Wide-range gas detector detection system and method based on temperature and humidity

Abstract

The invention relates to the technical field of environment detection equipment, in particular to a wide-range gas detector detection system and method based on temperature and humidity, and the system comprises a sampling module, an acquisition module, a cooperative control module, a compensation module, a reaction module and an alarm module, determining the detection sensitivity according to the reaction current and the gas concentration value so as to determine a sensitivity drift factor, and adjusting the thermal dynamic factor and the tidal dynamic factor according to the sensitivity drift factor; and the compensation module is used for determining a temperature compensation value according to the gas temperature data, the thermal dynamic factor and a preset ideal temperature, determining a humidity compensation value according to the gas humidity data, the moisture dynamic factor and a preset ideal humidity, and performing temperature and humidity compensation on the gas according to the temperature compensation value and the humidity compensation value. The gas concentration detection precision of the gas detector is effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of environmental detection equipment, and in particular to a wide-range gas detector detection system based on temperature and humidity. Background Art

[0002] A gas detector is an instrument tool used to detect specific gas components and their concentrations in the environment. It mainly uses gas sensors to detect the types and contents of gases in the environment. It can be applied to many fields such as meteorological detection and environmental quality detection.

[0003] According to the detection principle, gas detectors can be divided into the following categories: 1) Electrochemical gas detectors, which use electrochemical principles to detect gas concentration by measuring the redox reaction of gas on the electrode; 2) Semiconductor gas detectors, which use the physical properties of semiconductor materials to detect gas concentration by measuring the adsorption reaction of gas on the surface of semiconductor materials. 3) Catalytic combustion gas detectors, which use the oxidation reaction of combustible gas on the surface of the catalyst to generate heat to increase the temperature of the sensor, thereby causing the resistance value to change and determine the concentration of the combustible gas. 4) Thermal conductivity gas detectors, which use the thermal conductivity principle to detect gas concentration by measuring the effect of changes in thermal conduction on the sensor; 5) Optical gas detectors, which use optical principles to detect gas concentration by measuring the degree of absorption or scattering of a specific light beam by the gas.

[0004] The prior art discloses a temperature and humidity data drift compensation circuit and a gas detector. The compensation circuit includes a temperature / humidity sensor circuit, a gas sensor circuit, a DSP data processing circuit and an output and display circuit. The DSP data processing circuit will compensate the temperature of the gas sensor according to different temperature changes in the environment. When the temperature is high, the electrochemical characteristics of the sensor are relatively active, and its compensation amplitude is relatively low. When the temperature is low, the electrochemical characteristics of the sensor are relatively slow, and its compensation amplitude is relatively high, ultimately achieving the purpose of not affecting the measurement accuracy due to changes in ambient temperature.

[0005] It can be seen that the above technical solution simply divides the compensation range according to the temperature when performing temperature compensation. This simple high and low temperature dichotomy compensation may result in over-compensation or under-compensation in the intermediate temperature transition range, and cannot accurately maintain the stability of measurement accuracy. At the same time, the influence of other factors such as ambient humidity on the accuracy of gas concentration detection is not considered. Summary of the invention

[0006] To this end, the present invention provides a wide range gas detector detection system based on temperature and humidity to overcome the problem of low gas concentration detection accuracy of the gas detector due to the imperfect temperature and humidity compensation mechanism in the prior art.

[0007] To achieve the above object, the present invention provides a wide range gas detector detection system based on temperature and humidity, comprising:

[0008] A sampling module, which is used to collect gas samples in the environment;

[0009] A collection module, which is connected to the sampling module and is used to collect ambient temperature data and ambient humidity data, collect gas temperature data and gas humidity data of the gas sample, and also to collect reaction current and gas concentration values ​​after gas detection at several positions;

[0010] A co-control module, which is connected to the acquisition module, and is used to determine the temperature compensation timing and the humidity compensation timing according to the gas temperature data and the gas humidity data, respectively, determine the detection sensitivity according to the reaction current and the gas concentration value to determine the sensitivity drift factor, and adjust the thermal factor and the tidal factor according to the sensitivity drift factor;

[0011] The thermal factor is a parameter of the degree of influence of the ambient temperature on the gas temperature, and the tidal factor is a parameter of the degree of influence of the ambient humidity on the gas humidity;

[0012] A compensation module, which is connected to the acquisition module and the cooperative control module respectively, and is used to determine a temperature compensation value according to the gas temperature data, the thermal dynamic factor and the preset ideal temperature, determine a humidity compensation value according to the gas humidity data, the tidal dynamic factor and the preset ideal humidity, and perform temperature and humidity compensation on the gas according to the temperature compensation value and the humidity compensation value;

[0013] A reaction module, which is connected to the compensation module and the collection module respectively, and is used to receive the gas sample after temperature and humidity compensation, so that the gas sample is mixed with the reaction reagent to generate an electrochemical reaction and generate a reaction current;

[0014] Wherein, the reaction module is provided with a signal processing unit, which is used to determine the gas concentration value according to the reaction current;

[0015] An alarm module is connected to the acquisition module and is used to determine whether to alarm according to the gas concentration value.

