CN110554028B - Gas detection method and gas detection system based on same - Google Patents
Gas detection method and gas detection system based on same Download PDFInfo
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- CN110554028B CN110554028B CN201910991947.6A CN201910991947A CN110554028B CN 110554028 B CN110554028 B CN 110554028B CN 201910991947 A CN201910991947 A CN 201910991947A CN 110554028 B CN110554028 B CN 110554028B
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- 238000001514 detection method Methods 0.000 title claims abstract description 276
- 230000007246 mechanism Effects 0.000 claims abstract description 255
- 238000000034 method Methods 0.000 claims abstract description 18
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims description 44
- 238000005070 sampling Methods 0.000 claims description 31
- 238000012937 correction Methods 0.000 claims description 17
- 230000004044 response Effects 0.000 claims description 17
- 238000004458 analytical method Methods 0.000 claims description 9
- 238000000835 electrochemical detection Methods 0.000 claims description 7
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- 101000872083 Danio rerio Delta-like protein C Proteins 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 6
- 239000007789 gas Substances 0.000 description 304
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 27
- 230000001105 regulatory effect Effects 0.000 description 6
- 238000013461 design Methods 0.000 description 5
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 4
- 229910002091 carbon monoxide Inorganic materials 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
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- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- 206010017740 Gas poisoning Diseases 0.000 description 1
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- 238000004868 gas analysis Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
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Abstract
The invention discloses a gas detection method and a gas detection system based on the method, wherein the method comprises the following steps: the gas sample is respectively introduced into a first gas detection mechanism and a second gas detection mechanism for detection, so as to obtain a detection concentration result value C1 of the first gas detection mechanism and a detection concentration result value C2 of the second gas detection mechanism; calculating a result difference delta C and a result percentage difference value & C, comparing the delta C with a preset result difference value judgment value A, comparing the & C with a preset result percentage difference value judgment value B, taking C1 as a final detection result if delta C is less than or equal to A and/or & C is less than or equal to B, and taking C2 as a final detection result if delta C is more than A and & C is more than B. The invention detects through two gas detection mechanisms with different detection principles, and corrects the detection result deviation of one gas detection mechanism in real time by using the detection result of the other gas detection mechanism, thereby ensuring higher detection accuracy.
Description
Technical Field
The invention relates to the field of gas analysis and detection, in particular to a gas detection method and a gas detection system based on the method.
Background
The measurement of the components and the concentration of the expired gas of the human body can assist doctors in diagnosing diseases of patients, monitoring disease states, observing treatment effects and the like, such as expired nitric oxide for detecting asthma and expired carbon monoxide for detecting gas poisoning.
Exhaled breath nitric oxide detection has become a key index for clinically judging respiratory tract diseases in the world and in the home, but the detection module of the currently commercialized exhaled breath nitric oxide analyzer is an electrochemical method, such as the NIOX VERO model product of circasia, the sensitivity and stability of which cannot be guaranteed, although the standard gas can be used for calibration, the concentration of nitric oxide in human exhalations is in ppb level (10 -9 L/L), preferably using ppb amount standard gas for calibration, but the commercial standard gas is ppm level for ensuring precision and storage, and the direct calibration by the ppm level standard gas can introduce larger error; electrochemical detection is susceptible to ambient temperature, humidity, and background shifts, and natural decay with time.
Disclosure of Invention
The invention aims to provide a more accurate gas detection method and a gas detection system based on the method.
In order to solve the technical problems, the invention adopts the following technical scheme: a gas detection method adopts a first gas detection mechanism and a second gas detection mechanism with different detection principles, and comprises the following steps:
(1) Analysis
Collecting a gas sample, and respectively introducing the gas sample into a first gas detection mechanism and a second gas detection mechanism for detection to obtain a detection concentration result value C1 of the first gas detection mechanism and a detection concentration result value C2 of the second gas detection mechanism;
(2) Judging
Calculating the result difference DeltaC and the result percentage difference&C，△C＝∣C1-C2∣，Comparing DeltaC with a preset result difference judgment value A,&c is compared with a preset result percentage difference judgment value B, and if delta C is less than or equal to A and/or is satisfied&C is less than or equal to B, C1 is taken as a final detection result, and if delta C > A and delta C > A are satisfied&C > B, then C2 is taken as the final detection result.
