Trace gas detection system and method based on sample introduction and cleaning

Abstract

The invention provides a trace gas detection system and method based on sample introduction and cleaning, and relates to the field of gas concentration detection. In the system, a control unit is used for converting a flow measurement mode into a sealed measurement mode and performing cleaning control after measurement when the concentration of a first sample is smaller than the lower limit of a preset gas concentration threshold value, and a sample introduction module is connected with a sample introduction valve group so as to transmit sample introduction gas to a main sample introduction pipeline; the first end of the first valve is connected with the main sample introduction pipeline, and the second end of the first valve is respectively connected with the carrier gas module and the first branch valve group; the first branch valve group is connected with the carrier gas module; the trace sensor, the auxiliary sensor and the environment measurement sensor are respectively connected between the first branch valve group and the second branch valve group; the second branch valve set is connected with the first pump and the second pump, the first pump is connected with the exhaust component, and the second pump is connected with the exhaust component through the air outlet valve set.

Description

Technical Field

[0001] This application relates to the field of gas concentration detection technology, specifically to a trace gas detection system and method based on sample introduction and cleaning. Background Technology

[0002] Trace gases refer to trace gas components in the atmosphere with concentrations below one part per million. Despite their minuscule amounts, they play a crucial role in atmospheric chemical cycles, climate change research, and environmental pollution assessment. Related technologies for trace gas concentration detection typically support only one measurement mode: continuous flow measurement or quantitative closed-loop measurement. In continuous flow measurement mode, for low-concentration, high-precision detection scenarios, the short residence time of the gas in the sensor makes it difficult to guarantee measurement accuracy. While closed-loop measurement mode can improve measurement accuracy, its response speed is slow. These single measurement modes struggle to find a proper balance between accuracy and response speed. Furthermore, post-measurement cleaning typically employs a timed or quantitative single-pump sample gas flushing scheme, which has low cleaning power and fails to achieve ideal cleaning results. Summary of the Invention

[0003] This application provides a trace gas detection system and method based on sample introduction and cleaning, which can achieve a balance between measurement accuracy and response speed, and achieve comprehensive cleaning to improve cleaning effectiveness.

[0004] The technical solution of this application embodiment is as follows: In a first aspect, embodiments of this application provide a trace gas detection system based on sample introduction and cleaning. The system includes: a control unit, a sample introduction valve group, a first branch valve group, a second branch valve group, an outlet valve group, a first valve, a second valve, a main sample introduction pipeline, a first pump, a second pump, a trace sensor, an auxiliary sensor, an environmental measurement sensor, a carrier gas module, and multiple exhaust components. The control unit is used to acquire the first sample concentration detected by the trace sensor, and when the first sample concentration is less than a preset lower limit of the gas concentration threshold, control the first pump and the second pump to convert the preset flow measurement mode to a sealed measurement mode. The control unit is also used to perform cleaning control according to a preset cleaning path. The injection module is connected to the injection valve group, which is used to transmit the injection gas output by the injection module to the main injection pipeline. The second valve is connected to the main injection pipeline and the second branch valve group, and the second valve is used to control the direction of the cleaning path. The first end of the first valve is connected to the main injection pipeline, and the second end of the first valve is connected to the carrier gas module and the first branch valve group respectively. The first valve is used to transfer the injection gas of the main injection pipeline to the first branch valve group, or to control the cleaning of the main injection pipeline. The first branch valve group is connected to the carrier gas module, the first end of the trace sensor, the first end of the auxiliary sensor and the first end of the environmental measurement sensor respectively. The second end of the trace sensor, the second end of the auxiliary sensor and the second end of the environmental measurement sensor are connected to the second branch valve group. The first branch valve group is used to transmit the injection gas or the cleaning gas output by the carrier gas module. The second branch valve group is connected to the first end of the first pump and the first end of the second pump respectively. The first pump and the second pump are both used to control the entry of the sample gas or the cleaning gas, and to control the gas path to be emptied. The second end of the first pump is connected to the exhaust component, and the second end of the second pump is connected to the outlet valve group. The outlet valve group is correspondingly connected to the exhaust component, and the exhaust component is used to discharge the sample gas or the cleaning gas.

[0005] In the above technical solution, the trace gas detection system based on sample introduction and cleaning includes a control unit, a sample introduction valve group, a first branch valve group, a second branch valve group, an outlet valve group, a first valve, a second valve, a first pump, a second pump, a trace sensor, an auxiliary sensor, an environmental measurement sensor, a carrier gas module, and multiple exhaust components. These components constitute the measurement path and the cleaning path. The control unit is used to obtain the first sample concentration detected by the trace sensor, and when the first sample concentration is less than a preset lower limit of the gas concentration threshold, it controls the first and second pumps to switch the preset flow measurement mode to a sealed measurement mode. The control unit is also used to control the cleaning according to a preset cleaning path, converting the flow measurement mode to a sealed measurement mode, breaking the single measurement mode and enabling gas detection to adapt to scenarios requiring high accuracy and response speed. The sample injection module is connected to the sample injection valve group, which is used to transmit the sample gas output by the sample injection module to the main sample injection line for subsequent gas concentration measurement by the sensor. The first end of the first valve is connected to the main sample injection line, and the second end of the first valve is connected to the carrier gas module and the first branch valve group respectively. The first valve is used to transmit the sample gas from the main sample injection line to the first branch valve group, or to control the main sample injection line. The cleaning process is controlled by a first valve that directs the gas flow for measurement and cleaning. A second valve connects the main injection line and the second branch valve group, controlling the direction of the cleaning path. The first branch valve group connects to the carrier gas module, the first end of the trace sensor, the first end of the auxiliary sensor, and the first end of the environmental measurement sensor. The second ends of the trace sensor, the auxiliary sensor, and the environmental measurement sensor are connected to the second branch valve group. The first branch valve group is used to transmit either the injection gas or the cleaning gas output from the carrier gas module for comprehensive cleaning of the pipeline. This is achieved by using multiple sensors. This system employs multiple pumps to avoid the inaccuracies of single-sensor measurements. A second branch valve group connects to the first and second pumps respectively. Both pumps control the entry of sample gas or purge gas, and control gas venting. The second end of the first pump connects to the exhaust component, and the second end of the second pump connects to the outlet valve group, which in turn connects to the exhaust component. The exhaust component discharges the sample gas or purge gas. By using multiple pumps, not only can the flow measurement mode and sealed measurement mode be adjusted, but comprehensive cleaning can also be achieved, avoiding the incomplete cleaning caused by a single pump and improving cleaning effectiveness. This system structure allows for conversion from flow measurement mode to sealed measurement mode, avoiding the accuracy and response speed issues inherent in single-mode measurements. It improves the accuracy of gas concentration measurements, ensures response speed, and achieves comprehensive cleaning, enhancing cleaning effectiveness.

[0006] Secondly, embodiments of this application provide a trace gas detection method based on sample introduction and cleaning, applicable to any trace gas detection system based on sample introduction and cleaning as described in the first aspect, the method comprising: Acquire the injection gas, the first sample concentration detected by the trace sensor, the second sample concentration detected by the auxiliary sensor, the environmental data detected by the environmental measurement sensor, and the preset flow measurement mode; In the flow measurement mode, the injection gas is controlled to be introduced; If the concentration of the first sample is less than the preset lower limit of the gas concentration threshold, the flow measurement mode is switched to the sealed measurement mode. The concentration of the first sample is compensated using the environmental data and the concentration of the second sample to obtain the concentration of the detected sample. In the sealed measurement mode, after the concentration of the sample is obtained, the carrier gas module is controlled to output cleaning gas. According to the preset cleaning path, the cleaning gas is used to clean the sample inlet valve group, the first branch valve group, the second branch valve group, the outlet valve group, the first valve, the second valve, the first pump, the second pump, the trace sensor, the auxiliary sensor, the environmental measurement sensor, and multiple exhaust components. After cleaning is completed, the next sample inlet gas is obtained for sample concentration detection.

