Sampling device, analysis system and method for detecting wiping paper

Abstract

Provided are a sample introduction device, an analysis system, and a method for detecting a wiping paper. The sample introduction device includes: a first switching device adapted to allow a sample gas in an external aerosol state to flow from a common port of the first switching device to a first port of the first switching device; a heating tube adapted to heat the sample gas from the first port of the first switching device into a detection gas; a suction device adapted to suck the sample gas into the heating tube; and a second switching device adapted to allow a carrier gas to flow from a common port of the second switching device to a first port of the second switching device and be delivered to the heating tube to blow the detection gas in the heating tube to a gas detection device. By using the heating tube to heat the sample gas in an aerosol state, the use of a semi-permeable membrane is avoided, but the slow temperature rise and interference removal characteristics of semi-permeable membrane sample introduction are maintained.

Description

Technical Field

[0001] Embodiments of the present disclosure relate to a system for detecting an article based on a wiping technique, and particularly to a sampling device, an analysis system, and a method for detecting a wiping paper suitable for the wiping paper. Background Art

[0002] Currently, a gas detection device based on a cluster gas chromatography tandem ion mobility spectrometry technology can basically meet the rapid non-opening inspection work of animals, plants, and foods in the passenger inspection and cargo inspection channels of the customs. In such a gas detection device, through the preliminary separation by chromatography and then the secondary separation by an ion mobility system, two-dimensional data composed of a retention time and a migration time of a substance to be detected will be obtained. Since the polarities of different substances and the collision cross-sectional areas of ions are not exactly the same, a good distinction will be obtained.

[0003] However, the existing ion mobility spectrometers are sensitive to the air pressure and air flow of the sample gas, so a semi-permeable membrane is used as a gas path isolation to avoid the air flow impact of the directly sampled sample gas. However, with heating, the concentration of the substance to be detected in the sample gas does not rise instantaneously, but rises slowly. After diffusing to the other side of the semi-permeable membrane, among the previously volatilized components, the sample gas with a concentration lower than the detection limit has been inhaled into the detector and does not generate an available signal, even if their accumulation amount meets the alarm requirement, resulting in a reduction in the sensitivity of the ion mobility spectrometer and false negatives. On the other hand, even if a sample gas enrichment operation based on a semi-permeable membrane is performed, according to the laws of thermodynamics, the substances on both sides of the semi-permeable membrane reach an equilibrium state of partial pressure through free diffusion and will not spontaneously enrich into the detection gas path, resulting in a loss of about half of the samples.

[0004] Direct aspiration sampling will cause an impact on the air flow of the analysis gas path, resulting in the unusability of the spectrum with the strongest signal during injection. Moreover, the existing mechanical valve components cannot achieve the reproducibility of the air pressure requirements of the ion mobility tube. In this way, it is easy to only perform qualitative detection using the trace substances to be detected remaining in the pipeline after the air pressure is stable, reducing the sensitivity. If forced analysis of the strongest signal after injection is performed, the uncertainty of the peak position may cause false positives. Summary of the Invention

[0005] The purpose of the present disclosure aims to solve at least one aspect of the above problems and defects existing in the prior art.

[0006] According to an embodiment of one aspect of the present disclosure, there is provided a sample introduction device, including: a first switching device adapted to allow a sample gas in an external aerosol state to flow from a common port of the first switching device to a first port of the first switching device; a heating tube adapted to heat the sample gas from the first port of the first switching device into a detection gas; a suction device adapted to suck the sample gas into the heating tube; and a second switching device adapted to allow a carrier gas to flow from a common port of the second switching device to a first port of the second switching device and be delivered to the heating tube to blow the detection gas in the heating tube to a gas detection device.

[0007] According to an embodiment of the present disclosure, the sample introduction device further includes a blowing device adapted to blow a cleaning gas from a second port of the first switching device to the common port of the first switching device.

[0008] According to an embodiment of the present disclosure, a first valve is provided between the blowing device and the second port of the first switching device.

[0009] According to an embodiment of the present disclosure, a first three-way joint communicating with each other is provided between the first port of the first switching device, the first port of the second switching device, and the inlet of the heating tube.

[0010] According to an embodiment of the present disclosure, the second port of the second switching device communicates with the gas detection device.

[0011] According to an embodiment of the present disclosure, a second valve is provided between the heating tube and the gas detection device.

