WO2016107437A1 - 用于离子迁移谱仪的电极环、离子迁移管、离子迁移谱仪 - Google Patents

用于离子迁移谱仪的电极环、离子迁移管、离子迁移谱仪 Download PDF

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WO2016107437A1
WO2016107437A1 PCT/CN2015/098077 CN2015098077W WO2016107437A1 WO 2016107437 A1 WO2016107437 A1 WO 2016107437A1 CN 2015098077 W CN2015098077 W CN 2015098077W WO 2016107437 A1 WO2016107437 A1 WO 2016107437A1
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electrode ring
ion
outer edge
thickness
edge thickness
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PCT/CN2015/098077
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English (en)
French (fr)
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周海朝
张阳天
包云肽
吴汪洋
肖翼
陈昶卓
王启方
贺文
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同方威视技术股份有限公司
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Priority to EP15875115.6A priority Critical patent/EP3242317A4/en
Publication of WO2016107437A1 publication Critical patent/WO2016107437A1/zh

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/62—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating the ionisation of gases, e.g. aerosols; by investigating electric discharges, e.g. emission of cathode
    • G01N27/622—Ion mobility spectrometry
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J49/00—Particle spectrometers or separator tubes
    • H01J49/02—Details
    • H01J49/06—Electron- or ion-optical arrangements

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  • the invention relates to an electrode ring, an ion transfer tube and an ion mobility spectrometer for an ion mobility spectrometer, and belongs to the technical field of substance detection.
  • Ion mobility spectrometry is a material analysis and detection technology developed since the early 1970s. The basic principle it uses is that ions generated under atmospheric pressure conditions, under specific electric field characteristics, drift from the same starting point through the same distance, different ions will take different time due to different mobility, measure this The substance can be qualitatively monitored at one time. Ion mobility spectrometry has the advantages of high detection sensitivity, fast detection speed, fast on-line detection, low detection cost, etc., and has received more and more attention in recent years. Ion mobility spectroscopy is currently used in many fields, such as explosives monitoring, drug inspection, and detection of biochemical warfare agents. In recent years, it has been increasingly used in the field of organic pollutant detection.
  • ion mobility spectrometers typically comprise a migration tube in which ions cause migration under the influence of a constantly applied electric field.
  • the ion transfer tube is the core component of the ion mobility spectrometer, and the movement of the charged ions in the migration tube is mainly affected by the electric field of the migration tube. Increasing the uniformity of the migrating tube electric field helps to increase the sensitivity of the ion mobility spectrometer.
  • a variety of structures for migration tubes have been proposed. As shown in Figure 1, the migration tube can comprise a series of electrode rings 1 axially spaced along the length of the spectrometer, wherein a constant potential difference is maintained between adjacent ring electrodes to create an axially constant electric field.
  • the electric field of the migration zone of the migration tube is formed by applying an increasing or decreasing potential by a uniformly distributed electrode ring.
  • the conventional transfer tube generally adopts a structure in which a thin metal electrode ring 1 is spaced apart from the insulating ring 2.
  • Fig. 4 it was found that the smaller the thickness of the electrode ring 1, the better the electric field strength uniformity of the migration tube.
  • the technical problem to be solved by the invention is to improve the uniformity of the electric field inside the ion transfer tube, to enlarge the ion migration region inside the migration tube, and to solve the problem that the processing and assembly of the thin electrode ring in the prior art is difficult.
  • the present invention provides an electrode ring, an ion transfer tube, and an ion mobility spectrometer for an ion mobility spectrometer.
  • the invention provides an electrode ring for an ion mobility spectrometer having an outer edge thickness greater than an inner edge thickness in an axial direction.
  • the electrode ring has a triangular cross section.
  • the electrode ring has a wedge-shaped cross section.
  • the two sides connected to the edge where the outer edge of the electrode ring is located are two connected arcs.
  • the angle between the edge of the outer edge of the electrode ring section and the adjacent two sides is 90 degrees, and the other two ends of the adjacent two sides are convex toward the inner edge.
  • the edge of the inner edge of the electrode ring section is a straight line.
  • the protrusions are semicircular, triangular, or trapezoidal.
  • the invention also provides an ion transfer tube comprising a plurality of the above described electrode rings.
