Detector

Abstract

A detector (100), comprising an atomization mechanism (10), a charge mechanism (20), an ion trap (30), and an electrostatic detection mechanism (40). The atomization mechanism (10) is provided with an atomization cavity (11) and used for introducing carrier gas and atomizing a sample to form a detection gas flow containing the atomized sample. The charge mechanism (20) is provided with a charge cavity (21) and used for charging the detection gas flow. The ion trap (30) is provided with a separation cavity (31) and used for separating charges carried by the carrier gas. The electrostatic detection mechanism (40) is used for detecting the quantity of charges carried by the detection gas flow outputted from the ion trap (30). The atomization cavity (11), the charge cavity (21), and the separation cavity (31) are sequentially connected and communicated to form a detection gas path for the detection gas flow to flow. The purpose of detection is achieved by means of a single detection gas path, thereby reducing the gas consumption and the degree of dilution of the sample by the carrier gas, narrowing the peak spread, and improving the sensitivity.

Description

detector Technical Field

[0001] The present application relates to the technical field of instruments and meters, and in particular to a detector. Background Art

[0002] One method for detecting the concentration of the component to be measured in a sample solution is to atomize the solution sample to form small droplets, charge them to form charged particles after drying, and finally capture the charged particles and measure the charge using an electrostatic meter. The resulting signal is directly proportional to the amount of the component to be measured in the sample solution, and the concentration of the component to be measured can be calculated.

[0003] In related technologies, the gas used in such a system is divided into two paths. One path is the carrier gas, which plays the role of two-fluid spray (gas part) and carries the sample into the collision cell; the other path is the collision gas, which plays the role of charging and charge transfer. This structure has many disadvantages: first, the introduction of collision gas may cause the aerosol containing the sample to be diluted, the peak to be broadened, and the sensitivity to be reduced; second, the dual gas paths also increase gas consumption. Summary of the Invention

[0004] Based on this, it is necessary to provide a detector that can improve detection sensitivity and reduce gas usage to address the above problems.

[0005] A detector, comprising:

[0006] an atomization mechanism having an atomization chamber and being used to introduce a carrier gas and atomize the sample to form the detection airflow containing the atomized sample in the atomization chamber;

[0007] a charging mechanism, disposed downstream of the atomizing mechanism along the flow direction of the detection airflow, having a charging chamber and configured to charge the detection airflow in the charging chamber;

[0008] an ion trap, disposed downstream of the charging mechanism along the flow direction of the detection airflow, and having a separation chamber, and configured to separate charges carried by the carrier gas and solvent molecules in the detection airflow within the separation chamber; and

[0009] an electrostatic detection mechanism, disposed downstream of the ion trap along the flow direction of the detection airflow and connected to the separation chamber, for detecting the amount of charge carried by the detection airflow containing the component to be measured output from the ion trap;

[0010] The atomizing chamber, the charging chamber, and the separation chamber are sequentially connected and communicated with each other to form a detection air path for the detection airflow to flow.

[0011] In one embodiment, the charging mechanism includes a first electrode and a second electrode. The first electrodes enclose the charging cavity. The second electrode is at least partially disposed in the charging cavity and is spaced apart from the first electrode.

[0012] In one embodiment, the ion trap includes a third electrode and a fourth electrode. The third electrode encloses the separation cavity. The fourth electrode is at least partially disposed in the separation cavity and is spaced apart from the third electrode.

[0013] In one embodiment, the detector further includes a cylinder, and the cylinder includes a first section and a second section in its axial direction, the first section forms the first electrode, and the second section forms the third electrode.

[0014] In one embodiment, the barrel is cylindrical, the second electrode and the fourth electrode are needle-shaped electrodes or rod-shaped electrodes, and both are arranged along the axis of the barrel.

[0015] In one embodiment, the detector is configured to selectively supply positive electricity or negative electricity to the second electrode and the fourth electrode.

[0016] In one embodiment, the detector further includes a limiting member, which is disposed between the charging chamber and the separation chamber to form a limiting through hole connecting the charging chamber and the separation chamber.

[0017] In one embodiment, the limiting member is formed with a guide channel, the guide channel is at least partially tapered in the flow direction of the detection airflow, and the limiting through hole is formed at the end of the guide channel in the flow direction.

[0018] In one embodiment, the electrostatic detection mechanism includes a charge capture structure, and the charge capture structure is a metal powder sintered filter element.