[0012] According to an embodiment of the present disclosure, a second three-way joint communicating with each other is provided between the second valve, the second port of the second switching device, and the gas detection device.

[0013] According to an embodiment of the present disclosure, a third valve is provided between the outlet of the heating tube and the suction device.

[0014] According to an embodiment of the present disclosure, a third three-way joint communicating with each other is provided among the outlet of the heating tube, the third valve, and the second valve.

[0015] According to an embodiment of another aspect of the present disclosure, there is provided an analysis system, including: a sampler adapted to heat a sample to be measured adsorbed on a wiping paper into a sample gas in an aerosol state; the sample introduction device according to any one of the above embodiments, wherein a gas path interface of the sampler communicates with a common port of the first switching device; and a gas detection device, and the detection gas from the heating tube flows to the gas detection device.

[0016] According to an embodiment of the present disclosure, the sampler includes: a housing, an accommodation chamber adapted to accommodate a wiping paper is formed inside the housing, and an air path interface and a heating port communicating with the accommodation chamber are provided on the housing; a support member installed at the heating port; and a heat source adapted to heat the wiping paper in the accommodation chamber through the support member.

[0017] According to an embodiment of the present disclosure, the analysis system further includes a positioning device removably installed in the accommodation chamber, and an opening adapted to access the wiping paper and a limiting groove adapted to limit the wiping paper are provided on the positioning device.

[0018] According to an embodiment of the present disclosure, an elastic mechanism is provided between the positioning device and the housing, and the elastic mechanism defines a space for the sample gas to diffuse by biasing the positioning device.

[0019] According to an embodiment of the present disclosure, the support member is made of quartz material.

[0020] According to an embodiment of the present disclosure, a plurality of diversion grooves are provided on a side of the support member in contact with the wiping paper.

[0021] According to an embodiment of another aspect of the present disclosure, a method for detecting a wiping paper is provided, including the following steps: Step S100: Heating the wiping paper adsorbed with a sample to be measured by a sampler so that the sample to be measured generates a sample gas in an aerosol state; Step S200: Using a suction device to suck the sample gas into a heating tube through a first port of a first switching device; Step S300: Further heating the sample gas by the heating tube to generate a detection gas; Step S400: Using a carrier gas flowing from a common port of a second switching device to a first port of the second switching device to blow the detection gas in the heating tube into a gas detection device.

[0022] According to an embodiment of the present disclosure, before performing step S100, the following step S110 is performed: Preheating the wiping paper so that low-boiling components in the sampler with boiling points lower than that of the sample to be measured evaporate; Using a blowing device to blow a cleaning gas through a second port and a common port of the first switching device into the sampler so that the cleaning gas carries the low-boiling components out of the sampler.

[0023] According to an embodiment of the present disclosure, before performing step S110, the following step S105 is performed: Using a blowing device to blow a cleaning gas through a second port and a common port of the first switching device into the sampler to flush the sampler.

[0024] According to an embodiment of the present disclosure, while performing step S105, a carrier gas is passed through the common port and the second port of the second switching device and the heating tube and delivered to the gas detection device.

[0025] According to an embodiment of the present disclosure, after performing step S200, the following step S210 is performed: A cleaning gas is blown through the second port and the common port of the first switching device to the sampler by a blowing device to flush the sampler.

[0026] According to an embodiment of the present disclosure, while performing step S300, the following steps are performed: The carrier gas is delivered to the gas detection device at the common port and the second port of the second switching device, and after performing step S300 and before performing step S400, the following step 310 is performed: The heating tube is connected to the gas detection device so that the detection gas in the heating tube and the carrier gas in the gas detection device reach a pressure balance. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic block diagram of an analysis system showing an exemplary embodiment of the present disclosure;

[0028] Figure 2 A longitudinal sectional view of a sampler showing an exemplary embodiment of the present disclosure;

[0029] Figure 3 Shows Figure 2 A transverse sectional view of the sampler shown;

[0030] Figure 4 A longitudinal sectional view of a sampler showing an exemplary embodiment of the present disclosure;

[0031] Figure 5 A flowchart of an operation of a method for detecting a wiping paper showing an exemplary embodiment of the present disclosure; and

[0032] Figure 6 A further flowchart of an operation of a method for detecting a wiping paper showing an exemplary embodiment of the present disclosure. DETAILED DESCRIPTION

[0033] Hereinafter, the technical solutions in the embodiments of the present disclosure will be clearly and completely described in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way limits the present disclosure or its application or use. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present disclosure without creative efforts belong to the scope of protection of the present disclosure.