[0016] As a preferred technical solution for the wide-range gas detector detection system based on temperature and humidity, the cooperative control module includes a temperature cooperative control unit and a humidity cooperative control unit;

[0017] The temperature cooperative control unit determines the degree of temperature deviation according to the gas temperature data and the preset ideal temperature to determine the timing of temperature compensation;

[0018] The humidity cooperative control unit determines the humidity deviation degree according to the gas humidity data and the preset ideal humidity to determine the humidity compensation timing.

[0019] As a preferred technical solution for the wide-range gas detector detection system based on temperature and humidity, during a single gas detection process, the compensation module determines the temperature compensation value according to the temperature offset degree and the thermal dynamic factor;

[0020] The compensation module determines a temperature relationship model between the ambient temperature and the gas temperature according to the historical gas temperature data and the historical ambient temperature data, and determines the thermal dynamic factor according to the temperature relationship model.

[0021] As a preferred technical solution for the wide-range gas detector detection system based on temperature and humidity, during a single gas detection process, the compensation module determines the humidity compensation value according to the humidity offset degree and the tidal factor;

[0022] The compensation module determines a humidity relationship model between ambient humidity and gas humidity according to historical gas humidity data and historical ambient humidity data, and determines a tidal factor according to the humidity relationship model.

[0023] As a preferred technical solution for a wide-range gas detector detection system based on temperature and humidity, the cooperative control module determines a single sensitivity based on the reaction current and gas concentration value at a single location, and determines the detection sensitivity based on the single sensitivity of each location.

[0024] As a preferred technical solution for the wide-range gas detector detection system based on temperature and humidity, the cooperative control module determines the sensitivity drift factor according to the detection sensitivity and the preset sensitivity.

[0025] As an optimal technical solution for the wide-range gas detector detection system based on temperature and humidity, the cooperative control module performs temperature and humidity compensation on the gas according to the temperature compensation timing and humidity compensation timing respectively, and adjusts the thermal factor and tidal factor according to the sensitivity drift factor.

[0026] As a preferred technical solution for the wide-range gas detector detection system based on temperature and humidity, the cooperative control module determines the adjustment method of the thermal dynamic factor according to the size of the sensitivity drift factor, wherein:

[0027] If the sensitivity drift factor is greater than a preset first threshold, reducing the thermal dynamic factor;

[0028] If the sensitivity drift factor is less than a preset first threshold, the thermal factor is increased.

[0029] As a preferred technical solution for the wide-range gas detector detection system based on temperature and humidity, the cooperative control module determines the adjustment method of the tidal factor according to the size of the sensitivity drift factor, wherein:

[0030] If the sensitivity drift factor is greater than a preset second threshold, reducing the tidal factor;

[0031] If the sensitivity drift factor is less than a preset second threshold, the tidal factor is increased.

[0032] As a preferred technical solution for the wide-range gas detector detection system based on temperature and humidity, the alarm module determines whether to alarm based on the comparison result between the gas concentration value and the preset concentration threshold, wherein:

[0033] If the gas concentration value is greater than a preset concentration threshold, the alarm module is determined to alarm;

[0034] Wherein, the preset concentration threshold is determined according to the gas type of the gas sample.

[0035] Compared with the prior art, the beneficial effect of the present invention lies in that, in the above-mentioned embodiments, the present invention realizes the accurate collection and temperature and humidity compensation of environmental gas samples by integrating sampling, collection, coordinated control, compensation, reaction and alarm modules, effectively improves the sensitivity and accuracy of gas detection, and can dynamically adjust the thermal factor and tidal factor according to the drift of detection sensitivity, further ensure the stability and reliability of gas concentration detection results, and timely alarm when the gas concentration exceeds the preset threshold, providing strong technical guarantee for environmental safety monitoring.

[0036] In particular, the present invention determines the temperature compensation timing and the humidity compensation timing according to the gas temperature data, the gas humidity data, the preset ideal temperature and the preset ideal humidity to perform temperature and humidity compensation, further ensuring the stability and reliability of the gas concentration detection results, and promptly alarming when the gas concentration exceeds the preset threshold, providing strong technical guarantee for environmental safety monitoring.