Further, the first gas detection mechanism adopts an electrochemical detection principle, and the second gas detection mechanism adopts a chemiluminescent detection principle.
A gas detection system based on the gas detection method comprises a first gas detection mechanism and a second gas detection mechanism which are different in detection principle.
Further, the device also comprises a gas sampling mechanism, a first gas storage mechanism and a second gas storage mechanism, wherein the gas inlet of the first gas storage mechanism and the gas inlet of the second gas storage mechanism are respectively communicated with the gas outlet of the gas sampling mechanism, the gas outlet of the first gas storage mechanism is communicated with the first gas detection mechanism, and the gas outlet of the second gas storage mechanism is communicated with the second gas detection mechanism.
Further, the device also comprises an ozone generating mechanism, the second gas detecting mechanism adopts a chemiluminescent method detection principle, a reaction chamber is connected between the gas outlet of the second gas storing mechanism and the second gas detecting mechanism, and the gas outlet of the ozone generating mechanism is communicated with the reaction chamber.
Further, the device also comprises an emptying pipe and an ozone generating mechanism air inlet pipe, wherein a filtering mechanism is arranged on the ozone generating mechanism air inlet pipe, the gas sampling mechanism comprises a sampling pipe, the air outlet of the sampling pipe is communicated with the air inlet of the first gas storage mechanism and the air inlet of the second gas storage mechanism through a valve array I, the air outlet of the ozone generating mechanism air inlet pipe is communicated with the air inlet of the ozone generating mechanism and the air inlet of the emptying pipe through a valve array II, and the valve array I is communicated with the valve array II through a connecting pipe;
the valve array I can control the gas outlet of the sampling pipe, the gas inlet of the gas storage mechanism I, the gas inlet of the gas storage mechanism II and the connection pipe to be mutually connected and disconnected, and the valve array II can control the gas outlet of the gas inlet pipe of the ozone generating mechanism, the gas inlet of the emptying pipe and the connection pipe to be mutually connected and disconnected.
Further, an exhaust pipe is connected to the first gas storage mechanism, and a valve is installed on the exhaust pipe.
Further, before the gas detection system is used for detection, the first gas detection mechanism and the second gas detection mechanism are calibrated in advance, and the specific process of calibration is as follows: and (3) introducing standard gas with known concentration C into the first gas detection mechanism and the second gas detection mechanism respectively for detection to obtain a response signal S1 of the standard gas with known concentration C of the first gas detection mechanism and a response signal S2 of the standard gas with known concentration C of the second gas detection mechanism, and then calculating a correlation coefficient K1 of the response signal of the first gas detection mechanism and the gas concentration and a correlation coefficient K2 of the response signal of the second gas detection mechanism and the gas concentration, wherein K1=S1/C and K2=S2/C.
Further, the gas detection system adopts a correction working mode, and the specific implementation mode of the correction working mode is as follows: when the gas detection system detects the condition of taking C2 as a final detection result, correcting K1 by using C1 and C2 under the detection condition, namely replacing K1 by using a correction value K1', wherein K1' =C1×K1/C2 is taken as the basis of the next detection.
Further, the gas detection system is self-calibrated at intervals, and the specific implementation mode of the self-calibration is as follows: collecting a gas sample, respectively introducing the gas sample into a first gas detection mechanism and a second gas detection mechanism for detection to obtain a detection concentration result value C1 'of the first gas detection mechanism and a detection concentration result value C2' of the second gas detection mechanism, and then correcting K1 by using C1 'and C2', namely replacing K1 by using a correction value K1', wherein K1' = C1 '. Times.K1/C2' is used as a subsequent detection basis.
The beneficial effects of the invention are as follows:
the gas detection method carries out detection through two gas detection mechanisms with different detection principles, and through the design and judgment steps, the detection result deviation of one gas detection mechanism can be corrected in real time by using the detection result of the other gas detection mechanism, so that higher detection accuracy can be ensured.