[0034] In the following detailed description, for the sake of explanation, numerous specific details are set forth in order to provide a thorough understanding of embodiments of the present disclosure. However, it is obvious that one or more embodiments may be implemented without these specific details. In other instances, well-known structures and devices are illustrated in a schematic manner to simplify the drawings. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said technologies, methods, and devices should be regarded as part of the authorized specification.

[0035] In the description of the present disclosure, it should be understood that the use of terms such as "first" and "second" to define components is merely for the convenience of distinguishing the corresponding components. Without further statement, the above terms have no special meaning, and thus should not be construed as limiting the scope of protection of the present disclosure.

[0036] According to a general inventive concept of the present disclosure, there is provided a sampling device, including: a first switching device adapted to allow a sample gas in an external aerosol state to flow from a common port of the first switching device to a first port of the first switching device; a heating tube adapted to heat the sample gas from the first port of the first switching device into a detection gas; a suction device adapted to suck the sample gas into the heating tube; and a second switching device adapted to allow a carrier gas to flow from a common port of the second switching device to a first port of the second switching device and be delivered to the heating tube to blow the detection gas in the heating tube to a gas detection device.

[0037] According to another general inventive concept of the present disclosure, there is provided an analysis system, including: a sampling device adapted to heat a sample to be measured adsorbed on a wiping paper into a sample gas in an aerosol state; the above-mentioned sampling device, an outlet of the sampler being communicated with a common port of the first switching device; and a gas detection device, the detection gas from the heating tube flowing to the gas detection device.

[0038] According to still another general inventive concept of the present disclosure, there is provided a method for detecting a wiping paper, including the following steps: Step S100: Heating a wiping paper adsorbed with a sample to be measured by a sampler so that the sample to be measured generates a sample gas in an aerosol state; Step S200: Using a suction device to suck the sample gas into a heating tube through a first port of a first switching device; Step S300: Further heating the sample gas by the heating tube to generate a detection gas; Step S400: Using a carrier gas flowing from a common port of a second switching device to a first port of the second switching device to blow the detection gas in the heating tube into a gas detection device.

[0039] According to an embodiment of the present disclosure, there is provided an analysis system suitable for detecting trace amounts of dangerous substances such as drugs and explosives in places such as public security, justice, prisons, customs, border control, anti-smuggling and drug suppression, airports, important government agencies, important security agencies, military bases, consulates, passageways of residences of important persons, and important conference venues.

[0040] Figure 1 The schematic block diagram of the analysis system according to an exemplary embodiment of the present disclosure is shown.

[0041] As Figure 1 shown, according to an embodiment of one aspect of the present disclosure, there is provided an analysis system 1000, including: a sampler 6, a sample injection device 100, and a gas detection device 7. The sampler 6 is adapted to heat the trace sample to be measured adsorbed on the wiping paper into a sample gas in an aerosol state.

[0042] In an exemplary embodiment, referring to Figure 1 , the sample injection device 100 includes a first switching device 1, a heating tube 2, a suction device 3, and a second switching device 4. Each of the first switching device 1 and the second switching device 4 includes a two-position three-way valve, where the common port is only connected to one of the first port and the second port. The first switching device 1 is adapted to allow the external aerosol-state sample gas from the sampler 6 to flow from the common port 11 of the first switching device 1 to the first port 12 of the first switching device 1. The heating tube 2 is adapted to heat the sample gas from the first port 12 of the first switching device 1 into a detection gas. The suction device 3, such as a suction pump, is adapted to suck the sample gas into the heating tube 2. It can be understood that although not shown, the sample injection device further includes a constant temperature heating device matching the heating tube 2 to heat the heating tube. The second switching device 4 is adapted to allow the carrier gas to flow from the common port 41 of the second switching device 4 to the first port 42 of the second switching device 4 and be delivered to the heating tube 2 to blow the detection gas in the heating tube 2 to the gas detection device 7. The gas path interface 612 of the sampler 6 is connected to the common port 41 of the first switching device 1. The detection gas from the heating tube 2 flows to the gas detection device 7.