[0037] In particular, during a single gas detection process, the present invention determines the temperature compensation value based on the degree of temperature offset and the thermal factor, and determines the thermal factor in combination with historical gas temperature data and historical ambient temperature data, thereby further ensuring the stability and reliability of the gas concentration detection results, and promptly issues an alarm when the gas concentration exceeds a preset threshold, thereby providing strong technical support for environmental safety monitoring.

[0038] In particular, during a single gas detection process, the present invention determines the humidity compensation value based on the humidity deviation degree and the tidal factor, and determines the tidal factor in combination with historical gas humidity data and historical environmental humidity data, thereby further ensuring the stability and reliability of the gas concentration detection results, and promptly issues an alarm when the gas concentration exceeds a preset threshold, thereby providing strong technical support for environmental safety monitoring.

[0039] In particular, the present invention determines a single sensitivity based on the reaction current and gas concentration value at a single position, determines the detection sensitivity and the sensitivity drift factor based on the single sensitivities at several positions, determines the adjustment method of the thermal factor and the tidal factor according to the size of the sensitivity drift factor, further ensures the stability and reliability of the gas concentration detection results, and provides a strong technical guarantee for environmental safety monitoring. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a structural block diagram of a wide range gas detector detection system based on temperature and humidity according to an embodiment of the present invention;

[0041] Figure 2 A step diagram for determining the timing of temperature and humidity compensation according to an embodiment of the present invention;

[0042] Figure 3 A determination diagram for determining a thermodynamic factor adjustment method according to an embodiment of the present invention;

[0043] Figure 4 A decision diagram for determining a tidal factor adjustment method according to an embodiment of the present invention. DETAILED DESCRIPTION

[0044] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0045] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0046] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0047] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] See also Figure 1 , Figure 2 As shown, Figure 1 It is a structural block diagram of a wide range gas detector detection system based on temperature and humidity according to an embodiment of the present invention; Figure 2 The present invention provides a wide range gas detector detection system based on temperature and humidity, including:

[0049] A sampling module, which is used to collect gas samples in the environment;

[0050] A collection module, which is connected to the sampling module and is used to collect ambient temperature data and ambient humidity data, collect gas temperature data and gas humidity data of the gas sample, and also to collect reaction current and gas concentration values ​​after gas detection at several positions;

[0051] A co-control module, which is connected to the acquisition module, and is used to determine the temperature compensation timing and the humidity compensation timing according to the gas temperature data and the gas humidity data, respectively, determine the detection sensitivity according to the reaction current and the gas concentration value to determine the sensitivity drift factor, and adjust the thermal factor and the tidal factor according to the sensitivity drift factor;

[0052] The thermal factor is a parameter of the degree of influence of the ambient temperature on the gas temperature, and the tidal factor is a parameter of the degree of influence of the ambient humidity on the gas humidity;

[0053] A compensation module, which is connected to the acquisition module and the cooperative control module respectively, and is used to determine a temperature compensation value according to the gas temperature data, the thermal dynamic factor and the preset ideal temperature, determine a humidity compensation value according to the gas humidity data, the tidal dynamic factor and the preset ideal humidity, and perform temperature and humidity compensation on the gas according to the temperature compensation value and the humidity compensation value;

[0054] A reaction module, which is connected to the compensation module and the collection module respectively, and is used to receive the gas sample after temperature and humidity compensation, so that the gas sample is mixed with the reaction reagent to generate an electrochemical reaction and generate a reaction current;

[0055] Wherein, the reaction module is provided with a signal processing unit, which is used to determine the gas concentration value according to the reaction current;

[0056] An alarm module is connected to the acquisition module and is used to determine whether to alarm according to the gas concentration value.

[0057] In detail, the electrochemical gas detector uses the electrochemical principle to detect the gas concentration by measuring the redox reaction of the gas on the electrode. The sensor usually contains two electrodes (working electrode and counter electrode), and the electrodes are immersed in an electrolyte solution. When the target gas enters the sensor through the diffusion membrane, it reacts with the electrolyte to generate a current. The magnitude of the current is proportional to the concentration of the target gas. The concentration of the gas can be determined by measuring the current. The ambient temperature and humidity are different in different detection environments. The ambient temperature and humidity will affect the temperature and humidity of the gas, and then affect the reaction rate of the gas electrode, which will affect the gas concentration detection results. Therefore, by determining the temperature and humidity compensation timing, temperature compensation value and humidity compensation value to correct the gas temperature and humidity, the true concentration of the gas can be restored to the greatest extent, the gas concentration detection accuracy of the gas detector can be improved, and the sensitivity reduction caused by environmental interference can be reduced.

