CN204903445U - Hydrogen concentration detector - Google Patents
Hydrogen concentration detector Download PDFInfo
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- CN204903445U CN204903445U CN201520527034.6U CN201520527034U CN204903445U CN 204903445 U CN204903445 U CN 204903445U CN 201520527034 U CN201520527034 U CN 201520527034U CN 204903445 U CN204903445 U CN 204903445U
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Abstract
The utility model discloses a hydrogen concentration detector is the hydrogen concentration detector based on the patent of invention CN102180518B quick component of disclosed hydrogen, include quick resistance transducer of hydrogen and bleeder circuit, fall the filter circuit that makes an uproar, AD converting circuit, singlechip and control circuit, liquid crystal display circuit, warning circuit, humiture acquisition circuit, clock circuit and serial communication circuit, AD converting circuit includes the ADS1256 module, and humiture acquisition circuit includes the temperature and humidity sensor DHT11 module, the serial communication circuit be used for with host computer communication, transmit the testing result to the host computer and file and data analysis. The utility model discloses revise actual measurement hydrogen concentration, combination ambient temperature and humidity factor, reach true hydrogen concentration value. Hydrogen concentration detector possess the operating temperature height, longe -lived, sensitivity is high, short response time, stable good characteristics.
Description
Technical field
The utility model relates to a kind of Hydrogen Concentration Detector, is specifically related to a kind of Hydrogen Concentration Detector preparing hydrogen-sensitive element based on pentoxide nanowire by use, belongs to density of hydrogen sensing and measurement and control instrument technical field.
Background technology
Hydrogen is a kind of renewable green energy resource, and pollution-free, energy density is large and wide application etc. is more and more subject to the favor of people, and is widely used in industries such as chemical industry, space flight, military projects.But hydrogen belongs to flammable explosive gas, strict control is in use needed to prevent it from revealing, so study high performance hydrogen gas sensor and pick-up unit is very important.
At present, also there is many technical matterss in the hydrogen gas sensor of market application, as semi-conductor type hydrogen gas sensor need to heat under the high temperature conditions, power consumption is large, and can only qualitative detection, the accurate measurement of concentration cannot be realized; Catalytic combustion-type hydrogen gas sensor is also a kind of hot type element of hot operation, and its shortcoming is easily poisoning, and power consumption is large, and stability is bad; Galvanochemistry type hydrogen gas sensor does not need heating work, but operating temperature range is narrower, and electrolytic solution easily dries up, and the life-span is short; Optical type hydrogen gas sensor is that the quick material of hydrogen is coated onto on optical device, and this sensor easily occurs delamination, foaming phenomena after repeatedly circulating, and thus serviceable life is shorter.In addition, in current practical application also there is following shortcoming in hydrogen gas sensor:
1. can not produce the response linear with the quick concentration of hydrogen within the scope of wide density of hydrogen, insufficient sensitivity is high, the response time is long;
2. the impact of temperature, humidity, pressure etc. can not be solved well;
3. stability is bad.
For above problem, 201110026084.2) and obtain the authorization the applicant is in (application number: in application patent of invention on January 15th, 2011 " a kind of large area preparation method of pentoxide nanowire by use and hydrogen-sensitive element thereof ", utilize this Nb2O5 nano wire as sensitive material, by the hydrogen-sensitive element of Slag coating Pt electrode fabrication, there is the features such as size is little, low in energy consumption, at room temperature the speed of response and higher sensitivity are faster shown to hydrogeneous atmosphere, be expected to the size of reduction hydrogen sensor, power consumption and production cost.
On the other hand, by environment temperature and humidity effect, there is certain error in actual value and the actual value of density of hydrogen when measuring, and existing Hydrogen Concentration Detector device does not all consider that the party's face is loud, therefore needs the density of hydrogen to recording in real time to revise.
Summary of the invention
The purpose of this utility model overcomes background technology to ask a question, a kind of Hydrogen Concentration Detector is provided, the Hydrogen Concentration Detector based on the hydrogen-sensitive element disclosed in patent of invention CN102180518B, and combining environmental temperature and humidity factor, the density of hydrogen detected in real time is revised.Described Hydrogen Concentration Detector possesses that working temperature is high, the life-span long, highly sensitive, the response time is short, good stability feature.