[0043] In the analysis system 1000 according to an embodiment of the present disclosure, the wiping paper adsorbed with a trace amount of sample to be detected is instantaneously heated in the sampler 6 to generate a sample gas in an aerosol state, and then further heated in the heating tube 2 into a detection gas suitable for being detected by the gas detection device 7, which can reduce the temperature at the opening 641 (to be described in detail below) of the sampler 6 and avoid the danger of scalding the operator.

[0044] According to an exemplary embodiment of the present disclosure, the sampling device 100 further includes a blowing device 5, such as a transfer pump or a pressurized gas source that can provide a cleaning gas. The blowing device 5 is adapted to blow the cleaning gas from the second port 13 of the first switching device 1 to the common port 11 of the first switching device 1. A first valve 51 is provided between the blowing device 5 and the second port 13 of the first switching device 1 to isolate the first switching device 1 from the blowing device 5. During the operation of the blowing device 5, the first valve is opened, and the cleaning gas output by the blowing device 5 can be blown to the sampler 6, thereby flushing the inside of the sampler 6. After the wiping paper is placed in the sampler 6 and after the wiping paper is heated, the inside of the sampler 6 can be cleaned with the cleaning gas conveyed by the blowing device 5 as needed. In one embodiment, when starting to heat the wiping paper, the wiping paper can be heated to a relatively low temperature so that the low-boiling-point substances in the wiping paper and the sampler evaporate, while the high-boiling-point sample to be measured does not evaporate. Then, the sampler 6 is flushed with the blowing device 5 to remove the interference of the low-boiling-point substances, thereby improving the accuracy of the subsequent detection of the sample to be measured.

[0045] In an exemplary embodiment, a first three-way joint 22 that is interconnected is provided between the common port 11 of the first switching device 1, the first port 12 of the first switching device, and the inlet of the heating tube 2. The three ports of the first three-way joint 22 are kept in constant communication.

[0046] In an exemplary embodiment, the second port 43 of the second switching device 4 is in communication with the gas detection device 7. The common port 41 of the second switching device 4 is connected to a carrier gas source 8 to supply the carrier gas required for the operation to the gas detection device 7. For example, during the heating of the sampler 6 and / or the heating tube 2, the carrier gas can be supplied to the gas detection device to maintain the flow of the analysis gas path and reduce the airflow impact.

[0047] In an exemplary embodiment, a second valve 21 is provided between the heating tube 2 and the gas detection device 7 to isolate the gas detection device 7 from its external environment.

[0048] In an exemplary embodiment, a second three-way joint 71 that is interconnected is provided between the second valve 21, the second port 43 of the second switching device 4, and the gas detection device 7. The three ports of the second three-way joint 71 are kept in constant communication.

[0049] In an exemplary embodiment, a third valve 31 is provided between the outlet of the heating tube 2 and the suction device 3. A third three-way joint 23 that is interconnected is provided between the outlet of the heating tube 2, the third valve 31, and the second valve 21.

[0050] Figure 2A longitudinal cross-sectional view of a sampler according to an exemplary embodiment of the present disclosure is shown; Figure 3 Shown Figure 2 A transverse cross-sectional view of the sampler is shown; Figure 4 A longitudinal cross-sectional view of a sampler according to an exemplary embodiment of the present disclosure is shown.

[0051] See also Figures 2-4 In an exemplary embodiment, the sampler 6 includes a shell 61, a support component 62 and a heating source 63. A holding chamber 611 suitable for holding wiping paper is formed in the shell 61, and the shell 61 is provided with an air path interface 612 and a heating port connected to the holding chamber 611. The shell 61 can be made of metal material, and the shell 61 needs to be heated at a low temperature to reduce the adsorption of the internal environment. During manufacturing, it can be but is not limited to being assembled from two upper and lower components using fixings to reduce the difficulty of assembly and manufacturing. The support component 62 is installed at the heating port. The heating source 63 is suitable for heating the wiping paper in the holding chamber through the support component.