The gas detection system of the invention works based on the gas detection method, so the invention has the advantages of stability, reliability and high accuracy.
Drawings
FIG. 1 is a schematic diagram of a gas detection system according to an embodiment of the present invention.
FIG. 2 is a schematic diagram illustrating operation of a gas detection system according to an embodiment of the present invention.
The components in the drawings are marked as follows: a sampling tube 1, a gas detection mechanism I, a gas detection mechanism II, a gas storage mechanism I, a gas storage mechanism II, an ozone generating mechanism 6, a reaction chamber 7, a valve array I, a valve array II, a valve array 10, an emptying tube 11, an ozone generating mechanism air inlet tube 12, a filtering mechanism 13, a connecting tube 14, an exhaust tube 15, a flow regulating valve 16, a pressure sensor 17, a flow rate sensor 18, a pump 19, a pump 20, a pump 21, a pump three and a humidity balancing mechanism 22.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. Embodiments and features of embodiments in this application may be combined with each other without conflict. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and rear … …) are included in the embodiments of the present invention, the directional indications are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are correspondingly changed.
In addition, if there is a description of "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" as it appears throughout includes three parallel schemes, for example "A and/or B", including the A scheme, or the B scheme, or the scheme where A and B are satisfied simultaneously. In addition, "a plurality of" means two or more. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
The gas detection method adopts a first gas detection mechanism and a second gas detection mechanism with different detection principles, and comprises the following steps:
(1) Analysis
Collecting a gas sample, and respectively introducing the gas sample into a first gas detection mechanism and a second gas detection mechanism for detection to obtain a detection concentration result value C1 of the first gas detection mechanism and a detection concentration result value C2 of the second gas detection mechanism;
(2) Judging
Calculating the result difference DeltaC and the result percentage difference&C，△C＝∣C1-C2∣，Comparing DeltaC with a preset result difference judgment value A,&c is compared with a preset result percentage difference judgment value B, and if delta C is less than or equal to A and/or is satisfied&C is less than or equal to B, C1 is taken as a final detection result, and if delta C > A and delta C > A are satisfied&C > B, then C2 is taken as the final detection result.
The gas detection method carries out detection through two gas detection mechanisms with different detection principles, and through the design and judgment steps, the detection result deviation of one gas detection mechanism can be corrected in real time by using the detection result of the other gas detection mechanism, so that higher detection accuracy can be ensured.
The preset result difference value judgment value A and the preset result percentage difference value judgment value B can be selected according to the gas components to be detected, so long as the accuracy of the result can be ensured, and the following preferred selection ranges of the judgment values of several common gases are provided:
for Nitric Oxide (NO), A is 3ppb to 10ppb, and B is 5% to 20%;
for hydrogen sulfide (H) 2 S), wherein A is 3ppb to 10ppb, and B is 5% to 20%;
for carbon monoxide (CO), A is 0.1ppm to 2ppm, and B is 5 to 20 percent;
for hydrogen (H) 2 ) A is 0.1ppm to 2ppm, and B is 5 percent to 20 percent;
for methane (CH) 4 ) 0.1ppm to 2ppm of A and 5 to 20 percent of B.
According to the above-mentioned gas detection method, the present invention provides a gas detection system based on the method, and the following description of the gas detection system of the present invention refers to fig. 1 and 2.
The gas detection system of the invention obviously comprises a first gas detection mechanism 2 and a second gas detection mechanism 3 which have different detection principles. The gas detection system works based on the gas detection method, so that the gas detection system has the advantages of stability, reliability and high accuracy. The measurement method is described with reference to the measurement flow chart in fig. 2 and the above description of the gas detection method of the present invention.
Preferably, the first gas detection mechanism adopts an electrochemical detection principle, and the second gas detection mechanism adopts a chemiluminescent detection principle. In the process of implementing the invention, the inventor finds that the electrochemical method detection is corrected by the chemiluminescent method detection, so that the correction effect is more reliable and the accuracy is higher.
