Ionization source, detection device and detection system

Abstract

The present invention discloses an ionization source, a detection device, and a detection system. The ionization source includes a first electrode member, a second electrode member, and a dielectric member. The first electrode member is adapted to be electrically connected to a first terminal of an external power source. The second electrode member is formed into a body having a through hole. The first and second electrode members are spaced apart and adapted to be electrically connected to a second terminal of the external power source. The dielectric member is disposed between the first and second electrode members and is in contact with the first and second electrode members. The dielectric member and the through hole enclose an ion generation chamber. The ionization source of this structure replaces the container used in conventional ionization sources with the ion generation chamber, reducing its overall size and achieving greater device structural stability. This reduces the difficulty in transporting and the susceptibility to damage of the container of conventional ionization sources and increases the service life of the device.

Description

Technical Field

[0001] The present invention relates to the technical field of analysis and detection, and in particular to an ionization source, a detection device and a detection system. Background Art

[0002] Mass spectrometry and ion mobility spectrometry are detection technologies developed in the early 20th century and the late 1960s, respectively. Mass spectrometry is considered to be a universal method with both high specificity and high sensitivity and has been widely used. Mass spectrometry instruments generally consist of a sample introduction system, an ion source, a mass analyzer, a detector, a data processing system, etc., while ion mobility spectrometry uses the difference in ion migration time to separate and characterize ions, using a concept similar to chromatographic retention time, and was originally called plasma chromatography.

[0003] Ion mobility spectrometers and mass spectrometers often utilize various ionization sources, such as radioactive sources, electron bombardment ionization sources, and APCI ionization sources. These ionization sources ionize molecules, which then enter a migration tube, quadrupole, and ion trap, and finally enter a magnetic mass spectrometer plasma analyzer for analysis and results. Currently, dielectric barrier discharge (DBD) technology is also used in ozone generators, water treatment, disinfection, and mass spectrometry DBD ionization sources. Due to its advantages such as high ionization energy, reagent-free operation, and ease of miniaturization, it has been widely used for rapid on-site testing in fields such as chemistry and pharmaceuticals, demonstrating broad development prospects and enormous application value.

[0004] The prior art dielectric barrier discharge ionization source often consists of an insulating container for ionization, electrodes arranged inside it, and a dielectric. When the device is in operation, a working gas pipeline is inserted into the container to generate target ions. To accommodate the electrodes and pipelines, the ionization source with such a structure is usually large in size. In addition, the container is usually made of glass to ensure visibility. This makes it difficult to transport and can easily cause damage. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is that the insulating container of the ionization source in the prior art has the defect of being difficult to transport due to its large volume and being usually made of glass.

[0006] To this end, the present invention provides an ionization source, comprising:

[0007] a first electrode member adapted to be electrically connected to a first end of an external power source;

[0008] a second electrode member formed into a body having a through hole, the first electrode member and the second electrode member being spaced apart from each other, the second electrode member being adapted to be electrically connected to a second end of an external power source;

[0009] a dielectric member, the dielectric member being disposed between the first electrode member and the second electrode member and being bonded to the first electrode member and the second electrode member, the dielectric member and the through hole enclosing an ion generating chamber, the ion generating chamber being adapted to admit a working medium;

[0010] The ionization source has an ionization state when the first electrode component and the second electrode component are connected to an external power supply; in the ionization state, the dielectric component is broken down and converts the working medium in the ion generating chamber into plasma.

[0011] Optionally, in the above-mentioned ionization source, the second electrode member and / or the dielectric member has a gas filling hole, one end of the gas filling hole is suitable for communicating with a medium source of a working medium, and the other end is communicated with the ion generating chamber.

[0012] Optionally, in the above ionization source, an outer surface of the first electrode component close to the dielectric component has an insulating structure.

[0013] Optionally, in the above-mentioned ionization source, the insulating structure is a combination of one or more of quartz, glass, ceramic, plastic and rubber; and / or

[0014] The dielectric member is one or more of quartz, glass, ceramic, plastic and rubber.