[0058] In detail, both the thermal factor and the tidal factor are parameters that characterize the degree of influence of the environment on the gas. The thermal factor is intended to describe a correlation between the ambient temperature and the gas temperature, providing a basis for subsequent temperature compensation and other operations. The tidal factor is intended to describe a correlation between the ambient humidity and the gas humidity, providing a basis for subsequent humidity compensation and other operations. The compensation module determines the temperature compensation value based on the gas temperature data, the thermal factor and the preset ideal temperature, and determines the humidity compensation value based on the gas humidity data, the tidal factor and the preset ideal humidity, so as to compensate the gas for temperature and humidity.

[0059] In detail, the preset ideal temperature and the preset ideal humidity are the ideal temperature and humidity for the reaction between the gas and the electrolyte, and the gas concentration value output is accurate under the preset ideal temperature and the preset ideal humidity. The preset concentration threshold is a dynamic gas concentration standard value preset in the gas detector, which is used to define whether the gas concentration in the gas detection area reaches a dangerous level or a level that requires attention.

[0060] In implementation, it is necessary to collect the reaction current and gas concentration values ​​after gas detection at several positions. The several positions are positions in the gas detection area. The gas detection area can be divided into several parts using a preset segmentation method, and the relevant data of the center position of the divided area can be collected. The preset segmentation method can be to divide the gas detection area into squares of a preset size, and the value range of the preset size of the square is 0.8m~1m. Preferably, the value of the preset size of the square is 0.9m. The preset segmentation method can also choose to divide the gas detection area into rectangles, etc., which is not specifically limited here. The value range of the preset ideal temperature is 18℃~32℃, preferably, the value of the preset ideal temperature is 25℃; the value range of the preset ideal humidity is 38%RH-62%RH, preferably, the value of the preset ideal humidity is 50%RH.

[0061] In the above embodiments, the present invention realizes accurate collection and temperature and humidity compensation of environmental gas samples by integrating sampling, collection, coordinated control, compensation, reaction and alarm modules, effectively improving the sensitivity and accuracy of gas detection. At the same time, it can dynamically adjust the thermal factor and tidal factor according to the drift of detection sensitivity, further ensuring the stability and reliability of gas concentration detection results, and timely alarming when the gas concentration exceeds the preset threshold, providing strong technical guarantee for environmental safety monitoring.

[0062] Specifically, the cooperative control module includes a temperature cooperative control unit and a humidity cooperative control unit;

[0063] The temperature cooperative control unit determines the degree of temperature deviation according to the gas temperature data and the preset ideal temperature to determine the timing of temperature compensation;

[0064] The humidity cooperative control unit determines the humidity deviation degree according to the gas humidity data and the preset ideal humidity to determine the humidity compensation timing.

[0065] In detail, the temperature and humidity of the gas are compensated by determining the temperature compensation timing and the humidity compensation timing, thereby avoiding the influence of the environment on the gas concentration detection result.

[0066] Specifically, the temperature cooperative control unit determines the temperature offset degree according to the gas temperature data and the preset ideal temperature, and determines the temperature compensation timing according to the temperature offset degree and the preset first offset degree.

[0067] Specifically, the humidity cooperative control unit determines the humidity deviation degree according to the gas humidity data and a preset ideal humidity, and determines the humidity compensation timing according to the humidity deviation degree and a preset second deviation degree.

[0068] In implementation, the temperature offset degree is the difference between the gas temperature data and the preset ideal temperature, that is, the temperature offset degree = gas temperature data - preset ideal temperature, and the humidity offset degree is the difference between the gas humidity data and the preset ideal humidity.

[0069] In implementation, the timing of temperature compensation is determined according to the temperature offset degree and the preset first offset degree, including: if the temperature offset degree is less than or equal to the preset first offset degree, no temperature compensation is performed; if the temperature offset degree is greater than the preset first offset degree, temperature compensation is performed. The value range of the preset first offset degree is 0°C to 4°C, preferably, the value of the preset first offset degree is 2°C;

[0070] In implementation, the humidity compensation timing is determined according to the humidity offset degree and the preset second offset degree, including: if the humidity offset degree is less than or equal to the preset second offset degree, no humidity compensation is performed; if the humidity offset degree is greater than the preset second offset degree, humidity compensation is performed. The preset second offset degree has a value range of 0%RH to 3%RH, and preferably, the preset first offset degree has a value of 2%RH.