In specific implementation, the first gas detection mechanism can adopt a MNO-LO type sensor of CityTech or a NO/C-1 type sensor of Membrapor, and the second gas detection mechanism can adopt a 42i type trace nitrogen oxide analyzer of ThermoFisher or an i11 NO-NO of Beijing, which is a company of Zuo science and technology 2 -a NOx analyzer.
In an embodiment, before the gas detection system is used for detection, the first gas detection mechanism 2 and the second gas detection mechanism 3 are calibrated in advance, and the specific process of calibration is as follows: and (3) introducing standard gas with known concentration C (the concentration C is based on the component to be detected) into the first gas detection mechanism 2 and the second gas detection mechanism 3 respectively to detect, so as to obtain a response signal S1 of the standard gas with the known concentration C of the first gas detection mechanism 2 and a response signal S2 of the standard gas with the known concentration C of the second gas detection mechanism 3, and then calculating a correlation coefficient K1 of the response signal of the first gas detection mechanism 2 and the gas concentration and a correlation coefficient K2 of the response signal of the second gas detection mechanism 3 and the gas concentration, wherein K1=S1/C and K2=S2/C. Calibration is a necessary step required by most of the existing gas detection mechanisms, and the subsequent detection results are obtained through the inverse deduction of the correlation coefficient and the response signal.
In an embodiment, the gas detection system adopts a correction working mode, and a specific implementation manner of the correction working mode is as follows: when the gas detection system detects the condition of taking C2 as a final detection result, correcting K1 by using C1 and C2 under the detection condition, namely replacing K1 by using a correction value K1', wherein K1' =C1×K1/C2 is taken as the basis of the next detection. When the detection condition of taking C2 as a final detection result appears, the drift of the gas detection mechanism appears, and because the invention adopts a correction working mode, the correction value K1' is used for replacing K1 when the drift appears, thus the system can be calibrated in real time, the drift phenomenon occurring in the long-term use process can be reduced, and the long-term use stability is ensured.
In an embodiment, the gas detection system is self-calibrated at intervals (time intervals are determined according to requirements), and the specific implementation manner of self-calibration is as follows: collecting a gas sample, respectively introducing the gas sample into a first gas detection mechanism 2 and a second gas detection mechanism 3 for detection to obtain a detection concentration result value C1 'of the first gas detection mechanism 2 and a detection concentration result value C2' of the second gas detection mechanism 3, and then correcting K1 by using C1 'and C2', namely replacing K1 by using a correction value K1', wherein K1' = C1 '. Times.K1/C2' is used as a subsequent detection basis. The standard gas provided by the standard substance qualification company is used for calibrating the gas detection system, but the standard gas is stored in a vacuum steel bottle and is difficult to use at a client in time, the first gas detection mechanism is easily influenced by environmental temperature and humidity due to the characteristic of chemical analysis of the first gas detection mechanism, fluctuation can occur in each period of time, the second gas detection mechanism can maintain long-time stability by only periodically calibrating the second gas detection mechanism with high-concentration standard gas every year, and the cost and time of the traditional calibration process can be greatly reduced by using the self-calibration method.
In an embodiment, the gas detection system of the present invention further includes a gas sampling mechanism, a first gas storage mechanism 4 and a second gas storage mechanism 5, where the gas inlet of the first gas storage mechanism 4 and the gas inlet of the second gas storage mechanism 5 are respectively communicated with the gas outlet of the gas sampling mechanism, the gas outlet of the first gas storage mechanism 4 is communicated with the first gas detection mechanism 2, and the gas outlet of the second gas storage mechanism 5 is communicated with the second gas detection mechanism 3. The design can ensure that the gas samples entering the first gas storage mechanism and the second gas storage mechanism are the same, thereby ensuring the reliability of the test correction result. In practice, the first and second gas storage means may be any container having an interior cavity for storing gas.
