CN112687517B - Ion mobility spectrometry structure based on reflection and detection - Google Patents
Ion mobility spectrometry structure based on reflection and detection Download PDFInfo
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Abstract
The invention relates to an ion mobility spectrometry structure based on reflection and detection, which comprises a mobility member and a detection area, wherein the mobility member comprises an input electrode plate positioned at an ionization source and an output electrode plate positioned at the detection area, a plurality of reflection electrode plate groups are arranged between the input electrode plate and the output electrode plate, the input electrode plate, the reflection electrode plate groups and the output electrode plate are arranged in a wave shape, the mobility area is arranged between the input electrode plate, the reflection electrode plate groups and the output electrode plate, ions ionized by the ionization source area enter the input electrode plate, and the ions are reflected to the output electrode plate until the ions are input into the detection area for detection under the action of the reflection electrode plate groups.
Description
Technical Field
The invention relates to the technical field of ion mobility spectrometry, in particular to an ion mobility spectrometry structure based on reflection and detection.
Background
Ion mobility spectrometry, also known as atmospheric pressure mass spectrometry, is a technique that achieves detection of different molecules by movement of ionized charged ions in an electric field. As a chemical analysis technology which does not need a vacuum system, has a simple structure and extremely low detection limit, the method is widely applied to the fields of security inspection, drug prevention, chemical defense and the like.
In the most commonly used time-of-flight ion mobility spectrometry, molecules to be detected fly and migrate in a linear electric field after ionization of an ionization source, and after the time of flight is measured by a detector such as a Faraday disk, the molecules are converted into ion mobility to achieve the purpose of detection. The resolution of ion mobility spectrometry is an important measure of its detection capability. The ion mobility spectrometry resolution is low, and ions with different mobilities cannot be effectively distinguished and detection can be realized.
In this case, the resolving power of the ion mobility spectrum for ions with different mobilities depends on the length of the total flight time of the ions, and the longer the flight time is, the higher the resolution is, the stronger the detection capability of the device is, and in the time-of-flight mobility spectrum, the resolution improvement is realized by increasing the length of a mobility tube and further increasing the flight time. However, lengthening the length of the transfer tube requires an increase in the volume of the instrument, which in turn negatively impacts the design and portability of the instrument.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the defects that the extension of the length of a migration tube increases the volume of an instrument, thereby negatively affecting the design and portability of the instrument in the prior art, and thus provide an ion migration spectrum structure based on reflection and detection.
An ion mobility spectrometry structure based on reflection and detection comprises a mobility member and a detection region;
the migration piece comprises an input electrode plate positioned at the ionization source region and an output electrode plate positioned at the detection region, wherein a plurality of reflection electrode plate groups are arranged between the input electrode plate and the output electrode plate, the input electrode plate, the reflection electrode plate groups and the output electrode plate are arranged in a wave shape, and a migration region is arranged among the input electrode plate, the reflection electrode plate groups and the output electrode plate;
the ions ionized from the ionization source region enter the input electrode plate and are reflected to the output electrode plate until being input into the detection region for detection under the action of the reflecting electrode plate group
Further, the reflecting electrode plate group comprises a first electrode plate and a second electrode plate for reflecting ions, and a reverse electric field is formed between the first electrode plate and the second electrode plate to change the direction of the ions.
Further, the input electrode plate and the output electrode plate are respectively located at the left side and the right side of the migration zone, the first electrode plate and the input electrode plate located at the left side of the migration zone are distributed along the vertical direction, and the first electrode plate and the output electrode plate located at the right side of the migration zone are also distributed along the vertical direction.
Further, the preset distances between the input electrode plate and the first electrode plate on the same side and between the output electrode plate and the first electrode plate on the same side are the same.
Further, the top end of the input electrode plate is inclined towards the direction of the output electrode plate, and the first electrode plate and the output electrode plate are vertically arranged.
Further, the input electrode plate, the first electrode plate and the output electrode plate are all arranged as screen-shaped electrodes which can set voltage and allow ions to pass through.
Further, the detection area is provided with a detector, and the detector is used for detecting ions output by the output electrode plate.
Further, the detector is configured as a faraday disc.