[0071] On the basis of the above effects, the present invention determines the temperature compensation timing and humidity compensation timing according to the gas temperature data, gas humidity data, preset ideal temperature and preset ideal humidity to perform temperature and humidity compensation, further ensure the stability and reliability of the gas concentration detection results, and promptly alarm when the gas concentration exceeds the preset threshold, providing strong technical guarantee for environmental safety monitoring.

[0072] Specifically, during a single gas detection process, the compensation module determines a temperature compensation value according to the temperature offset degree and the thermal dynamic factor;

[0073] The compensation module determines a temperature relationship model between the ambient temperature and the gas temperature according to the historical gas temperature data and the historical ambient temperature data, and determines the thermal dynamic factor according to the temperature relationship model.

[0074] In detail, the thermal dynamic factor is a parameter of the degree of influence of the ambient temperature on the gas temperature. When the ambient temperature is higher than the gas temperature, the heat in the environment will be transferred to the gas sample, causing the gas temperature to rise. Similarly, when the ambient temperature is lower than the gas temperature, the gas will dissipate heat to the surrounding environment, causing the gas temperature to drop. Therefore, the temperature compensation value is determined according to the degree of temperature offset and the thermal dynamic factor, and temperature compensation is performed. The thermal dynamic factor is determined based on historical gas temperature data and historical ambient temperature data. The historical gas temperature data and historical ambient temperature data are data measured at different time points in the same detection environment.

[0075] In implementation, the compensation module includes a temperature compensation component, a first compensation calculation component, a humidity compensation component, and a second compensation calculation component; the temperature compensation value and the humidity compensation value are determined according to the first compensation calculation component and the second compensation component respectively to adjust the temperature and humidity of the gas entering the gas detector. The temperature compensation component includes a heater and a cooler, the heater is used to increase the gas temperature, and the cooler is used to reduce the gas temperature. The humidity compensation component includes a dehumidifier and a humidifier, the dehumidifier can remove moisture from the gas by condensation or adsorption, and the humidifier is used to increase the moisture content in the gas. The temperature compensation value is the product of the temperature offset degree and the thermal dynamic factor. When the temperature offset degree is positive, the temperature of the gas entering the gas detector is reduced, and when the temperature offset degree is negative, the temperature of the gas entering the gas detector is increased (when the gas detector performs gas detection, the gas will enter the gas detector, and the temperature of the gas entering the gas detector is adjusted).

[0076] In implementation, historical gas temperature data and historical ambient temperature data at different locations in the same detection area at the same time can be collected, and a temperature relationship model between the gas temperature and the ambient temperature can be constructed. It can be understood that the gas temperature rises as the ambient temperature rises; wherein the ambient temperature is defined as the independent variable T b , gas temperature is defined as the dependent variable T a , use mathematical software (such as Matlab, Origin, etc.) to fit the data, and determine the temperature relationship model that best describes the relationship between ambient temperature and gas temperature by comparing the goodness of fit of different fitting functions (such as can be judged based on the determination coefficient, the closer to 1 the better the fitting effect), in the temperature relationship model, the coefficient related to the independent variable is recorded as the thermodynamic factor at the ambient temperature, and the constant term is the baseline level of the temperature relationship model (that is, the difference between the gas temperature and the thermodynamic factor when the ambient temperature is 0).

[0077] On the basis of the above effects, during a single gas detection process, the present invention determines the temperature compensation value according to the degree of temperature offset and the thermal factor, and determines the thermal factor in combination with historical gas temperature data and historical ambient temperature data, thereby further ensuring the stability and reliability of the gas concentration detection results, and promptly issues an alarm when the gas concentration exceeds a preset threshold, providing strong technical support for environmental safety monitoring.

[0078] Specifically, during a single gas detection process, the compensation module determines a humidity compensation value according to the humidity offset degree and the tidal factor;

[0079] The compensation module determines a humidity relationship model between ambient humidity and gas humidity according to historical gas humidity data and historical ambient humidity data, and determines a tidal factor according to the humidity relationship model.

[0080] In detail, the tidal factor is a parameter that indicates the degree of influence of ambient humidity on gas humidity. When the ambient humidity is high, moisture may enter the detector and affect the electrode reaction. When the ambient humidity is low, the electrolyte solution may dry up due to excessive evaporation of moisture, thereby interfering with the detection signal. Therefore, the humidity compensation value is determined based on the degree of humidity deviation and the tidal factor. The tidal factor is determined based on historical gas humidity data and historical ambient humidity data. The historical gas humidity data and historical ambient humidity data are data measured at different time points in the same detection environment.