In order to achieve the above object, the utility model is by the following technical solutions:
A kind of Hydrogen Concentration Detector, comprises hydrogen-sensitive element and bleeder circuit, noise reduction filtering circuit, A/D change-over circuit, single-chip microcomputer and control circuit, liquid crystal display circuit, warning circuit, humiture collection circuit, clock circuit and serial communication circuit; Described hydrogen-sensitive element comprises: the pentoxide nanowire by use film prepared by thermal oxidation method large area is as sensitive material, described sensitive material is stamped the electrode pattern mask plate made in advance, the preparation of described nano wire mould upper surface both sides has rectangle or circular point shape Pt electrode, described Pt electrode also has the copper conductor of drawing; Described A/D change-over circuit comprises ADS1256 module, described humiture collection circuit comprises Temperature Humidity Sensor DHT11 module, described serial communication circuit comprises CH340 module, and serial communication circuit is used for communicating with host computer, testing result is transferred to host computer and files and data analysis; Described clock circuit comprises the standard clock circuit module be connected with single-chip microcomputer, and described liquid crystal display circuit comprises the LCDs be connected with single-chip microcomputer, and described warning circuit comprises the sound and light alarm module be connected with single-chip microcomputer; It is characterized in that:
Described hydrogen-sensitive element and bleeder circuit are density of hydrogen signals collecting input circuits, described bleeder circuit comprises hydrogen-sensitive element and precision resistance, one end ground connection of hydrogen-sensitive element, the other end is connected to positive source after connecting with precision resistance again, the other end of hydrogen-sensitive element is also connected with described noise reduction filtering circuit input end, noise reduction filtering circuit output end is connected to signal input part the 7th pin of the ADS1256 module of A/D change-over circuit, A/D change-over circuit exports single-chip microcomputer and control circuit signal input part to after converting analog voltage signal to digital signal, described single-chip microcomputer goes out the real time resistance intermediate value of the quick resistance of hydrogen according to input voltage value and precision resistance computing the resistor value, meanwhile, described humiture collection circuit detects the temperature and humidity of test environment in real time by Temperature Humidity Sensor, then detection data are sent to single-chip microcomputer and control circuit,
Single-chip microcomputer and control circuit are according to real time humiture data and hydrogen quick resistance real time resistance value corresponding relation, the real time resistance intermediate value of the quick resistance of described hydrogen is revised, last again according to resistance---density of hydrogen data are sent on the display screen of liquid crystal display circuit by density of hydrogen proportionate relationship; When density of hydrogen is greater than limit value, single-chip microcomputer and control circuit start acoustic-optic alarm and send alerting signal.
A kind of Hydrogen Concentration Detector described above, it is characterized in that: described noise reduction filtering circuit comprises the first resistance and the second resistance, the first electric capacity and the second electric capacity, first resistance is signal input part, first resistance and the second resistant series, second resistance is signal output part, and one end of the first electric capacity and the second electric capacity is connected across the two ends of the second resistance, other end ground connection respectively.
A kind of Hydrogen Concentration Detector described above, is characterized in that: described single-chip microcomputer and control circuit comprise feed circuit, model is STC15F2K60S2 single-chip microcomputer, reset circuit; Described feed circuit comprise MAX603, MAX604 module, for being standard direct current 3.3V and 5V power supply by electric battery or external direct current power supply voltage stabilizing; Described reset circuit comprises reset switch S1, resistance R2 and R3, electric capacity C4, described reset switch S1 is connected with 5V power supply with one end of electric capacity C4, the other end of reset switch S1 is connected with resistance R2, the other end of resistance R2 is connected with one end of the other end of electric capacity C4 and resistance R3, the other end ground connection of resistance R3, one end of resistance R3 is connected to single-chip microcomputer the 13rd pin;
Signal output part the 22nd pin that the 3rd pin access Temperature Humidity Sensor DHT11 module output signal of described single-chip microcomputer STC15F2K60S2, the 18th pin and the 19th pin are connected to signal input part RXD and TXD of serial communication circuit respectively, the 36th pin connects A/D change-over circuit.