In an embodiment, the gas detection system of the present invention further includes an ozone generating mechanism 6, the second gas detecting mechanism 3 adopts a chemiluminescent detection principle, a reaction chamber 7 is connected between the gas outlet of the second gas storage mechanism 5 and the second gas detecting mechanism 3, and the gas outlet of the ozone generating mechanism 6 is communicated with the reaction chamber 7. Ozone is needed in the detection principle of the chemiluminescence method, so that in the embodiment, an ozone generating mechanism needs to be configured, ozone generated by the ozone generating mechanism acts on a gas sample in a reaction chamber and then enters a second gas detecting mechanism for detection, detection accuracy can be guaranteed, and the device is simple in structure and convenient to operate.
In one embodiment, the first gas storage mechanism 4 is connected to a gas exhaust pipe 14, and a valve 15 is installed on the gas exhaust pipe 14. By the design, when the gas sample enters the first gas storage mechanism, the valve is opened, so that the original gas in the first gas storage mechanism can be discharged through the exhaust pipe, and interference detection is prevented. In particular, the valve 15 may be a check valve or a stop valve.
In one embodiment, the sampling tube 1 is provided with a flow regulating valve 16, a pressure sensor 17 and a flow rate sensor 18. The flow regulating valve is used for regulating the flow of the gas sample in a proper range, the pressure sensor and the flow rate sensor are used for monitoring the pressure and the flow rate of the gas sample, only the gas sample meeting the requirements is allowed to be introduced into the first gas storage mechanism and the second gas storage mechanism, the gas sample not meeting the requirements is discharged into the atmosphere (according to the regulations in the "on-line and off-line measuring technical standard guidelines for the nitric oxide of the respiratory tract and the nasal exhaled in the American society of thoracic (ATS) and the European society of respiratory (ERS) 2005", the sample gas collection for detecting the nitric oxide of the exhaled gas needs to meet the requirements that the exhaled flow rate is 50+/-5 ml/s, and the exhaled pressure is more than or equal to 5cmH 2 O, so that the unified standard can be used to judge the test result).
In one embodiment, a humidity balance mechanism 22 is connected between the first gas storage mechanism 4 and the first gas detection mechanism 2. The humidity balance mechanism is used for adjusting the humidity of a gas sample, the detection result of the first gas detection mechanism is greatly affected by the humidity of the sample gas, the humidity of the gas is balanced through the humidity balance mechanism before the gas enters the first gas detection mechanism each time, if the humidity is greater than the current environment humidity, the sample gas is dehumidified, and if the humidity is less than the current environment humidity, the sample gas is humidified.
In an embodiment, the gas detection system of the invention further comprises an emptying pipe 10 and an ozone generation mechanism air inlet pipe 11, wherein a filtering mechanism 12 is arranged on the ozone generation mechanism air inlet pipe 11, the gas sampling mechanism comprises a sampling pipe 1, the air outlet of the sampling pipe 1 is communicated with the air inlet of the first gas storage mechanism 4 and the air inlet of the second gas storage mechanism 5 through a first valve array 8, the air outlet of the ozone generation mechanism air inlet pipe 11 is communicated with the air inlet of the ozone generation mechanism 6 and the air inlet of the emptying pipe 10 through a second valve array 9, and the first valve array 8 is communicated with the second valve array 9 through an engagement pipe 13;
the valve array I8 can control the on-off of the air outlet of the sampling tube 1, the air inlet of the air storage mechanism I4, the air inlet of the air storage mechanism II 5 and the connecting tube 13, and the valve array II 9 can control the on-off of the air outlet of the air inlet pipe 11 of the ozone generating mechanism, the air inlet of the ozone generating mechanism 6, the air inlet of the emptying pipe 10 and the connecting tube 13.
