Gas sensing device, detection device, method and vehicle

Abstract

The invention relates to a gas sensing device, a detection device, a method and a vehicle, the device comprises a laser, a detection gas chamber, a first photodiode and a second photodiode, the detection gas chamber is used for accommodating to-be-detected gas, and the to-be-detected gas contains particulate matters and gaseous substances; the laser is used for emitting infrared light, the infrared light enters the detection gas chamber as incident light, and scattered light is obtained after a first part of light in the incident light is scattered by the particulate matter; the first photodiode is suitable for collecting at least part of the scattered light; and the second photodiode is suitable for collecting a second part of light which is not scattered and not absorbed by the gaseous substance in the incident light. According to the device, the method and the vehicle, particulate matters and at least one gas in the air can be detected through one gas sensing device, structural redundancy of a light source, a gas chamber and the like is avoided, so that the size of the device is reduced, the device is better hidden in a narrow space, and the device is long in service life and low in price.

Description

Technical Field

[0001] The present application relates to the technical field of gas detection, and more specifically to a gas sensing device, a detection device, a method and a vehicle. Background Art

[0002] The emergence of various epidemic diseases in recent years has aroused people's attention to environmental pathogenic microorganisms. Air quality has a great impact on human health. Pollutants in the air are the predisposing factors of many diseases. Pollutants in the air that are harmful to the human body mainly include: particulate matter, carbon monoxide, ozone, carbon dioxide, etc. At present, driving a car has become the preferred means of transportation for people to go out, so how to detect whether the air quality in the car is clean and safe for people to breathe has become an important issue.

[0003] In the prior art, most sensors for detecting gas use electrochemical gas sensors. On the one hand, electrochemical gas sensors have a short service life, complex calibration work, high prices and frequent replacement rhythms, which bring extremely high maintenance costs to users. On the other hand, the large size of electrochemical sensors makes it a huge challenge to conceal them in a small space. Summary of the invention

[0004] The present application is proposed to solve the above problems. According to one aspect of the present application, a gas sensing device is provided, the device comprising: a laser, a detection gas chamber, a first photodiode, and a second photodiode, wherein: the detection gas chamber is used to contain a gas to be detected, and the gas to be detected contains particulate matter and gaseous substances; the laser is used to emit infrared light, the infrared light enters the detection gas chamber as incident light, and the first part of the incident light is scattered by the particulate matter to obtain scattered light; the first photodiode is suitable for collecting at least part of the scattered light; the second photodiode is suitable for collecting the second part of the incident light that is not scattered and not absorbed by the gaseous substance.

[0005] In one embodiment of the present application, a reflector is disposed in the detection chamber, the first photodiode is disposed at twice the focal length of the reflector, and at least part of the scattered light is reflected by the reflector to the first photodiode.

[0006] In one embodiment of the present application, the second photodiode and the laser are arranged along the same axis.

[0007] In one embodiment of the present application, the gas substance includes ozone, and the laser includes a first laser that emits a first infrared light.

[0008] In one embodiment of the present application, the gas substance includes carbon dioxide, and the laser includes a second laser, and the second laser emits a second infrared light.

[0009] In one embodiment of the present application, the gaseous substance includes ozone and carbon dioxide, the laser includes a first laser and a second laser, the first laser emits a first infrared light, the second laser emits a second infrared light, and the number of the second photodiodes is at least two, wherein: the light in the second part of light corresponding to the first infrared light is collected by one of the second photodiodes, and the light in the second part of light corresponding to the second infrared light is collected by another of the second photodiodes, wherein the value of the wavelength range of the first infrared light is greater than the value of the wavelength range of the second infrared light.

[0010] In one embodiment of the present application, the wavelength range of the first infrared light emitted by the first laser is 9100 nm to 10000 nm.

[0011] In one embodiment of the present application, the wavelength range of the second infrared light emitted by the second laser is 4160 nm to 4350 nm.

[0012] In one embodiment of the present application, the device further comprises a blower, and the blower is used to transport the gas to be tested to the detection gas chamber.

[0013] In one embodiment of the present application, the device further comprises a collimating lens unit, and the infrared light emitted by the laser passes through the collimating lens unit and enters the detection gas chamber as the incident light.

[0014] In one embodiment of the present application, the device further includes a modulation unit, and the laser emits the infrared light under modulation of the modulation unit.

