Metastable state inert gas atomic beam detection method and system
A technology of inert gas and atomic beam, applied in the field of metastable inert gas atomic beam detection method and system, can solve the problems of unfavorable use of lenses, high price, high requirements, etc., and achieve easy portability and assembly, simple structure and low cost low effect
Pending Publication Date: 2022-05-27
PLA PEOPLES LIBERATION ARMY OF CHINA STRATEGIC SUPPORT FORCE AEROSPACE ENG UNIV
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Problems solved by technology
[0004] In addition, for the detection of metastable inert gas atomic beams, laser-induced fluorescence detection is mainly used at present. However, laser-induced fluorescence detection has high requirements for lasers, high prices, high maintenance costs, and complex measurement systems.
At the same time, when measuring the beam spatial distribution, the detection optical path generally adopts the oblique incidence type. Due to the steric hindrance, it is not conducive to use a lens with a large numerical aperture, the fluorescence collection efficiency is not high, and the detection efficiency is low.
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Embodiment 1
[0034] A metastable noble gas atomic beam detection method, comprising the following steps:
[0035] Step 1: place a wire mesh downstream of the metastable inert gas atom beam, the metastable inert gas atoms collide with the surface of the wire mesh, de-excited to generate secondary electrons;
[0036] Step 2: De-excited electrons are focused on the microchannel plate detector under the action of the electron lens electric field;
[0037] Step 3: The microchannel plate detector will multiply the de-excited electrons and image them on the fluorescent screen;
[0038] Step 4: The image acquisition device captures the image of the phosphor screen, and through image information processing, the beam intensity and spatial distribution parameters of the metastable noble gas atomic beam are obtained.
[0039] In the above step 4, the image acquisition device may be a CCD.
[0040] In the above step 1, the atomic transmittance of the metal wire mesh is 40%-70%. The atomic transmitta...
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The invention discloses a metastable state inert gas atomic beam detection method and a metastable state inert gas atomic beam detection system, which can be used for measuring the intensity and spatial distribution of a metastable state atomic beam. According to the method, metastable state atoms are generated through radio frequency discharge, a metal wire mesh is arranged on an atom movement track, collision between the metastable state atoms and metal is utilized to enable the metastable state atoms to be de-excited to generate electrons, and the de-excited electrons are focused to an electron multiplication detector through an electron lens for detection. As the de-excitation electrons are linearly related to the related parameters of the metastable state atoms, the parameter information such as the beam intensity and the spatial distribution of the metastable state atoms can be obtained by detecting the secondary electrons. Compared with traditional laser-induced fluorescence detection, the method is higher in detection efficiency, simple in structure, smaller in device and convenient to carry and assemble.
Description
technical field [0001] The application belongs to the field of metastable noble gas atomic detection, and in particular relates to a metastable noble gas atomic beam detection method and system. Background technique [0002] Atom Trap Trace Analysis (ATTA) uses laser cooling and trapped atoms to perform highly sensitive detection of low-abundance, long-lived noble gas radioisotopes, which can be widely used in nuclear safety monitoring, geophysics and environmental science, etc. In the ATTA device, the beam intensity of metastable noble gas atoms is a key parameter affecting the loading rate and detection sensitivity of the three-dimensional magneto-optical trap. Therefore, it is necessary to accurately test and characterize the beam intensity and distribution of metastable krypton atoms. [0003] Metastable inert gas beams are usually generated by low-pressure gas discharge. According to different driving methods, they can be divided into DC, radio frequency, microwave and...
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IPC IPC(8): G01T1/29
CPCG01T1/29Y02E30/30
Inventor 冯高平洪延姬张佳乐宋俊玲饶伟
Owner PLA PEOPLES LIBERATION ARMY OF CHINA STRATEGIC SUPPORT FORCE AEROSPACE ENG UNIV