CN113933250B - Gas detection device, gas detection method and computer equipment - Google Patents
Gas detection device, gas detection method and computer equipment Download PDFInfo
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- CN113933250B CN113933250B CN202111106528.3A CN202111106528A CN113933250B CN 113933250 B CN113933250 B CN 113933250B CN 202111106528 A CN202111106528 A CN 202111106528A CN 113933250 B CN113933250 B CN 113933250B
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/1702—Systems in which incident light is modified in accordance with the properties of the material investigated with opto-acoustic detection, e.g. for gases or analysing solids
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/1702—Systems in which incident light is modified in accordance with the properties of the material investigated with opto-acoustic detection, e.g. for gases or analysing solids
- G01N2021/1704—Systems in which incident light is modified in accordance with the properties of the material investigated with opto-acoustic detection, e.g. for gases or analysing solids in gases
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Abstract
The application relates to a gas detection device, a gas detection method and computer equipment, wherein the gas detection device is arranged for a dangerous gas container and comprises a photoacoustic cell, an inert gas container and a dangerous gas detection module, the photoacoustic cell is connected with the dangerous gas container, when the dangerous gas container leaks gas, the dangerous gas leaked by the photoacoustic Chi Chengfang is closed, a first valve of the dangerous gas container is closed, a second valve of the inert gas container is opened, and the dangerous gas in the photoacoustic cell is diluted by the inert gas so as to reduce the concentration of the dangerous gas in the photoacoustic cell until reaching a concentration safety threshold value, so that explosion dangerous accidents are avoided.
Description
Technical Field
The present application relates to the field of gas detection technology, and in particular, to a gas detection apparatus, a gas detection method, and a computer device.
Background
The hydrogen energy is a green, efficient and sustainable novel clean energy source and has wide application in the society of today, such as: new energy automobiles, large transformer stations and the like, however, hydrogen has great danger, the explosion limit of the hydrogen in the air is very wide (the volume fraction is 4-75 percent), and explosion accidents can easily occur when the hydrogen meets open fire. Because hydrogen has the minimum molecular weight and extremely low viscosity, liquid hydrogen and gas hydrogen in the air are easy to diffuse, so that the liquid hydrogen leaks in a non-ventilated environment, and the surrounding air can be diluted rapidly.
The data shows that the volume of liquid hydrogen per unit volume increases 840-fold when vaporized into gaseous hydrogen at normal temperature and pressure, and 21000-fold if mixed gas with the lower explosion limit of 4% is formed with air at the same time. Such mixtures are at risk of explosion once exposed to an open fire, and therefore a means of hydrogen monitoring is highly desirable to reduce the occurrence of hazardous events.
Disclosure of Invention
In view of the foregoing, it is desirable to provide a gas detection method, apparatus, computer device, and storage medium that can improve the accuracy of the hydrogen detection result and reduce the occurrence probability of dangerous events.
A gas detection device for use with a hazardous gas container having a first valve thereon, the detection device comprising:
The photoacoustic cell is connected with the dangerous gas container through the first valve and is used for containing dangerous gas leaked from the dangerous gas container;
an inert gas container having a second valve, connected to the hazardous gas container through the second valve, for storing an inert gas;
And the dangerous gas detection module is used for sending a closing signal to the first valve and sending an opening signal to the second valve when detecting that dangerous gas exists in the photoacoustic cell, so that the inert gas container outputs the inert gas to the photoacoustic cell, and the dangerous gas in the photoacoustic cell is diluted by the inert gas.
In one embodiment, the hazardous gas detection module is further configured to obtain first spectrum data and second spectrum data, and determine that the hazardous gas container leaks the hazardous gas into the photoacoustic cell when the second spectrum data is detected to be different from the first spectrum data;
The first spectrum data is absorption peak spectrum data when the dangerous gas does not exist in the photoacoustic cell, and the second spectrum data is absorption peak spectrum data in the photoacoustic cell when the dangerous gas leaks from the dangerous gas container.
In one embodiment, the apparatus further comprises:
The variable frequency laser is used for providing laser with different frequencies for irradiating mixed gas in the photoacoustic cell, wherein the mixed gas comprises the dangerous gas and the inert gas;
a microphone mounted on the photoacoustic cell for detecting a pressure fluctuation signal;
The lock-in amplifier is connected with the output end of the microphone and is used for converting the pressure fluctuation signal into an optical electric signal;
and the second spectrum acquisition module is used for analyzing the photoelectric signals to obtain second spectrum data.