[0007] In summary, one or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages: 1. Due to the use of a sample injection module connected to a sample injection valve group, the sample injection valve group is used to transmit the sample gas output from the sample injection module to the main sample injection line for subsequent gas concentration measurement by the sensor. The first end of the first valve is connected to the main sample injection line, and the second end of the first valve is connected to the carrier gas module and the first branch valve group respectively. The first valve is used to transmit the sample gas from the main sample injection line to the first branch valve group, or to control the cleaning of the main sample injection line. The first valve controls the gas transmission direction for measurement and cleaning. The second valve connects the main sample injection line and the second branch valve group, and the second valve is used to control the direction of the cleaning path. The first branch valve group is connected to the carrier gas module, the first end of the trace sensor, the first end of the auxiliary sensor, and the first end of the environmental measurement sensor respectively. The second end of the trace sensor and the second end of the auxiliary sensor are connected to the carrier gas module, the first end of the trace sensor, and the first end of the auxiliary sensor. The second end of the two-terminal environmental measurement sensor is connected to the second branch valve group. The first branch valve group is used to transmit the sample gas or the cleaning gas output from the carrier gas module to thoroughly clean the pipeline. By setting multiple sensors, the inaccuracy problem of a single sensor is avoided. The second branch valve group is connected to the first end of the first pump and the first end of the second pump respectively. Both the first and second pumps are used to control the entry of sample gas or cleaning gas, and to control the evacuation of the gas path. The second end of the first pump is connected to the exhaust component, and the second end of the second pump is connected to the outlet valve group, which is correspondingly connected to the exhaust component. The exhaust component is used to discharge the sample gas or cleaning gas. By setting multiple pumps, not only can the flow measurement mode and the sealed measurement mode be adjusted, but also comprehensive cleaning can be achieved, avoiding the problem of incomplete cleaning by a single pump and improving the cleaning intensity. Through the above system structure, the flow measurement mode can be converted to the sealed measurement mode, avoiding the accuracy and response speed problems of single-mode measurement, improving the accuracy of gas concentration measurement, ensuring response speed, and achieving comprehensive cleaning, thus improving the cleaning intensity. Therefore, it effectively solves the problem of difficulty in balancing accuracy and response speed, and incomplete cleaning in related technologies.

[0008] 2. By setting up a sample gas filtration module to filter out large particles and water mist, the accuracy of detection can be further improved.

[0009] 3. By collecting gas concentration data in real time through various sensors, the injection flow rate and measurement mode can be dynamically adjusted to improve measurement accuracy and response speed.

[0010] 4. The main inlet pipeline, sample gas filter module, and nodes are cleaned through a preset cleaning path, and the cleaning process is switched to achieve comprehensive cleaning and dead space cleaning to prevent gas residue. Attached Figure Description

[0011] Figure 1This is a schematic diagram of the structure of a trace gas detection system based on sample introduction and cleaning provided in one embodiment of this application; Figure 2 This is a schematic flowchart of a trace gas detection method based on sample introduction and cleaning provided in one embodiment of this application; Figures 3(a), 3(b), and 3(c) are schematic diagrams illustrating the process of converting a trace gas detection method based on injection and cleaning to a sealed measurement mode according to an embodiment of this application. Figure 4 This is a schematic diagram of the sensor cleaning path of a trace gas detection method based on sample introduction and cleaning provided in one embodiment of this application; Figure 5 This is a schematic diagram of the forward cleaning path of a trace gas detection method based on sample introduction and cleaning provided in one embodiment of this application; Figure 6 This is a schematic diagram of the reverse cleaning path of a trace gas detection method based on sample introduction and cleaning provided in one embodiment of this application; Figure 7 This is a schematic diagram of the sample gas collection bag cleaning path of a trace gas detection method based on sample introduction and cleaning provided in one embodiment of this application; Figure 8 This is an overall schematic diagram of the flow measurement mode of a trace gas detection method based on injection and cleaning provided in one embodiment of this application; Figure 9 This is an overall schematic diagram of the sealed measurement mode of a trace gas detection method based on sample introduction and cleaning provided in one embodiment of this application; Figure 10 This is a schematic diagram of the structure of an electronic device provided in one embodiment of this application. Detailed Implementation

[0012] To enable those skilled in the art to better understand the technical solutions in this specification, the technical solutions in the embodiments of this specification will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0013] In related technologies, the issue of dead space residue remains during the cleaning of detection systems. In traditional gas detection systems, structural dead spaces often exist at pipe connections, branch channels, and before and after sensors. Residual gas is difficult to quickly displace after sample gas switching, easily causing cross-interference. When switching to a different sample gas, traditional systems typically employ a timed or quantitative carrier gas flushing strategy to clean the sample inlet path to reduce the influence of residual gas. However, a fixed cleaning strategy cannot be dynamically adjusted according to sample gas concentration and path structure. If cleaning is insufficient, previous sample gas may still remain in the dead space, affecting the current detection results, especially for trace gas detection and analysis; while over-cleaning may affect detection efficiency. Furthermore, traditional systems usually only use a single pump or unidirectional path cleaning method, lacking a reverse flushing mechanism, making it difficult to effectively remove gas from the dead space area and affecting detection consistency.

[0014] Based on this, embodiments of this application provide a trace gas detection system and method based on sample introduction and cleaning. This trace gas detection system includes a control unit, an inlet valve group, a first branch valve group, a second branch valve group, an outlet valve group, a first valve, a second valve, a first pump, a second pump, a trace sensor, an auxiliary sensor, an environmental measurement sensor, a carrier gas module, and multiple exhaust components. These components constitute a measurement path and a cleaning path. The control unit is used to acquire the first sample concentration detected by the trace sensor, and when the first sample concentration is less than a preset lower limit of the gas concentration threshold, it controls the first and second pumps to remove the pre-exhaust gas. The flow measurement mode is switched to a sealed measurement mode. The control unit is also used to perform cleaning control according to a preset cleaning path. This conversion from flow measurement mode to sealed measurement mode breaks the single measurement mode and can adapt to gas detection scenarios with varying accuracy and response speed. The injection module is connected to the injection valve group, which is used to transfer the injection gas output by the injection module to the main injection pipeline for subsequent gas concentration measurement by the sensor. The first end of the first valve is connected to the main injection pipeline, and the second end of the first valve is connected to the carrier gas module and the first branch valve group respectively. The first valve is used to transfer the injection gas from the main injection pipeline to the first branch valve. The first branch valve group, or a group of valves used to control the cleaning of the main injection pipeline, controls the gas transmission direction through a first valve for measurement and cleaning. A second valve connects the main injection pipeline and the second branch valve group, controlling the direction of the cleaning path. The first branch valve group is connected to the carrier gas module, the first end of the trace sensor, the first end of the auxiliary sensor, and the first end of the environmental measurement sensor, respectively. The second ends of the trace sensor, the auxiliary sensor, and the environmental measurement sensor are connected to the second branch valve group. The first branch valve group is used to transmit the injection gas or the cleaning gas output from the carrier gas module for comprehensive cleaning of the pipeline. By using multiple sensors, the inaccuracy issues associated with single-sensor measurements are avoided. The second branch valve group is connected to the first ends of both the first and second pumps. Both pumps control the entry of sample gas or purge gas, and control gas path evacuation. The second end of the first pump is connected to the exhaust component, and the second end of the second pump is connected to the outlet valve group, which in turn connects to the exhaust component. The exhaust component discharges the sample gas or purge gas. By using multiple pumps, not only can the flow measurement mode and sealed measurement mode be adjusted, but comprehensive cleaning can also be achieved, avoiding the incomplete cleaning problem of a single pump and improving cleaning effectiveness. Through this system structure, the flow measurement mode can be switched to a sealed measurement mode, avoiding the accuracy and response speed issues of single-mode measurement, improving the accuracy of gas concentration measurement, ensuring response speed, and achieving comprehensive cleaning with enhanced cleaning effectiveness.