[0052] In an exemplary embodiment, the heating source 63 includes a high-power pulse light source that can provide instantaneous heat to volatilize the sample adsorbed on the wiping paper and turn it into an aerosol. The heating source can use but is not limited to a xenon flash lamp or a laser light source, the light emitted by which can pass through the supporting component to reach the surface of the wiping paper where the sample is adsorbed. Furthermore, the heating source can also include a light converging device as needed to concentrate the heat on the detection area. In addition, the light source serving as the heating source can be equipped with a corresponding driving circuit to control the output intensity to prevent the sample to be tested from being decomposed by high temperature. If it is necessary to be compatible with wiping papers with different reflectivity, a reflectivity measuring device such as a continuous light source and a light intensity sensor can also be provided.

[0053] See also Figures 2-4 In an exemplary embodiment, the analysis system 1000 further includes a positioning device 64, which is removably mounted in the receiving chamber 611 to position the wiping paper. The positioning device 64 is provided with an opening 641 for inserting the wiping paper, and a limiting groove 642 for limiting the wiping paper. The positioning device 64 can be made of polytetrafluoroethylene material, or it can be made of metal material to be more heat-resistant. The function of the limiting groove 642 is to ensure that the wiping paper is facing the light path, and it can also limit the space for the diffusion of sample gas in an aerosol state and reduce the cleaning time. A buckle needs to be provided on the outside of the limiting groove or other limiting devices are used to press it in and keep it in the working position.

[0054] In an exemplary embodiment, an elastic mechanism 65, such as a plurality of elastic sheets, is provided between the positioning device 64 and the housing 61. The elastic mechanism 65 defines the space for the diffusion of the sample gas by biasing the positioning device 64. The upper part of the positioning device 64 forms a gradually decreasing inclined profile. The elastic mechanism 65 provides a downward pressure to the suitable limiting groove 642, making the lower part of the limiting groove 642 closely adhere to the surface of the housing 61, forming a limiting space suitable for accommodating the wiping paper, and reducing the processing angle accuracy requirements of the inclined outer surface, and reducing the installation and disassembly resistance.

[0055] In an exemplary embodiment, the support member 62 is made of a transparent heat-resistant material, such as including, but not limited to, quartz material. A plurality of diversion grooves 621 are provided on the side of the heat-conducting material in contact with the wiping paper. The diversion grooves 621 extend along the air flow direction but do not penetrate through the entire thickness of the support member 62. The support member 62 provides a sufficiently high light transmittance, heat resistance, and chemical inertness. The diversion grooves 621 on the upper surface of the support member 62 can ensure that the wiping paper closely adheres outside the diversion grooves during sample loading, ensuring smooth gas flow.

[0056] In an exemplary embodiment, the gas detection device 7 includes an ion mobility spectrometer, which can be, for example, a positive and negative dual-mode ion mobility tube, such as an integrated ceramic dual-mode mobility tube. The ion mobility spectrometer can also be a positive or negative single-mode ion mobility tube. The ion mobility spectrometer has the advantages of being portable, fast, sensitive, and industrializable, and is widely used in measuring the presence and dosage of toxic and harmful gases and / or hazardous chemicals. It may be possible to use a dual mobility tube or a dual mobility tube dual mass analyzer scheme to achieve simultaneous positive and negative mode detection according to actual needs.

[0057] According to an exemplary embodiment of another aspect of the present invention, refer to Figure 1 , a method for detecting a wiping paper is provided, including the following steps: Step S100: Heating the wiping paper adsorbed with the sample to be measured by a sampler 6 to generate a sample gas in an aerosol state; Step S200: Using a suction device 3 to suck the sample gas into a heating tube 2 through a first port 12 of a first switching device 1; Step S300: Further heating the sample gas by the heating tube 2 to generate a detection gas; Step S400: Using a carrier gas flowing from a common port 41 of a second switching device 4 to a first port 42 of the second switching device to blow the detection gas in the heating tube 2 into a gas detection device 7.

[0058] According to the method for detecting a wiping paper according to an embodiment of the present disclosure, the wiping paper adsorbed with a trace amount of sample to be detected is heated in a sampler 6 to generate a sample gas in an aerosol state, and then further heated in a heating tube 2 into a detection gas suitable for being detected by a gas detection device 7, which can reduce the temperature at the opening 641 of the sampler 6 and avoid the danger of scalding the operator.