In one embodiment, the apparatus further comprises:
and the frequency adjusting module is used for adjusting the frequency of the variable frequency laser according to the second spectrum data.
In one embodiment, the apparatus further comprises:
The gas concentration detection module is used for acquiring a plurality of third spectrum data and the second spectrum data and determining the concentration of dangerous gas in the photoacoustic cell according to the comparison result of each third spectrum data and the second spectrum data;
The third spectrum data are spectrum data obtained by spectrum acquisition of a plurality of dangerous gases with different concentrations.
In one embodiment, the gas concentration detection module is further configured to send an exhaust signal to an exhaust valve of the photoacoustic cell when the concentration of the dangerous gas in the photoacoustic cell reaches the concentration safety threshold, so that the photoacoustic cell opens the exhaust valve, and the mixed gas with the concentration reaching the concentration safety threshold is discharged through the exhaust valve.
In one embodiment, the apparatus further comprises:
the temperature and pressure sensor is arranged in the photoacoustic cell and used for acquiring pressure data and temperature data in the photoacoustic cell;
and the diffusion coefficient determining module is used for determining the diffusion coefficient of the mixed gas in the photoacoustic cell according to the pressure data and the temperature data.
In one embodiment, the diffusion coefficient is calculated using the following formula:
Wherein D AB represents the diffusion coefficient of the mixed gas in the photoacoustic cell; t is the temperature within the photoacoustic cell and P Total (S) is the total pressure within the photoacoustic cell; m A、MB is the molecular weight of the dangerous gas and the inert gas respectively; v A、vB represents the molecular diffusion volumes of the hazardous gas and the inert gas, respectively.
A gas detection method applied to a hazardous gas container, the hazardous gas container having a first valve thereon, the detection method comprising:
when the existence of dangerous gas in the photoacoustic cell is detected, a closing signal is sent to a first valve of the dangerous gas container, and an opening signal is sent to a second valve of the inert gas container, so that the inert gas container outputs inert gas to the photoacoustic cell, and the dangerous gas in the photoacoustic cell is diluted by the inert gas;
the photoacoustic cell is connected with the dangerous gas container through the first valve and is used for containing dangerous gas leaked from the dangerous gas container; the inert gas container is connected with the dangerous gas container through the second valve and is used for storing inert gas.
In one embodiment, the method for detecting the dangerous gas includes:
acquiring first spectrum data and second spectrum data;
when the second spectrum data is detected to be different from the first spectrum data, judging that the dangerous gas container leaks the dangerous gas into the photoacoustic cell;
The first spectrum data is absorption peak spectrum data when the dangerous gas does not exist in the photoacoustic cell, and the second spectrum data is absorption peak spectrum data in the photoacoustic cell when the dangerous gas leaks from the dangerous gas container.
In one embodiment, the method further comprises:
acquiring a plurality of third spectrum data and second spectrum data, wherein the third spectrum data are spectrum data obtained by spectrum acquisition of a plurality of dangerous gases with different concentrations, and the second spectrum data are absorption peak spectrum data in the photoacoustic cell when the dangerous gas container leaks the dangerous gases;
and determining the concentration of the dangerous gas in the photoacoustic cell according to the comparison result of the third spectrum data and the second spectrum data.
In one embodiment, the method further comprises:
Acquiring pressure data and temperature data in the photoacoustic cell;
And determining the diffusion coefficient of the mixed gas in the photoacoustic cell according to the pressure data and the temperature data.
In one embodiment, the diffusion coefficient is calculated using the following formula:
Wherein D AB represents the diffusion coefficient of the mixed gas in the photoacoustic cell; t is the temperature within the photoacoustic cell and P Total (S) is the total pressure within the photoacoustic cell; m A、MB is the molecular weight of the dangerous gas and the inert gas respectively; v A、vB represents the molecular diffusion volumes of the hazardous gas and the inert gas, respectively.
A computer device comprising a memory storing a computer program and a processor implementing the steps of the method described above when the processor executes the computer program.
According to the gas detection device, the gas detection method and the computer equipment, the gas detection device is arranged for the dangerous gas container, the gas detection device comprises the photoacoustic cell, the inert gas container and the dangerous gas detection module, the photoacoustic cell is connected with the dangerous gas container, when gas leakage occurs in the dangerous gas container, the dangerous gas leaked by the photoacoustic Chi Chengfang is closed, the first valve of the dangerous gas container is closed, the second valve of the inert gas container is opened, the dangerous gas in the photoacoustic cell is diluted by the inert gas, so that the concentration of the dangerous gas in the photoacoustic cell is reduced until the concentration safety threshold is reached, and explosion dangerous accidents are avoided.