A kind of Hydrogen Concentration Detector described above, is characterized in that: have identical two-way density of hydrogen signals collecting input circuit, forms one main one of single-chip microcomputer for two-way density of hydrogen signals collecting input end MOSI and MISO; The noise reduction filtering circuit that each road density of hydrogen signals collecting input circuit includes hydrogen-sensitive element and bleeder circuit and is connected with bleeder circuit, the output terminal of described two noise reduction filtering circuit is connected to signal input part the 7th pin and the 8th pin of the ADS1256 module of A/D respectively, and signal output part the 22nd pin of described ADS1256 module and the 23rd pin are connected to single-chip microcomputer signal input part the 36th script and the 37th pin respectively.
The utility model beneficial effect is: the utility model Hydrogen Concentration Detector revises the density of hydrogen detected in real time based on hydrogen-sensitive element, combining environmental temperature and the humidity factor disclosed in the authorized patent of invention CN102180518B of the applicant, and described Hydrogen Concentration Detector possesses that working temperature is high, the life-span long, highly sensitive, the response time is short, good stability feature.
Accompanying drawing explanation
Fig. 1 is the utility model example structure schematic diagram;
Fig. 2 is single bleeder circuit schematic diagram;
Fig. 3 is two independent noise reduction filtering circuit theory diagrams;
Fig. 4 is A/D change-over circuit schematic diagram;
Fig. 5 is single chip circuit schematic diagram;
Fig. 6 is reset circuit schematic diagram;
Fig. 7 is humiture collection circuit theory diagrams;
Fig. 8 is serial communication circuit schematic diagram;
Fig. 9 is feed circuit schematic diagrams;
Figure 10 is the graph of relation of hydrogen-sensitive element resistance value and density of hydrogen;
Figure 11 is the variation relation curve map of hydrogen-sensitive element resistance value and environment temperature;
Figure 12 is the variation relation curve map of hydrogen-sensitive element resistance value and ambient humidity.
Description of symbols in figure: STC15F2K60S2-single-chip microcomputer, ADS1256-A/D modular converter, DHT11-temperature and humidity sensing module, CH340-serial communication modular, MAX603 and MAX604-Voltage stabilizing module, S1-reset button.
Embodiment
Below in conjunction with accompanying drawing, the utility model embodiment is described further:
Accompanying drawing 1 is the structure principle chart of the utility model embodiment Hydrogen Concentration Detector, comprises hydrogen gas concentration sensor, data sampling and treatment circuit, sound and light alarm, concentration shows and host computer communication interface.Wherein: data sampling and treatment circuit comprise: A/D change-over circuit, the signal input part (36 pin) of single-chip microcomputer STC15F2K60S2 is sent to after being converted to digital signal for the simulating signal of the density of hydrogen detected by hydrogen gas concentration sensor, be connected with single-chip microcomputer input signal, also has temperature sensor, humidity sensor, single-chip microcomputer goes out hydrogen gas sensor real time resistance value according to input voltage value and precision resistance computing the resistor value, again according to resistance---density of hydrogen proportionate relationship, density of hydrogen data are presented in LCDs, when density of hydrogen is greater than limit value, single chip machine controlling circuit starts acoustic-optic alarm and sends alerting signal.Humiture collection circuit is the temperature and humidity utilizing temperature sensor and humidity sensor to detect test environment in real time, again detection data are sent to single chip machine controlling circuit, described single chip machine controlling circuit, according to real time humiture data and hydrogen gas sensor real time resistance value corresponding relation, calculates actual hydrogen concentration value.
The utility model Hydrogen Concentration Detector technical scheme is the Hydrogen Concentration Detector based on the hydrogen-sensitive element disclosed in patent of invention CN102180518B, as shown in Figure 1, Hydrogen Concentration Detector comprises hydrogen gas sensor and bleeder circuit, noise reduction filtering circuit, A/D change-over circuit, single-chip microcomputer and control circuit, liquid crystal display circuit, warning circuit, humiture collection circuit, serial communication circuit, also has clock circuit (not drawing in Fig. 1).Hydrogen gas sensor is the hydrogen-sensitive element disclosed in patent of invention CN102180518B, A/D change-over circuit, liquid crystal display circuit, warning circuit, clock circuit and serial communication circuit are all known Modularized digital circuit, as shown in Figure 4, A/D change-over circuit comprises ADS1256 module, as shown in Figure 7, humiture collection circuit comprises Temperature Humidity Sensor DHT11 module; Testing result, for communicating with host computer, is transferred to host computer and files and data analysis by described serial communication circuit (Fig. 8).