Further, the input electrode plate, the output electrode plate and the reflecting electrode plate are made of alloy copper.
The technical scheme of the invention has the following advantages:
1. the invention provides an ion mobility spectrometry structure based on reflection and detection, which comprises a mobility component and a detection region; the migration piece comprises an input electrode plate positioned at the ionization source region and an output electrode plate positioned at the detection region, wherein a plurality of reflection electrode plate groups are arranged between the input electrode plate and the output electrode plate, the input electrode plate, the reflection electrode plate groups and the output electrode plate are arranged in a wave shape, and a migration region is arranged among the input electrode plate, the reflection electrode plate groups and the output electrode plate; ions ionized by the ionization source region enter the input electrode plate and are reflected to the output electrode plate until being input into the detection region for detection under the action of the reflecting electrode plate group. When the ion carrier is used, the ionization source ionizes molecules to be detected, ionized ions are introduced into the migration area through the input electrode plate, an electric field is applied to the reflecting electrode plate group at the moment, so that the ions output by the input electrode plate can be reflected in the migration area, the ions can make zigzag movement back and forth for a plurality of times in the electric field direction during ion carrier migration, the path and time of ion migration are prolonged, the resolution is improved under the condition that the length of the equipment is not obviously increased, the detection of the equipment can be stronger, the longer migration path and migration time can be realized in a small volume, and the higher resolution is realized.
2. The invention provides an ion mobility spectrometry structure based on reflection and detection, wherein the reflection electrode plate group comprises a first electrode plate and a second electrode plate which reflect ions, and a reverse electric field is formed between the first electrode plate and the second electrode plate to change the direction of the ions. When the ions output by the input electrode plate into the migration zone are reflected, an electric field is applied to the second electrode plate, so that a reverse electric field is formed between the first electrode plate and the second electrode plate, the effect of reflecting the ions is achieved, and the ions can do zigzag movement among the plurality of first electrode plates.
3. According to the ion mobility spectrometry structure based on reflection and detection, the input electrode plate and the output electrode plate are respectively positioned at the left side and the right side of the migration zone, the first electrode plate and the input electrode plate positioned at the left side of the migration zone are distributed along the vertical direction, and the first electrode plate and the output electrode plate positioned at the right side of the migration zone are also distributed along the vertical direction. The input electrode plate and the first electrode plate which are positioned on the left side and the input electrode plate and the first electrode plate which are positioned on the right side are all arranged along the vertical direction, so that the arrangement of the electrode plates is more standard, the ion migration path is longer, the resolution ratio is better, and the detection effect is better under the condition that the external volumes of the equipment are the same.
4. According to the ion mobility spectrometry structure based on reflection and detection, the top end of the input electrode plate is inclined towards the direction of the output electrode plate, and the first electrode plate and the output electrode plate are vertically arranged. When the ionization source inputs ions to the input electrode plate, the ions in the input electrode plate are introduced into the migration zone along the direction perpendicular to the input electrode plate, and at the moment, the included angle between the direction of the ions in the migration zone and the first electrode plate is an acute angle, so that the ions on the first electrode plate can be reflected to the next first electrode plate and sequentially reflected until being introduced into the output electrode plate and the detection zone.
5. The ion mobility spectrometry structure based on reflection and detection provided by the invention is characterized in that the input electrode plate, the first electrode plate and the output electrode plate are all arranged as screen-shaped electrodes which can set voltage and allow ions to pass through. Under the effect of the wire mesh electrode, ions with different mobilities can be detected on different electrodes, and for ions with high mobility and high speed, the reverse electric field is insufficient for returning the ions, so that the separation and detection of the ions can be realized on the first electrode plate of the previous stage, the practicability is wider, and the use is more convenient.
6. The ion mobility spectrometry structure based on reflection and detection provided by the invention is characterized in that the detection area is provided with a detector, the detector is used for detecting ions output by the output electrode plate, and the detector is arranged as a Faraday disc. After ions migrate in the migration area, different ions can reach the detector successively, the types of the ions are deduced according to different ion arrival times under the action of the Faraday disc, and the number of the ions is deduced through the size of pulse signals of the detector, so that detection is completed.