[0015] It should be noted that this trace gas detection system based on sample introduction and cleaning is widely applicable to fields such as medical diagnosis, environmental monitoring, and safety protection, and has significant application value, especially in application scenarios that require high precision and high reliability.

[0016] The technical solutions provided in the embodiments of this application will be further described below with reference to the accompanying drawings.

[0017] Reference Figure 1 , Figure 1 This is a schematic diagram of the structure of a trace gas detection system based on sample introduction and cleaning provided in this application embodiment. The system includes a control unit, a sample introduction valve group, a first branch valve group, a second branch valve group, an outlet valve group, a first valve f1, a second valve f2, a first pump, a second pump, a trace sensor, an auxiliary sensor, an environmental measurement sensor, a carrier gas module, and multiple exhaust components. These components form the measurement path and the cleaning path. The control unit acquires the concentration of the first sample detected by the trace sensor. When the concentration of the first sample is less than a preset lower limit of the gas concentration threshold, it controls the first and second pumps to convert the preset flow measurement mode to a sealed measurement mode. The control unit also performs cleaning control according to the preset cleaning path, converting the flow measurement mode to a sealed measurement mode, breaking the single measurement mode and adapting to gas detection scenarios with varying accuracy and response speed requirements. Through this system structure, the control unit coordinates measurements, intelligently controls sample introduction, and performs comprehensive cleaning based on the sensor's detected values. This enables accurate measurement of gas concentration, avoids the accuracy and response speed problems associated with single-mode measurements, and achieves comprehensive cleaning, improving cleaning effectiveness. The system also includes a user interface where users can set either a flow measurement mode or a sealed measurement mode. In flow measurement mode, gas concentration detection allows switching to sealed measurement mode. After sealed measurement, it automatically reverts to flow measurement mode. The sealed measurement mode offers higher accuracy compared to the flow measurement mode. When the user selects sealed measurement mode, it remains in sealed measurement mode, ensuring high accuracy.

[0018] In one embodiment, the sample injection module is connected to an injection valve group, which is used to transmit the sample gas output by the sample injection module to the main injection pipeline, providing a basis for subsequent gas concentration measurement by a sensor. The sample injection module includes multiple sample gas collection bags (A, B...N), and the injection valve group corresponds to the sample injection module with multiple injection valves (1, 2...N), wherein sample gas collection bag A corresponds to injection valve 1, and so on, so that each sample gas collection bag corresponds to one injection valve, thereby forming a multi-channel gas detection path to meet the concentration measurement of multiple sets of analytes. For example, the sample gas collection bags are sample gas collection bags A, B, C, etc., and the injection valves include a first injection valve j1, a second injection valve j2, and a third injection valve j3, etc., with sample gas collection bag A corresponding to the first injection valve j1, sample gas collection bag B corresponding to the second injection valve j2, and sample gas collection bag C corresponding to the third injection valve j3.

[0019] It should be noted that the method of injecting samples by connecting the sample gas collection bag to the valve is an offline measurement type. By setting up the first and second pumps to work together, it is possible to support a mixed online and offline measurement type, which is achieved by removing the sample gas collection bag and controlling it through the injection valve.

[0020] like Figure 1 As shown, the first end of the first valve f1 is connected to the main injection pipeline, and the second end of the first valve f1 is connected to both the carrier gas module and the first branch valve group. Gas from the main injection pipeline is transferred to the first branch valve group via the first valve f1. Cleaning gas generated by the carrier gas module can also be transferred to the main injection pipeline via the first valve f1. The second valve f2 connects the main injection pipeline and the second branch valve group. The second valve f2 controls the direction of the cleaning path to clean the main injection pipeline. The first valve f1 can control not only the flow direction of the injection gas for injection gas detection but also the flow direction of the cleaning gas. The second valve f2 is only used to control the flow direction of the cleaning gas for comprehensive cleaning.

[0021] like Figure 1As shown, the first branch valve group is connected to the carrier gas module, the first end of the trace sensor, the first end of the auxiliary sensor, and the first end of the environmental measurement sensor, respectively. The second ends of the trace sensor, the auxiliary sensor, and the environmental measurement sensor are connected to the second branch valve group. The first and second branch valve groups correspond to each other. The sample gas is transmitted to the first branch valve group, and the valves within the first branch valve group control the valves to transmit the sample gas to the environmental measurement sensor, the trace sensor, and the auxiliary sensor, respectively. The environmental measurement sensor is used to detect environmental information of the sample gas, including pressure, temperature, and humidity. The trace sensor and the auxiliary sensor are used to measure the concentration of the sample gas, so that the control unit can control the measurement mode and cleaning path according to the detected concentration. By setting multiple sensors, the problem of inaccurate measurement by a single sensor is avoided. The cleaning gas output from the carrier gas module is transmitted to the first branch valve group, and the valves within the first branch valve group control the valves to transmit the cleaning gas to the environmental measurement sensor, the trace sensor, and the auxiliary sensor, respectively, to clean the environmental measurement sensor, the trace sensor, and the auxiliary sensor, achieving a more comprehensive cleaning and improving the cleaning effect. Among them, the environmental measurement sensor can be a MEMS sensor, the trace sensor can be a high-precision NDIR (infrared) sensor, a high-precision TDLAS (laser) sensor, a high-precision chemical sensor, etc., and the auxiliary sensor can be an ordinary sensor.

[0022] In one embodiment, the first branch valve group includes a third valve f3, a fourth valve f4, and a fifth valve f5. A first valve f1 is connected to the third valve f3, the fourth valve f4, and the fifth valve f5. The third valve f3 is connected to the first end of an environmental measurement sensor, the fourth valve f4 is connected to the first end of a trace sensor, and the fifth valve f5 is connected to the first end of an auxiliary sensor, thereby transmitting the sample gas to the environmental measurement sensor, the trace sensor, and the auxiliary sensor for concentration measurement. The second end of the environmental measurement sensor, the second end of the trace sensor, and the second end of the auxiliary sensor are connected to the second branch valve group to output the detected sample gas.

[0023] like Figure 1As shown, the carrier gas module is connected to the third valve f3, the fourth valve f4, and the fifth valve f5, respectively. The third valve f3 is connected to the first end of the environmental measurement sensor, the fourth valve f4 is connected to the first end of the trace sensor, and the fifth valve f5 is connected to the first end of the auxiliary sensor. This allows the cleaning gas output from the carrier gas module to be transmitted to the environmental measurement sensor, the trace sensor, and the auxiliary sensor, thereby cleaning these sensors. The second end of the environmental measurement sensor, the second end of the trace sensor, and the second end of the auxiliary sensor are all connected to the second branch valve group to output the cleaned cleaning gas.