[0015] Optionally, in the above-mentioned ionization source, the insulating structure is a ceramic protective layer, the dielectric component is a ceramic component, and the first electrode component and the dielectric component are connected by ceramic sintering.

[0016] A detection device comprises the ionization source described in any one of the above items.

[0017] Optionally, the detection device further comprises a migration chamber and an ion receiving plate, wherein the ion receiving plate and the second electrode member are spaced apart, and the migration chamber is disposed between the ion receiving plate and the second electrode member; the migration chamber comprises a migration cavity for accommodating ions to be detected, and the migration cavity is in communication with the ion generating cavity;

[0018] Wherein, in the ionization state, after the plasma on the ion generating chamber side is converted into ions to be measured, the plasma moves toward the ion receiving plate through the migration chamber, and the ion receiving plate is suitable for receiving the ions to be measured.

[0019] Optionally, the above-mentioned detection device also includes a reaction chamber, which is arranged between the second electrode component and the migration chamber. The reaction chamber has a reaction cavity suitable for accommodating the molecules of the object to be detected, the plasma and the ions to be detected generated after the reaction between the two; the reaction cavity is connected to the ion generating cavity.

[0020] Optionally, the above-mentioned detection device also includes an ion gate, which is arranged between the reaction chamber and the migration chamber. The ion gate has a sealed state that separates the reaction chamber and the migration chamber, and an open state that connects the reaction chamber and the migration chamber. When the ion gate is in the open state, the ions to be detected move from the reaction chamber through the migration chamber toward the ion receiving plate.

[0021] A detection system comprises an external power supply, a medium source, and the detection device described in any one of the above items, wherein the medium source is connected to an ion generating chamber.

[0022] The technical solution provided by the present invention has the following advantages:

[0023] 1. The ionization source provided by the present invention includes a first electrode member, a second electrode member, and a dielectric member, wherein the first electrode member is suitable for electrically connecting to a first end of an external power supply, the second electrode member is formed into a body having a through hole, the first electrode member and the second electrode member are spaced apart, the second electrode member is suitable for electrically connecting to the second end of the external power supply, and the dielectric member is arranged between the first electrode member and the second electrode member and is arranged in contact with the first electrode member and the second electrode member. The dielectric member and the through hole enclose an ion generating chamber, and the ion generating chamber is suitable for passing a working medium. The ionization source has an ionization state when the first electrode member and the second electrode member are connected to the external power supply. In the ionization state, the dielectric member is broken down and converts the working medium in the ion generating chamber into plasma.

[0024] The ionization source of this structure is configured by providing a through hole in the second electrode member and fitting the dielectric member to the second electrode member, so that the through hole in the second electrode member and the dielectric member enclose an ion generating chamber. In actual use, it is only necessary to introduce a working gas into the ion generating chamber and to pass a high-voltage current through the first and second electrode members to generate the required plasma in the ion generating chamber. The ion generating chamber replaces the insulating container used in a conventional ionization source, and the ion generating chamber is formed by combining the components of the ionization source itself to achieve the effect of a container. The overall size of the ionization source of this structure is reduced, thereby achieving higher structural stability of the device, reducing the problems of the container of a conventional ionization source being difficult to transport and prone to damage, and extending the service life of the device.

[0025] 2. In the ionization source provided by the present invention, the first electrode member and / or the second electrode member and / or the dielectric member have a gas filling hole, one end of which is adapted to communicate with a dielectric source of a working medium and the other end of which communicates with an ion generating chamber. By providing a gas filling hole with one end connected to the dielectric source of the working medium and the other end connected to the ion generating chamber, the ionization source of this structure can release the working medium into the ion generating chamber during use by directly connecting the dielectric source to the gas filling hole. This ensures that the ion generating chamber has sufficient working medium for the device to use, eliminating the need to insert an additional gas filling tube into the ion generating chamber. This ionization source structure is simpler, has fewer components, and is more stable.