Drawings
FIG. 1 is a block diagram of a gas detection apparatus in one embodiment;
FIG. 2 is a block diagram of a gas detection apparatus in one embodiment;
FIG. 3 is a block diagram of a gas detection apparatus in one embodiment;
FIG. 4 is a block diagram of a gas detection apparatus in one embodiment;
FIG. 5 is a flow chart of a method of detecting a gas in one embodiment;
Fig. 6 is an internal structural diagram of a computer device in one embodiment.
Detailed Description
The present application will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
In one embodiment, as shown in fig. 1, a gas detection device is provided for use on a hazardous gas container 102 having a first valve 112 thereon, the detection device comprising a photoacoustic cell 104, an inert gas container 106, and a hazardous gas detection module 108.
Specifically, the photoacoustic cell 104 is connected to the hazardous gas container 102 through the first valve 112, and when the hazardous gas in the hazardous gas container 102 leaks, the photoacoustic cell 104 is used for containing the hazardous gas leaking from the hazardous gas container 102. The inert gas container 106 has a second valve 110, the inert gas container 106 is connected to the hazardous gas container 102 through the second valve 110, and the inert gas container 106 is used for storing inert gas. Inert gas may be input to photoacoustic cell 104 through second valve 110, which may dilute the hazardous gas contained in photoacoustic cell 104.
When the presence of the hazardous gas in the photoacoustic cell is detected, the hazardous gas detection module 108 sends a closing signal to the first valve 112, the first valve 112 is closed, and the hazardous gas container 102 stops delivering the hazardous gas. The hazardous gas detection module 108 sends an open signal to the second valve 110, the second valve 110 is open, the inert gas container 106 outputs inert gas to the photoacoustic cell 104, and the hazardous gas in the photoacoustic cell 104 is diluted by the inert gas.
In one embodiment, the hazardous gas may be an explosive gas such as hydrogen and the inert gas may be helium. Helium has a relatively high diffusivity, and the leaked hydrogen is diluted by helium until the lower explosion limit of the hydrogen is reached.
Among the above-mentioned gas detection device, set up gas detection device for the dangerous gas container, gas detection device includes the optoacoustic cell, inert gas container and dangerous gas detection module, the optoacoustic cell is connected with dangerous gas container, when dangerous gas container takes place the gas and reveal, the dangerous gas that optoacoustic Chi Chengfang revealed, and close the first valve of dangerous gas container and open the second valve of inert gas container, utilize the dangerous gas in the inert gas dilution optoacoustic cell, in order to reduce the concentration of dangerous gas in the optoacoustic cell, until reaching concentration safety threshold, the emergence of explosion dangerous accident is avoided.
In one embodiment, the hazardous gas detection module is further configured to acquire the first spectrum data and the second spectrum data, and determine that the hazardous gas container leaks hazardous gas into the photoacoustic cell when the second spectrum data is detected to be different from the first spectrum data.
The first spectrum data are absorption peak spectrum data when no dangerous gas exists in the photoacoustic cell, and the second spectrum data are absorption peak spectrum data in the photoacoustic cell when dangerous gas leaks from the dangerous gas container.
Specifically, when no dangerous gas exists in the photoacoustic cell, absorption peak spectrum data in the photoacoustic cell is collected and recorded as first spectrum data. When the dangerous gas container outputs dangerous gas through the photoacoustic cell, the gas in the photoacoustic cell can be air if leakage does not occur. If leakage occurs, dangerous gas exists in the photoacoustic cell, and the gas in the photoacoustic cell can be mixed gas of air and dangerous gas. The gas composition in the photoacoustic cell changes, as does the absorption peak spectrum data in the photoacoustic cell. In the process that the dangerous gas container outputs dangerous gas through the photoacoustic cell, the gas in the photoacoustic cell can be subjected to spectrum acquisition to obtain second spectrum data. The dangerous gas detection module can acquire first spectrum data in advance, compares the first spectrum data with second spectrum data, and when detecting that the second spectrum data is different from the first spectrum data, indicates that dangerous gas except air exists in the photoacoustic cell, and can judge that the dangerous gas container leaks dangerous gas into the photoacoustic cell.