[0019] In one embodiment, the detector further includes a drying tube, which is disposed between the atomization mechanism and the charging mechanism, connects the atomization chamber and the charging chamber, and is used to dry the detection airflow flowing therethrough.

[0020] The detector described above utilizes a redesigned gas path, achieving detection through a single detection gas path, reducing gas consumption. This reduced gas consumption also naturally reduces sample dilution by the carrier gas, narrowing the peak spread and improving sensitivity. The detection gas flow is directly charged and enters the ion trap, shortening its path and reducing dead volume. This significantly reduces the amount of charge lost by the charged sample due to collisions with the sidewalls, which is a key factor in the increased sensitivity. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] FIG1 is a schematic diagram of the structure of a detector in one embodiment of the present application.

[0023] FIG2 is a schematic diagram of the detection gas path in the detector shown in FIG1 .

[0024] FIG3 is a chromatogram obtained when the detector shown in FIG1 detects a sample whose component to be determined is fatty acid.

[0025] FIG4 is a chromatogram obtained when a sample whose component to be determined is fatty acid is detected by a detection scheme in the related art.

[0026] FIG5 is a chromatogram obtained when the detector shown in FIG1 detects a sample in which the component to be determined is notoginsenoside.

[0027] FIG6 is a chromatogram obtained when a sample whose component to be determined is notoginsenoside is detected by the detection scheme in the related art.

[0028] Explanation of the accompanying reference numerals: 100, detector; 10, atomization mechanism; 11, atomization chamber; 20, charging mechanism; 21, charging chamber; 22, first electrode; 23, second electrode; 30, ion trap; 31, separation chamber; 32, third electrode; 33, fourth electrode; 40, electrostatic detection mechanism; 50, drying tube; 60, cylinder; 61, first section; 62, second section; 70, limiting member; 71, limiting through hole; 72, flow guide channel. DETAILED DESCRIPTION

[0029] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0030] In the description of this application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0031] In addition, if the term "and / or" appears, "and / or" is merely a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent three situations: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the objects associated with each other are in an "or" relationship. If the terms "first" and "second" appear, these terms are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "multiple" appears, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0032] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connected," "fixed," etc., should be interpreted broadly. For example, these terms may refer to fixed connections, removable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediary; and internal communication between two components or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0033] In this application, unless otherwise expressly specified or limited, if a first feature is described as being "above" or "below" a second feature, or similar descriptions, this may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is described as being "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is described as being "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0034] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only embodiment.

[0035] In addition to the problems described in the background technology, the dual gas path design in the related technology may also have the following problems: the dual gas path structure requires precise control of the size of the two gases, which complicates the airflow control and gas path structure; the collision process also causes some separated samples to be mixed back, resulting in a decrease in separation, and the gas consumption can reach 4L / min-5L / min; the indirect charging method is to first ionize the nitrogen and then charge the sample aerosol through transfer, which affects the efficiency and ultimately the sensitivity.

[0036] 1 and 2 , a detector 100 provided in one embodiment of the present application includes an atomization mechanism 10 , a charging mechanism 20 , an ion trap 30 , and an electrostatic detection mechanism 40 .

[0037] The atomization mechanism 10 has an atomization chamber 11 and is used to introduce carrier gas and atomize the sample to form a detection airflow containing the atomized sample in the atomization chamber 11 .

[0038] The sample may refer to a sample solution containing the component to be measured. The component to be measured is atomized and then flows with the carrier gas to form a detection gas flow, which is an aerosol and includes the carrier gas, solvent, and the component to be measured. Specifically, the component to be measured may be, but is not limited to, a non-volatile solute. The carrier gas may be, but is not limited to, nitrogen, and sample atomization may be achieved using a two-fluid spray method or other methods.

[0039] The charging mechanism 20 is disposed downstream of the atomizing mechanism 10 along the flow direction of the detection airflow, and has a charging chamber 21 . The charging mechanism 20 is configured to charge the detection airflow in the charging chamber 21 .

[0040] As can be understood, the charging mechanism 20 is capable of receiving the test airflow released downstream by the atomization mechanism 10 and charging the test airflow. Charging refers to charging particles in the test airflow. The charged particles include aerosol particles of the component to be measured, as well as carrier gas molecules and solvent molecules. Specifically, charging can be achieved through discharge, which can take the form of glow discharge, corona discharge, dielectric barrier discharge, etc.