[0081] In implementation, the humidity compensation value is the product of the humidity offset degree and the tidal factor. When the humidity offset degree is positive, the humidity of the gas entering the gas detector is reduced (the gas entering the gas detector is dried). When the humidity offset degree is negative, the humidity of the gas entering the gas detector is increased (the gas entering the gas detector is humidified).

[0082] In implementation, historical gas humidity data and historical ambient humidity data at different locations in the same detection area at the same time can be collected. It can be understood that as the ambient humidity increases, the gas humidity also increases. The ambient humidity is defined as the independent variable R b , gas humidity is defined as the dependent variable R a , use mathematical software (such as Matlab, Origin, etc.) to fit the data, and determine the humidity relationship model that best describes the relationship between ambient humidity and gas humidity by comparing the goodness of fit of different fitting functions (such as can be judged based on the determination coefficient, the closer to 1, the better the fitting effect). In the humidity relationship model, the coefficient related to the independent variable is recorded as the tidal factor under ambient humidity, and the constant term is the baseline level of the humidity relationship model (that is, the difference between gas humidity and tidal factor corresponding to ambient humidity of 0).

[0083] On the basis of the above effects, during a single gas detection process, the present invention determines the humidity compensation value according to the humidity deviation degree and the tidal factor, and determines the tidal factor in combination with the historical gas humidity data and the historical environmental humidity data, thereby further ensuring the stability and reliability of the gas concentration detection results, and promptly issues an alarm when the gas concentration exceeds the preset threshold, providing strong technical support for environmental safety monitoring.

[0084] Specifically, the cooperative control module determines a single sensitivity according to the reaction current and the gas concentration value at a single position, and determines the detection sensitivity according to the single sensitivity at each position.

[0085] In detail, in the working process of many gas detection sensors, there is an intrinsic correlation between the reaction current and the gas concentration. In an electrochemical gas sensor, when the target gas undergoes an oxidation or reduction reaction with the working electrode, a current signal related to the gas concentration is generated. According to Faraday's law, under certain conditions, the amount of electricity generated by the reaction (related to the current) is directly proportional to the amount of substance involved in the reaction (related to the gas concentration). The gas concentration measured at different locations in the monitoring area will be different, so the detection sensitivity is determined based on a single sensitivity at several locations.

[0086] In implementation, a precision algorithm is built into the co-control module, using a linear proportional relationship model, that is, the single sensitivity at a single position is the ratio of the corresponding reaction current at a single position to the corresponding gas concentration value at a single position. The single sensitivity reflects to a certain extent the degree of current change caused by the unit gas concentration change at a single position, that is, the sensor's sensitivity to changes in gas concentration. The detection sensitivity is the comprehensive sensitivity of the gas detector in the entire detection area. The detection sensitivity is the sum average of several single sensitivities.

[0087] See also Figure 3 As shown, it is a determination diagram for determining the adjustment method of the thermal dynamic factor according to an embodiment of the present invention.

[0088] Specifically, a sensitivity drift factor is determined according to the detection sensitivity and the preset sensitivity, the cooperative control module performs temperature and humidity compensation on the gas according to the temperature compensation timing and the humidity compensation timing, and adjusts the thermal factor and the tidal factor according to the sensitivity drift factor.

[0089] In detail, the detection sensitivity of the gas detector can reflect the degree of change in the current generated by the sensor after it comes into contact with the gas. Therefore, the sensitivity drift factor of the gas detector is determined based on the detection sensitivity and the preset sensitivity. The thermal factor and tidal factor are adjusted based on the sensitivity drift factor, so that the gas concentration value re-output after adjustment is more accurate and the detection sensitivity is closer to the preset sensitivity.

[0090] Specifically, the cooperative control module determines the adjustment method of the thermal dynamic factor according to the size of the sensitivity drift factor, wherein:

[0091] If the sensitivity drift factor is greater than a preset first threshold, reducing the thermal dynamic factor;

[0092] If the sensitivity drift factor is less than a preset first threshold, the thermal factor is increased.

[0093] In detail, during the temperature compensation process, the thermal dynamic factor is used to adjust the detection signal to eliminate the influence of temperature changes on the detection results. If the sensitivity of the gas detector is too high, temperature changes may cause a greater deviation in the detection signal. When the temperature rises, the movement speed of the gas molecules increases, which may enhance the detection signal of the instrument. If the sensitivity drift factor is too high, reduce the thermal dynamic factor. By reducing the thermal dynamic factor, the amplification effect of temperature changes on the detection signal is reduced, making the detection result closer to the true value. On the contrary, increase the thermal dynamic factor.