7. The ion mobility spectrometry structure based on reflection and detection provided by the invention is characterized in that the input electrode plate, the output electrode plate and the reflecting electrode plate are made of alloy copper. Through the arrangement of the input electrode plate, the output electrode plate and the reflecting electrode plate group which are made of alloy copper materials, the conductivity of the electrode plate can be effectively improved, and the conductive effect of the electrode plate is better.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of the overall structure of an ion mobility spectrometry structure based on reflection and detection according to the present invention.
Reference numerals illustrate:
1. an ionization source; 2. a transfer member; 21. an input electrode plate; 22. an output electrode plate; 23. a reflecting electrode plate group; 231. a first electrode plate; 232. a second electrode plate; 3. a detection zone; 4. and a migration zone.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In addition, the technical features of the different embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
Examples
Referring to fig. 1, the present invention provides an ion mobility spectrometry structure based on reflection and detection, comprising a mobility assembly 2 and a detection area 3; the migration piece 2 comprises an input electrode plate 21 positioned at the ionization source 1 region and an output electrode plate 22 positioned at the detection region 3, a plurality of reflection electrode plate groups 23 are arranged between the input electrode plate 21 and the output electrode plate 22, the input electrode plate 21, the reflection electrode plate groups 23 and the output electrode plate 22 are arranged in a wave shape, and a migration region 4 is arranged among the input electrode plate 21, the reflection electrode plate groups 23 and the output electrode plate 22; ions ionized in the ionization source 1 region enter the input electrode plate 21 and are reflected to the output electrode plate 22 by the reflecting electrode plate group 23 until being input into the detection region 3 for detection. When the ion source 1 is used, the molecules to be detected are ionized, ionized ions are introduced into the migration zone 4 through the input electrode plate 21, and an electric field is applied to the reflecting electrode plate group 23 at the moment, so that the ions output by the input electrode plate 21 can be reflected in the migration zone 4, and the ions can make zigzag movement back and forth for a plurality of times in the direction of the electric field during ion carrier migration, so that the path and time of ion migration are prolonged, the resolution is improved under the condition that the length of the equipment is not obviously increased, the detection of the equipment can be stronger, the longer migration path and migration time can be realized in a small volume, and the higher resolution is realized.
The reflecting electrode plate group 23 includes a first electrode plate 231 and a second electrode plate 232 which reflect ions, and a reverse electric field is formed between the first electrode plate 231 and the second electrode plate 232 to redirect the ions. When the ions output from the input electrode plate 21 into the migration zone 4 are reflected, an electric field is applied to the second electrode plate 232, so that a reverse electric field is formed between the first electrode plate 231 and the second electrode plate 232, thereby achieving the effect of reflecting the ions, and enabling the ions to perform zigzag motion among the plurality of first electrode plates 231.
The input electrode plate 21 and the output electrode plate 22 are respectively located at the left side and the right side of the migration zone 4, the first electrode plate 231 and the input electrode plate 21 located at the left side of the migration zone 4 are arranged in the vertical direction, and the first electrode plate 231 and the output electrode plate 22 located at the right side of the migration zone 4 are also arranged in the vertical direction. The input electrode plate 21 and the first electrode plate 231 which are positioned on the left side and the input electrode plate 21 and the first electrode plate 231 which are positioned on the right side are all arranged along the vertical direction, so that the arrangement of the electrode plates is more standard, the ion migration path is longer, the resolution is better, and the detection effect is better under the condition that the external volumes of the equipment are the same.
The preset distances of the input electrode plate 21 and the first electrode plate 231 on the same side and the output electrode plate 22 and the first electrode plate 231 on the same side are the same.
The top end of the input electrode plate 21 is inclined toward the output electrode plate 22, and the first electrode plate 231 and the output electrode plate 22 are vertically disposed. When the ionization source 1 inputs all ions onto the input electrode plate 21, the ions in the input electrode plate 21 are introduced into the migration zone 4 along the direction perpendicular to the input electrode plate 21, and at this time, the included angle between the direction of the ions in the migration zone 4 and the first electrode plate 231 is an acute angle, so that the ions on the first electrode plate 231 can be reflected onto the next first electrode plate 231 and sequentially reflected until being introduced into the output electrode plate 22 and the detection zone 3.