In the utility model embodiment, density of hydrogen signals collecting input circuit is the bleeder circuit that two-way is identical, this No. two bleeder circuit forms one main one of single-chip microcomputer for two-way density of hydrogen signals collecting input end MOSI and MISO, and when namely wherein a road works, another road is for subsequent use.For the bleeder circuit of first shown in Fig. 2, hydrogen-sensitive element R21 and precision resistance R17 in figure, one end ground connection of hydrogen-sensitive element R21, the other end is connected to 5V positive source after connecting with precision resistance R17 again, the other end of hydrogen-sensitive element R21 is also connected with noise reduction filtering circuit (shown in Fig. 3) input pickup resistance R27, the other end of the hydrogen-sensitive element R22 of another bleeder circuit is connected with the input pickup resistance R33 of another noise reduction filtering circuit (shown in Fig. 3), two noise reduction filtering circuit output end AIN1 and AIN2 are connected respectively to signal input part the 7th pin and the 8th pin (Fig. 4) of the ADS1256 module of A/D change-over circuit, after A/D change-over circuit converts analog voltage signal to digital signal, single-chip microcomputer and control circuit signal input part (the 36th pin and the 37th pin) is exported respectively to by the 22nd pin and 23 pin, single-chip microcomputer goes out the real time resistance intermediate value of the quick resistance of hydrogen according to input voltage value and precision resistance computing the resistor value, meanwhile, humiture collection circuit (Fig. 7) detects the temperature and humidity of test environment in real time by Temperature Humidity Sensor, then detection data is sent to single-chip microcomputer (the 3rd pin).
Single-chip microcomputer and control circuit are according to real time humiture data and hydrogen quick resistance real time resistance value corresponding relation, the real time resistance intermediate value of the quick resistance of described hydrogen is revised, last again according to resistance---density of hydrogen data are sent on the display screen of liquid crystal display circuit by density of hydrogen proportionate relationship; When density of hydrogen is greater than limit value, single-chip microcomputer and control circuit start acoustic-optic alarm and send alerting signal.
See Fig. 3, for first noise reduction filtering circuit, first resistance R27 is signal input part, first resistance R27 connects with the second resistance R28, second resistance R28 is signal output part, one end of first electric capacity C26 and the second electric capacity C27 is connected across the two ends of the second resistance R28 respectively, the other end ground connection of the first electric capacity C26 and the second electric capacity C27.
Single-chip microcomputer and control circuit comprise feed circuit (Fig. 9), model is STC15F2K60S2 single-chip microcomputer (Fig. 5), reset circuit (6); Described feed circuit comprise MAX603, MAX604 module, for being standard direct current 3.3V and 5V power supply by electric battery or external direct current power supply voltage stabilizing; Described reset circuit comprises reset switch S1, resistance R2 and R3, electric capacity C4, described reset switch S1 is connected with 5V power supply with one end of electric capacity C4, the other end of reset switch S1 is connected with resistance R2, the other end of resistance R2 is connected with one end of the other end of electric capacity C4 and resistance R3, the other end ground connection of resistance R3, one end of resistance R3 is connected to single-chip microcomputer the 13rd pin.
See Fig. 5 and Fig. 8, signal output part the 22nd pin that the 18th pin of single-chip microcomputer STC15F2K60S2 and the 19th pin are connected to signal input part RXD and TXD of serial communication circuit respectively, the 36th pin connects A/D change-over circuit.
The hydrogen gas sensor that the utility model is quoted is semiconductor pentoxide nanowire by use hydrogen-sensitive element, as can be seen from accompanying drawing 10, the resistance value of hydrogen gas sensor and the concentration of tested Hydrogen in Air are inversely proportional to, precision resistance in this hydrogen-sensitive element and the utility model embodiment is contacted, hydrogen-sensitive element two ends and an exportable voltage signal changed along with density of hydrogen change, this voltage signal, just can export a digital signal through A/D change-over circuit.Consider the impact of hydrogen-sensitive element resistance value by the temperature and humidity of air simultaneously, so add Temperature Humidity Sensor, for measuring the temperature and humidity in air, because the temperature humidity of the resistance value of hydrogen gas concentration sensor and density of hydrogen, air has fixing relation, these data exist in single-chip microcomputer in advance, and the signal constantly collected and normal data contrast and just can judge whether to exceed safety standard.Consider the impact of other gas in air, so require that hydrogen gas concentration sensor is only to hydrogen sensitive simultaneously.