[0041] The ion trap 30 is disposed downstream of the charging mechanism 20 along the flow direction of the detection airflow and has a separation chamber 31 for separating the charges carried by the carrier gas and solvent molecules in the detection airflow in the separation chamber 31 .

[0042] The ion trap 30 receives the test airflow charged by the charging mechanism 20 downstream and is configured to generate a trap electric field within the separation chamber 31. It is known that the molecular mass of the carrier gas molecules and the solvent molecules of the sample solution used is much smaller than the mass of the aerosol particles containing the components to be measured. When the charged carrier gas molecules pass through the trap electric field, they are significantly deflected by the electric field force and eventually collide with the sidewalls, where the charge they carry is transferred and neutralized. In other words, the charge carried by the carrier gas and solvent molecules is separated and captured by the ion trap 30. As for the charged aerosol particles of the components to be measured, although they are also affected by the electric field force when passing through the trap electric field, due to their large mass and momentum, the acceleration of their deflection is much smaller than that of the charged carrier gas, resulting in less significant deflection and allowing them to smoothly follow the neutral carrier gas through the trap electric field.

[0043] The electrostatic detection mechanism 40 is disposed downstream of the ion trap 30 along the flow direction of the detection airflow and communicates with the separation chamber 31 for detecting the charge carried by the detection airflow containing the component to be measured outputted from the ion trap 30 .

[0044] The electrostatic detection mechanism 40 receives the test airflow downstream, separated by the ion trap 30. As the charge carried by the carrier gas and solvent molecules in the test airflow is separated by the ion trap 30, the electrostatic detection mechanism 40 can more accurately capture the charge carried by the aerosol particles containing the component to be measured in the test airflow, thereby measuring the charge of all aerosols containing the component to be measured. Because the test airflow is separated by the ion trap 30, the charge carried by the charged carrier gas molecules is pre-transferred. Therefore, the electrostatic detection mechanism 40 can more accurately capture the charge carried by the aerosol particles of the component to be measured, convert it into a voltage or current signal, and transmit it to the host computer software, thereby determining the concentration of the component to be measured in the sample solution.

[0045] The atomizing chamber 11 , the charging chamber 21 and the separating chamber 31 are sequentially connected and communicated to form a detection air path for the detection airflow to flow. The flow of the detection airflow is shown by the arrows in FIG. 1 .

[0046] The test airflow flows within a single air path, the test air path, from its generation to its arrival at the electrostatic detection mechanism 40 for detection. Specifically, the test airflow is generated in the atomization chamber 11, flows to the downstream charging chamber 21, where it is charged. It then passes through the separation chamber 31, where the carrier gas charge is separated, before entering the electrostatic detection mechanism 40 for detection.

[0047] In one embodiment, the detector 100 may be, but is not limited to, a chromatographic detector or a charged aerosol detector (CAD).

[0048] The above-mentioned detector 100 has a redesigned gas path, and can achieve the detection purpose only through a single detection gas path, thereby reducing gas consumption. While the gas consumption is reduced, the degree of dilution of the sample by the carrier gas is naturally reduced, the peak spread is narrowed, and the sensitivity is improved. After the detection airflow is directly charged, it can directly enter the ion trap 30, its path is shortened, the dead volume is reduced, and the amount of charge lost by the charged sample colliding with the side wall is also greatly reduced, which is also an important reason for the increase in sensitivity. In addition, the elimination of collision airflow greatly reduces gas consumption, while also avoiding the problem of reduced separation due to back mixing that may be caused by collision charging. The design of a single gas path makes the structure of the detector 100 simpler, reduces the gas control unit, and reduces the difficulty of control.

[0049] In some embodiments, the detector 100 further includes a drying tube 50 , which is disposed between the atomization mechanism 10 and the charging mechanism 20 , connects the atomization chamber 11 and the charging chamber 21 , and is used to dry the detection airflow flowing therethrough to eliminate the liquid water contained therein.

[0050] Drying tube 50 is located downstream of atomizing mechanism 10 and upstream of charging mechanism 20 along the flow direction of the test airflow. One end of drying tube 50 connects to atomizing chamber 11, and the other end connects to charging chamber 21. The test airflow flows from atomizing chamber 11 into drying tube 50, where it is dried before flowing into charging chamber 21.

[0051] The detector 100 flow is charged after being dried, which can improve the stability of charged migration in the subsequent process, and can form Coulomb explosion through charge accumulation during the charging process, thereby further refining the aerosol of the component to be measured.