The air inlet pipe of the ozone generating mechanism is arranged for introducing raw material gas, in particular air, into the ozone generating mechanism, and the filtering mechanism is arranged for filtering moisture, dust and substances to be detected (NO, CO and the like) in the air so as to avoid interference in ozone generation and detection;
the emptying pipe and the parts are connected through the valve arrays I and II, so that the use is more convenient, for example, when a gas sample collected by the sampling pipe does not meet the requirements, the valve array I is used for only conducting the gas outlet of the sampling pipe with the connecting pipe, the other parts based on the valve array I are mutually cut off, the valve array II is used for only conducting the connecting pipe with the gas inlet of the emptying pipe, and the other parts based on the valve array II are mutually cut off, so that the gas sample which does not meet the requirements can be sequentially discharged into the atmosphere through the connecting pipe and the emptying pipe;
in addition, for most gas detection mechanisms, the response signal of the gas to be detected is obtained based on a blank control of a blank gas containing no gas to be detected, for example, the detection signal of the gas to be detected having a concentration of C is S C The detection signal of the blank gas without the gas to be detected is S 0 Response signal s=s of the gas to be measured with concentration C C -S 0 The blank gas can be conveniently collected through the design, specifically, through the first valve array, only the connecting pipe is communicated with the air inlet of the first gas storage mechanism and the air inlet of the second gas storage mechanism, other parts based on the first valve array are mutually cut off, through the second valve array, only the air outlet of the air inlet pipe of the ozone generating mechanism is communicated with the connecting pipe, and other parts based on the second valve array are mutually cut offCut off, the filtered air is blank gas, and enters the first and second gas storage mechanisms through the connecting pipe, and is detected to obtain S 0 。
The gas detection system can sample gas exhaled from the gas inlet of the sampling tube, or can collect a gas sample into the gas bag, then connect the gas bag with the gas inlet of the sampling tube, and extract the gas sample from the gas bag during testing.
During breath sampling, because the expired air has a certain flow rate, equipment for providing gas flow power, such as a pump, is not required to be arranged in the system, and the expired air can directly flow to the first gas detection mechanism and the second gas detection mechanism.
If the collected gas sample has no flow rate, such as the air bag sampling mode, a pump or other equipment capable of providing gas flow power needs to be arranged on the corresponding channel so as to introduce the gas sample into the first and second gas detection mechanisms. For example, in one implementation, a pump one 19 is connected between the first gas storage mechanism 4 and the first gas detection mechanism 2, a pump two 20 is connected between the second valve array 9 and the gas inlet of the ozone generating mechanism 6, and a pump three 21 is further included, and the gas inlet of the pump three 21 is communicated with the first gas storage mechanism 4. The first pump is used for sucking the gas sample in the first gas storage mechanism into the first gas detection mechanism, the second pump is used for sucking air into the ozone generation mechanism, meanwhile, the ozone generation mechanism is communicated with the reaction chamber, so that the gas sample can be extruded into the second gas detection mechanism, the third pump is used for sampling, and the gas sample in the air bag can be sucked into the first gas storage mechanism and extruded into the second gas storage mechanism.
Taking the gas detection system of the embodiment shown in fig. 1 as an example, the following general description will be given of the usage of the system:
when the expired air is sampled, the pump III is normally closed, the valve is opened, the valve array I is switched, the sampling pipe is kept to be communicated with the first gas storage mechanism and the second gas storage mechanism, thus the expired air meeting the requirements is regulated by the flow regulating valve to enter the first gas storage mechanism and the second gas storage mechanism, the valve is closed, and the pump I and the pump II are openedThe switching valve array II keeps the air inlet pipe of the ozone generating mechanism communicated with the ozone generating mechanism, so that a gas sample stored in the gas storage mechanism I enters the gas detection mechanism I to obtain a detection signal S1 of the gas to be detected of the gas detection mechanism I Total (S) The gas sample stored by the second gas storage mechanism and ozone generated by the ozone generating mechanism enter the reaction chamber and then enter the second gas detection mechanism to obtain a detection signal S2 of the gas to be detected of the second gas detection mechanism Total (S) After the detection is finished, the first valve array and the second valve array are switched to keep the air inlet pipe of the ozone generating mechanism communicated with the first gas storage mechanism and the second gas storage mechanism, and blank air filtered by the filtering mechanism enters the first gas storage mechanism and the second gas storage mechanism and then operates in the same way to obtain a detection signal S1 of the blank air of the first gas detection mechanism 0 Blank air detection signal S2 of gas detection mechanism II 0 Finally, a response signal S1=S1 of the gas to be detected of the first gas detection mechanism is obtained Total (S) -S1 0 Response signal s2=s2 of gas to be detected of gas detection mechanism two Total (S) -S2 0 ；
When the air bag is pumped and sampled, the valve is normally closed, the pump III is opened, gas enters the first storage mechanism and the second storage mechanism, and when the gas is detected, the pump III is closed, and the detection step is the same as the expiration sampling step.