  • the electrode ring gradually decreases in thickness in the inner edge of the electrode ring in the ion passing direction.
  • the present invention also provides an ion mobility spectrometer comprising the ion transport tube described above.
  • the electrode ring, ion migration tube and ion mobility spectrometer for ion mobility spectrometer change the thickness of the inner edge of the electrode ring structure from the axial direction to the thickness of the outer edge to be smaller than the inner edge thickness in the axial direction.
  • the outer edge thickness significantly improves the electric field uniformity inside the migration tube.
  • the invention expands the ion-stationary migration region inside the migration tube by the electrode ring structure with the outer edge thickness of the inner edge thickness in the axial direction.
  • the electric field uniformity of the ion transfer tube composed of the inner edge thickness equal to the outer edge thickness electrode ring in the axial direction is significantly inferior to that of the same thickness outer edge, and the inner edge of the same thickness is smaller than the outer edge thickness electrode ring. .
  • FIG. 1 is a schematic view of a migration tube after assembly of an electrode ring in the prior art
  • FIG. 2 is a schematic view of an electrode ring in the prior art
  • Figure 3 is a schematic cross-sectional view of an electrode ring in the prior art
  • FIG. 4 is a schematic diagram showing a curve of electric field strength radial component fluctuation of an electrode ring having different thicknesses of inner and outer edges of different thicknesses in the prior art
  • Figure 5 is a schematic view of an electrode ring of the present invention.
  • Figure 6 is a schematic cross-sectional view of an electrode ring of the present invention.
  • Figure 7 is a schematic cross-sectional view of an electrode ring of a different embodiment of the present invention.
  • FIG. 8 is a schematic diagram showing a radial component fluctuation curve of an electric field strength of an electrode ring after chamfering of the inner edge of the present invention
  • Fig. 9 is a schematic view showing the ion transfer tube of the electrode ring assembly after the inner edge chamfering of the present invention.
  • Fig. 10 is a schematic view showing a comparison of the radial component fluctuations of the electric field strength of the electrode ring after the inner and outer edges of the present invention are chamfered with the inner and outer edges of the present invention.
  • the electrode ring 1 is required. Very thin, electrode The thinner the ring 1, the more difficult it is to process and assemble. In order to reduce the difficulty of processing and assembling, it is necessary to appropriately increase the thickness of the electrode ring 1.
  • the invention not only reduces the difficulty of the processing equipment, but also ensures the uniformity of the electric field strength of the ion transfer tube.
  • the present invention provides an electrode ring for an ion mobility spectrometer, as shown in FIG. 5 to FIG.
  • the thickness of the outer edge of the electrode ring in the axial direction (x direction) is greater than the thickness of the inner edge.
  • the electrode ring 1 provided by the present invention has a triangular cross section (the first row in Fig. 7, the first figure and the second figure).
  • the cross section of the electrode ring 1 may be wedge-shaped.
  • the two sides which are preferably connected to the side where the outer edge of the electrode ring 1 is located are the two arcs of the connection (the first row in FIG. 7, the fourth figure) , the fifth picture).
  • the two arcs of the connection the first row in FIG. 7, the fourth figure
  • the angle between the side of the outer edge of the cross section of the electrode ring 1 and the adjacent two sides is 90 degrees, and the other two ends of the adjacent two sides are convex toward the inner edge (in FIG. 7 Second row, third row).
  • the side of the inner edge of the cross section of the electrode ring 1 may be a straight line (the second row in the second row in FIG. 7, the third row in the third row, and the fourth row).
  • the protrusions may be semi-circular (the first row and the fifth figure in the third row in FIG. 7), the triangle (the first row and the fifth figure in the second row in FIG. 7), and the trapezoid (the second row in the second row in FIG. 7) Figure). It should be understood that the present invention is not limited thereto, and other than the embodiment illustrated in Fig. 7, the present invention can be realized as long as the electrode ring 1 has an outer edge thickness greater than the inner edge thickness in the axial direction (x direction).
  • the embodiment of the electrode ring 1 provided by the present invention is not limited to the preferred embodiment listed in the embodiment of the present invention, and the inner ring of the electrode ring 1 is chamfered in any direction so that the electrode ring 1 is on the axis.
  • the invention can be realized in the direction in which the outer edge thickness is greater than the inner edge thickness.
