
NANJING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there is still a lack of Faraday cup sensing devices for testing the beam quality of electron beam processing such as electron beam focus and power density distribution in China.

Method used

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  • Faraday cup sensing device used in electron beam processing beam quality test
  • Faraday cup sensing device used in electron beam processing beam quality test
  • Faraday cup sensing device used in electron beam processing beam quality test

Examples

Experimental program
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Embodiment

[0028] combine figure 2 , image 3 and Figure 4 . see figure 2 , the hole collecting electrode 14 of the electron beam is composed of the hole collecting electrode outer collector 12 and the hole collecting electrode inner collector 13 (the size and distance are selected and adjusted according to the needs of the actual test), the material is H62 brass, the hole collecting electrode A hole with a diameter of 2mm is placed on the center of the upper surface of the outer collector 12, and a hole with a diameter of 1.5mm is placed at the center of the inner collector 13 of the hole collecting electrode. The axes of the two holes are on the same axis, and the upper surfaces of the two holes are apart from each other. 6mm, the size of the electrode cavity is 18×12×2mm, except for the bottom wall thickness of the electrode is 5mm, the rest is 1mm, and the threaded hole M2×3mm is placed at the center of the bottom of the hole collecting electrode 14, which is used to fix the wi...

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Abstract

The invention discloses a Faraday cup sensing device used in an electron beam processing beam quality test. The Faraday cup sensing device comprises: a Faraday cup, an aluminum shell and a signal switching and amplification circuit. The Faraday cup and the signal switching and amplification circuit are arranged in the aluminum shell. The signal switching and amplification circuit is connected with an acquisition card of an industrial personal computer which is out of a vacuum chamber of an electron beam quality test system. Electron beam of the electron beam quality test system is collected by the Faraday cup and is flowed into the signal switching and amplification circuit through a cable. A weak current signal is processed by the signal switching and amplification circuit, then is converted into a digital signal by the acquisition card and is stored in the industrial personal computer. The Faraday cup comprises two electron beam aperture collection electrodes and one electron beam seam collection electrode. The aluminum shell comprises: an aluminum alloy shell and an aluminum alloy cover. By using the device, collection efficiency of the electron beam can be raised; multiple vacuum-pumping processes can be avoided. Amplifying the signal can obviously raise a signal to noise ratio.

Description

technical field [0001] The invention belongs to the technical field of electron beam processing, in particular to a Faraday cylinder sensor device for beam quality testing of electron beam processing. Background technique [0002] For an electron beam welding machine, in order to study the difference between the theoretical design and the actual electron gun, the influence of factors such as the stability of the electron gun power supply system and the change of vacuum degree on the diameter of the electron beam spot and the distribution of power density, and the effect of the size and position of the beam spot on The influence of weld seam formation needs to study the characteristics of the beam accurately, and quantitatively measure the position, diameter and distribution of the beam power density of the electron beam focus. [0003] In the existing electron beam testing technology, the Faraday cylinder type commonly used charged particle beam intensity sensing measuring i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01T1/29
Inventor 王克鸿彭勇周琦姜嘉赢田宏军张德库冯曰海黄俊
Owner NANJING UNIV OF SCI & TECH
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