Single-chip microcomputer treatment circuit shown in Fig. 5 adopts High Performance SCM STC15F2K60S2, the SRAM of Large Copacity 2048 byte, EEPROM in Large Copacity sheet in sheet.The signal of A/D conversion is by 36 pin of single-chip microcomputer and 37 pin input single-chip microcomputer, and 35 pin of single-chip microcomputer are connected with warning circuit after filter capacitor through resistance, once density of hydrogen exceedes setting value will start warning.
Fig. 9 is supply module circuit diagram, employ MAX603 and MAX604 two kinds of linear voltage regulator modules, it has fixing output (5V or 3.3V) or adjustable output two kinds of patterns, regulating resistance value between out and set bipod just can the size of regulation output voltage, be that different components is powered with MAX603 and MAX604 in the present embodiment.
Fig. 8 is the utility model embodiment Hydrogen Concentration Detector and upper communication serial port circuit, for the data upload that collected by Hydrogen Concentration Detector in host computer.
Figure 10 is the graph of relation of hydrogen-sensitive element resistance value and density of hydrogen, and as seen from Figure 10, shown curve resistance value is when more than 100ppm, and hydrogen-sensitive element resistance value becomes good linear relationship with density of hydrogen.
Figure 11 is the variation relation curve map of hydrogen-sensitive element resistance value and environment temperature, and as seen from Figure 11, hydrogen-sensitive element resistance value when not passing into hydrogen at room temperature has approximate linear relationship.
Figure 12 is the variation relation curve map of hydrogen-sensitive element resistance value and ambient humidity, can be seen also by Figure 12, hydrogen-sensitive element is not passing in hydrogen situation, and ambient humidity in 30% ~ 60% humidity range time, the humidity of hydrogen-sensitive element resistance value and environment is similar to linear relationship.
Because the resistance value of hydrogen gas concentration sensor and density of hydrogen, environment temperature, ambient humidity have corresponding relation, when the temperature and humidity of known environment, compare by measured value and standard value the density of hydrogen just can known in environment.
Utilize the utility model embodiment Hydrogen Concentration Detector, precision during actual measurement can reach ± 4%FS.
These are only inventive embodiment, but be not limited to the utility model, all make within spirit of the present utility model and principle any amendment, equivalent to replace or improvement etc., all should be included within right of the present utility model.
Claims (4)
1. a Hydrogen Concentration Detector, comprises hydrogen-sensitive element and bleeder circuit, noise reduction filtering circuit, A/D change-over circuit, single-chip microcomputer and control circuit, liquid crystal display circuit, warning circuit, humiture collection circuit, clock circuit and serial communication circuit; Described hydrogen-sensitive element comprises: the pentoxide nanowire by use film prepared by thermal oxidation method large area is as sensitive material, described sensitive material is stamped the electrode pattern mask plate made in advance, the preparation of described nano wire mould upper surface both sides has rectangle or circular point shape Pt electrode, described Pt electrode also has the copper conductor of drawing; Described A/D change-over circuit comprises ADS1256 module, described humiture collection circuit comprises Temperature Humidity Sensor DHT11 module, described serial communication circuit comprises CH340 module, and serial communication circuit is used for communicating with host computer, testing result is transferred to host computer and files and data analysis; Described clock circuit comprises the standard clock circuit module be connected with single-chip microcomputer, and described liquid crystal display circuit comprises the LCDs be connected with single-chip microcomputer, and described warning circuit comprises the sound and light alarm module be connected with single-chip microcomputer; It is characterized in that:
Described hydrogen-sensitive element and bleeder circuit are density of hydrogen signals collecting input circuits, described bleeder circuit comprises hydrogen-sensitive element and precision resistance, one end ground connection of hydrogen-sensitive element, the other end is connected to positive source after connecting with precision resistance again, the other end of hydrogen-sensitive element is also connected with described noise reduction filtering circuit input end, noise reduction filtering circuit output end is connected to signal input part the 7th pin of the ADS1256 module of A/D change-over circuit, A/D change-over circuit exports single-chip microcomputer and control circuit signal input part to after converting analog voltage signal to digital signal, described single-chip microcomputer goes out the real time resistance intermediate value of the quick resistance of hydrogen according to input voltage value and precision resistance computing the resistor value, meanwhile, described humiture collection circuit detects the temperature and humidity of test environment in real time by Temperature Humidity Sensor, then detection data are sent to single-chip microcomputer and control circuit,
Single-chip microcomputer and control circuit are according to real time humiture data and hydrogen quick resistance real time resistance value corresponding relation, the real time resistance intermediate value of the quick resistance of described hydrogen is revised, last again according to resistance---density of hydrogen data are sent on the display screen of liquid crystal display circuit by density of hydrogen proportionate relationship; When density of hydrogen is greater than limit value, single-chip microcomputer and control circuit start acoustic-optic alarm and send alerting signal.