In this embodiment, in the process that the dangerous gas container outputs dangerous gas through the photoacoustic cell, the second spectrum data is obtained, the first spectrum data is used as a reference, whether the gas components in the photoacoustic cell change or not is judged, if the two are different, the dangerous gas leakage can be rapidly judged, and therefore the first valve is closed and the second valve is opened in time to dilute the dangerous gas, and further, sensitive detection can be achieved on the leaked dangerous gas through the dangerous gas detection module.
In one embodiment, as shown in FIG. 2, the apparatus further includes a variable frequency laser 202, a microphone 204, a lock-in amplifier 206, and a second spectrum acquisition module 208. Specifically, the variable frequency laser 202 is configured to provide laser light with different frequencies for irradiating the mixed gas in the photoacoustic cell, and the laser light wave can be enhanced after passing through the focusing lens 210. The mixed gas includes a dangerous gas and an inert gas. A microphone 204 is mounted on the photoacoustic cell 104, the microphone 204 being used to detect pressure fluctuation signals. The lock-in amplifier 206 is connected to the output of the microphone 204, and the lock-in amplifier 206 is used to convert the pressure fluctuation signal into an optical electrical signal. The second spectrum acquisition module 208 is configured to analyze the photoelectric signal to obtain second spectrum data.
In some embodiments, the generating of the first map data comprises: the variable frequency laser 202 is also used to provide laser light at different frequencies that illuminate the air within the photoacoustic cell. While microphone 204 detects the pressure fluctuation signal. The lock-in amplifier 206 is connected to the output of the microphone 204, and the lock-in amplifier 206 converts the pressure fluctuation signal detected by the microphone 204 into a photoelectric signal corresponding to air, and analyzes the photoelectric signal corresponding to air to obtain first spectrum data.
In this embodiment, the detection of the concentration of the dangerous gas is realized through the photoacoustic spectroscopy technology, and the second spectrum data is detected in real time, so that the leakage of the dangerous gas can be found in time, and the hysteresis of the leakage of the dangerous gas can be avoided.
In one embodiment, the apparatus further comprises: and the frequency adjusting module is used for adjusting the frequency of the variable frequency laser according to the second spectrum data.
Specifically, the corresponding relation between the output frequency of the laser and the concentration of the dangerous gas is stored in advance, when the mixed gas in the photoacoustic cell is irradiated by laser, the concentration of the dangerous gas is determined according to the second spectrum data, the corresponding relation between the output frequency of the laser and the concentration of the dangerous gas is searched according to the concentration of the dangerous gas, and the output frequency corresponding to the concentration of the dangerous gas is determined, so that the frequency of the variable-frequency laser is adjusted through the second spectrum data of the frequency adjusting module. So as to improve the quality of the atlas and ensure the accuracy of the detection result.
In one embodiment, the apparatus further comprises: the gas concentration detection module is used for acquiring a plurality of third spectrum data and second spectrum data and determining the concentration of dangerous gas in the photoacoustic cell according to the comparison result of each third spectrum data and the second spectrum data;
The third spectrum data is spectrum data obtained by spectrum acquisition of a plurality of dangerous gases with different concentrations. Specifically, a photoacoustic spectroscopy technology may be adopted, and spectrum collection is performed in advance for a plurality of dangerous gases with different concentrations, so as to obtain a plurality of third spectrum data. Each concentration corresponds to a respective third spectral data. Variable frequency laser 202 provides laser light at different frequencies that illuminate the mixed gas within the photoacoustic cell. The mixed gas may include air, hazardous gas, and inert gas. Microphone 204 is used to detect pressure fluctuation signals. The lock-in amplifier 206 is connected to the output of the microphone 204, and the lock-in amplifier 206 is used to convert the pressure fluctuation signal into an optical electrical signal. The second spectrum acquisition module 208 is configured to analyze the photoelectric signal to obtain second spectrum data. The gas concentration detection module acquires a plurality of third spectrum data and second spectrum data, compares the second spectrum data with the plurality of third spectrum data, and acquires the concentration corresponding to the third spectrum data when the second spectrum data is matched with any one of the third spectrum data, namely the concentration of dangerous gas in the photoacoustic cell.
In the embodiment, the concentration of the dangerous gas is detected through the photoacoustic spectroscopy technology, a complex device and operation are not needed, the concentration of the dangerous gas can be timely detected, and reference data is provided for adopting an emergency risk avoiding means.
In one embodiment, the gas concentration detection module is further configured to send an exhaust signal to an exhaust valve of the photoacoustic cell when the concentration of the hazardous gas in the photoacoustic cell reaches the concentration safety threshold, so that the photoacoustic cell opens the exhaust valve and the mixed gas with the concentration reaching the concentration safety threshold is discharged through the exhaust valve. The concentration safety threshold may be determined in connection with practical situations, such as the kind of dangerous gas, the kind of inert gas, etc.
