Ion mobility tube with automatic adjustment of peak stable range

Abstract

The utility model discloses a kind of ion migration pipe of peak value stable range automatic regulation, it is related to ion migration pipe technical field;The drift gas pipe of dryer is connected with the migration area of ion migration pipe body, the gas outlet of ion migration pipe body is connected with the gas inlet pipe of dryer by back gas pipe, the discharge pipe of dryer is connected with the import of two flow rate sensors respectively, the import of two gas pumps is connected with the export of two flow rate sensors respectively, the export of a gas pump is transported to pyrolysis resolver by calibrant container with calibrant, the export of another gas pump is transported to pyrolysis resolver by the object to be examined sampler with the object to be examined, pyrolysis resolver is connected with the ionization area import of ion migration pipe, two flow rate sensors are electrically connected with feedback processing module respectively, feedback processing module is connected with control mechanism, the peak value of the ion peak of the utility model is stable, and range is automatically regulated, controllability is strong, the content range of the object to be examined of detection target is big, identification is accurate, application is convenient.

Description

Technical Field

[0001] This invention belongs to the field of ion migration tube technology, specifically relating to an ion migration tube with automatic peak stability range adjustment. Background Technology

[0002] In explosion-proof, counter-terrorism, and security inspection systems, the core technology commonly used in instruments and equipment for explosives and drugs is material ion migration technology. The principle is to detect the speed of material ions and identify the substance based on the speed.

[0003] like Figure 1 As shown, the principle of ion migration is explained as follows: Ions carrying a positive charge are positive ions, and those carrying a negative charge are negative ions; when ions are placed in an electric field, they move under the influence of the electric field; by measuring the velocity of the ions, the ion mobility can be obtained, which is related to the atomic structure of the substance, thereby identifying the substance.

[0004] Ion migration tube working principle: In practical applications, an ion migration tube consists of the following parts: injector, ionization region, ion gate, migration region, and collection region, such as... Figure 2 As shown, Sampler: Samples the substance to be tested and introduces it into the ionization region of the instrument.

[0005] Ionization region: The substance to be tested is ionized by ultraviolet light. According to the atomic properties of the substance, explosives are ionized into negative ions, and drugs are ionized into positive ions.

[0006] Ion gate: Ions in the ionization region pass through the ion gate to the migration region. The opening and closing of the ion gate controls the timing and number of ions passing through.

[0007] Migration region: When an electric field is applied outside the migration region, ions move to the other side under the influence of the electric field in the migration region.

[0008] Collection area: Ions move to the flange in the collection area, the flange absorbs the charge and forms an electron flow, the electron flow is amplified and sent to the computing unit, and combined with the control of the ion gate, the migration speed of the ions is calculated.

[0009] There are two types of ion peaks in the ion migration tube: calibration peak and detection peak.

[0010] The calibration peak is used to reflect the current working environment of the ion migration tube, including ionization source capability, migration voltage, substance concentration, gas flow rate, temperature, humidity, gas pressure, and electrical signal amplification and processing. Changes in these environmental parameters will affect the peak position and peak value of the calibration peak. Using this as a reference, the analyte can be accurately measured and judged.

[0011] The detected peak is the ion peak generated after the analyte is ionized. It is similarly, consistently, and synchronously affected by the above-mentioned environmental parameters. However, the content and properties of the analyte are unknown. Therefore, the stability of the calibration peak and the detected peak are crucial and important for the accuracy of the equipment in detecting the analyte.

[0012] The position and peak value of existing ion peaks are affected by the above-mentioned factors.

[0013] The original calibration peak principle achieves peak position calibration. That is, when these factors affect the ion peak position, the calibration peak and the detected peak are also affected, and the effect is consistent. Based on this correlation, the actual peak position of the detected peak can be obtained through a series of calculations, so as to achieve the purpose of accurately identifying the analyte.

[0014] However, as Figure 6 As shown, traditional ion migration tubes cannot determine the content of the analyte by calibrating the peaks because the content of the analyte is unknown before detection. This makes it impossible to adjust the number of peaks emitted by the ion migration tube, especially when the analyte has a wide range. For example, small doses of analyte may not produce any ion peaks, while large doses may have ion peaks exceeding the data limit, making calculation impossible. Even if the amplification factor of the electrical signal can be adjusted, there are two drawbacks: first, temporary adjustments are not allowed in time; and second, ion accumulation can cause peak position shifts and obscure peak tips.