[0024] like Figure 1 As shown, a sample gas filtration module is also provided between the first valve f1 and the first branch valve group. The first end of the sample gas filtration module is connected to the second end of the first valve f1, and the second end of the sample gas filtration module is connected to the carrier gas module, the third valve f3, the fourth valve f4, and the fifth valve f5, respectively. During sample gas measurement, the first valve f1 transmits the sample gas to the sample gas filtration module, which filters the sample gas for particulate matter and water mist. The filtered sample gas is then transmitted through the third valve f3 to the environmental measurement sensor, through the fourth valve f4 to the trace sensor, and through the fifth valve f5 to the auxiliary sensor for measurement, which can further improve the accuracy of the measurement results.

[0025] In one embodiment, during the cleaning of the sample gas filtration module, the first pump and the second pump work together to draw in the sample gas. The cleaning module output from the carrier gas module is transmitted to the sample gas filtration module, and then transmitted through the first valve f1, thereby achieving cleaning of the sample gas filtration module, realizing a more comprehensive cleaning and improving the cleaning effect.

[0026] like Figure 1 As shown, the carrier gas module includes a carrier gas MEMS sensor and a ninth valve f9. The first end of the carrier gas MEMS sensor is connected to the carrier gas unit, and the second end is connected to the ninth valve f9. The carrier gas unit generates cleaning gas, and the carrier gas MEMS sensor monitors the baseline state of the cleaning gas to ensure the stability of the cleaning gas output from the carrier gas unit. The ninth valve f9 is connected to the sample gas filtration module, the third valve f3, the fourth valve f4, and the fifth valve f5, respectively. The ninth valve f9 controls the flow direction of the cleaning gas. For example, during cleaning, the ninth valve f9 can control the flow of the cleaning gas to the third valve f3, the fourth valve f4, and the fifth valve f5 to clean the environmental measurement sensor, trace sensor, and auxiliary sensor. It can also control the flow of the cleaning gas to the sample gas filtration module to clean the sample gas filtration module.

[0027] In one embodiment, the second branch valve group is connected to the first end of the first pump and the first end of the second pump, respectively. Both the first and second pumps are used to control the entry of sample gas or cleaning gas, and to control the evacuation of the gas path. The second end of the first pump is connected to the exhaust component, and the second end of the second pump is connected to the outlet valve group. The outlet valve group is correspondingly connected to the exhaust component, which is used to discharge the sample gas or cleaning gas. By setting multiple pumps, not only can the gas measurement mode be adjusted, but comprehensive cleaning can also be achieved, avoiding the problem of incomplete cleaning by a single pump and improving the cleaning effect. The exhaust component is an exhaust port, but it can also be other components capable of venting gas, which will not be elaborated here.

[0028] like Figure 1 As shown, the gas outlet valve group includes a first gas outlet valve c1, a second gas outlet valve c2, and a third gas outlet valve c3. The second end of the first pump is connected to one of the multiple exhaust components, which is the first gas outlet port 01, through which gas is discharged. The second pump is connected to both the second and third gas outlet valves. The third gas outlet valve is connected to an exhaust component, which is the second gas outlet port 02, through which gas discharge is controlled. The gas is transported to the main injection pipeline through the second gas outlet valve, and then to the first gas outlet valve after passing through the main injection pipeline. The first gas outlet valve is connected to an exhaust component, which is the third gas outlet port 03, through which gas is discharged.

[0029] It should be noted that during sample injection, the first and second pumps can be used in synergistic aspiration, or in parallel aspiration. Alternatively, one or both pumps can be used as vacuum pumps to evacuate the air from the system, and then the sample gas can be introduced using the air pressure difference to achieve pressure balance. By setting up a first and second pump, and using multiple pumps, various injection modes can be provided, avoiding the limited injection modes offered by a single pump. Furthermore, the first and second pumps can be used for aspiration to introduce gas generated by the carrier gas unit, enabling multiple cleaning modes and increasing the cleaning intensity to achieve the desired cleaning effect. The specific aspiration process for introducing cleaning gas is similar to the sample injection process described above and will not be elaborated upon here.

[0030] It should also be noted that in the flow measurement mode, when the concentration of the first sample is less than the preset lower limit of the gas concentration threshold, the dual pumps work together to switch from the flow measurement mode to the sealed measurement mode. Specifically, in the early stage of sample introduction in the flow measurement mode, the first and second pumps work together to introduce the sample, that is, the first and second pumps are used to draw in the sample in parallel or alternately to achieve gas displacement. In the middle stage of sample introduction in the flow measurement mode, the first or second pump is turned off, and the sample is introduced by drawing in the sample at a constant rate using the first or second pump. In the later stage of sample introduction in the flow measurement mode, the second and first pumps are turned off to keep the internal and external pressure constant, thereby switching from the flow measurement mode to the sealed measurement mode for sealed measurement. By detecting the gas concentration in real time, the mode switching is achieved automatically, thus avoiding the problem that using only a single measurement mode cannot balance accuracy and response speed. This enables accurate detection and allows for flexible switching to adapt to different application scenarios.

[0031] like Figure 1 As shown, the second branch valve group includes a sixth valve f6, a seventh valve f7, and an eighth valve f8. The second end of the environmental measurement sensor is connected to the sixth valve f6, which is connected to both the first and second pumps. The second end of the trace sensor is connected to the seventh valve f7, which is connected to both the first and second pumps. The second end of the auxiliary sensor is connected to the eighth valve f8, which is connected to both the first and second pumps. The second branch valve group corresponds to the first branch valve group, allowing for the installation of multiple sensors, including the environmental measurement sensor, the trace sensor, and the auxiliary sensor. The environmental measurement sensor is controlled by the third valve f3 and the sixth valve f6, the trace sensor by the fourth valve f4 and the seventh valve f7, and the auxiliary sensor by the fifth valve f5 and the eighth valve f8, enabling the activation and deactivation of multiple sensors. By using multiple sensors, the problem of a single sensor being unable to distinguish multiple groups of gas components, which can easily cause cross-interference, is avoided, thus improving the accuracy of detection.

[0032] The above system structure enables accurate gas detection and thorough cleaning after detection to facilitate the next gas measurement and prevent gas mixing. Two examples are given below to illustrate the sample introduction and detection process and the cleaning process, respectively.

[0033] Example 1: Measurement Mode Switching The aforementioned trace gas detection system based on sample introduction and cleaning, when set to flow measurement mode, can switch measurement modes according to the concentration of the gas being detected, adapting to changes in concentration and improving detection accuracy. Specifically, the user first sets the flow measurement mode, using either a first or second pump for coordinated sample introduction. During measurement, a trace sensor performs real-time detection. If the concentration of the first sample is lower than the preset lower limit of the gas concentration threshold, the flow measurement mode, with its short residence time, is inaccurate for low-concentration gases, and the system is switched to a sealed measurement mode. The conversion process is achieved gradually through the pre-injection, mid-injection, and post-injection stages of the flow measurement mode. In the pre-injection stage, the first and second pumps work together, using parallel or alternating suction to achieve gas displacement. In the mid-injection stage, either the first or second pump is shut off, and suction continues at a constant rate using either pump. In the post-injection stage, both the first and second pumps are shut off, maintaining constant internal and external pressure, thus converting the flow measurement mode to a sealed measurement mode for sealed measurement. After the gas measurement is complete, the flow measurement mode is automatically restored. Real-time gas concentration monitoring enables automatic mode switching, avoiding the limitations of using a single measurement mode in balancing accuracy and response speed. This allows for accurate detection and flexible switching to adapt to different application scenarios.