In this embodiment, by detecting the concentration of the dangerous gas, it is timely known whether the concentration of the dangerous gas in the photoacoustic cell reaches the concentration safety threshold, if so, the dangerous gas is timely discharged through the exhaust valve, and the potential safety hazard is eliminated.
In one embodiment, as shown in FIG. 3, the apparatus further includes a temperature and pressure sensor 302 and a diffusion coefficient determination module. Specifically, a temperature pressure sensor 302 is disposed within the photoacoustic cell 104, the temperature pressure sensor 302 being configured to acquire pressure data and temperature data within the photoacoustic cell 104. And the diffusion coefficient determining module is used for determining the diffusion coefficient of the mixed gas in the photoacoustic cell according to the pressure data and the temperature data.
Specifically, when dangerous gas leakage occurs, the gas phase components between the photoacoustic cells are changed, the corresponding relation between the laser frequency and the acoustic signal under normal conditions is changed, and at the same time, the temperature and pressure sensor 302 located in the photoacoustic cell 104 acts, and pressure data and temperature data are collected and stored in real time. In order to further study the diffusivity of inert gas in dangerous gas, the diffusivity of mixed gas in the photoacoustic cell is determined according to pressure data and temperature data based on a mathematical model of molecular dynamics.
In this embodiment, the diffusion coefficient of the inert gas in the hazardous gas can also be calculated based on the gas detection device, without requiring complicated devices and operations. In some embodiments, the inert gas may be helium, and the hazardous gas may be hydrogen, and the diffusion coefficient of helium in hydrogen is detected by the gas detection device in this embodiment.
In one embodiment, the diffusion coefficient is calculated using the following formula:
Wherein D AB represents the diffusion coefficient of the mixed gas in the photoacoustic cell; t is the temperature in the photoacoustic cell, and P Total (S) is the total pressure in the photoacoustic cell; m A、MB is the molecular weight of the dangerous gas and the inert gas respectively; v A、vB represents the molecular diffusion volumes of the hazardous gas and the inert gas, respectively.
In one embodiment, as shown in fig. 4, the present application provides a gas detection apparatus for use on a hazardous gas container 102 having a first valve 112 thereon, the apparatus comprising a photoacoustic cell 104, an inert gas container 106, a hazardous gas detection module 108, a variable frequency laser 202, a microphone 204, a lock-in amplifier 206, and a second spectrum acquisition module 208, a frequency adjustment module 402, a gas concentration detection module 404, a temperature pressure sensor 302, and a diffusion coefficient determination module 406. The inert gas container 106 has a second valve 110. The photoacoustic cell may be an exhaust valve 408, and when the concentration of the hazardous gas in the photoacoustic cell reaches the concentration safety threshold, an exhaust signal is sent to the exhaust valve 408 of the photoacoustic cell, so that the photoacoustic cell opens the exhaust valve and the mixed gas with the concentration reaching the concentration safety threshold is discharged through the exhaust valve. The concentration safety threshold may be determined in connection with practical situations, such as the kind of dangerous gas, the kind of inert gas, etc. The functions of the respective constituent elements have been described above and will not be described in detail herein.
In some embodiments, the hazardous gas detection module 108, the second spectrum acquisition module 208, the gas concentration detection module 404, the frequency adjustment module 402, and the diffusion coefficient determination module 406 may be integrated on one computer device (e.g., referred to as a data processing and feedback center), or may be distributed on different computer devices (e.g., referred to as a data processing and feedback center, and the data processing and feedback center includes several computer devices).
In some embodiments, where a hazardous gas is exemplified by hydrogen and an inert gas is exemplified by helium, the data processing and feedback center performs a determination of the relationship between the laser absorption spectra and the laser emission frequencies of air and hydrogen before performing the monitoring function. When leaked hydrogen enters the photoacoustic cell, an optical signal different from air can be generated, then the data collection and feedback center receives an abnormal absorption peak spectrum, an instruction is sent out, the first valve 112 is closed, the second valve 110 is opened, the leaked hydrogen is diluted, the frequency of the variable-frequency laser transmitter is controlled by the frequency modulation pulse power supply, the value of the optical absorption frequency is changed to the hydrogen absorption peak spectrum, meanwhile, the temperature and the pressure are measured by the temperature and pressure sensor, the change of the hydrogen absorption peak spectrum is continuously observed along with the continuous addition of helium until the hydrogen concentration is reduced to 4%, and the second valve 110 can be controlled to be closed. Meanwhile, the diffusion coefficient is calculated through the molecular dynamics mathematical model, the data acquisition and analysis are completed by the data processing and feedback center, and after the safety of the gas in the photoacoustic cell is confirmed, the exhaust valve 408 is opened, and the safe mixed gas is exhausted out of the outdoor environment.