[0052] In some embodiments, the charging mechanism 20 includes a first electrode 22 and a second electrode 23 . The first electrode 22 encloses a charging cavity 21 . The second electrode 23 is at least partially disposed in the charging cavity 21 and spaced apart from the first electrode 22 .

[0053] Among them, the first electrode 22 and the second electrode 23 can be connected to opposite potentials, or the first electrode 22 can be grounded and the second electrode 23 can be connected to high voltage positive or negative electricity, etc., and the polarity can be switched as needed. It is only necessary to form a sufficient potential difference between the first electrode 22 and the second electrode 23 to discharge and charge the detected airflow. No specific limitation is made here.

[0054] In this way, the detection airflow entering the charging chamber 21 can directly contact the discharge needle, so that the charge conduction efficiency is greatly improved and the proportion of the particles of the component to be measured that are charged increases.

[0055] Furthermore, the ion trap 30 includes a third electrode 32 and a fourth electrode 33 . The third electrode 32 encloses a separation cavity 31 . The fourth electrode 33 is at least partially disposed in the separation cavity 31 and spaced apart from the third electrode 32 .

[0056] Among them, the third electrode 32 and the fourth electrode 33 can be connected to opposite potentials, or the third electrode 32 can be grounded and the fourth electrode 33 can be connected to positive or negative electricity, etc., and the polarity can be switched as needed. It is only necessary to form a sufficient potential difference between the third electrode 32 and the fourth electrode 33 to form a trap electric field and separate the charges carried by the carrier gas. No specific limitation is made here.

[0057] In this way, a trap electric field can be formed between the third electrode 32 and the fourth electrode 33, so that all charged particles in the detection airflow entering the separator formed by the third electrode 32 can be placed in the trap electric field, affected by the electric field force, and then fully deviate from the charged carrier gas and separate, so that they collide with the third electrode 32 and are neutralized.

[0058] Furthermore, the detector 100 further includes a cylinder 60 , which includes a first section 61 and a second section 62 in its axial direction. The first section 61 is formed as the first electrode 22 , and the second section 62 is formed as the third electrode 32 .

[0059] It can be understood that the cylinder 60 can be made of conductive materials such as metal, and can be, but not limited to, cylindrical, square cylindrical, etc., and its different sections in its own axial direction are used to serve as the first electrode 22 and the third electrode 32 respectively. Therefore, the grounding of the cylinder 60 means that the first electrode 22 and the third electrode 32 are grounded at the same time.

[0060] In this way, the first electrode 22 and the third electrode 32 can be electrically connected together, simplifying the structure of the detector 100. The charging chamber 21 and the separation chamber 31 formed by the first electrode 22 and the third electrode 32 correspond to different spatial regions within the cylinder 60. The detection airflow flowing within the cylinder 60 can reach the separation chamber 31 from the charging chamber 21, greatly shortening the distance.

[0061] In some embodiments, the barrel 60 is cylindrical, and the second electrode 23 and the fourth electrode 33 are needle-shaped electrodes or rod-shaped electrodes, and both are disposed along the axis of the barrel 60 .

[0062] The barrel 60 is cylindrical, the second electrode 23 and the fourth electrode 33 are arranged along the axis of the barrel 60 , the first section 61 of the barrel 60 surrounds at least a portion of the second electrode 23 , and the second section 62 of the barrel 60 surrounds at least a portion of the fourth electrode 33 .

[0063] Thus, forming the second electrode 23 as a needle-shaped electrode helps to define the electric field lines and reduce the difficulty of discharge. Forming the fourth electrode 33 as a needle-shaped electrode can cooperate with the cylindrical third electrode 32 to form a more uniform electric field.

[0064] In some embodiments, the detector 100 is configured to selectively supply positive or negative electricity to the second electrode 23 and the fourth electrode 33 .

[0065] In other words, the second electrode 23 can be connected to a positive or negative charge as needed, and can switch between positive and negative charges as needed. Correspondingly, in order to form a corresponding trap electric field, the fourth electrode 33 can also be connected to a positive or negative charge as needed, and can switch between positive and negative charges as needed. At the same time, it can be understood that the first electrode 22, as a counter electrode to the second electrode 23, can be connected to an electrode with an opposite electrical property to the second electrode 23 or to the ground, and the third electrode 32, as a counter electrode to the fourth electrode 33, can be connected to an electrode with an opposite electrical property to the fourth electrode 33 or to the ground. When the first electrode 22 is connected to an electrical property opposite to the second electrode 23, and the third electrode 32 is connected to an electrical property opposite to the fourth electrode 33, after the second electrode 23 and the fourth electrode 33 change the properties of the connected electrodes, the first electrode 22 and the third electrode 32 change the properties of the connected electrodes accordingly.