[0034] Example 2: Sample Injection Detection Since the sample inlet valve group includes multiple valves corresponding to the sample gas collection bags, the gas detection in one of the sample gas collection bags (A) will be explained as an example. First, the sample is injected through coordinated suction using either the first or second pump. The valve corresponding to the sample gas collection bag A is opened, transferring the gas to the main inlet pipeline. The first valve f1 is opened, allowing the gas in the main inlet pipeline to flow through the first valve f1 to the sample gas filtration module for large particle and water mist filtration. Then, the valves in the first branch valve group are opened, allowing the gas to flow through the environmental measurement sensor, trace sensor, and auxiliary sensor for gas concentration detection. The gas then flows through the second branch valve group to either the first or second pump. When the gas flows to the first pump, it is discharged through the first outlet port 01. When the gas flows to the second pump, the valve in the sample outlet valve group is opened, allowing the gas to exit through the second outlet port 02. Real-time gas concentration detection using multiple sensors not only allows for the measurement of multiple sets of test gases but also improves detection accuracy.

[0035] It should be noted that during sample injection detection, the injection process is intelligently controlled based on the concentration of the first sample detected by the trace sensor. In flow measurement mode, when the concentration of the first sample is less than or equal to the preset upper limit of the gas concentration threshold, the opening of the third valve f3, the fourth valve f4, and the fifth valve f5 is reduced, decreasing the suction speed of the first pump or the second pump. This slows down the gas injection and extends the measurement time. In flow measurement mode, when the concentration of the first sample is greater than the preset upper limit of the gas concentration threshold, the opening of the third valve f3, the fourth valve f4, and the fifth valve f5 is increased, increasing the suction speed of the first pump or the second pump. This speeds up the gas injection and shortens the measurement time. By controlling the injection flow rate in this way, the injection speed and measurement time can be automatically adjusted according to the requirements of different gas concentrations, improving detection accuracy.

[0036] It should also be noted that one of the first and second pumps is used as a vacuum pump, and the other as a vacuum suction auxiliary pump. The gas inside the system is extracted to create a vacuum. The pressure difference between the inside and outside allows gas from the sample gas collection bag to enter, enabling sample introduction and detection. Measurements are then taken by environmental sensors, trace sensors, and auxiliary sensors. This mode is a sealed measurement mode, offering high measurement accuracy.

[0037] Example 3: Gas Cleaning After the measurement is completed, the detection system is cleaned to avoid gas interference when measuring the gas in the next sample gas collection bag. Cleaning gas is generated by the carrier gas module to control the opening or closing of the first branch valve group, the first valve f1, and the first and second pumps. This cleans the first and second pumps, the main inlet pipeline, the sample gas filter module, and residual gas in the dead space, respectively. Specific cleaning methods are described in the following instructions.

[0038] refer to Figure 2 , Figure 2 This is a schematic flowchart of a trace gas detection method based on sample introduction and cleaning provided in an embodiment of this application. The trace gas detection method based on sample introduction and cleaning is applied to the above-mentioned trace gas detection system based on sample introduction and cleaning. The trace gas detection method based on sample introduction and cleaning is executed by the processor of the control unit of the trace gas detection system based on sample introduction and cleaning. The trace gas detection method based on sample introduction and cleaning includes steps S100, S200, S300, S400 and S500.

[0039] Step S100: Obtain the injection gas, the first sample concentration detected by the trace sensor, the second sample concentration detected by the auxiliary sensor, the environmental data detected by the environmental measurement sensor, and the preset flow measurement mode.

[0040] In one embodiment, the sample gas is the gas in the sample gas collection bag. By opening the valve corresponding to the sample gas collection bag in the sample gas valve group, the sample gas can be input into the detection system to obtain the sample gas, providing a data basis for subsequent detection of the sample gas. A trace sensor detects the sample gas to obtain a first sample concentration, an auxiliary sensor detects the sample gas concentration to obtain a second sample concentration, and an environmental measurement sensor detects the pressure, temperature, humidity, etc., in the system to obtain environmental data. The data from the trace sensor (first sample concentration), the auxiliary sensor (second sample concentration), and the environmental measurement sensor (environmental data) are transmitted to the control unit for data processing, including intelligent sample injection control, measurement mode switching control, and cleaning path control, thereby achieving accurate measurement and timely response. The preset flow measurement mode is a user-defined measurement mode. The system also includes a user-interactive interface where the user sets the measurement mode, which is transmitted to the control unit via the control bus for subsequent sample injection control and measurement.

[0041] It should be noted that users can set either flow measurement mode or sealed measurement mode. In sealed measurement mode, a vacuum pump is used to purge air from the air path, and negative pressure is used for sample injection. Sealed measurement is performed after the air pressure stabilizes. In flow measurement mode, the measurement can proceed either to flow measurement or switch from flow measurement mode to sealed measurement mode. The system automatically reverts to flow measurement mode after measurement is completed, and intelligent control is applied based on the concentration of the first sample detected.

[0042] Step S200: In flow measurement mode, control the injection of the injection gas.

[0043] Specifically, in flow measurement mode, the injection gas is controlled to ensure that the concentration of the first sample is not less than the preset lower limit of the gas concentration threshold. If the concentration of the first sample is less than the preset lower limit of the gas concentration threshold, it indicates that the trace gas to be measured is in a low concentration range, and the system will switch from flow measurement mode to sealed measurement mode. After the measurement is completed, the system will automatically return to flow measurement mode. It should be noted that the preset lower limit of the gas concentration threshold is the concentration threshold set by the system for measuring trace gases. The concentration threshold includes both the lower limit and the upper limit of the gas concentration threshold.

[0044] In one embodiment, in flow measurement mode, the injection of the sample gas is controlled, including but not limited to: When the flow measurement mode is set, and the concentration of the first sample is greater than or equal to the lower limit of the gas concentration threshold and less than or equal to the upper limit of the preset gas concentration threshold, it indicates that the gas concentration is relatively low. In order to ensure the accuracy of the flow measurement mode, the opening of the third valve f3, the fourth valve f4 and the fifth valve f5 is reduced, so that the gas flow rate is slowed down, the suction speed of the first pump or the second pump is reduced, so as to achieve slow sample injection, expand the sampling window, improve the sensor signal accumulation and signal-to-noise ratio, and extend the measurement time to ensure that the gas residence time is longer, thereby ensuring the accuracy of gas detection.

[0045] In the flow measurement mode, if the concentration of the first sample is greater than the preset upper limit of the gas concentration threshold, it indicates that the gas concentration is relatively high. In order to ensure timely response of gas detection, the opening of the third valve f3, the fourth valve f4 and the fifth valve f5 are increased, so that the gas flow rate is increased, the suction speed of the first pump or the second pump is increased, the sample is injected quickly, the sample gas replacement is accelerated, the sample injection module can accelerate the injection of sample gas, shorten the measurement time and increase the sample throughput.

[0046] In one embodiment, in the flow measurement mode, when the concentration of the first sample being detected is consistently not less than the preset lower limit of the gas concentration threshold, the above-mentioned intelligent sample injection adjustment is maintained to achieve accurate gas detection in the flow measurement mode.

[0047] Step S300: If the concentration of the first sample is less than the preset lower limit of the gas concentration threshold, the flow measurement mode is switched to the sealed measurement mode.

[0048] In one embodiment, if the concentration of the first sample is less than a preset lower limit of the gas concentration threshold, it indicates that the concentration of the first sample is in a low concentration range and requires more precise detection. The flow measurement mode is then switched to a sealed measurement mode, which enables accurate measurement of low-precision gas concentrations. By switching measurement modes, both detection accuracy and response speed can be considered.