[0094] In implementation, the sensitivity drift factor is the difference between the detection sensitivity and the preset sensitivity. The preset sensitivity of the gas detector can be determined according to the actual detection environment and the gas type. The preset sensitivity is a dynamic value, and the preset sensitivity range is 0.9-5μA / ppm. Preferably, the preset sensitivity is 3μA / ppm; the preset first threshold value is 0.1-0.3μA / ppm, preferably, the preset first threshold value is 0.2μA / ppm. When the sensitivity drift factor is greater than the preset first threshold, the adjusted thermal factor = preset first threshold x original thermal factor ÷ sensitivity drift factor. If the sensitivity drift factor is less than the preset first threshold, the adjusted thermal factor = sensitivity drift factor x original thermal factor ÷ preset first threshold.

[0095] See also Figure 4 As shown, it is a decision diagram for determining the adjustment method of the tidal factor according to an embodiment of the present invention. Specifically, the cooperative control module determines the adjustment method of the tidal factor according to the size of the sensitivity drift factor, wherein:

[0096] If the sensitivity drift factor is greater than a preset second threshold, reducing the tidal factor;

[0097] If the sensitivity drift factor is less than a preset second threshold, the tidal factor is increased.

[0098] In detail, the tidal factor is used to adjust the detection signal to eliminate the influence of humidity changes on the detection results. When the sensitivity drift factor is greater than the preset second threshold, it means that the detector has become more sensitive to the detection of gas concentration, that is, under the same gas environment, the output reaction current or detection signal strength is enhanced compared with the normal situation, then the tidal factor is reduced, otherwise, the tidal factor is increased, so as to avoid the influence of environmental humidity on gas humidity, thereby affecting the detection sensitivity, so that the detection result is closer to the actual situation.

[0099] In implementation, the preset second threshold value ranges from 0.2 to 0.5 μA / ppm. Preferably, the preset second threshold value is 0.4 μA / ppm. When the sensitivity drift factor is greater than the preset second threshold value, the adjusted tidal factor = preset second threshold value x original tidal factor ÷ sensitivity drift factor. If the sensitivity drift factor is less than the preset second threshold value, the adjusted tidal factor = sensitivity drift factor x original tidal factor ÷ preset second threshold value.

[0100] On the basis of the above effects, the present invention determines a single sensitivity according to the reaction current and gas concentration value at a single position, determines the detection sensitivity and the sensitivity drift factor according to the single sensitivities at several positions, and determines the adjustment method of the thermal factor and the tidal factor according to the size of the sensitivity drift factor, thereby further ensuring the stability and reliability of the gas concentration detection results and providing a strong technical guarantee for environmental safety monitoring.

[0101] Specifically, the alarm module determines whether to alarm according to the comparison result between the gas concentration value and the preset concentration threshold value, wherein:

[0102] If the gas concentration value is greater than a preset concentration threshold, the alarm module is determined to alarm;

[0103] Wherein, the preset concentration threshold is determined according to the gas type of the gas sample.

[0104] In detail, in many environmental monitoring scenarios, such as industrial production workshops, mines, laboratories, etc., certain gases will cause harm to human health, equipment safety or environmental safety when they reach a certain concentration. For example, in carbon monoxide detection, when the carbon monoxide concentration in the environment exceeds a certain threshold (such as the maximum allowable concentration in the workplace is 30mg / m3), it may cause poisoning of personnel. The preset concentration threshold is a dynamic gas concentration standard value pre-set in the gas detector, which is used to define whether the gas concentration in the gas detection area reaches a dangerous level or requires attention. By setting the preset concentration threshold, the alarm module can issue an alarm in time to remind personnel to take measures, such as evacuation, ventilation, or wearing protective equipment, so as to ensure personnel safety.

[0105] In implementation, the preset concentration threshold is determined according to the gas type of the gas sample. For example, when hydrogen sulfide (H2S) is detected, the preset concentration threshold has a value range of 4 to 6 ppm. Preferably, the preset concentration threshold has a value of 5 ppm. In implementation, the value range and preferred value of the preset concentration threshold need to be determined according to the actual gas type of the detected gas sample, which is not specifically limited here and will not be elaborated.