[0026] 3. The detection device provided by the present invention also includes an ion gate, which is arranged between the reaction chamber and the migration chamber. The ion gate has a sealed state that separates the reaction chamber and the migration chamber, and an open state that connects the reaction chamber and the migration chamber. When the ion gate is in the open state, the ions to be measured move from the reaction chamber through the migration chamber toward the ion receiving plate. The detection device of this structure has an ion gate arranged between the reaction chamber and the migration chamber. By controlling the opening and closing of the ion gate, it is possible to control whether the ions in the reaction chamber can enter the migration chamber. When the ion gate is closed, the ions in the ion generating chamber enter the reaction chamber and react with the molecules to be measured in the reaction chamber to be converted into ions to be measured. After the reaction is completed, the ions to be measured fill the reaction chamber. When the ion gate is opened, the ions to be measured in the reaction chamber are repelled by the second electrode component, and the ions to be measured pass through the ion gate into the migration chamber and move toward the ion receiving plate, and finally fall onto the ion receiving plate. The operation is simple and the effect is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 A schematic structural diagram of an ionization source provided in an embodiment of the present invention;

[0029] Figure 2 A partial schematic diagram of the ionization source provided in Example 1 of the present invention;

[0030] Figure 3 is a cross-sectional view of a detection device provided in Example 2 of the present invention;

[0031] Figure 4 Schematic diagram of the structure of the detection system provided in Example 3 of the present invention;

[0032] Description of reference numerals:

[0033] 1-first electrode component; 2-second electrode component; 3-dielectric component; 4-ion generating chamber; 5-migration chamber; 6-ion receiving plate; 7-reaction chamber; 8-ion gate; 9-pump; 10-filter element. DETAILED DESCRIPTION

[0034] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0035] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0036] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0037] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0038] Example 1

[0039] This embodiment provides an ionization source, such as Figures 1 to 4As shown, it includes a first electrode member 1, a second electrode member 2 and a dielectric member 3, wherein the first electrode member 1 is suitable for electrically connecting to the first end of an external power supply, the second electrode member 2 is formed into a body with a through hole, the first electrode member 1 and the second electrode member 2 are spaced apart, the second electrode member 2 is suitable for electrically connecting to the second end of the external power supply, the dielectric member 3, the dielectric member 3 is arranged between the first electrode member 1 and the second electrode member 2, and is arranged in contact with the first electrode member 1 and the second electrode member 2, the dielectric member 3 and the through hole enclose an ion generating chamber 4, the ion generating chamber 4 is suitable for passing a working medium, the ionization source has an ionization state when the first electrode member 1 and the second electrode member 2 are connected to the external power supply, and in the ionization state, the dielectric member 3 is broken down and the working medium in the ion generating chamber 4 is converted into plasma.

[0040] The ionization source of this structure is formed by opening a through hole in the second electrode member 2 and fitting the dielectric member 3 to the second electrode member 2, so that the through hole in the second electrode member 2 and the dielectric member 3 enclose an ion generating chamber 4. In actual use, it is only necessary to pass a working gas into the ion generating chamber 4 and pass a high voltage current through the first electrode member 1 and the second electrode member 2 to generate the required plasma in the ion generating chamber 4. The ion generating chamber 4 replaces the insulating container used in traditional ionization sources, and the ion generating chamber 4 is formed by combining the components of the ionization source itself to achieve the effect of the container. The ionization source of this structure has a higher device structural stability due to its small number of components, simple structure and high structural integrity, which reduces the problem of the container of conventional ionization sources being difficult to transport and easy to be damaged, and improves the service life of the device. In this embodiment, the first electrode member 1 and the second electrode member 2 are both electrode plates.