  • the inner edge of the cross section of the electrode ring 1 is preferably at a sharp angle (such as the first row of the first row, the second row, the third figure, the fourth picture, the second row, the fourth picture, the third The second picture).
  • the fillet scheme is slightly worse than the sharp corner scheme in improving the uniformity of the electric field (such as the fifth row in the first row, the first row, the third figure, and the fifth figure in the third row).
  • the chamfering angle of 70 degrees and 45 degrees is compared with the electrode ring which is not chamfered, and it is apparent that the inner diameter is inverted.
  • the radial component fluctuation of the electric field strength at the same position is significantly reduced, indicating that the electric field uniformity is better.
  • the larger the chamfer the better the electric field strength uniformity effect.
  • the present invention also provides an ion transfer tube using the above electrode ring, which comprises a plurality of the above electrode rings.
  • the electrode ring gradually decreases in thickness in the inner edge of the electrode ring in the ion passage direction.
  • the thickness of the inner edge is equal to the thickness of the outer edge
  • different ion transfer tubes composed of electrode rings of different thickness are measured at the inner edge of the ion transfer tube near the electrode ring (for example, the radius of the electrode ring is 10 cm, which needs to be
  • the electric field strength distribution inside the ion transfer tube was obtained by measuring 8 cm from the center point of the electrode ring. As shown in Fig. 4, the thinner the electrode ring is, the more uniform the electric field at the same position in the ion transfer tube (8 cm from the center point of the electrode ring). It can be seen from the figure that the electric field uniformity of the ion transfer tubes composed of electrode rings of different thicknesses is arranged to be 0.5 mm>1 mm>2 mm.
  • the electric field uniformity of the ion chamfering tubes with different chamfers is arranged at 70°>45°>no chamfering. It can be seen from the figure that compared with the electrode ring which is chamfered at 70 degrees and 45 degrees and not chamfered, it is obvious that the migrating tube assembled by the electrode ring after the inner diameter chamfering significantly reduces the radial component fluctuation of the electric field strength at the same position, indicating that the electric field is uniform. Sex becomes better. The larger the chamfer, the better the electric field strength uniformity effect.
  • different ion transfer tubes composed of different electrode rings are measured at the inner edge of the ion transfer tube near the electrode ring (for example, the electrode ring radius is 10 cm, which needs to be 8 cm from the center point of the electrode ring).
  • the electric field strength distribution inside the ion transfer tube is obtained.
  • the difference in the radial component of the electric field strength of the transfer tube composed of the electrode rings having the inner and outer edges of 0.5 mm is about 1 ⁇ 104; the outer edge is 2 mm thick.
  • the inner portion of the 70° electrode ring has a radial component electric field strength radial component difference of about 3 ⁇ 103.
  • the electric field uniformity of the ion transfer tube composed of the electrode ring having the outer edge thickness of 2 mm and the inner edge chamfering 70° is better than that of the electrode ring having an inner and outer edge thickness of 0.5 mm; the outer edge has a thickness of 2 mm and the inner edge.
  • the migration tube composed of an electrode ring composed of an electrode ring having a chamfering angle of 70° and having an inner electrode smooth transition region having an inner and outer edge thickness of 0.5 mm is also enlarged.
  • the present invention also provides an ion mobility spectrometer using the above ion transport tube, the ion mobility spectrometer comprising the ion transfer tube as described above.
  • the electrode ring, the ion transfer tube, and the ion mobility spectrometer for the ion mobility spectrometer provided by the method of the present invention change the thickness of the electrode ring structure from the axial thickness to the outer edge thickness to the axial direction.
  • the thickness of the inner edge in the direction is smaller than the thickness of the outer edge, which significantly improves the electric field uniformity inside the migration tube.
  • the invention expands the ion-stationary migration region inside the migration tube by the electrode ring structure with the outer edge thickness of the inner edge thickness in the axial direction.
  • the electric field uniformity of the ion transfer tube composed of the inner edge thickness equal to the outer edge thickness electrode ring in the axial direction is significantly inferior to that of the same thickness outer edge, and the inner edge of the same thickness is smaller than the outer edge thickness electrode ring. .