In some embodiments, the variable frequency laser transmitter driven by the modulated pulse power supply can transmit optical signals with different frequencies, and the optical waves are enhanced after passing through the focusing lens; the valve connected with the high-pressure helium tank is normally closed, the valve connected with the liquid hydrogen storage tank is normally opened, after the liquid hydrogen storage tank leaks, vaporized hydrogen enters the photoacoustic cell to be excited, local heating is caused by absorbed energy to generate sound waves, a microphone positioned outside the photoacoustic cell can convert sound signals into corresponding electric signals, and the corresponding electric signals are amplified by the lock image amplifier and transmitted to a data collection and feedback center together with data measured by the temperature pressure sensor; and finally, the data collection and feedback center guides the variable frequency laser to adjust the frequency so as to measure the concentration of absorbed hydrogen, the absorbed hydrogen is safely discharged from the exhaust valve after reaching the lower limit of 4 percent of hydrogen explosion, and the diffusion coefficient is calculated through a molecular dynamics mathematical model.
In one embodiment, the present application provides a gas detection method applied to a dangerous gas container, where the dangerous gas container has a first valve thereon, the detection method includes: when the existence of dangerous gas in the photoacoustic cell is detected, a closing signal is sent to a first valve of the dangerous gas container, and an opening signal is sent to a second valve of the inert gas container, so that the inert gas container outputs inert gas to the photoacoustic cell, and the dangerous gas in the photoacoustic cell is diluted by the inert gas.
The photoacoustic cell is connected with the dangerous gas container through the first valve and is used for containing dangerous gas leaked from the dangerous gas container; the inert gas container is connected with the dangerous gas container through the second valve and is used for storing inert gas.
In one embodiment, the method for detecting the dangerous gas includes:
acquiring first spectrum data and second spectrum data;
when the second spectrum data is detected to be different from the first spectrum data, judging that the dangerous gas container leaks the dangerous gas into the photoacoustic cell;
The first spectrum data is absorption peak spectrum data when the dangerous gas does not exist in the photoacoustic cell, and the second spectrum data is absorption peak spectrum data in the photoacoustic cell when the dangerous gas leaks from the dangerous gas container.
In one embodiment, the method further comprises:
acquiring a plurality of third spectrum data and the second spectrum data, wherein the third spectrum data are spectrum data obtained by spectrum acquisition of a plurality of dangerous gases with different concentrations, and the second spectrum data are absorption peak spectrum data in the photoacoustic cell when the dangerous gas container leaks the dangerous gases;
and determining the concentration of the dangerous gas in the photoacoustic cell according to the comparison result of the third spectrum data and the second spectrum data.
In one embodiment, the method further comprises:
Acquiring pressure data and temperature data in the photoacoustic cell;
And determining the diffusion coefficient of the mixed gas in the photoacoustic cell according to the pressure data and the temperature data.
In one embodiment, the diffusion coefficient is calculated using the following formula:
Wherein D AB represents the diffusion coefficient of the mixed gas in the photoacoustic cell; t is the temperature within the photoacoustic cell and P Total (S) is the total pressure within the photoacoustic cell; m A、MB is the molecular weight of the dangerous gas and the inert gas respectively; v A、vB represents the molecular diffusion volumes of the hazardous gas and the inert gas, respectively.
In one embodiment, the present application provides a gas detection method applied to a dangerous gas container, where the dangerous gas container has a first valve, as shown in fig. 5, and the detection method includes:
S510, acquiring first spectrum data.
The first spectrum data are absorption peak spectrum data when no dangerous gas exists in the photoacoustic cell.
S520, acquiring second spectrum data.
The second spectrum data is absorption peak spectrum data in the photoacoustic cell when the dangerous gas container leaks dangerous gas.
And S530, when the second spectrum data is detected to be different from the first spectrum data, judging that the dangerous gas container leaks dangerous gas into the photoacoustic cell.