[0041] The ionization source provided in this embodiment is as follows: Figure 1 or Figure 4As shown, the second electrode member 2 has a gas filling hole, one end of which is adapted to communicate with a source of working medium and the other end with the ion generating chamber 4. By providing a gas filling hole with one end connected to the source of working medium and the other end connected to the ion generating chamber 4, the ionization source of this structure can release the working medium into the ion generating chamber 4 during use by directly connecting the source of working medium to the gas filling hole. This ensures that there is sufficient working medium in the ion generating chamber 4 for the device to use, eliminating the need to insert a gas filling tube into the ion generating chamber 4. This ionization source structure is simpler, has fewer components, and offers greater structural stability. Specifically, in this embodiment, the gas filling hole is a hole that extends through the outer wall of the second electrode member 2 and connects it to the through hole. When the working medium is filled into the ion generating chamber 4, the ionization source of this structure generates a higher pressure. The gas filling holes arranged radially along the second electrode member 2 can reduce damage to the integrity of the second electrode member 2, resulting in greater structural stability. Of course, this solution is only a preferred solution and is not the only limitation on the form and location of the filling holes. As long as it can connect the medium source and the ion generating chamber 4, it will be acceptable.

[0042] As another possible implementation of this embodiment, the filling hole can also be opened on the dielectric component 3. Since the ion generating chamber 4 is formed by the dielectric component 3 attached to the second electrode component 2 and the through hole on the second electrode component 2 body, the filling hole opened on the dielectric component 3 can still directly achieve the effect of connecting the dielectric source with the ion generating chamber 4. At the same time, by opening the filling hole on the dielectric component 3, the damage to the structural integrity caused by the opening of the filling hole can be transferred from the second electrode component 2 to the dielectric component 3, thereby eliminating the damage to the structural integrity of the second electrode component 2 caused by the opening of the filling hole, and further improving the stability and service life of the second electrode component 2 body. However, at the same time, since the filling hole is opened on the dielectric, the thickness of the dielectric at the filling hole must be less than the thickness of the other parts, which will have a certain impact on the efficiency of ion generation in the ion generating chamber 4. Therefore, in production and use, the opening position of the filling hole needs to be comprehensively considered. Of course, the filling hole can also be provided on both the dielectric component 3 and the second electrode component 2 at the same time. By providing matching through grooves on one end of the dielectric component 3 facing the second electrode component 2 and on the other end of the second electrode component 2 facing the dielectric component 3, the two through grooves enclose the filling hole. In this case, the location of the filling hole has little effect on the structural integrity of the second electrode component 2 and the dielectric component 3. The principle is consistent with the above two embodiments, so it will not be elaborated on.

[0043] The ionization source provided in this embodiment has an insulating structure on the outer surface of the first electrode member 1 close to the dielectric member 3. The insulating structure is a combination of one or more of quartz, glass, ceramic, plastic and rubber. At the same time, the dielectric member 3 is also a combination of one or more of quartz, glass, ceramic, plastic and rubber. Specifically in this embodiment, the insulating structure is a ceramic protective layer, the dielectric member 3 is a ceramic member, and the first electrode member 1 and the dielectric member 3 are connected by ceramic sintering. The ionization source of this structure connects the first electrode member 1 and the dielectric member 3 by ceramic sintering, so that the ceramic grains between the two are small, dense and have high mechanical properties and high mechanical properties, thereby improving the mechanical properties and mechanical properties of the ionization source of this structure. Specifically, this embodiment does not limit the connection method of the first electrode member 1 and the dielectric member 3, as long as it can achieve the effect of tightly fitting the first electrode member 1 and the dielectric member 3.

[0044] Example 2

[0045] This embodiment provides a detection device, such as Figures 1 to 4 As shown, it includes the ionization source, migration chamber 5 and ion receiving plate 6 provided in Example 1, the ion receiving plate 6 and the second electrode member 2 are spaced apart, the migration chamber 5 is arranged between the ion receiving plate 6 and the second electrode member 2, the migration chamber 5 has a migration chamber for accommodating the ions to be measured, and the migration chamber is connected to the ion generating chamber 4. In the ionized state, after the plasma on the side of the ion generating chamber 4 is converted into the ions to be measured, it moves toward the ion receiving plate 6 through the migration chamber, and the ion receiving plate 6 is suitable for receiving the ions to be measured. The detection device of this structure is used when the ions in the ion generating chamber 4 react with the molecules of the analyte and fall onto the ion receiving plate 6 through the transmission of the migration chamber 5. The movement speeds of different ions in the migration chamber 5 are different, so that the time to generate signals on the ion receiving plate 6 is different. According to the difference in time, different ions can be distinguished and different samples can be identified.