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Abstract

一种用于离子迁移谱仪的电极环（1）、离子迁移管、离子迁移谱仪，其中，电极环（1）轴向方向上外缘厚度大于内缘厚度。通过将电极环（1）结构由轴向方向上内缘厚度等于外缘厚度改变为轴向方向上内缘厚度小于外缘厚度，显著提高了迁移管内部电场均匀性。通过轴向方向上外缘厚度大于内缘厚度的电极环（1）结构，扩大了迁移管内部离子平稳迁移区域。由轴向方向上内缘厚度等于外缘厚度电极环（1）组成的离子迁移管的电场均匀性明显差于同样厚度外缘的由轴向方向上内缘厚度小于外缘厚度电极环（1）组成的离子迁移管。

Description

用于离子迁移谱仪的电极环、离子迁移管、离子迁移谱仪
本申请基于申请号为201410853488.2、申请日为2014/12/31的中国专利申请提出，并要求该中国专利申请的优先权，该中国专利申请的全部内容在此引入本申请作为参考。
技术领域
本发明涉及一种用于离子迁移谱仪的电极环、离子迁移管、离子迁移谱仪，属于物质检测技术领域。
背景技术
离子迁移谱技术是自1970年代初发展起来的一门物质分析检测技术。它采用的基本原理是在大气压条件下生成的离子，在特定的电场特征下，自相同的起点开始漂移经过相同的距离时，不同的离子会因具有不同的迁移率需要不同的时间，测量这一时间即可对物质进行定性监测。离子迁移谱技术具有检测灵敏度高，检测速度快，可以实现在线快速检测，检测成本低等优点，近年来越来越受到人们的重视。离子迁移谱目前应用领域很多，例如爆炸物的监测，毒品稽查，生化战剂的检测等领域，近年来还越来越多的应用于有机污染物检测等领域。
众所周知，离子迁移谱仪通常包含迁移管，其中离子在恒定施加的电场影响下引起迁移。离子迁移管是离子迁移谱仪的核心部件，带电离子在迁移管中的运动主要受到迁移管电场的影响。提高迁移管电场的均匀性有助于提高离子迁移谱仪的灵敏度。已经提出迁移管的多种结构。如图1所示，迁移管可包含一系列沿光谱仪的长度轴向间隔分布的电极环1，其中相邻的环形电极之间保持恒定的电位差以便产生轴向的恒定电场。迁移管迁移区的电场由均匀分布的电极环通过施加递增或递减电势形成。如图1至图3所示，现有迁移管一般采用薄的金属电极环1与绝缘环2间隔装配的结构。如图4所示研究发现电极环1的厚度越小，迁移管电场强度均匀性越好。但由于电极环1越薄，加工装配难度越大，费用越高，严重影响了离子迁移谱仪的发展。
发明内容
本发明要解决的技术问题是：提高离子迁移管内部电场均匀性，扩大迁移管内部离子平稳迁移区域和解决现有技术中薄电极环加工装配难度大的问题。
为实现上述的发明目的，本发明提供了一种用于离子迁移谱仪的电极环、离子迁移管、离子迁移谱仪。
一方面，本发明提供一种用于离子迁移谱仪的电极环，所述电极环轴向方向上外缘厚度大于内缘厚度。
其中较优地，所述电极环截面呈三角形。
其中较优地，所述电极环截面呈楔形。
其中较优地，与所述电极环外缘所在的边相连的两条边是两条连接的劣弧。
其中较优地，所述电极环截面外缘所在边与相邻两个边之间的夹角是90度，与相邻两个边的另外两个端点向内缘方向凸起。
其中较优地，所述电极环截面的内缘所在边是直线。
其中较优地，所述凸起是半圆形、三角形、梯形。
另一方面，本发明还提供一种离子迁移管，包括多个上述的电极环。
其中较优地，所述电极环在离子通过方向上电极环的内缘厚度逐渐减小。
再一方面，本发明还提供一种离子迁移谱仪，包括上述的离子迁移管。
本发明提供的用于离子迁移谱仪的电极环、离子迁移管、离子迁移谱仪，通过将电极环结构由轴向方向上内缘厚度等于外缘厚度改变为轴向方向上内缘厚度小于外缘厚度，显著提高了迁移管内部电场均匀性。本发明通过轴向方向上外缘厚度大约内缘厚度的电极环结构，扩大了迁移管内部离子平稳迁移区域。由轴向方向上内缘厚度等于外缘厚度电极环组成的离子迁移管的电场均匀性明显差于同样厚度外缘的由轴向方向上内缘厚度小于外缘厚度电极环组成的离子迁移管。