S540, sending a closing signal to a first valve of the dangerous gas container and sending an opening signal to a second valve of the inert gas container so that the inert gas container outputs inert gas to the photoacoustic cell, and diluting the dangerous gas in the photoacoustic cell by the inert gas;
The photoacoustic cell is connected with the dangerous gas container through a first valve and is used for containing dangerous gas leaked from the dangerous gas container; the inert gas container is connected with the dangerous gas container through a second valve and is used for storing inert gas.
S550, acquiring a plurality of third spectrum data.
Wherein the third spectrum data is spectrum data obtained by spectrum acquisition of a plurality of dangerous gases with different concentrations,
S560, determining the concentration of the dangerous gas in the photoacoustic cell according to the comparison result of the third spectrum data and the second spectrum data.
And S570, when the concentration of the dangerous gas in the photoacoustic cell reaches a concentration safety threshold, sending an exhaust signal to an exhaust valve of the photoacoustic cell so that the photoacoustic cell opens the exhaust valve and the mixed gas with the concentration reaching the concentration safety threshold is discharged through the exhaust valve.
S580, acquiring pressure data and temperature data in the photoacoustic cell;
S590, determining the diffusion coefficient of the mixed gas in the photoacoustic cell according to the pressure data and the temperature data.
Specifically, the diffusion coefficient is calculated using the following formula:
Wherein D AB represents the diffusion coefficient of the mixed gas in the photoacoustic cell; t is the temperature within the photoacoustic cell and P Total (S) is the total pressure within the photoacoustic cell; m A、MB is the molecular weight of the dangerous gas and the inert gas respectively; v A、vB represents the molecular diffusion volumes of the hazardous gas and the inert gas, respectively.
For specific limitations on the gas detection method, reference may be made to the above limitations on the gas detection device, and no further description is given here. The various modules in the gas detection apparatus described above may be implemented in whole or in part by software, hardware, and combinations thereof. The above modules may be embedded in hardware or may be independent of a processor in the computer device, or may be stored in software in a memory in the computer device, so that the processor may call and execute operations corresponding to the above modules.
In one embodiment, a computer device is provided, which may be a terminal, and the internal structure of which may be as shown in fig. 6. The computer device includes a processor, a memory, a communication interface, a display screen, and an input device connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The communication interface of the computer device is used for carrying out wired or wireless communication with an external terminal, and the wireless mode can be realized through WIFI, an operator network, NFC (near field communication) or other technologies. The computer program is executed by a processor to implement a gas detection method. The display screen of the computer equipment can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer equipment can be a touch layer covered on the display screen, can also be keys, a track ball or a touch pad arranged on the shell of the computer equipment, and can also be an external keyboard, a touch pad or a mouse and the like.
It will be appreciated by those skilled in the art that the structure shown in FIG. 6 is merely a block diagram of some of the structures associated with the present inventive arrangements and is not limiting of the computer device to which the present inventive arrangements may be applied, and that a particular computer device may include more or fewer components than shown, or may combine some of the components, or have a different arrangement of components.
In an embodiment, a computer device is provided comprising a memory and a processor, the memory having stored therein a computer program, the processor implementing the method steps of the above embodiments when the computer program is executed.
In an embodiment, a computer-readable storage medium is provided, on which a computer program is stored which, when being executed by a processor, implements the method steps of the above embodiments.
Those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in embodiments provided herein may include at least one of non-volatile and volatile memory. The nonvolatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical Memory, or the like. Volatile memory can include random access memory (Random Access Memory, RAM) or external cache memory. By way of illustration, and not limitation, RAM can be in various forms such as static random access memory (Static Random Access Memory, SRAM) or dynamic random access memory (Dynamic Random Access Memory, DRAM), etc.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.
Claims (8)
1. A gas detection device for use with a hazardous gas container having a first valve thereon, the detection device comprising:
The photoacoustic cell is connected with the dangerous gas container through the first valve and is used for containing dangerous gas leaked from the dangerous gas container;
an inert gas container having a second valve, connected to the photoacoustic cell through the second valve, for storing an inert gas;
the dangerous gas detection module is used for sending a closing signal to the first valve and sending an opening signal to the second valve when the dangerous gas exists in the photoacoustic cell, so that the inert gas container outputs the inert gas to the photoacoustic cell, and the dangerous gas in the photoacoustic cell is diluted by the inert gas;
The dangerous gas detection module is further used for acquiring first spectrum data and second spectrum data, and judging that the dangerous gas container leaks the dangerous gas into the photoacoustic cell when the second spectrum data is detected to be different from the first spectrum data;
The first spectrum data is absorption peak spectrum data when the dangerous gas does not exist in the photoacoustic cell, and the second spectrum data is absorption peak spectrum data in the photoacoustic cell when the dangerous gas container leaks the dangerous gas;
The gas concentration detection module is used for acquiring a plurality of third spectrum data and the second spectrum data and determining the concentration of dangerous gas in the photoacoustic cell according to the comparison result of each third spectrum data and the second spectrum data;
The third spectrum data are spectrum data obtained by spectrum acquisition of a plurality of dangerous gases with different concentrations.