[0015] In one embodiment of the present application, the device also includes a first operational amplifier circuit and a second operational amplifier circuit, wherein: the first photodiode outputs a first electrical signal based on the collected light, the first operational amplifier circuit is used to amplify the first electrical signal, and the first electrical signal is used to detect the intensity of the scattered light; the second photodiode outputs a second electrical signal based on the collected light, the second operational amplifier circuit is used to amplify the second electrical signal, and the second electrical signal is used to detect the intensity of the second part of light.

[0016] According to another aspect of the present application, a gas detection device is provided, which includes: a gas sensor device and a signal processing device, wherein: the gas sensor device is communicatively connected to the signal processing device, and the gas sensor device is the above-mentioned gas sensor device; the signal processing device is used to process the output signal of the gas sensor device to obtain a detection result.

[0017] In one embodiment of the present application, the signal processing device includes an analog-to-digital signal converter and a digital processing unit, wherein: the analog-to-digital signal converter is used to convert the analog output signal of the gas sensor device into a digital signal; and the digital processing unit is used to calculate the detection result based on the digital signal.

[0018] In one embodiment of the present application, the digital processing unit is also connected to the fan and the modulation unit in the gas sensing device, and is used to control the fan, and control the laser by controlling the modulation unit.

[0019] According to another aspect of the present application, a gas detection method is provided, in which infrared light is emitted as incident light to a detection gas chamber by a laser, wherein the detection gas chamber contains a gas to be detected, and the gas to be detected contains particulate matter and gaseous substances, wherein a first part of the incident light is scattered by the particulate matter to obtain scattered light; at least a part of the scattered light is collected by a first photodiode to obtain a first signal for characterizing the intensity of the scattered light; a second part of the incident light that is not scattered and not absorbed by the gaseous substance is collected by a second photodiode to obtain a second signal for characterizing the intensity of the second part of the light; and the concentration of the gaseous substance is determined based on the first signal and the second signal.

[0020] In one embodiment of the present application, the method further includes determining the concentration of the particulate matter based on the first signal.

[0021] In one embodiment of the present application, determining the concentration of the particulate matter based on the first signal includes: determining the scattered light intensity of all scattered light based on the first signal, and determining the concentration of the particulate matter based on the scattered light intensity and a first function, wherein the first function is a preset function that reflects the correspondence between the scattered light intensity and the concentration of the particulate matter.

[0022] In one embodiment of the present application, the scattered light intensity of all scattered light is determined based on the first signal, including: determining a predetermined proportional relationship between the scattered light intensity values ​​corresponding to all scattered light and the scattered light intensity values ​​of the scattered light collected by the first photodiode through a calibration method; determining the scattered light intensity values ​​of the scattered light collected by the first photodiode based on the first signal; and determining the scattered light intensity of all scattered light based on the scattered light intensity values ​​of the scattered light collected by the first photodiode and the predetermined proportional relationship.

[0023] In one embodiment of the present application, determining the concentration of the gas substance based on the first signal and the second signal includes: determining the scattered light intensity of the scattered light collected by the first photodiode based on the first signal, and determining the intensity of the second part of light based on the second signal; determining the concentration of the gas substance based on the scattered light intensity of the scattered light collected by the first photodiode, the intensity of the second part of light, and a second function, wherein the second function is a preset function that reflects the correspondence between the scattered light intensity of the scattered light collected by the first photodiode, the intensity of the second part of light, and the concentration of the gas substance.

[0024] In one embodiment of the present application, the gas substance is ozone or carbon dioxide.

[0025] In one embodiment of the present application, after acquiring the first signal and the second signal, the method further includes: determining whether the first signal and the second signal meet detection requirements; when the detection requirements are met, calculating the concentrations of the particulate matter and the gaseous substance; when the detection requirements are not met, adjusting the light source parameters of the laser.

[0026] According to another aspect of the present application, a device is provided, comprising a processor and a memory, wherein the memory stores a computer executable program run by the processor, and when the computer executable program is run by the processor, the processor executes the above-mentioned gas detection method.

[0027] According to another aspect of the present application, a storage medium is provided, on which a computer program to be executed by a processor is stored. When the computer program is executed by the processor, the processor executes the above-mentioned gas detection method.

[0028] According to yet another aspect of the present application, a vehicle is provided, comprising the above-mentioned gas sensing device or the above-mentioned gas detection device.