[0106] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

[0107] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A wide range gas detector detection system based on temperature and humidity, characterized in that: include: A sampling module, which is used to collect gas samples in the environment; A collection module, which is connected to the sampling module and is used to collect ambient temperature data and ambient humidity data, collect gas temperature data and gas humidity data of the gas sample, and also to collect reaction current and gas concentration values ​​after gas detection at several positions; A co-control module, which is connected to the acquisition module, and is used to determine the temperature compensation timing and the humidity compensation timing according to the gas temperature data and the gas humidity data, respectively, determine the detection sensitivity according to the reaction current and the gas concentration value to determine the sensitivity drift factor, and adjust the thermal factor and the tidal factor according to the sensitivity drift factor; The thermal factor is a parameter of the degree of influence of the ambient temperature on the gas temperature, and the tidal factor is a parameter of the degree of influence of the ambient humidity on the gas humidity; A compensation module, which is connected to the acquisition module and the cooperative control module respectively, and is used to determine a temperature compensation value according to the gas temperature data, a thermodynamic factor and a preset ideal temperature, and to determine a humidity compensation value according to the gas humidity data, a tidal factor and a preset ideal humidity, and to perform temperature and humidity compensation on the gas according to the temperature compensation value and the humidity compensation value; A reaction module, which is connected to the compensation module and the collection module respectively, and is used to receive the gas sample after temperature and humidity compensation, so that the gas sample is mixed with the reaction reagent to generate an electrochemical reaction and generate a reaction current; Wherein, the reaction module is provided with a signal processing unit, which is used to determine the gas concentration value according to the reaction current; An alarm module is connected to the acquisition module and is used to determine whether to alarm according to the gas concentration value.

2. The wide range gas detector detection system based on temperature and humidity according to claim 1 is characterized in that: The cooperative control module includes a temperature cooperative control unit and a humidity cooperative control unit; The temperature cooperative control unit determines the degree of temperature deviation according to the gas temperature data and the preset ideal temperature to determine the timing of temperature compensation; The humidity cooperative control unit determines the humidity deviation degree according to the gas humidity data and the preset ideal humidity to determine the humidity compensation timing.

3. The wide range gas detector detection system based on temperature and humidity according to claim 2 is characterized in that: During a single gas detection process, the compensation module determines a temperature compensation value according to the temperature offset degree and the thermal dynamic factor; The compensation module determines a temperature relationship model between the ambient temperature and the gas temperature according to the historical gas temperature data and the historical ambient temperature data to determine the thermal dynamic factor.

4. The wide range gas detector detection system based on temperature and humidity according to claim 2 is characterized in that: During a single gas detection process, the compensation module determines a humidity compensation value according to the humidity offset degree and the tidal factor; The compensation module determines a humidity relationship model between ambient humidity and gas humidity according to historical gas humidity data and historical ambient humidity data to determine the tidal factor.

5. The wide range gas detector detection system based on temperature and humidity according to claim 1 is characterized in that: The cooperative control module determines a single sensitivity according to the reaction current and the gas concentration value at a single position, and determines the detection sensitivity according to the single sensitivity of each position.

6. The wide range gas detector detection system based on temperature and humidity according to claim 5 is characterized in that: The cooperative control module determines a sensitivity drift factor according to the detection sensitivity and a preset sensitivity.

7. The wide range gas detector detection system based on temperature and humidity according to claim 6 is characterized in that: The cooperative control module performs temperature and humidity compensation on the gas according to the temperature compensation timing and the humidity compensation timing, and adjusts the thermal factor and the tidal factor according to the sensitivity drift factor.

8. The wide range gas detector detection system based on temperature and humidity according to claim 7 is characterized in that: The cooperative control module determines the adjustment method of the thermal dynamic factor according to the size of the sensitivity drift factor, wherein: If the sensitivity drift factor is greater than a preset first threshold, reducing the thermal dynamic factor; If the sensitivity drift factor is less than a preset first threshold, the thermal factor is increased.

9. The wide range gas detector detection system based on temperature and humidity according to claim 8, characterized in that: The cooperative control module determines the adjustment method of the tidal factor according to the size of the sensitivity drift factor, wherein: If the sensitivity drift factor is greater than a preset second threshold, reducing the tidal factor; If the sensitivity drift factor is less than a preset second threshold, the tidal factor is increased.

10. The wide range gas detector detection system based on temperature and humidity according to claim 1, characterized in that: The alarm module determines whether to alarm based on the comparison result between the gas concentration value and the preset concentration threshold, wherein: If the gas concentration value is greater than a preset concentration threshold, the alarm module is determined to alarm; Wherein, the preset concentration threshold is determined according to the gas type of the gas sample.

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