[0066] In this way, the detector 100 can select appropriate electrical properties of the second electrode 23 according to different components to be measured, so that the aerosol particles to be measured are charged with appropriate charges, which is beneficial for detection.

[0067] In some embodiments, the detector 100 further includes a limiting member 70 , which is disposed between the charging chamber 21 and the separation chamber 31 to form a limiting through hole 71 connecting the charging chamber 21 and the separation chamber 31 .

[0068] It can be understood that the detection airflow can only enter the separation chamber 31 through the limiting through hole 71. The limiting through hole 71 is used to limit the position where the detection airflow enters the separation chamber 31. The limiting member 70 can be made of insulating material.

[0069] In this way, by reasonably configuring the position of the limiting through hole 71, the detection airflow can enter the trap electric field at a suitable position and angle, reducing the probability of charge being transferred due to collision with the third electrode 32 caused by the airflow itself, which helps to reduce charge loss and improve the sensitivity of the detector 100.

[0070] Furthermore, the limiting member 70 is formed with a guide channel 72 , which is at least partially tapered in the flow direction of the detection airflow, and the limiting through hole 71 is formed at the end of the guide channel 72 in the flow direction.

[0071] In other words, the flow channel 72 is trumpet-shaped, with the largest flow area connecting to the charging chamber 21, and the smallest flow area forming a restriction hole 71 connecting to the separation chamber 31. Specifically, the restriction member 70 can be disposed within the cylindrical body 60, with one end facing the charging chamber 21 and having the same diameter as the charging chamber 21, and the other end facing the separation chamber 31.

[0072] In this way, the detection airflow can enter the charging chamber 21 under the guidance of the guide channel 72, and under the action of the tapered guide channel 72, the detection airflow can be more concentrated and away from the third electrode 32, so as to reduce the probability of directly or too quickly colliding with the third electrode 32 due to being too close to the third electrode 32 during the flow process.

[0073] Specifically, the electrode property connected to the fourth electrode 33 is the same as the charge property of the detected airflow after charging. The guide channel 72 is set along the axis of the barrel body, and the axis of the limiting through hole 71 coincides with the axis of the barrel body.

[0074] In some embodiments, the static electricity detection mechanism 40 includes a charge capture structure (not shown), which is a metal powder sintered filter element.

[0075] The charge capture structure is connected to the downstream of the ion trap 30 . The detection gas flow output from the ion trap 30 flows into the charge capture structure. When the charged particles contact the charge capture structure, the charge is transferred to the charge capture structure and detected.

[0076] Sintered metal powder filter elements offer the advantages of a large conductive area and corrosion resistance. Their inherent thickness provides stability and eliminates the need for external support or fillers. The pore size created by sintering metal powder can be customized. Furthermore, sintered metal powder filter elements have the advantages of a mature industry chain and easy availability.

[0077] Specifically, the charge capture structure can be formed by sintering metal powders such as stainless steel, titanium, copper, monel, Hastelloy, and aluminum, and can be sintered to form a filter element with a pore size of 0.1 micron to 500 microns as needed. It is understood that in other embodiments, the charge capture structure can also be a metal mesh.

[0078] The detector 100 introduces carrier gas through the atomization mechanism 10 and atomizes the sample to form a detection airflow. The detection airflow flows downstream, passes through the drying tube 50 for drying, and then enters the charging chamber 21 of the charging mechanism 20, where it is located between the first electrode 22 and the second electrode 23. The charged detection airflow continues to flow along the cylinder 60, gradually converging under the guidance of the flow channel 72 of the restrictor 70. It then passes through the restricting through-hole 71 and flows along the axis of the cylinder 60 into the separation chamber 31, where it is located between the third electrode 32 and the fourth electrode 33. The charged carrier gas molecules, under the influence of the trapped electric field between the third and fourth electrodes 32, 33, collide with the third electrode 32, where their charge is transferred and the carrier gas molecules return to neutral state. Meanwhile, the charged aerosol particles of the component to be measured can follow the neutral carrier gas, smoothly passing through the ion trap 30, and ultimately flowing to the electrostatic detection mechanism 40. The detection airflow entering the electrostatic detection mechanism 40 enters the metal powder sintered filter element. The charged aerosol particles of the component to be measured collide with the metal powder sintered filter element, and the charge they carry is transferred to the metal powder sintered filter element and detected.

