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1.发明申请公开(公告)号：US20190003887A1
公开(公告)日：2019-01-03
申请号：US15771338
申请日：2017-04-24
Inventor： Xiangyou LI , Meng SHEN , Zhongqi HAO , Xinyan YANG , Jiaming LI , Xiaoyan ZENG , Yongfeng LU
Abstract: The present invention belongs to the technical field of elemental analysis, and more particularly, relates to a dynamic calibration method for echelle spectrometer in laser-induced breakdown spectroscopy, comprising: S1: collecting a standard light source by using an echelle spectrometer; S2: in combination with a calibration function, calculating a pixel position coordinate ({circumflex over (x)}, ŷ) corresponding to a spectral wavelength ŵ; S3: performing dynamic searching and filtering near the pixel position coordinate ({circumflex over (x)}, ŷ) to obtain a set D of all pixel position coordinates, and adjusting all original intensity values in the set D to obtain intensity values F(Ix,y), and S4: calculating a spectral line intensity value after dynamic calibration by summing the adjusted intensity values F(Ix,y), thereby completing dynamic calibration of the result of the echelle spectrometer. The method in the present invention can overcome the shortcoming, i.e., the existing echelle spectrometer is only calibrated before measurement without solving the spectral line drift during use, increasing the absolute intensity of the wavelength and reducing the detection limit of the quantitative analysis, as well as improving the precision of the quantitative analysis of an element to be analyzed.
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Patent Agency Ranking
公开(公告)号：US20190161918A1
公开(公告)日：2019-05-30
申请号：US16092676
申请日：2018-01-24
Inventor： Xiaoyan ZENG , Qianwu HU , Pinghua GUO , Xiaoming XU , Ming JIANG , Dengzhi WANG , Chongyang LI , Li MENG
Abstract: An onsite steel rail laser processing engineering vehicle, including a laser processing power engineering vehicle and a laser processing cart, the laser processing power engineering vehicle is connected to the laser processing cart; the onsite steel rail laser processing engineering vehicle further comprises a transport mechanism disposed on the laser processing power engineering vehicle; through movement and rotation, the transport mechanism transports the laser processing cart into the laser processing power engineering vehicle or transports the laser processing cart out from the laser processing power engineering vehicle and places it on rails.
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公开(公告)号：US20160076115A1
公开(公告)日：2016-03-17
申请号：US14765516
申请日：2013-11-07
Inventor： Xiaoyan ZENG , Qianwu HU , Yinlan ZHENG , Ming JIANG , Chongyang LI , Zhao REN , Kun LI
Abstract: Provided are a method and an apparatus for laser quenching. The method takes the advantage of a high jumping speed of a scanning galvanometer, and adopts the method of heating on multiple or even high frequency repeated scans instead of on a single scan in prior art for laser quenching, wherein the laser energy is fed into the surface of a workpiece by way of short time and multiple superimposed heating, cumulatively, the laser energy absorbed by the metal base is increased and the depth of thermal conduction is improved also. The apparatus includes a laser, a control system, a light guiding system, a mechanical motion device and a scanning galvanometer. Therefore, even though the used laser power is relative high, the surface temperature of a metal object can be always restricted below its melting point and the heat can be conducted from the surface to the internal of a workpiece by thermal conduction constantly and effectively as a result of high scanning speed and the introduce of time interval at scanning, so that melting in the metal surface can be avoided, and the depth of the austenitizing region in the surface of the workpiece and the productivity of laser quenching can be significantly improved.