[0049] In one embodiment, when the concentration of the first sample is less than a preset lower limit of the gas concentration threshold, the flow measurement mode is switched to a sealed measurement mode, including but not limited to: in the early stage of the flow measurement mode, the first pump and the second pump are used for coordinated injection to achieve gas displacement; in the middle stage of the flow measurement mode, the first pump or the second pump is turned off, and the second pump or the first pump is used for constant flow suction injection; in the later stage of the flow measurement mode, when the concentration of the first sample is less than the preset lower limit of the gas concentration threshold, the second pump and the first pump are turned off to stabilize the pressure and switch to a sealed measurement mode, wherein the early stage of injection, the middle stage of injection, and the later stage of injection are spaced apart by a preset injection time.

[0050] Specifically, when the concentration of the first sample is less than the preset lower limit of the gas concentration threshold, in the early stage of the flow measurement mode, the first and second pumps are turned on to perform coordinated injection, resulting in gas displacement (see Figure 3(a)). After a preset injection time, in the middle stage of the flow measurement mode, the first pump is turned off, and only the second pump is used for constant flow injection, or the second pump is turned off, and only the first pump is used for constant flow injection, so that the internal and external pressures gradually become consistent (see Figure 3(b)). After a preset injection time, in the later stage of the flow measurement mode, the second and first pumps are turned off, so that the internal and external pressures are consistent, and the mode is switched to sealed measurement mode. For details of the sealed measurement mode, please refer to Figure 3(c). The injection time can be 2 seconds, 3 seconds, etc. It should be noted that when the internal and external pressures are consistent, the first valve f1, the valves in the first branch valve group, and the valves in the second branch valve group are closed to perform subsequent sealed measurements.

[0051] Step S400: Use environmental data and the concentration of the second sample to perform data compensation processing on the concentration of the first sample to obtain the concentration of the detected sample.

[0052] In one embodiment, the following steps are taken: acquiring a first sample concentration detected by a trace sensor, a second sample concentration detected by an auxiliary sensor, and environmental data detected by an environmental measurement sensor. The environmental data includes measured pressure, measured temperature, and measured humidity. The first sample concentration is compensated using the environmental data and the second sample concentration. Specifically, the first and second sample concentrations are first weighted and fused to obtain a fused sample concentration. The weight of the first sample concentration is set to be greater than that of the second sample concentration, and the sum of their weights is 1, ensuring that the first sample concentration plays a primary role. Based on the sensor's temperature-dependent relationship, the difference between the measured temperature and the reference temperature is calculated. This difference is multiplied by a temperature coefficient to obtain a temperature compensation coefficient. The reference temperature and temperature coefficient are obtained statistically through multiple experiments, and the temperature coefficient is a value less than 1. Based on the sensor's pressure-dependent relationship, the measured pressure is divided by the reference pressure to obtain a pressure compensation coefficient. The reference pressure is obtained statistically through multiple experiments. Based on the sensor's humidity-dependent relationship, the difference between the measured humidity and the reference humidity is calculated. This difference is multiplied by a humidity coefficient to obtain a humidity compensation coefficient. The reference humidity and humidity coefficient are obtained statistically through multiple experiments, and the humidity coefficient is a value less than 1. Then, the temperature compensation coefficient, pressure compensation coefficient, and humidity compensation coefficient are multiplied together. The result of this multiplication is then multiplied by the fused sample concentration, and finally added back to the fused sample concentration to obtain the detection sample concentration. This compensation process takes into account the impact of environmental factors on the accuracy of the detection concentration, thereby improving the accuracy of the detection. It should be noted that after the measurement is completed, the system automatically switches to flow measurement mode.

[0053] In step S500, under sealed measurement mode, after the concentration of the sample is obtained, the carrier gas module is controlled to output cleaning gas. According to the preset cleaning path, the cleaning gas is used to clean the sample inlet valve group, the first branch valve group, the second branch valve group, the outlet valve group, the first valve f1, the second valve f2, the first pump, the second pump, the trace sensor, the auxiliary sensor, the environmental measurement sensor, and multiple exhaust components. After cleaning is completed, the next sample inlet gas is obtained for sample concentration detection.

[0054] In one embodiment, after measuring the concentration of the sample, a cleaning process is performed. The carrier gas module outputs cleaning gas, and the ninth valve f9 in the carrier gas module is opened, allowing the cleaning gas to flow out. Following a preset cleaning path, the cleaning gas cleans the sample inlet valve group, the first branch valve group, the second branch valve group, the outlet valve group, the first valve f1, the second valve f2, the first pump, the second pump, the trace sensor, the auxiliary sensor, the environmental measurement sensor, and multiple exhaust components. This cleaning of all components prevents gas residue from affecting the accuracy of subsequent gas detections. After cleaning, the next sample gas is obtained, i.e., the next sample gas collection bag and its corresponding valve are opened for sample concentration detection. This system can detect multiple sets of test gases, and after comprehensive cleaning, there are no issues such as gas cross-interference.

[0055] like Figure 4 As shown, the cleaning path includes a sensor cleaning path. The sensor cleaning path involves outputting cleaning gas through the carrier gas module, transmitting the cleaning gas through the sample gas filtration module to the first branch valve group, transmitting it through the third valve f3 to the environmental measurement sensor, and outputting it through the sixth valve f6 in the second branch valve group; transmitting it through the fourth valve f4 to the trace sensor, and outputting it through the seventh valve f7 in the second branch valve group; transmitting it through the fifth valve f5 to the auxiliary sensor, and outputting it through the eighth valve f8 in the second branch valve group. The second branch valve group outputs the first pump and the second pump. The gas output by the first pump is discharged through the first vent 01, and the gas output by the second pump is transmitted through the second vent valve c2 to the first vent valve c1, and then discharged through the third vent 03, thus achieving the cleaning of the sensor module.

[0056] In one embodiment, the cleaning path includes a main injection line cleaning path, which includes a forward cleaning path and a reverse cleaning path.

[0057] like Figure 5As shown, the forward cleaning path is as follows: the cleaning gas is output through the carrier gas module, and the cleaning gas is transmitted to the first valve f1 through the sample gas filter module. The first valve f1 inputs the cleaning gas into the main sample inlet pipeline, and it is transmitted to the first pump and the second pump through the second valve f2. The gas output from the first pump is discharged through the first vent 01, and the gas output from the second pump is discharged through the second vent 02 after passing through the third vent valve c3, thus realizing the cleaning of the main sample inlet pipeline.

[0058] like Figure 6 As shown, the reverse cleaning path is as follows: the cleaning gas is output through the carrier gas module, and then transmitted to the environmental measurement sensor through the third valve f3 in the first branch valve group. The cleaning gas is then transmitted to the second pump through the sixth valve f6 in the second branch valve group. After passing through the second outlet valve c2 and the first outlet valve c1 in the outlet valve group, the gas is discharged through the exhaust component, which is the third outlet port 03, thus realizing the cleaning of the main sample inlet pipeline.

[0059] like Figure 7 As shown, the cleaning path includes a sample gas collection bag cleaning path. The sample gas collection bag cleaning path involves outputting cleaning gas through the carrier gas module, transmitting the cleaning gas to the environmental measurement sensor through the third valve f3 in the first branch valve group, transmitting the cleaning gas to the second pump through the sixth valve f6 in the second branch valve group, and then discharging the gas output from the second pump through the second outlet valve c2 in the outlet valve group and the exhaust port in the sample injection module, thereby achieving the cleaning of the sample gas collection bag.

