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An integrated field emission X-ray source

A field emission and X-ray technology, applied in the field of X-ray sources, can solve the problems of unstable emission current and low control precision, and achieve the effect of long-term working stability and life improvement, maintaining stability and high stability

Active Publication Date: 2018-12-21
广州市昊志影像科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In order to overcome the shortcomings of traditional X-ray source cathode emission current instability, low control accuracy, etc., the purpose of the present invention is to provide an integrated field emission X-ray source, which provides a fully closed-loop method to make the field emission cathode X Radiation source efficiently realizes high stability and high precision anode current solution to meet the requirements of existing imaging and analysis instruments

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0046] Please refer to figure 1 As shown, an integrated field emission X-ray source includes a field emission X-ray tube, a feedback control circuit capable of high-speed feedback modulation grid power supply and an auxiliary power supply, wherein the field emission X-ray tube includes a vacuum The container 1 and the anode target 2 and the electron gun installed in the vacuum container, the electron gun includes an emission cathode 4 and a grid 41, the emission cathode and the anode target are respectively installed at opposite ends of the vacuum container, and the grid The electrode is installed between the emitter cathode and the anode target; the anode target, emitter cathode and grid are respectively drawn out of the vacuum container through the anode target electrode 22, the emitter cathode electrode and the grid electrode 44.

[0047] The feedback control circuit includes an anode current sampling module 5, a scanning storage module 6, a nonlinear adjustment control mod...

Embodiment 2

[0067] The improvement that embodiment two carries out on the basis of embodiment one, has increased focusing lens 3 in its electron gun structure, please refer to Figure 6 and 7 As shown, a focusing lens is set between the grid and the anode target, and the focusing lens is one of a metal sleeve, a single electrostatic lens, a combination of multiple electrostatic lenses, and an electromagnetic lens; when the focusing lens is a metal sleeve, When one of a single electrostatic lens and a combination of multiple electrostatic lenses, the focusing lens is installed in the vacuum container and is located between the grid and the anode target; when the focusing lens is an electromagnetic lens, the focusing lens is installed outside the vacuum container, and Part or all of the magnetic field generated by the electromagnetic lens is located between the grid and the anode target, and the focusing lens is grounded or connected to a power supply through the focusing lens electrode 31 ...

Embodiment 3

[0070] Embodiment 3 is roughly the same as Embodiment 1, the difference is that this Embodiment 3 uses the auxiliary power supply of double-terminal positive and negative high voltage power supply, please refer to Figure 8 As shown, the connection mode of the double-terminal positive and negative high-voltage power supply is that the anode target electrode is connected to the positive high-voltage power supply, the emission cathode electrode is connected to the negative high-voltage power supply 10, and the gate is externally connected to the feedback control circuit. In this case, the gate voltage input module is suspended on the negative high-voltage power supply. The so-called suspension means that the gate voltage input module has two input terminals, one of which is connected to the output terminal of the nonlinear adjustment control module. The other input terminal is connected to the negative high-voltage power supply, that is, the negative high-voltage power supply is ...

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Abstract

The invention discloses an integrated field emission X-ray source, comprising a vacuum container, an anode target installed in the vacuum container and an electron gun, wherein the electron gun comprises an emission cathode and a grid, the emission cathode and the anode target are respectively installed at opposite ends in the vacuum container, and the grid is installed between the emission cathode and the anode target; Also included is a feedback control circuit, A feedback control circuit includes an anode current sampling module, scan memory module, A non-linear regulation control module and a gate voltage input module, The input of the anode current sampling module is connected to the anode target electrode, the input of the non-linear regulation control module is connected to the anode current sampling module and the scanning memory module, respectively, and the output of the non-linear regulation control module is connected to the gate electrode through the gate voltage input module. The invention makes the current fluctuation of the X-ray source small, and has excellent X-ray stable emission performance.

Description

technical field [0001] In the technical field of X-ray source of the present invention, in particular, the emission current of the carbon nanotube field emission cathode is controlled by adjusting the gate voltage through a feedback control circuit, so that the operating current of the field emission-based X-ray tube can always be in a highly stable state An integrated field emission X-ray source. Background technique [0002] It has been more than 100 years since the discovery of X-rays, and the role of X-rays in medical treatment and industry has been paid more and more attention. At present, the main X-ray generating device—X-ray source has been widely used in production, life and scientific research activities such as medical detection imaging, biological science, industrial non-destructive testing and material characterization. [0003] The traditional X-ray tube is a hot-cathode X-ray tube. Its basic principle is to heat the cathode to a high temperature so that the e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05G1/34H01J35/06H01J35/04
CPCH05G1/34H01J35/045H01J35/065
Inventor 汤秀清陈泽祥
Owner 广州市昊志影像科技有限公司
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