The ionization source 1 and the input electrode plate 21 are arranged in parallel, so that ions at the ionization position of the ionization source 1 can be vertically input into the input electrode plate 21, and the ions can enter the input electrode plate 21 completely.
The input electrode plate 21, the first electrode plate 231, and the output electrode plate 22 are each provided as a screen-like electrode capable of setting a voltage while allowing ions to pass through. Under the effect of the wire mesh electrode, ions with different mobilities can be detected on different electrodes, and for ions with high mobility and high speed, the reverse electric field is insufficient for returning the ions, so that the separation and detection of the ions can be realized on the first electrode plate 231 at the front stage, the practicability is wider, and the use is more convenient.
The detection area 3 is provided with a detector for detecting ions output from the output electrode plate 22, and the detector is provided as a faraday plate. After ions migrate in the migration zone 4, different ions can reach the detector successively, the ion types are deduced according to different ion arrival times under the action of the Faraday disc, and the number of the ions is deduced through the size of pulse signals of the detector, so that detection is completed.
The material of the input electrode plate 21, the output electrode plate 22 and the reflecting electrode plate group 23 is alloy copper. By arranging the input electrode plate 21, the output electrode plate 22 and the reflecting electrode plate group 23 which are made of alloy copper, the conductivity of the electrode plate can be effectively improved, and the conductive effect of the electrode plate is better.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the invention.
Claims (8)
1. An ion mobility spectrometry structure based on reflection and detection, characterized by comprising a mobility member (2) and a detection zone (3);
the migration piece (2) comprises an input electrode plate (21) positioned at the ionization source (1) and an output electrode plate (22) positioned at the detection area (3), a plurality of reflection electrode plate groups (23) are arranged between the input electrode plate (21) and the output electrode plate (22), the input electrode plate (21), the reflection electrode plate groups (23) and the output electrode plate (22) are arranged in a wave shape, and a migration area (4) is arranged among the input electrode plate (21), the reflection electrode plate groups (23) and the output electrode plate (22);
ions ionized from the ionization source (1) area enter the input electrode plate (21) and are reflected to the output electrode plate (22) until being input into the detection area (3) for detection under the action of the reflecting electrode plate group (23);
the reflecting electrode plate group (23) comprises a first electrode plate (231) and a second electrode plate (232) for reflecting ions, and a reverse electric field is formed between the first electrode plate (231) and the second electrode plate (232) to change the direction of the ions.
2. The ion mobility spectrometry structure based on reflection and detection according to claim 1, wherein the input electrode plate (21) and the output electrode plate (22) are respectively located at the left and right sides of the migration zone (4), the first electrode plate (231) and the input electrode plate (21) located at the left side of the migration zone (4) are arranged in the vertical direction, and the first electrode plate (231) and the output electrode plate (22) located at the right side of the migration zone (4) are also arranged in the vertical direction.
3. The ion mobility spectrometry structure according to claim 2, characterized in that the preset distances of the input electrode plate (21) and the first electrode plate (231) on the same side and the output electrode plate (22) and the first electrode plate (231) on the same side are the same.
4. The ion mobility spectrometry structure based on reflection and detection according to claim 2, wherein the top end of the input electrode plate (21) is inclined toward the output electrode plate (22), and the first electrode plate (231) and the output electrode plate (22) are vertically arranged.
5. The ion mobility spectrometry structure based on reflection and detection according to claim 1, characterized in that the input electrode plate (21), the first electrode plate (231) and the output electrode plate (22) are each provided as a wire-mesh-like electrode capable of setting a voltage while allowing ions to pass through.
6. The ion mobility spectrometry structure based on reflection and detection according to claim 1, characterized in that the detection zone (3) is provided with a detector for detecting ions output by the output electrode plate (22).
7. The ion mobility spectrometry structure according to claim 6, wherein the detector is configured as a faraday disk.
8. The ion mobility spectrometry structure according to claim 1, wherein the input electrode plate (21), the output electrode plate (22) and the reflecting electrode plate group (23) are made of alloy copper.
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