[0060] In one embodiment, under sealed measurement mode, the cleaning path also includes a vacuum negative pressure cleaning path. All valves in the first branch valve group and the second branch valve group are opened, the second valve f2 is opened, and the third vent valve c3 is opened. The first and second pumps then draw in air to completely expel the gas from the system, achieving vacuum negative pressure cleaning. This cleaning path allows for comprehensive cleaning of the system, avoiding cross-contamination and ensuring the accuracy and reliability of subsequent measurement results.

[0061] In one embodiment, the cleaning path includes a dead space cleaning path. The dead space cleaning path involves the following steps: when the sample gas collection bag is detected as being removed by the sample injection module, cleaning gas is output from the carrier gas module, transmitted to the environmental measurement sensor via the third valve f3 in the first branch valve group, transmitted to the second pump via the sixth valve f6 in the second branch valve group, and then transmitted to the second outlet valve c2 in the outlet valve group. The gas is then transmitted to the sample injection valve group via the second outlet valve c2, and finally discharged through the exhaust component in the sample injection module to clean the module. This exhaust component is the exhaust port in the sample injection module. This cleaning path allows for comprehensive cleaning of the system, avoiding cross-contamination and ensuring the accuracy and reliability of subsequent measurement results.

[0062] In one embodiment, the user can set a flow measurement mode, a sealed measurement mode, or switch between flow measurement mode and sealed measurement mode, and automatically revert to flow measurement mode after the sealed measurement mode is completed. Detailed descriptions will be provided based on these different modes.

[0063] like Figure 8 As shown, the measurement is initiated, and the user has preset it to flow measurement mode. In the early stage of the flow measurement mode, the two pumps (the first pump and the second pump) work together to inject the sample. In the middle stage of the flow measurement mode, a single pump (either the first pump or the second pump) injects the sample at a constant flow. In the later stage of the flow measurement mode, if the concentration of the first sample is less than the preset lower limit of the gas concentration threshold, it switches to closed measurement mode, outputs the detection sample concentration, automatically recovers to flow measurement mode, selects a path, performs gas path cleaning, switches channels, and performs measurement again.

[0064] Specifically, in the later stages of sample introduction in the flow measurement mode, when the concentration of the first sample is greater than or equal to the lower limit of the gas concentration threshold and less than or equal to the upper limit of the preset gas concentration threshold, the aspiration rate is reduced and the measurement time is extended. Conversely, in the later stages of sample introduction in the flow measurement mode, when the concentration of the first sample is greater than the upper limit of the preset gas concentration threshold, the aspiration rate is increased and the measurement time is shortened.

[0065] like Figure 9 As shown, the measurement is initiated, and the user has preset it to sealed measurement mode. Vacuum is purged using the first and second pumps. When the pressure of the environmental measurement sensor is near negative one standard atmosphere, the first and second pumps are turned off. Then, the sample injection valves j1, j2, and j3 are opened to inject the sample using negative pressure. When the environmental measurement sensor detects that the pressure is stable, a sealed measurement is performed, and the sample concentration is output. The path is selected, and the gas path is cleaned to prepare for the next sealed measurement. The channel is then switched to perform the measurement again.

[0066] It should also be noted that the apparatus provided in the above embodiments is only illustrated by the division of the above functional modules. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above. In addition, the apparatus and method embodiments provided in the above embodiments belong to the same concept, and their specific implementation process can be found in the method embodiments, which will not be repeated here.

[0067] This application also discloses an electronic device. (See reference...) Figure 10 , Figure 10 This is a schematic diagram of the structure of an electronic device according to an embodiment of this application. The electronic device 500 may include: at least one processor 501, at least one control module 504, user interface 503, memory 505, at least one communication bus 502, and sampling module 506.

[0068] The communication bus 502 is used to enable communication between these components.

[0069] The user interface 503 may include a display screen and buttons, and optionally, the user interface 503 may also include a standard wired interface or a wireless interface.

[0070] The processor 501 may include one or more processing cores. The processor 501 connects to various parts of the system using various interfaces and lines, and performs various system functions and processes data by running or executing instructions, programs, code sets, or instruction sets stored in memory 505, and by calling data stored in memory 505. Optionally, the processor 501 may be implemented using at least one hardware form of Digital Signal Processing (DSP), Field-Programmable Gate Array (FPGA), or Microcontroller Unit (MCU). The processor 501 may integrate one or a combination of several of the following: Central Processing Unit (CPU), Graphics Processing Unit (GPU), and modem. The CPU primarily handles the operating system, user interface, and applications; the GPU is responsible for rendering and drawing the content required for display; and the modem handles wireless communication. It is understood that the modem may also not be integrated into the processor 501 and may be implemented as a separate chip.

[0071] The memory 505 may include random access memory (RAM) or read-only memory. Optionally, the memory 505 may include a non-transitory computer-readable storage medium. The memory 505 may be used to store instructions, programs, code, code sets, or instruction sets. The memory 505 may include a program storage area and a data storage area, wherein the program storage area may store instructions for implementing an operating system, instructions for at least one function (such as touch function, sound playback function, image playback function, etc.), instructions for implementing the above-described method embodiments, etc.; the data storage area may store data involved in the above-described method embodiments, etc. Optionally, the memory 505 may also be at least one storage device located remotely from the aforementioned processor 501. (Refer to...) Figure 10 The memory 505, which serves as a computer storage medium, may include an operating system, a network communication module, a user interface module, and an application program for a trace gas detection method based on sample introduction and cleaning.

[0072] exist Figure 10 In the illustrated electronic device 500, the user interface 503 is mainly used to provide an input interface for the user and acquire user input data; while the processor 501 can be used to call an application program stored in the memory 505 for a trace gas detection method based on sample introduction and cleaning. When executed by one or more processors 501, the electronic device 500 performs one or more methods as described in the above embodiments. It should be noted that, for the foregoing method embodiments, for the sake of simplicity, they are all described as a series of actions. However, those skilled in the art should understand that this application is not limited to the described order of actions, because according to this application, some steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also understand that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily essential to this application.

[0073] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0074] In the various embodiments provided in this application, it should be understood that the disclosed apparatus can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some service interface; the indirect coupling or communication connection between apparatuses or units may be electrical or other forms.

[0075] The above are merely exemplary embodiments of this disclosure and should not be construed as limiting the scope of this disclosure. Any equivalent changes and modifications made in accordance with the teachings of this disclosure shall still fall within the scope of this disclosure. Other embodiments of this disclosure will readily conceive of those skilled in the art upon consideration of the specification and the disclosure of practical truths.

[0076] This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not described in this disclosure. The specification and embodiments are to be considered exemplary only, and the scope and spirit of this disclosure are defined by the claims.