[0079] Referring to Figures 3 and 4 , for a sample containing fatty acids as an example, detector 100 and a related art detection solution were used to analyze the same sample under the same chromatographic conditions. The results are as follows: the main chromatogram of the related art detection solution has a peak height of 480 mV and a peak area of ​​107.7764; the chromatogram of detector 100 has a peak height of 153.4421 mV and a peak area of ​​153.4421. This indicates that detector 100 increases the response by approximately 50%.

[0080] Please refer to FIG5 and FIG6. Taking a sample in which the component to be determined is notoginsenoside as an example, the detector 100 and the detection scheme in the related art analyze and test the same sample under the same chromatographic conditions, and the results are shown in the figure.

[0081] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0082] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A detector, characterized in that: The detector comprises: An atomizing mechanism (10) has an atomizing chamber (11) and is used to introduce a carrier gas and atomize the sample to form the detection airflow containing the atomized sample in the atomizing chamber (11); a charging mechanism (20) disposed downstream of the atomizing mechanism (10) along the flow direction of the detection airflow, having a charging chamber (21), and configured to charge the detection airflow in the charging chamber (21); an ion trap (30) disposed downstream of the charging mechanism (20) along the flow direction of the detection airflow, and having a separation chamber (31) for separating the charges carried by the carrier gas and solvent molecules in the detection airflow within the separation chamber (31); and an electrostatic detection mechanism (40), disposed downstream of the ion trap (30) along the flow direction of the detection airflow and connected to the separation chamber (31), for detecting the amount of charge carried by the detection airflow containing the component to be measured output from the ion trap (30); The atomizing chamber (11), the charging chamber (21), and the separation chamber (31) are sequentially connected and communicated to form a detection air path for the detection airflow to flow.

2. The detector according to claim 1, characterized in that The charging mechanism (20) includes a first electrode (22) and a second electrode (23), wherein the first electrode (22) encloses the charging cavity (21), and the second electrode (23) is at least partially disposed in the charging cavity (21) and spaced apart from the first electrode (22).

3. The detector according to claim 2, characterized in that The ion trap (30) comprises a third electrode (32) and a fourth electrode (33), wherein the third electrode (32) encloses the separation chamber (31), and the fourth electrode (33) is at least partially disposed in the separation chamber (31) and spaced apart from the third electrode (32).

4. The detector according to claim 3, characterized in that The detector further comprises a cylinder (60), wherein the cylinder (60) comprises a first section (61) and a second section (62) in its axial direction, wherein the first section (61) is formed as the first electrode (22), and the second section (62) is formed as the third electrode (32).

5. The detector according to claim 4, characterized in that The cylinder (60) is cylindrical, and the second electrode (23) and the fourth electrode (33) are both needle-shaped electrodes or rod-shaped electrodes, and both are arranged along the axis of the cylinder (60).

6. The detector according to claim 4, characterized in that The detector is configured to selectively supply positive electricity or negative electricity to the second electrode (23) and the fourth electrode (33).

7. The detector according to any one of claims 1 to 6, characterized in that The detector further comprises a limiting member (70), wherein the limiting member (70) is arranged between the charging chamber (21) and the separation chamber (31) to form a limiting through hole (71) connecting the charging chamber (21) and the separation chamber (31).

8. The detector according to claim 7, characterized in that The limiting member (70) is formed with a guide channel (72), the guide channel (72) is at least partially tapered in the flow direction of the detection airflow, and the limiting through hole (71) is formed at the end of the guide channel (72) in the flow direction.

9. The detector according to any one of claims 1 to 6, characterized in that: The static electricity detection mechanism (40) comprises a charge capture structure, and the charge capture structure is a metal powder sintered filter element.

10. The detector according to any one of claims 1 to 6, characterized in that: The detector further comprises a drying tube (50), which is arranged between the atomizing mechanism (10) and the charging mechanism (20), connects the atomizing chamber (11) and the charging chamber (21), and is used to dry the detection airflow flowing therethrough.

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