[0059] In an exemplary embodiment, before performing step S100, the following step S110 is performed: preheating the wiping paper to evaporate the low-boiling components in the sampler that are lower than the boiling point of the sample to be measured; using the blowing device 5 to blow the cleaning gas through the second port 13 and the common port 11 of the first switching device 1 to the sampler 6, so that the cleaning gas carries the low-boiling components out of the sampler 6. For example, according to the method for detecting the wiping paper of the present disclosure embodiment, multi-stage programming injection can be used to heat the wiping paper adsorbed with a trace amount of sample to a lower temperature in the sampler 6, and use the clean air flow from the suction device 3 to back-blow the low-boiling substances in the wiping paper and / or the sampler 6 out of the sampler, complete the interference removal step, and maintain the cleanliness of the injection environment of the sampler.

[0060] In an exemplary embodiment, before performing step S110, the following step S105 is performed: using the blowing device 5 to blow the cleaning gas through the second port 13 and the common port 11 of the first switching device 1 to the sampler 6 to rinse the sampler 6, so that the sampler 6 is in a clean standby state.

[0061] In an exemplary embodiment, while performing step S105, the carrier gas is passed through the common port 41 and the second port 43 of the second switching device 4 and the heating tube 2 to the gas detection device 7. At this time, the carrier gas source 8 supplies the carrier gas to the gas detection device 7 through the common port 41 and the second port 43 of the second switching device 4. In this way, the analysis system 1000 is in a standby state, and the cleaning gas flushing circuit is isolated from the carrier gas holding circuit.

[0062] In an exemplary embodiment, after performing step S200, the following step S210 is performed: using the blowing device 5 to blow the cleaning gas through the second port 13 and the common port 11 of the first switching device 1 to the sampler 6 to rinse the sampler 6.

[0063] In an exemplary embodiment, while performing step S300, the following steps are performed: the carrier gas is delivered to the gas detection device at the common port 41 and the second port 43 of the second switching device 4, and after performing step S300 and before performing step S400, the following step 310 is performed: connecting the heating tube 2 to the gas detection device 7 to make the detection gas in the heating tube 2 and the carrier gas in the gas detection device 7 reach air pressure balance.

[0064] Before performing step S300, the backflush of the blowing device is stopped first, and the heating source 63 outputs pulses of high-intensity light to complete the heating of the surface of the wiping paper within 0.1 second, so that the sample to be measured adsorbed on the wiping paper becomes a sample gas in aerosol state. Then, the suction device 3 is used to quickly suck the sample gas in aerosol state into the heating tube 2 and heat and keep it warm intensively, so that the sample gas in aerosol becomes a gaseous detection gas; then, the carrier gas from the carrier gas source 8 bypasses through the common port 41 and the second port 43 of the second switching device and enters the gas detection device 7, without disturbing the original gas flow direction and flow rate in the gas detection device 7, and performs a pressure balance operation without sample injection to avoid the influence of pressure change on data analysis.

[0065] Next, with reference to Figure 1 and 6 , the method for detecting the wiping paper according to the embodiments of the present disclosure will be described in detail.

[0066] First, a standby step is performed. During this period, the common port 11 and the second port 13 of the first switching device 1 are connected. During this period, the common port 41 and the first port 42 of the second switching device 4 are respectively connected, the first valve 51 and the second valve 21 are turned on, and the third valve 31 is closed; at this time, the carrier gas is transported to the gas detection device 7 through the second switching device 4 and the heating tube 2 to complete the gas path purge of the gas detection device 7, keep the analysis gas path clean, and at the same time, the cleaning gas backflushes into the sampler 6 to keep the sampler clean.

[0067] Then, a sampler anti-interference step is performed. On the basis of the standby step, when the wiping paper adsorbed with the sample to be measured is inserted into the sampler 6, the gas path valve state of the standby step is maintained for a period of time; the heat of the outer shell 61 of the sampler is used to perform low-temperature heating on the wiping paper, so that the gas flow of the clean gas with a certain temperature carries the wiping paper and / or the low-boiling-point interfering components in the sampler out of the sampler.

[0068] After that, perform the thermal sublimation sample loading step. After the sampler interference removal step, switch the second switching device 4 to connect the common port 41 and the second port 43, and close the second valve 21. At this time, turn off the backflush gas flow of the cleaning gas, and isolate the heating tube from the gas detection device 7. After that, start the high-power pulsed light source (heating source 63), switch the first switching device 1 to connect the common port 11 and the second port 13, and at the same time open the third valve 31. At this time, the sample gas in aerosol state is sucked into the heating tube 2 by the suction device 3. The volume of the sucked gas should be slightly smaller than the volume of the gap formed by the outer shell 61 of the sampler 6 and the positioning device 64, and try to avoid inhaling the humid air and interfering substances in the external environment. After the gas suction is completed, switch the first switching device 1 to connect the common port 11 and the first port 12, and open the first valve 51 to purge and clean the sampler 6. After that, close the third valve 31 to enclose the sample gas in aerosol state in the heating tube 2.