Of course, the specific detection sequence can be adjusted as long as S1 can be detected Total (S) 、S1 0 、S2 Total (S) 、S2 0 And (3) obtaining the product.
In practice, the filter means may be activated carbon or alumina-supported potassium permanganate, the humidity balance means may be nafion tube of permapure U.S. and the ozone generator means may be ozone fitting KS-3G of Mo Geli (bergamot) environmental protection technologies.
The valve array I and the valve array II in the invention have the main functions of switching on and off among the components, introducing the gas sample which is collected by the sampling tube and meets the requirements into the gas storage mechanism I and the gas storage mechanism II, discharging the gas sample which is collected by the sampling tube and does not meet the requirements into the atmosphere through the emptying tube, introducing the filtered gas obtained by the air inlet pipe of the ozone generating mechanism into the ozone generating mechanism to generate ozone, and introducing the filtered gas obtained by the air inlet pipe of the ozone generating mechanism into the gas storage mechanism I and the gas storage mechanism II as blank gas.
The correction working mode of the invention can carry out the following operations along with the accumulation of the data volume:
(1) A priori model database is obtained through calibration, and the method comprises the following steps: recording result values C1, result values C2 and analysis parameters K1 of the gas detection mechanism 1 corresponding to standard gases with different known concentrations under different temperature and humidity conditions to form a standard gas result database; recording the result values C1, the result values C2 and the analysis parameters K1 of the gas detection mechanism 1 corresponding to different expiration values under different temperature and humidity conditions, forming a test result database, and calculating the function relation f between the environment temperature T (T), the environment humidity RH (T), the result values C1 (T), the result values C2 (T) and the analysis parameters K1 (T) of the gas detection mechanism 1, the environment temperature T (0), the environment humidity RH (0) and the initial analysis parameters K1 (0) during real-time detection;
(2) The result value C1 (T) is calculated through the environment temperature T (T), the environment humidity RH (T), the initial analysis parameter K1 (0) and the functional relation f during each detection, the result value C1 (T) is compared with the result value C2 (T), whether the difference value of the two result values exceeds +/-Appb or +/-B, if the difference value exceeds the range, the calculation is successful, the result value C1 (T) is displayed, if the difference value does not exceed the range, the calculation is failed, the final result is displayed, the result value C2 (T) is displayed, the result record is put into another classifier, reinforcement learning is carried out on failed data, the relevant characteristics of the failed data are learned, and the classifier and the existing function together determine the result value C1 (T).
Taking the electrochemical detection principle adopted by the first gas detection mechanism and the chemiluminescent detection principle adopted by the second gas detection mechanism as an example, the ingredient to be detected is Nitric Oxide (NO), and the accuracy of the invention is verified by using the standard gas concentration, and the results are shown in the following tables 1 and 2:
TABLE 1
TABLE 2
As can be seen from tables 1 and 2, the detection result deviation of the electrochemical detection mechanism is corrected in real time by the chemiluminescent detection mechanism, so that the accuracy is high, and the higher detection accuracy can be ensured.
It should be understood that the examples and embodiments described herein are for illustrative purposes only and are not intended to limit the present invention, and that various modifications or changes in light thereof will be suggested to persons skilled in the art and are to be included within the spirit and purview of this application.
Claims (9)
1. A gas detection method, characterized in that: a first gas detection mechanism and a second gas detection mechanism with different detection principles are adopted, wherein the first gas detection mechanism adopts an electrochemical detection principle, and the second gas detection mechanism adopts a chemiluminescent detection principle; the method comprises the following steps:
(1) Analysis
Collecting a gas sample, and respectively introducing the gas sample into a first gas detection mechanism and a second gas detection mechanism for detection to obtain a detection concentration result value C1 of the first gas detection mechanism and a detection concentration result value C2 of the second gas detection mechanism;
(2) Judging
Calculating the result difference DeltaC and the result percentage difference&C，△C＝∣C1－C2∣，Comparing DeltaC with a preset result difference judgment value A,&c is compared with a preset result percentage difference judgment value B, and if delta C is less than or equal to A and/or is satisfied&C is less than or equal to B, C1 is taken as a final detection result, and if delta C > A and delta C > A are satisfied&C > B, then C2 is taken as the final detection result.