Claims

1. A trace gas detection system based on sample introduction and cleaning, characterized in that, The system includes: a control unit, an injection valve group, a first branch valve group, a second branch valve group, an exhaust valve group, a first valve, a second valve, a main injection pipeline, a first pump, a second pump, a trace sensor, an auxiliary sensor, an environmental measurement sensor, a carrier gas module, and multiple exhaust components. The control unit is used to acquire the first sample concentration detected by the trace sensor, and when the first sample concentration is less than a preset lower limit of the gas concentration threshold, it controls the first pump and the second pump to switch the preset flow measurement mode to a sealed measurement mode. The control unit is also used to perform cleaning control according to a preset cleaning path. The injection module is connected to the injection valve group, which is used to transmit the injection gas output by the injection module to the main injection pipeline. The second valve is connected to the main injection pipeline and the second branch valve group, and the second valve is used to control the direction of the cleaning path. The first end of the first valve is connected to the main injection pipeline, and the second end of the first valve is connected to the carrier gas module and the first branch valve group respectively. The first valve is used to transfer the injection gas of the main injection pipeline to the first branch valve group, or to control the cleaning of the main injection pipeline. The first branch valve group is connected to the carrier gas module, the first end of the trace sensor, the first end of the auxiliary sensor and the first end of the environmental measurement sensor respectively. The second end of the trace sensor, the second end of the auxiliary sensor and the second end of the environmental measurement sensor are connected to the second branch valve group. The first branch valve group is used to transmit the injection gas or the cleaning gas output by the carrier gas module. The second branch valve group is connected to the first end of the first pump and the first end of the second pump respectively. The first pump and the second pump are both used to control the entry of the sample gas or the cleaning gas, and to control the gas path to be emptied. The second end of the first pump is connected to the exhaust component, and the second end of the second pump is connected to the outlet valve group. The outlet valve group is correspondingly connected to the exhaust component, and the exhaust component is used to discharge the sample gas or the cleaning gas.

2. The trace gas detection system based on sample introduction and cleaning according to claim 1, characterized in that, The first branch valve group includes a third valve, a fourth valve, and a fifth valve. The carrier gas module is connected to the third valve, the fourth valve, and the fifth valve, respectively. The third valve is connected to the first end of the environmental measurement sensor, and the second end of the environmental measurement sensor is connected to the second branch valve group. The fourth valve is connected to the first end of the trace sensor, and the second end of the trace sensor is connected to the second branch valve group. The fifth valve is connected to the first end of the auxiliary sensor, and the second end of the auxiliary sensor is connected to the second branch valve group.

3. The trace gas detection system based on sample introduction and cleaning according to claim 2, characterized in that, The second branch valve group includes a sixth valve, a seventh valve, and an eighth valve. The second end of the environmental measurement sensor is connected to the sixth valve, which is connected to both the first pump and the second pump. The second end of the trace sensor is connected to the seventh valve, which is connected to both the first pump and the second pump. The second end of the auxiliary sensor is connected to the eighth valve, which is connected to both the first pump and the second pump.

4. The trace gas detection system based on sample introduction and cleaning according to claim 2, characterized in that, The system further includes a sample gas filtration module. The first end of the sample gas filtration module is connected to the second end of the first valve, and the second end of the sample gas filtration module is connected to the carrier gas module, the third valve, the fourth valve, and the fifth valve, respectively. The sample gas filtration module is used to filter particulate matter and water mist from the sample gas.

5. The trace gas detection system based on sample introduction and cleaning according to claim 4, characterized in that, The carrier gas module includes a carrier gas MEMS sensor and a ninth valve. The first end of the carrier gas MEMS sensor is connected to the carrier gas unit, and the second end of the carrier gas MEMS sensor is connected to the ninth valve. The ninth valve is connected to the sample gas filtration module, the third valve, the fourth valve, and the fifth valve. The carrier gas unit is used to generate the cleaning gas, the carrier gas MEMS is used to monitor the baseline state of the cleaning gas, and the ninth valve is used to control the flow direction of the cleaning gas.

6. A trace gas detection method based on sample introduction and cleaning, characterized in that, Applied to any one of the trace gas detection systems based on sample introduction and cleaning as described in claims 1-5, the method comprises: Acquire the injection gas, the first sample concentration detected by the trace sensor, the second sample concentration detected by the auxiliary sensor, the environmental data detected by the environmental measurement sensor, and the preset flow measurement mode; In the flow measurement mode, the injection gas is controlled to be introduced; If the concentration of the first sample is less than the preset lower limit of the gas concentration threshold, the flow measurement mode is switched to the sealed measurement mode. The concentration of the first sample is compensated using the environmental data and the concentration of the second sample to obtain the concentration of the detected sample. In the sealed measurement mode, after the concentration of the sample is obtained, the carrier gas module is controlled to output cleaning gas. According to the preset cleaning path, the cleaning gas is used to clean the sample inlet valve group, the first branch valve group, the second branch valve group, the outlet valve group, the first valve, the second valve, the first pump, the second pump, the trace sensor, the auxiliary sensor, the environmental measurement sensor, and multiple exhaust components. After cleaning is completed, the next sample inlet gas is obtained for sample concentration detection.

7. The trace gas detection method based on sample introduction and cleaning according to claim 6, characterized in that, When the concentration of the first sample is less than a preset lower limit of the gas concentration threshold, the step of switching the flow measurement mode to a sealed measurement mode includes: In the early stage of the flow measurement mode, the first pump and the second pump are used for coordinated injection to achieve gas displacement. During the middle of the sample injection in the flow measurement mode, the first pump or the second pump is turned off, and constant flow suction is performed using the second pump or the first pump. In the later stage of the flow measurement mode, when the concentration of the first sample is less than the preset lower limit of the gas concentration threshold, the second pump and the first pump are turned off to stabilize the pressure and switch to the sealed measurement mode. The early stage of the sample injection, the middle stage of the sample injection, and the late stage of the sample injection are spaced apart by a preset sample injection time.

8. The trace gas detection method based on sample introduction and cleaning according to claim 6, characterized in that, In the flow measurement mode, controlling the injection of the injection gas includes: In the flow measurement mode, when the concentration of the first sample is greater than or equal to the lower limit of the gas concentration threshold and less than or equal to the upper limit of the preset gas concentration threshold, the opening of the third valve, the fourth valve and the fifth valve are reduced, the suction speed of the first pump or the suction speed of the second pump is reduced, so that the injection module slows down the injection of the injection gas and prolongs the measurement time. In the flow measurement mode, when the concentration of the first sample is greater than the preset upper limit of the gas concentration threshold, the opening of the third, fourth and fifth valves is increased to increase the suction speed of the first pump or the second pump, so that the injection module can accelerate the injection of the sample gas and shorten the measurement time.

9. The trace gas detection method based on sample introduction and cleaning according to claim 6, characterized in that, The cleaning path includes a main injection line cleaning path, which includes a forward cleaning path and a reverse cleaning path. The forward cleaning path involves outputting cleaning gas through a carrier gas module, transmitting the cleaning gas to a first valve through a sample gas filtration module, inputting the cleaning gas into the main sample inlet pipeline through the first valve, transmitting it to a first pump or a second pump through a second valve, discharging the cleaning gas from the first pump through an exhaust component, and discharging the cleaning gas from the second pump through the outlet valve group and then through the exhaust component. The reverse cleaning path involves outputting cleaning gas through a carrier gas module, transmitting the cleaning gas to the environmental measurement sensor through the third valve in the first branch valve group, transmitting the cleaning gas to the second pump through the sixth valve in the second branch valve group, and finally discharging it through the exhaust component after passing through the outlet valve group.

10. The trace gas detection method based on sample introduction and cleaning according to claim 9, characterized in that, The cleaning path includes a dead space cleaning path; The dead space cleaning path is as follows: when the sample gas collection bag is detected to be pulled out by the sample injection module, cleaning gas is output through the carrier gas module, the cleaning gas is transmitted to the environmental measurement sensor through the third valve in the first branch valve group, the cleaning gas is transmitted to the second pump through the sixth valve in the second branch valve group, the second pump transmits the cleaning gas to the outlet valve group, and the gas is discharged through the exhaust component of the sample injection module to clean the sample injection module.

Images