[0069] After that, perform the sample evaporation and air pressure balance step. After the sample gas in the heating tube 2 is thermally sublimated into the detection gas, open the second valve 21 and keep it open for a period of time. At this time, the sample gas in aerosol state is heated in the heating tube 2 and evaporates into the gaseous detection gas. After one end of the heating tube 2 is connected to the gas detection device 7, an air pressure impact is generated but no sample is injected into the gas detection device 7, which generates an air pressure buffer for the gas detection device 7 and avoids a large impact on the signal.

[0070] After that, perform the sample injection step. After the evaporation of the sample gas is completed, switch the second switching device 4 to connect the common port 41 and the first port 42. The carrier gas from the carrier gas source 8 pushes the detection gas in the heating tube 2 to the gas detection device 7 for detection, thus completing a sampling analysis cycle.

[0071] In one embodiment, in the case where there is no wiping paper in the sampler 6, the outer shell 61 can be heated to a higher temperature, and the sampler 6 can be backflushed by the blowing device 5 to remove the residual substances in the sampler and achieve in-depth cleaning of the sampler. In another embodiment, in the case of severe contamination of the sampler, the positioning device 64 can be removed from the outer shell 61, the limiting groove 642 of the positioning device 64 can be soaked, cleaned and dried, and at the same time the inside of the outer shell 61 can be wiped and cleaned with an alcohol cotton. After that, the sampler 6 is backflushed and dried by the blowing device 5. After that, a clean positioning device is reinstalled to achieve in-depth cleaning of the sampler. The backflush gas path will completely blow out the unevaporated organic solvents in the sampler, and there will be no interference from low-boiling substances. In addition, the relatively low temperature of the sample injection interface of the sampler enables the use of a detachable sealing component with poor heat resistance at the connection between the common port gas path of the first switching device and the sample injection interface of the sampler, which is convenient for the replacement and maintenance of the entire sample injection interface.

[0072] According to the sample introduction device, analysis system and method for detecting a wiping paper of the embodiments of the present disclosure, the sample to be detected adsorbed on the wiping paper is heated in a sampler to generate a sample gas in an aerosol state, and the sample gas is reheated in a heating tube to generate a gaseous detection gas, and then transferred to a gas detection device for detection and analysis, avoiding the risk of scalding the operator caused by high-temperature heating in the sampler; the sample to be detected is reheated, avoiding the use of a semi-permeable membrane, but maintaining the slow temperature rise and interference removal characteristics of the semi-permeable membrane sampling. Only high-boiling components are analyzed in the gas detection device, reducing the impact of the direct injection gas flow on the gas detection device, and at the same time avoiding the problem of decreased sensitivity of the semi-permeable membrane sampling; in addition, the disassembly and assembly work of the easily contaminated structural parts of the sampler can be simplified, reducing the manufacturing difficulty and providing the possibility of manual accelerated cleaning.

[0073] Those skilled in the art can understand that the above-described embodiments are all exemplary, and those skilled in the art can make improvements thereto. The structures described in various embodiments can be freely combined without conflict in terms of structure or principle.

[0074] Although the present disclosure has been described in conjunction with the accompanying drawings, the embodiments disclosed in the drawings are intended to exemplarily illustrate the preferred embodiments of the present disclosure and should not be construed as a limitation of the present disclosure. Although some embodiments of the inventive concept of the present disclosure have been shown and described, those of ordinary skill in the art will understand that changes can be made to these embodiments without departing from the principles and spirit of the overall inventive concept of the present disclosure. The scope of the present disclosure is defined by the claims and their equivalents.