[0015] 1. Low-dose ion peak conditions, such as Figure 3 As shown, the peak value of low doses is too low, limiting its recognition.

[0016] 2. High-dose ion peak conditions, such as... Figure 4 As shown, the peak value of high doses is too high, exceeding the limit, and there is no peak tip.

[0017] 3. Adjust the (+-) electrical signal amplification factor, such as... Figure 5 As shown, ions are stacked, the baseline value is high, and the peaks are disordered.

[0018] For the reasons mentioned above, equipment using traditional ion migration tubes must control the content of the analyte as much as possible during testing, and dare not exceed the limit. After testing, a cleaning time of 10 to 30 minutes is required to remove residues and avoid affecting the next test. Utility Model Content

[0019] To address the problems mentioned in the background section, the purpose of this invention is to provide an ion migration tube with automatic peak stability range adjustment.

[0020] This invention relates to an ion migration tube with automatic peak stability range adjustment, comprising an ion migration tube body, a thermal desorber, a dryer, an air pump, a flow rate sensor, a feedback processing module, and a control mechanism. The drift gas pipe of the dryer is connected to the migration zone of the ion migration tube body. The outlet of the ion migration tube body is connected to the inlet pipe of the dryer via a return gas pipe. The outlet pipe of the dryer is connected to the inlet of two flow rate sensors, and the outlets of the two flow rate sensors are connected to the inlet of two air pumps, respectively. The outlet of one air pump delivers calibrator to the thermal desorber via a calibrator container, and the outlet of the other air pump delivers the test sample to the thermal desorber via a test sampler. The thermal desorber is connected to the inlet of the ionization zone of the ion migration tube. The two flow rate sensors are electrically connected to the feedback processing module, and the feedback processing module is connected to the control mechanism.

[0021] As a preferred embodiment, the control mechanism includes a sampling amplification mechanism, a central processing unit, a display and communication mechanism, a high-voltage mechanism, and a power supply mechanism. The sampling amplification mechanism is electrically connected to the central processing unit, the central processing unit is electrically connected to the display and communication mechanism, and the power supply mechanism is connected to the high-voltage mechanism to supply power to the device.

[0022] As a preferred embodiment, the air pump is a feedback micro air pump.

[0023] Compared with the prior art, the advantages of this utility model are: the peak value of the ion peak is stable, the range is automatically adjusted, the controllability is strong, the content range of the target analyte is large, the identification is accurate, and the application is convenient.

[0024] I. This utility model adds a flow rate sensor and an air pump to the air inlet section, so that both the calibrator air path and the test air path have an independent "air pump-flow rate sensor", thereby realizing controllable flow rate and content concentration of the calibrator and the test.

[0025] Second, in the electrical part of this utility model, a flow rate sensor feedback path is added to achieve the above-mentioned controllability in the circuit. Attached Figure Description

[0026] For ease of explanation, the present invention will be described in detail below with reference to specific embodiments and accompanying drawings.

[0027] Figure 1 This is a schematic diagram of the principle of ion migration technology in existing technologies; Figure 2 This is a schematic diagram illustrating the working principle of an ion migration tube in the prior art. Figure 3 This is a schematic diagram of the low-dose ion peak characteristics in existing technologies; Figure 4 This is a schematic diagram of high-dose ion peaks in existing technologies; Figure 5This is a schematic diagram illustrating the adjustment of the (+-) electrical signal amplification factor in the prior art; Figure 6 This is a structural diagram of the existing technology; Figure 7 This is a schematic diagram of the structure of this utility model; Figure 8 This is a flowchart of particle transport and conversion in this utility model; Figure 9 This is a flowchart of the automatic peak stabilization and automatic range adjustment processes in this utility model; Figure 10 This is a system block diagram of the present invention; Figure 11 This is a schematic diagram of the ion migration spectrum at low and medium doses according to this invention. Figure 12 This is a schematic diagram of the ion migration spectrum at high doses in this invention. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model is described below with reference to specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are merely exemplary and not intended to limit the scope of this utility model. The structures, proportions, sizes, etc., illustrated in the accompanying drawings are only for illustrative purposes to aid those skilled in the art and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effects and objectives achieved by this utility model, should still fall within the scope of the technical content disclosed in this utility model. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of this utility model.

[0029] It should also be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and / or processing steps closely related to the solution according to the present invention are shown in the accompanying drawings, while other details that are not closely related to the present invention are omitted.