[0046] The detection device provided in this embodiment is as follows: Figure 3 or Figure 4 As shown, it also includes a reaction chamber 7, which is arranged between the second electrode member 2 and the migration chamber 5. The reaction chamber 7 has a reaction cavity suitable for accommodating the molecules of the analyte, plasma and the ions to be measured generated after the reaction between the two. The reaction cavity is connected to the ion generating chamber 4.

[0047] The detection device provided in this embodiment is as follows: Figure 3 or Figure 4As shown, it also includes an ion gate 8, which is arranged between the reaction chamber 7 and the migration chamber 5. The ion gate 8 has a sealed state that separates the reaction chamber and the migration chamber, and an open state that connects the reaction chamber and the migration chamber. When the ion gate 8 is in the open state, the ions to be measured move from the reaction chamber through the migration chamber toward the ion receiving plate 6. The detection device of this structure has an ion gate 8 set between the reaction chamber 7 and the migration chamber 5. By controlling the opening and closing of the ion gate 8, it can be controlled whether the ions in the reaction chamber 7 can enter the migration chamber 5. When the ion gate 8 is closed, the ions in the ion generating chamber 4 enter the reaction chamber 7 and react with the molecules to be measured in the reaction chamber 7 to be converted into ions to be measured. After the reaction is completed, the ions to be measured fill the reaction chamber 7. When the ion gate 8 is opened, the ions to be measured in the reaction chamber 7 are repelled by the second electrode 2, and the ions to be measured pass through the ion gate 8 into the migration chamber 5 and move toward the ion receiving plate 6, and finally fall on the ion receiving plate 6. The operation is simple and the effect is good.

[0048] Example 3

[0049] This embodiment provides a detection system, such as Figure 4 As shown, it includes an external power supply, a dielectric source, and the detection device provided in Example 2, and the dielectric source is connected to the ion generating chamber 4. In this embodiment, the positive electrode of the external power supply is electrically connected to the first electrode member 1, and the negative electrode of the external power supply is electrically connected to the second electrode member 2. When the external power supply is energized, the high voltage current instantly breaks through the dielectric member 3, thereby forming a dielectric barrier discharge, and then the dielectric source fills the working medium into the ion generating chamber 4 through the filling hole. Under the action of the high voltage current, the working medium is converted into a corresponding plasma. The plasma first enters the reaction chamber 7 to react with the molecules of the object to be detected to generate the ions to be detected. Then, the ion gate 8 is opened, and the ions to be detected move toward the ion receiving plate 6 under the repulsion of the second electrode member 2. Different ions have different movement speeds in the migration chamber 5, so that the time to generate signals on the ion receiving plate 6 is different. According to the difference in time, different ions can be distinguished and different samples can be identified. In this embodiment, the external power supply is an AC power supply. When the dielectric component 3 is broken down by the high-voltage current, its own insulating properties prevent the first electrode component 1 and the second electrode component 2 from continuing to be energized. After the power supply between the first electrode component 1 and the second electrode component 2 stops, the external power supply provides a reverse current to the first electrode component 1 and the second electrode component 2. At this time, the dielectric component 3 is broken down by the high-voltage current again. The conversion rate of this process is determined by the frequency of the external power supply. As a preferred solution, an external power supply with a frequency of 17 kHz or above is usually selected as the power supply. The detection system of this structure can continuously generate plasma in the ion generating chamber 4 with high efficiency.