Claims

1. An injection device, comprising: A first switching device adapted to allow a sample gas in an external aerosol state to flow from a common port of the first switching device to a first port of the first switching device; A heating tube adapted to heat the sample gas from the first port of the first switching device into a detection gas; A suction device adapted to suck the sample gas into the heating tube; And A second switching device adapted to allow a carrier gas to flow from a common port of the second switching device to a first port of the second switching device and be delivered to the heating tube to blow the detection gas in the heating tube to a gas detection device, and a second port of the second switching device is in communication with the gas detection device.

2. The injection device according to claim 1, further comprising a blowing device adapted to blow a cleaning gas from a second port of the first switching device to the common port of the first switching device.

3. The sample introduction device according to claim 2, wherein A first valve is provided between the blowing device and the second port of the first switching device.

4. The sample introduction device according to any one of claims 1-3, wherein, A first three-way joint communicating with each other is provided between the first port of the first switching device, the first port of the second switching device and the inlet of the heating tube.

5. The sample introduction device according to claim 1, wherein, A second valve is provided between the heating tube and the gas detection device.

6. The sample introduction device according to claim 5, wherein, A second three-way joint communicating with each other is provided between the second valve, the second port of the second switching device and the gas detection device.

7. The sample introduction device according to claim 5, wherein, A third valve is provided between the outlet of the heating tube and the suction device.

8. The sample introduction device according to claim 7, wherein A third three-way joint communicating with each other is provided between the outlet of the heating tube, the third valve and the second valve.

9. An analysis system, comprising: A sampler adapted to heat a sample to be measured adsorbed on a wiping paper into a sample gas in an aerosol state; The injection device according to any one of claims 1-8, and a gas path interface of the sampler is in communication with the common port of the first switching device; and A gas detection device, and the detection gas from the heating tube flows to the gas detection device.

10. The analysis system according to claim 9, wherein, The sampler includes: A housing, an accommodation chamber adapted to accommodate a wiping paper is formed inside the housing, and a gas path interface and a heating port communicating with the accommodation chamber are provided on the housing; A support member installed at the heating port; and A heating source adapted to heat the wiping paper in the accommodation chamber through the support member.

11. The analysis system according to claim 10, further comprising a positioning device removably installed in the accommodation chamber, and an opening adapted to access the wiping paper and a limiting groove adapted to limit the wiping paper are provided on the positioning device.

12. The analysis system according to claim 11, wherein, An elastic mechanism is provided between the positioning device and the housing, and the elastic mechanism defines a space for the diffusion of the sample gas by biasing the positioning device.

13. The analysis system according to any one of claims 10-12, wherein, The support member is made of quartz material.

14. The analysis system according to any one of claims 10 - 12, wherein, A plurality of diversion grooves are provided on a side of the support member in contact with the wiping paper.

15. A method for detecting a wiping paper, comprising the following steps: Step S100: Using a sampler to heat a wiping paper adsorbed with a sample to be measured, so that the sample to be measured generates a sample gas in an aerosol state; Step S200: Use a suction device to suck the sample gas into the heating tube through the first port of the first switching device; Step S300: Use the heating tube to further heat the sample gas to generate a detection gas, and at the same time, make the carrier gas be transported to the gas detection device through the common port and the second port of the second switching device; Step S400: Use the carrier gas flowing from the common port of the second switching device to the first port of the second switching device to blow the detection gas in the heating tube into the gas detection device.

16. The method according to claim 15, wherein, Before performing step S100, perform the following step S110: Preheat the wiping paper to evaporate the low-boiling components in the sampler that are lower than the boiling point of the sample to be measured; Use a blowing device to blow the cleaning gas through the second port and the common port of the first switching device to the sampler, so that the cleaning gas carries the low-boiling components out of the sampler.

17. The method according to claim 15, wherein Before performing step S110, perform the following step S105: Use a blowing device to blow the cleaning gas through the second port and the common port of the first switching device to the sampler to rinse the sampler.

18. The method according to claim 17, wherein, While performing step S105, make the carrier gas pass through the common port and the second port of the second switching device, and the heating tube and be transported to the gas detection device.

19. The method according to any one of claims 15 - 17, wherein, After performing step S200, perform the following step S210: Use a blowing device to blow the cleaning gas through the second port and the common port of the first switching device to the sampler to rinse the sampler.

20. The method according to any one of claims 15 - 17, wherein After performing step S300 and before performing step S400, perform the following step 310: Connect the heating tube to the gas detection device so that the detection gas in the heating tube and the carrier gas in the gas detection device reach pressure equilibrium.

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