[0030] Specific implementation method one: Combining Figures 7 to 12This embodiment illustrates the specific implementation method. This embodiment achieves controllable flow rates and concentrations of the calibrator and the test analyte by adding an air pump and a flow rate sensor. The specific implementation method employs the following technical solution: it includes an ion migration tube, a thermal desorber, a dryer, an air pump, a flow rate sensor, a feedback processing module, and a control mechanism. The drift gas pipe of the dryer is connected to the migration zone of the ion migration tube. The outlet of the ion migration tube is connected to the inlet of the dryer via a return gas pipe. The outlet pipe of the dryer is connected to the inlet of two flow rate sensors. The outlets of the two flow rate sensors are connected to the inlets of two air pumps. The outlet of one air pump delivers the calibrator to the thermal desorber through a calibrator container, and the outlet of the other air pump delivers the test analyte to the thermal desorber through a test analyte sampler. The air pump is a feedback-type micro air pump. The thermal desorber is connected to the inlet of the ionization zone of the ion migration tube. The two flow rate sensors are electrically connected to the feedback processing module, and the feedback processing module is connected to the control mechanism.

[0031] In this specific implementation, a gas pump and a flow rate sensor are connected in series in the calibrator injection gas path and the test sample injection gas path. Based on the feedback of the actual flow rate and the peak value of the calibration peak, the gas pump flow rate is adjusted. This achieves two goals: first, it stabilizes the peak value of the ion peak; second, it keeps the peak value of the calibration peak at the midpoint of the range. When it deviates (high or low), the gas pump is automatically adjusted to bring the peak value of the calibration peak back to the midpoint of the range, thus realizing automatic range adjustment.

[0032] In this specific embodiment, a flow rate sensor and an air pump are added to the air intake section, so that both the calibrator gas path and the test gas path have an independent "air pump-flow rate sensor", thereby achieving controllable flow rate and concentration of both the calibrator and the test. In the electrical section, a flow rate sensor feedback path is added to achieve the above-mentioned controllability in the circuit, and a corresponding computing unit is also added.

[0033] Specific Implementation Method Two: Combining Figure 10 The illustration shows this specific embodiment, which is a further limitation of Specific Embodiment 1. The control mechanism in this specific embodiment includes a sampling amplification mechanism, a central processing unit, a display and communication mechanism, a high voltage mechanism, and a power supply mechanism. The sampling amplification mechanism is electrically connected to the central processing unit, the central processing unit is electrically connected to the display and communication mechanism, and the power supply mechanism is connected to the high voltage mechanism to supply power to the device.

[0034] In this specific embodiment, the particle transport and conversion process is as follows: Figure 8 As shown, the automatic peak stabilization and automatic range adjustment processing flow is as follows: Figure 9 As shown, it adjusts the speed of the air pump and the range of measurement based on the peak value, and realizes primary and secondary feedback.

[0035] In this specific embodiment, as follows: Figure 11As shown, the ion migration spectrum at low doses (peak 50) is as follows. Figure 12 As shown, the ion migration spectrum at high doses (peak value 50000) shows that the peak value of the ion peak is stable.

[0036] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention.

[0037] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An ion migration tube with automatic peak stability range adjustment, characterized in that: The system includes an ion migration tube, a thermal desorber, a dryer, an air pump, a flow sensor, a feedback processing module, and a control mechanism. The drift gas pipe of the dryer is connected to the migration zone of the ion migration tube. The outlet of the ion migration tube is connected to the inlet of the dryer via a return gas pipe. The outlet pipe of the dryer is connected to the inlet of two flow sensors. The outlets of the two flow sensors are connected to the inlets of two air pumps. The outlet of one air pump delivers calibrators to the thermal desorber via a calibrator container, and the outlet of the other air pump delivers the test sample to the thermal desorber via a test sampler. The thermal desorber is connected to the inlet of the ionization zone of the ion migration tube. The two flow sensors are electrically connected to the feedback processing module, which is connected to the control mechanism.

2. The ion migration tube with automatic peak stability range adjustment according to claim 1, characterized in that: The control mechanism includes a sampling amplification mechanism, a central processing unit, a display and communication mechanism, a high-voltage mechanism, and a power supply mechanism. The sampling amplification mechanism is electrically connected to the central processing unit, the central processing unit is electrically connected to the display and communication mechanism, and the power supply mechanism is connected to the high-voltage mechanism to supply power to the device.

3. The ion migration tube with automatic peak stability range adjustment according to claim 1, characterized in that: The air pump is a feedback micro air pump.

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