[0050] In this embodiment, a pump 9 and a filter element 10 can also be provided along the flow path of the medium source. The power of the pump 9 drives the medium source to flow through the air filling hole to the ion generating chamber 4. The filter element can purify the working medium in the medium source, reducing contamination, thereby improving the purity of the working medium in the ion generating chamber 4 and, in turn, improving the purity of the generated plasma. Specifically, this embodiment does not limit the type of working medium in the medium source; it should be selected based on the type of analyte molecules, as long as it can react with the analyte molecules and generate ions to be measured. For example, the working medium in the medium source can be a combination of one or more of air, dry air, nitrogen, argon, and helium.

[0051] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. An ionization source, characterized in that include: A first electrode member (1) adapted to be electrically connected to a first end of an external power source; The second electrode member (2) is formed into a body having a through hole, the first electrode member (1) and the second electrode member (2) are spaced apart, and the second electrode member (2) is suitable for being electrically connected to a second end of an external power source; a dielectric member (3), the dielectric member (3) being arranged between the first electrode member (1) and the second electrode member (2), and being arranged in close contact with the first electrode member (1) and the second electrode member (2); the dielectric member (3) and the through hole enclosing an ion generating chamber (4); the ion generating chamber (4) being suitable for introducing a working medium; The ionization source has an ionization state of the first electrode member (1) and the second electrode member (2) when connected to an external power supply; In the ionized state, the dielectric component (3) is broken down and converts the working medium in the ion generating chamber (4) into plasma; Wherein, the first electrode member (1) and / or the second electrode member (2) is an electrode plate.

2. The ionization source according to claim 1, characterized in that The second electrode member (2) and / or the dielectric member (3) has an air filling hole, one end of which is suitable for communicating with a medium source of a working medium, and the other end of which is communicated with the ion generating chamber (4).

3. The ionization source according to claim 1, characterized in that The outer surface of the first electrode component (1) on a side close to the dielectric component (3) has an insulating structure.

4. The ionization source according to claim 3, characterized in that The insulating structure is one or more of quartz, glass, ceramic, plastic and rubber; and / or The dielectric component (3) is a combination of one or more of quartz, glass, ceramic, plastic and rubber.

5. The ionization source according to claim 3 or 4, characterized in that The insulating structure is a ceramic protective layer, the dielectric component (3) is a ceramic component, and the first electrode component (1) and the dielectric component (3) are connected by ceramic sintering.

6. A detection device, characterized in that: The invention comprises the ionization source described in any one of claims 1 to 5.

7. The detection device according to claim 6, characterized in that The device further comprises a migration chamber (5) and an ion receiving plate (6), wherein the ion receiving plate (6) and the second electrode member (2) are spaced apart, and the migration chamber (5) is arranged between the ion receiving plate (6) and the second electrode member (2); the migration chamber (5) has a migration cavity for accommodating ions to be measured, and the migration cavity is in communication with the ion generating cavity (4); Wherein, in the ionization state, after the plasma on the ion generating chamber (4) side is converted into ions to be measured, it moves toward the ion receiving plate (6) via the migration chamber, and the ion receiving plate (6) is suitable for receiving the ions to be measured.

8. The detection device according to claim 7, characterized in that The invention also includes a reaction chamber (7), which is arranged between the second electrode member (2) and the migration chamber (5), and has a reaction chamber suitable for accommodating molecules of the object to be detected, the plasma, and ions to be detected generated after the two react; the reaction chamber is connected to the ion generating chamber (4).

9. The detection device according to claim 8, characterized in that The invention also includes an ion gate (8), which is arranged between the reaction chamber (7) and the migration chamber (5). The ion gate (8) has a sealed state for separating the reaction chamber and the migration chamber, and an open state for connecting the reaction chamber and the migration chamber. When the ion gate (8) is in the open state, the ions to be measured move from the reaction chamber through the migration chamber toward the ion receiving plate (6).

10. A detection system comprising an external power supply, a medium source, and the detection device according to any one of claims 7 to 9, wherein the medium source is connected to an ion generating chamber (4).

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