[0029] The gas sensor device, detection device, method and vehicle of the present application can detect particulate matter and at least one gas in the air through a gas sensor device, avoiding the situation where different gas sensor devices are required to detect different gases or particulate matter, which leads to structural redundancy of light sources, air chambers, etc., reduces the size of the device, makes it better to be concealed in a small space, and the device has a long life and is inexpensive. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] By describing the embodiments of the present application in more detail in conjunction with the accompanying drawings, the above and other purposes, features and advantages of the present application will become more apparent. The accompanying drawings are used to provide a further understanding of the embodiments of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the present application and do not constitute a limitation of the present application. In the accompanying drawings, the same reference numerals generally represent the same components or steps.

[0031] Figure 1 A schematic structural block diagram of a gas sensing device according to an embodiment of the present application is shown.

[0032] Figure 2 A schematic structural block diagram of a detection gas chamber in a gas sensor device according to an embodiment of the present application is shown.

[0033] Figure 3 A schematic structural block diagram of another gas sensing device according to an embodiment of the present application is shown.

[0034] Figure 4 A schematic structural block diagram of a gas detection device according to an embodiment of the present application is shown.

[0035] Figure 5 A schematic structural block diagram of another gas detection device according to an embodiment of the present application is shown.

[0036] Figure 6 A schematic flow chart of a gas detection method according to an embodiment of the present application is shown.

[0037] Figure 7 A variable relationship diagram of gas concentration according to an embodiment of the present application is shown.

[0038] Figure 8 A schematic flow chart of another gas detection method according to an embodiment of the present application is shown.

[0039] Fig. 9 A schematic structural block diagram of another gas detection device according to an embodiment of the present application is shown. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solutions and advantages of the present application more obvious, the example embodiments according to the present application will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application, and it should be understood that the present application is not limited to the example embodiments described herein. Based on the embodiments of the present application described in the present application, all other embodiments obtained by those skilled in the art without creative work should fall within the scope of protection of the present application.

[0041] First, refer to Figure 1 The gas sensing device 100 according to an embodiment of the present application is described. Figure 1 A schematic structural block diagram of a gas sensor device 100 according to an embodiment of the present application is shown.

[0042] like Figure 1 As shown, the gas sensor device 100 includes a laser 111, a detection gas chamber 112, a first photodiode 113, and a second photodiode 114, wherein: the detection gas chamber 112 is used to accommodate a gas to be detected, and the gas to be detected contains particulate matter and gaseous substances; the laser 111 is used to emit infrared light, and the infrared light enters the detection gas chamber 112 as incident light, and a first part of the incident light is scattered by the particulate matter to obtain scattered light; the first photodiode 113 is suitable for collecting at least part of the scattered light; the second photodiode 114 is suitable for collecting a second part of the incident light that is not scattered and not absorbed by the gaseous substance.

[0043] In an embodiment of the present application, an integrated multifunctional sensing device is provided, which integrates a laser 111, a detection gas chamber 112, and a photodiode and other devices to detect the acquired gas to be measured, and can simultaneously detect particulate matter and gaseous substances in the gas to be measured. Among them, the detection chamber 112 contains the gas to be measured, and there are particulate matter and gaseous substances in the gas to be measured. At this time, the laser 111 emits infrared light into the detection gas chamber 112. When the infrared light enters the detection gas chamber 112, the first part of the incident light collides with the particulate matter in the gas to be measured and is scattered and collected by the first photodiode 113. The second part of the incident light (that is, the light that is not scattered and not absorbed by the gas substance) is collected by the second photodiode 114, so that the particulate matter and gaseous substances in the gas to be measured can be detected simultaneously.

[0044] Therefore, the gas sensor device 100 of the present application can detect particulate matter and at least one gas in the air through a gas sensor device, avoiding the situation where different gas sensor devices are required to detect different gases or particulate matter, which leads to structural redundancy of light sources, air chambers, etc., reduces the size of the device, enables it to be better concealed in a small space, and the device has a long life and is inexpensive.

[0045] In an embodiment of the present application, the gas sensor device 100 includes a laser 111, a detection chamber 112, a first photodiode 113, and a second photodiode 114. Specifically, the detection chamber 112 contains a gas to be measured, wherein the gas to be measured may be external gas delivered into the detection system by an air pump inside or outside the passenger compartment or gas under other conditions. The gas to be measured contains particulate matter and gaseous substances, and the particulate matter may be fine particulate matter (ie, PM2.5) or inhalable particulate matter (ie, PM10) or other particulate matter, which is not specifically limited, and the gaseous substance may be ozone or carbon dioxide or other gases.