附图说明
图1是现有技术中电极环装配后的迁移管示意图；
图2是现有技术中电极环示意图；
图3是现有技术中电极环截面示意图；
图4是现有技术中不同厚度的内外缘厚度相等的电极环电场强度径向分量波动曲线示意图；
图5是本发明电极环示意图；
图6是本发明电极环截面示意图；
图7是本发明不同实施方式的电极环截面示意图；
图8是本发明内缘倒角后的电极环电场强度径向分量波动曲线示意图；
图9是本发明内缘倒角后的电极环装配的离子迁移管示意图。
图10是现有技术中内外缘厚度相等的电极环与本发明内缘倒角后的电极环电场强度径向分量波动对比曲线示意图。
具体实施方式
下面结合附图和实施例，对本发明的具体实施方式作进一步详细描述。以下实施例用于说明本发明，但不用来限制本发明的范围。
如图2、图3所示，由于现有技术中电极环1在轴向方向(x方向)上上外缘厚度等于内缘厚度，为了保证离子迁移管电场强度均匀性，需要将电极环1加工的非常薄，电极 环1越薄，加工装配难度越大。为了降低加工装配难度，需要适当增加电极环1的厚度。本发明既要在降低加工装备难度的同时，还要保证离子迁移管电场强度均匀性，为此本发明提供一种用于离子迁移谱仪的电极环，如图5-图7所示，该电极环轴向方向(x方向)上外缘厚度大于内缘厚度。下面对本发明提供的用于离子迁移谱仪的电极环展开详细说明。
如图7所示，作为本发明的优选方案，本发明提供的电极环1的截面呈三角形(图7中第一排，第一图、第二图)。如图5、图6所示，电极环1的截面也可以是楔形。如图7所示，在电极环1的截面是楔形的方案中优选与电极环1外缘所在的边相连的两条边是两条连接的劣弧(图7中第一排，第四图、第五图)。如图7所示，电极环1截面外缘所在边与相邻两个边之间的夹角是90度，与相邻两个边的另外两个端点向内缘方向凸起(图7中第二排、第三排)。电极环1截面的内缘所在边可以是直线(图7中第二排第二图、第三排第三图、第四图)。凸起可以是半圆形(图7中第三排第一图、第五图)、三角形(图7中第二排第一图、第五图)、梯形(图7中第二排第二图)。应当可以理解，本发明不仅限于此，除了图7中列举的方案，其它只要是电极环1在轴向方向(x方向)上外缘厚度大于内缘厚度均可以实现本发明。
如图5-图7所示，本发明提供的电极环1的实施方案，不限于本发明实施方式所列举的优选方案，在电极环1内缘做任意方向倒角，使电极环1在轴向方向上外缘厚度大于内缘厚度均可以实现本发明。如图7所示，电极环1截面的内缘呈尖角的方案最佳(如第一排第一图，第二图、第三图、第四图，第二排第四图，第三排第二图)。圆角方案在改善电场均匀性方面较尖角方案稍差(如第一排第五图，第三排第一图、第三图、第五图)。如图8所示，本发明在电极环在轴向方向(x方向)上外缘厚度均为2mm时，采用倒角70度和45度与不倒角的电极环比较，很明显由内径倒角后的电极环装配的迁移管，相同位置电场强度径向分量波动明显减小，说明电场均匀性变好。倒角越大，电场强度均匀性效果越好。
如图9所示，为了进一步体现本发明提供的电极环的优越性，本发明还提供一种应用上述电极环的离子迁移管，该包括多个上述的电极环。为了进一步确保离子迁移管的电场的均匀性，优选方案是电极环在离子通过方向上电极环的内缘厚度逐渐减小。
在轴向方向上内缘厚度等于外缘厚度的条件下，不同厚度的电极环组成的不同离子迁移管，在离子迁移管靠近电极环内缘处测量(例如，电极环半径为10cm，需要在离电极环中心点8cm处测量)得到离子迁移管内部电场场强分布。如图4所示，电极环厚度越薄，离子迁移管内同一位置(离电极环中心点8cm处)的电场的越均匀。由图可知不同厚度电极环组成的离子迁移管电场均匀性排列为0.5mm＞1mm＞2mm。