2. A gas detection system operating based on the gas detection method of claim 1, wherein: the device comprises a first gas detection mechanism and a second gas detection mechanism which are different in detection principle; the first gas detection mechanism adopts an electrochemical detection principle, and the second gas detection mechanism adopts a chemiluminescent detection principle.
3. The gas detection system of claim 2, wherein: the gas sampling device comprises a first gas sampling mechanism, a first gas storage mechanism and a second gas storage mechanism, wherein a gas inlet of the first gas storage mechanism and a gas inlet of the second gas storage mechanism are respectively communicated with a gas outlet of the gas sampling mechanism, a gas outlet of the first gas storage mechanism is communicated with the first gas detection mechanism, and a gas outlet of the second gas storage mechanism is communicated with the second gas detection mechanism.
4. A gas detection system according to claim 3, wherein: the device also comprises an ozone generating mechanism, wherein the second gas detecting mechanism adopts a chemiluminescent method detection principle, a reaction chamber is connected between the gas outlet of the second gas storing mechanism and the second gas detecting mechanism, and the gas outlet of the ozone generating mechanism is communicated with the reaction chamber.
5. The gas detection system of claim 4, wherein: the device comprises a first gas storage mechanism, a second gas storage mechanism, an ozone generation mechanism, a gas inlet pipe, a valve array I, a valve array II, a gas sampling mechanism, a gas inlet pipe, a gas sampling mechanism and a gas inlet pipe, wherein the gas inlet pipe of the ozone generation mechanism is provided with a filtering mechanism;
the valve array I can control the gas outlet of the sampling pipe, the gas inlet of the gas storage mechanism I, the gas inlet of the gas storage mechanism II and the connection pipe to be mutually connected and disconnected, and the valve array II can control the gas outlet of the gas inlet pipe of the ozone generating mechanism, the gas inlet of the emptying pipe and the connection pipe to be mutually connected and disconnected.
6. A gas detection system according to claim 3, wherein: and the first gas storage mechanism is connected with an exhaust pipe, and a valve is arranged on the exhaust pipe.
7. The gas detection system according to any one of claims 2 to 6, wherein: before the gas detection system is used for detection, the first gas detection mechanism and the second gas detection mechanism are calibrated in advance, and the specific process of calibration is as follows: and (3) introducing standard gas with known concentration C into the first gas detection mechanism and the second gas detection mechanism respectively for detection to obtain a response signal S1 of the standard gas with known concentration C of the first gas detection mechanism and a response signal S2 of the standard gas with known concentration C of the second gas detection mechanism, and then calculating a correlation coefficient K1 of the response signal of the first gas detection mechanism and the gas concentration and a correlation coefficient K2 of the response signal of the second gas detection mechanism and the gas concentration, wherein K1=S1/C and K2=S2/C.
8. The gas detection system of claim 7, wherein: the gas detection system adopts a correction working mode, and the specific implementation mode of the correction working mode is as follows: when the gas detection system detects the condition of taking C2 as a final detection result, correcting K1 by using C1 and C2 under the detection condition, namely replacing K1 by using a correction value K1', wherein K1' =C1×K1/C2 is taken as the basis of the next detection.
9. The gas detection system of claim 7, wherein: the gas detection system is self-calibrated at intervals, and the specific implementation mode of the self-calibration is as follows: collecting a gas sample, respectively introducing the gas sample into a first gas detection mechanism and a second gas detection mechanism for detection to obtain a detection concentration result value C1 'of the first gas detection mechanism and a detection concentration result value C2' of the second gas detection mechanism, and then correcting K1 by using C1 'and C2', namely replacing K1 by using a correction value K1', wherein K1' = C1 '. Times.K1/C2' is used as a subsequent detection basis.
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