2. The apparatus of claim 1, wherein the apparatus further comprises:
The variable frequency laser is used for providing laser with different frequencies for irradiating mixed gas in the photoacoustic cell, wherein the mixed gas comprises the dangerous gas and the inert gas;
a microphone mounted on the photoacoustic cell for detecting a pressure fluctuation signal;
The lock-in amplifier is connected with the output end of the microphone and is used for converting the pressure fluctuation signal into an optical electric signal;
The second spectrum acquisition module is used for analyzing the photoelectric signals to obtain second spectrum data;
and the frequency adjusting module is used for adjusting the frequency of the variable frequency laser according to the second spectrum data.
3. The apparatus of claim 1, wherein the apparatus further comprises:
And the gas concentration detection module is further used for sending an exhaust signal to an exhaust valve of the photoacoustic cell when the concentration of the dangerous gas in the photoacoustic cell reaches a concentration safety threshold value, so that the photoacoustic cell opens the exhaust valve and discharges the mixed gas with the concentration reaching the concentration safety threshold value through the exhaust valve.
4. A device according to any one of claims 1 to 3, further comprising:
the temperature and pressure sensor is arranged in the photoacoustic cell and used for acquiring pressure data and temperature data in the photoacoustic cell;
the diffusion coefficient determining module is used for calculating the diffusion coefficient of the mixed gas in the photoacoustic cell according to the pressure data and the temperature data by adopting the following formula:
Wherein D AB represents the diffusion coefficient of the mixed gas in the photoacoustic cell; t is the temperature within the photoacoustic cell and P Total (S) is the total pressure within the photoacoustic cell; m A、MB is the molecular weight of the dangerous gas and the inert gas respectively; v A、vB represents the molecular diffusion volumes of the hazardous gas and the inert gas, respectively.
5. A method of gas detection for use with a hazardous gas container having a first valve thereon, the method comprising:
when the existence of dangerous gas in the photoacoustic cell is detected, a closing signal is sent to a first valve of the dangerous gas container, and an opening signal is sent to a second valve of the inert gas container, so that the inert gas container outputs inert gas to the photoacoustic cell, and the dangerous gas in the photoacoustic cell is diluted by the inert gas;
The photoacoustic cell is connected with the dangerous gas container through the first valve and is used for containing dangerous gas leaked from the dangerous gas container; the inert gas container is connected with the photoacoustic cell through the second valve and is used for storing inert gas;
the detection mode of the dangerous gas comprises the following steps:
acquiring first spectrum data and second spectrum data;
when the second spectrum data is detected to be different from the first spectrum data, judging that the dangerous gas container leaks the dangerous gas into the photoacoustic cell;
The first spectrum data is absorption peak spectrum data when the dangerous gas does not exist in the photoacoustic cell, and the second spectrum data is absorption peak spectrum data in the photoacoustic cell when the dangerous gas container leaks the dangerous gas;
acquiring a plurality of third spectrum data and second spectrum data, wherein the third spectrum data are spectrum data obtained by spectrum acquisition of a plurality of dangerous gases with different concentrations, and the second spectrum data are absorption peak spectrum data in the photoacoustic cell when the dangerous gas container leaks the dangerous gases;
and determining the concentration of the dangerous gas in the photoacoustic cell according to the comparison result of the third spectrum data and the second spectrum data.
6. The method of claim 5, wherein the method further comprises:
Acquiring pressure data and temperature data in the photoacoustic cell;
According to the pressure data and the temperature data, the diffusion coefficient of the mixed gas in the photoacoustic cell is calculated by adopting the following formula:
Wherein D AB represents the diffusion coefficient of the mixed gas in the photoacoustic cell; t is the temperature within the photoacoustic cell and P Total (S) is the total pressure within the photoacoustic cell; m A、MB is the molecular weight of the dangerous gas and the inert gas respectively; v A、vB represents the molecular diffusion volumes of the hazardous gas and the inert gas, respectively.
7. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor implements the steps of the method of any of claims 5 or 6 when the computer program is executed.
8. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method of any of claims 5 or 6.
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