Abstract translation: 提供了一种用于激光淬火的方法和装置。 该方法具有扫描电流计的高跳跃速度的优点，并且采用在多次或甚至高频重复扫描中加热的方法，而不是现有技术中用于激光淬火的单次扫描，其中激光能量被馈送到 工件的表面通过短时间和多次重叠加热，累积地增加了金属基底吸收的激光能量，并提高了热传导深度。 该装置包括激光器，控制系统，导光系统，机械运动装置和扫描电流计。 因此，尽管使用的激光功率相对较高，但是金属物体的表面温度可以始终受到熔点以下的限制，并且热量可以通过热传导而从工件的表面到内部不断地有效地传导 扫描速度高，扫描时间间隔的引入，能够避免金属表面的熔融，可以显着提高工件表面的奥氏体化深度和激光淬火的生产率。
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4.发明申请公开(公告)号：US20180335388A1
公开(公告)日：2018-11-22
申请号：US16035072
申请日：2018-07-13
Inventor： Xiangyou LI , Jiaming LI , Lianbo GUO , Xiaoyan ZENG , Yongfeng LU , Zhongqi HAO , Ran ZHOU , Yun TANG , Ping YANG
CPC classification number: G01N21/718 , G01J3/10 , G01N21/6402 , G01N21/75
Abstract: The present invention belongs to the field of laser plasma emission spectrometry, and in particular relates to a method for improving the detection sensitivity on a carbon element in laser-induced breakdown spectroscopy. The method specifically comprises the following steps: ablating the surface of a sample to be tested by using a laser beam emitted so as to rapidly heat the surface of the sample and the ambient air close to the surface of the sample into plasma, atomize carbon in the sample and nitrogen in the ambient gas, and combine carbon with the nitrogen into C—N radicals; tuning a wavelength-tunable laser to a wavelength needed by stimulated absorption transition of C—N radicals, and outputting a laser beam to radiate the plasma so that stimulated absorption transition of C—N radicals is carried out, then fluorescent signals are emitted with spontaneous radiative transition; collecting and recording an emission fluorescence spectrum of the C—N radicals; and qualitatively or quantitatively analyzing on carbon element. By adopting the method provided by the invention, in a case of hardly affecting the matrix spectrum, C—N radical signal can be enhanced in high selectivity, thereby avoiding the interference generated by the matrix, and spectrum signals of the carbon element in the plasma can be enhanced, thereby improving the detective sensitivity of LIBS on carbon element.
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5.发明申请公开(公告)号：US20220203450A1
公开(公告)日：2022-06-30
申请号：US17680324
申请日：2022-02-25
Inventor： Xiaoyan ZENG , Kaiwen WEI , Youguang FAN , Mengna LIU
Abstract: A laser powder bed fusion forming device for a large-size ring/frame-shaped metal piece. Said device includes a forming cylinder, a substrate, a galvanometer array and a dust removal module. The forming cylinder is ring/frame-shaped and is adapted to the inner and outer contours of the ring/frame-shaped metal piece to be formed. The substrate is also ring/frame-shaped and is arranged inside the forming cylinder. The galvanometer array is located above the forming cylinder, includes a plurality of galvanometer systems, and the corresponding scanning areas thereof cover the upper surface of the forming cylinder. The dust removal module is located between the forming cylinder and the galvanometer array, and is used for forming a circulating air flow field which is distributed along the radial direction of the ring-shaped metal piece or along the circumscribed circle of the horizontal cross-section of the frame-shaped metal piece or along some other specific directions.
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6.发明申请METHOD FOR INHIBITING SELF-ABSORPTION EFFECT IN LASER-INDUCED BREAKDOWN SPECTROSCOPY 有权在激光诱发的断裂光谱中抑制自吸收效应的方法公开(公告)号：US20170010215A1
公开(公告)日：2017-01-12
申请号：US15182371
申请日：2016-06-14
Inventor： Lianbo GUO , Jiaming LI , Xiangyou LI , Xiaoyan ZENG , Yongfeng LU , Rongxing YI , Xinyan YANG , Zhongqi HAO
IPC: G01N21/71
CPC classification number: G01N21/718 , G01N21/71 , G01N2201/06113
Abstract: Provided is a method for inhibiting self-absorption effect of a LIBS, comprising ablating a to-be-measured sample via a pulse laser thereby generating plasma, and selectively stimulating the plasma using a wavelength-tunable laser beam enabling transition of particles in a ground-state in the plasma to high energy state as stimulated absorption, thereby improving a stimulated absorption transition efficiency of the particles in a ground-state, and preventing plasma spectrum from being influenced by self-absorption effect. The invention is capable of eliminating the self-absorption effect without introducing external interference, obtaining original characteristics of emission spectrum from the center of the plasma, and essentially inhibiting and finally eliminating the self-absorption effect of laser plasma by making use of intrinsic physical property of plasma.
Abstract translation: 本发明提供一种抑制LIBS自吸收效应的方法，包括通过脉冲激光烧蚀待测样品从而产生等离子体，以及使用波长可调的激光束选择性地刺激等离子体，使得能够在地面中转移颗粒 - 将等离子体状态置于高能态作为受激吸收，从而提高基态中颗粒的刺激吸收转变效率，并防止血浆光谱受自吸收效应的影响。 本发明能够在不引入外部干扰的情况下消除自吸收效应，从等离子体的中心获得发射光谱的原始特性，并且通过利用固有的物理性质基本上抑制并最终消除激光等离子体的自吸收效应 的等离子体。
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