2. a kind of Hydrogen Concentration Detector as claimed in claim 1, it is characterized in that: described noise reduction filtering circuit comprises the first resistance and the second resistance, the first electric capacity and the second electric capacity, first resistance is signal input part, first resistance and the second resistant series, second resistance is signal output part, and one end of the first electric capacity and the second electric capacity is connected across the two ends of the second resistance, other end ground connection respectively.
3. a kind of Hydrogen Concentration Detector as claimed in claim 1, is characterized in that: described single-chip microcomputer and control circuit comprise feed circuit, model is STC15F2K60S2 single-chip microcomputer, reset circuit; Described feed circuit comprise MAX603, MAX604 module, for being standard direct current 3.3V and 5V power supply by electric battery or external direct current power supply voltage stabilizing; Described reset circuit comprises reset switch S1, resistance R2 and R3, electric capacity C4, described reset switch S1 is connected with 5V power supply with one end of electric capacity C4, the other end of reset switch S1 is connected with resistance R2, the other end of resistance R2 is connected with one end of the other end of electric capacity C4 and resistance R3, the other end ground connection of resistance R3, one end of resistance R3 is connected to single-chip microcomputer the 13rd pin;
Signal output part the 22nd pin that the 3rd pin access Temperature Humidity Sensor DHT11 module output signal of described single-chip microcomputer STC15F2K60S2, the 18th pin and the 19th pin are connected to signal input part RXD and TXD of serial communication circuit respectively, the 36th pin connects A/D change-over circuit.
4. a kind of Hydrogen Concentration Detector as claimed in claim 1, is characterized in that: have identical two-way density of hydrogen signals collecting input circuit, forms one main one of single-chip microcomputer for two-way density of hydrogen signals collecting input end MOSI and MISO; The noise reduction filtering circuit that each road density of hydrogen signals collecting input circuit includes hydrogen-sensitive element and bleeder circuit and is connected with bleeder circuit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520527034.6U CN204903445U (en) | 2015-07-20 | 2015-07-20 | Hydrogen concentration detector |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520527034.6U CN204903445U (en) | 2015-07-20 | 2015-07-20 | Hydrogen concentration detector |
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| CN204903445U true CN204903445U (en) | 2015-12-23 |
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| CN201520527034.6U Expired - Fee Related CN204903445U (en) | 2015-07-20 | 2015-07-20 | Hydrogen concentration detector |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104965009A (en) * | 2015-07-20 | 2015-10-07 | 湖北大学 | Hydrogen concentration detector |
| CN113514503A (en) * | 2020-04-10 | 2021-10-19 | 中国石油化工股份有限公司 | Gas sensing system and gas sensor |
-
2015
- 2015-07-20 CN CN201520527034.6U patent/CN204903445U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104965009A (en) * | 2015-07-20 | 2015-10-07 | 湖北大学 | Hydrogen concentration detector |
| CN104965009B (en) * | 2015-07-20 | 2018-04-27 | 湖北大学 | A kind of Hydrogen Concentration Detector |
| CN113514503A (en) * | 2020-04-10 | 2021-10-19 | 中国石油化工股份有限公司 | Gas sensing system and gas sensor |
| CN113514503B (en) * | 2020-04-10 | 2023-09-12 | 中国石油化工股份有限公司 | Gas sensing system and gas sensor |
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