在轴向方向上同等外缘厚度条件下，由不同内缘厚度的电极环组成的不同离子迁移管，在离子迁移管靠近电极环内缘处测量(例如，电极环半径为10cm，需要在离电极环中心点8cm处测量)得到离子迁移管内部电场场强分布，如图8所示，，本发明在电极环 在轴向方向(x方向)上外缘厚度均为2mm时，电极内缘倒角越大，离子迁移管内同一位置(离电极环中心点8cm处)的电场的越均匀。不同倒角的离子迁移管电场均匀性排列为70°>45°>不倒角。由图可知采用倒角70度和45度与不倒角的电极环比较，很明显由内径倒角后的电极环装配的迁移管，相同位置电场强度径向分量波动明显减小，说明电场均匀性变好。倒角越大，电场强度均匀性效果越好。
在轴向方向不同外缘厚度条件下，由不同电极环组成的不同离子迁移管，在离子迁移管靠近电极环内缘处测量(例如，电极环半径为10cm，需要在离电极环中心点8cm处测量)得到离子迁移管内部电场场强分布，如图10所示，内外缘厚度均为0.5mm的电极环组成的迁移管电场强度径向分量差值为1×104左右；外缘厚度2mm，内缘倒角70°电极环组成的迁移管电场强度径向分量差值为3×103左右。由图可知外缘厚度2mm、内缘倒角70°的电极环组成的离子迁移管的电场均匀性优于内外缘厚度均为0.5mm的电极环组成的迁移管；外缘厚度2mm、内缘倒角70°的电极环组成的迁移管内部离子平稳迁移区域较内外缘厚度均为0.5mm的电极环组成的迁移管也有所扩大。
为了进一步体现本发明提供的离子迁移管的优越性，本发明还提供一种应用上述离子迁移管的离子迁移谱仪，该离子迁移谱仪包括如上述的离子迁移管。
综上所述，本法发明提供的用于离子迁移谱仪的电极环、离子迁移管、离子迁移谱仪，通过将电极环结构由轴向方向上内缘厚度等于外缘厚度改变为轴向方向上内缘厚度小于外缘厚度，显著提高了迁移管内部电场均匀性。本发明通过轴向方向上外缘厚度大约内缘厚度的电极环结构，扩大了迁移管内部离子平稳迁移区域。由轴向方向上内缘厚度等于外缘厚度电极环组成的离子迁移管的电场均匀性明显差于同样厚度外缘的由轴向方向上内缘厚度小于外缘厚度电极环组成的离子迁移管。
以上实施方式仅用于说明本发明，而并非对本发明的限制，有关技术领域的普通技术人员，在不脱离本发明的精神和范围的情况下，还可以做出各种变化和变型，因此所有等同的技术方案也属于本发明的范畴，本发明的专利保护范围应由权利要求限定。

Claims (10)

  1. 一种用于离子迁移谱仪的电极环，其特征在于，所述电极环轴向方向上外缘厚度大于内缘厚度。
  2. 如权利要求1所述的电极环，其特征在于，所述电极环截面呈三角形。
  3. 如权利要求1所述的电极环，其特征在于，所述电极环截面呈楔形。
  4. 如权利要求3所述的电极环，其特征在于，与所述电极环外缘所在的边相连的两条边是两条连接的劣弧。
  5. 如权利要求1所述的电极环，其特征在于，所述电极环截面外缘所在边与相邻两个边之间的夹角是90度，与相邻两个边另外两个端点向内缘方向凸起。
  6. 如权利要求5所述的电极环，其特征在于，所述电极环截面的内缘所在边是直线。
  7. 如权利要求5所述的电极环，其特征在于，所述凸起是半圆形、三角形、梯形。
  8. 一种离子迁移管，其特征在于，包括多个权利要求1-7任意一项所述的电极环。
  9. 如权利要求8所述的离子迁移管，其特征在于，所述电极环在离子通过方向上电极环的内缘厚度逐渐减小。
  10. 一种离子迁移谱仪，其特征在于，包括如权利要求8、9所述的离子迁移管。
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