[0046] In an embodiment of the present application, the gas sensor device 100 further includes a fan, which is used to transfer the gas to be measured to the detection chamber 112. In one example, the fan 110 can be an air circulation fan (ie, an air pump) to transfer the acquired gas to be measured to the detection chamber 112.

[0047] In the embodiment of the present application, after the gas to be measured is transmitted to the detection chamber 112 by the fan, the laser 111 emits infrared light. At this time, the gas sensor device 100 also includes a collimating lens unit (i.e., a collimating lens), and the infrared light passes through the collimating lens unit and enters the gas chamber to be measured 112 as incident light. The collimating lens is usually composed of a lens or a lens group. In the laser 111, the function of the collimating lens is to adjust the laser beam emitted by the laser 111 into a collimated beam, thereby improving the quality and energy density of the beam.

[0048] In the embodiment of the present application, the gas sensor device 100 further includes a modulation unit, and the laser 111 emits infrared light under the modulation of the modulation unit. Since the laser 111 is to emit infrared light of a specific wavelength and parameters, when the infrared light emitted by the laser 111 does not meet the requirements, the laser 111 is controlled by the modulation unit to adjust the emitted infrared light, mainly adjusting the light source parameters of the infrared light, such as signal intensity, pulse width, period and other parameters. Specifically, the voltage is applied to the laser 111 for adjustment, the amplitude of the voltage affects the signal intensity of the infrared light, the duration of the voltage affects the pulse width of the infrared light, and the change period of the voltage affects the period of the infrared light.

[0049] In an embodiment of the present application, the gaseous substance includes ozone, and the laser 111 includes a first laser, which emits a first infrared light. That is, when the gaseous substance in the gas to be measured is ozone, the laser should be a first laser at this time, and the first laser emits a first infrared light (i.e., long-wave infrared light). In this embodiment, the wavelength range of the long-wave infrared light emitted by the first laser is 9100nm to 10000nm. Since the gaseous substance in the gas to be measured is ozone, ozone has a significant absorption peak for radiation within a very narrow frequency band of about 10000nm of infrared wavelength, and can absorb the long-wave radiation of this band, while other common gases (for example, oxygen, nitrogen, carbon monoxide, carbon dioxide, sulfur dioxide, nitric oxide, and nitrogen dioxide) do not have obvious absorption within this range, so the first laser that can emit infrared light with a wavelength range of 9100nm to 10000nm is selected to generate infrared light of a specific wavelength to avoid the cross-sensitivity problem of other gases.

[0050] In an embodiment of the present application, the gaseous substance includes carbon dioxide, and the laser 111 includes a second laser, which emits a second infrared light. That is, when the gaseous substance in the gas to be measured is carbon dioxide, the laser should be a second laser at this time, and the second laser emits a second infrared light (i.e., medium-wave infrared light). In this embodiment, the wavelength range of the medium-wave infrared light emitted by the second laser is 4160nm to 4350nm. Since the gaseous substance in the gas to be measured is carbon dioxide, carbon dioxide has a significant absorption peak for radiation within a frequency band of about 4260nm of infrared wavelength, while other common gases (for example, oxygen, nitrogen, carbon monoxide, ozone, sulfur dioxide, nitric oxide, and nitrogen dioxide) do not have obvious absorption within this range, so a second laser that can emit infrared light with a wavelength range of 4160nm to 4350nm is selected to emit infrared light of a specific wavelength to avoid cross-sensitivity problems of other gases.

[0051] In the embodiment of the present application, a reflector is provided in the detection chamber 112, and further includes a first photodiode 113 and a second photodiode 114. The first photodiode 113 is provided at twice the focal length of the reflector, and at least part of the scattered light is reflected to the first photodiode 113 by the reflector. The second photodiode 114 is provided along the same axis as the laser 111. Figure 2 The structure of the detection chamber 112 is described below. Figure 2As shown, the first photodiode 113 is arranged at twice the focal length of the reflector (i.e., the converging lens). Since the reflector needs to converge the infrared light scattered by the particles in the detection gas to the photosensitive surface of the photodiode (i.e., the first photodiode) for detecting the scattered light intensity, so as to enhance the light intensity amplitude reaching the photosensitive surface, the first photodiode 113 is arranged at twice the focal length of the reflector in the detection gas chamber 112 to enhance the light intensity amplitude reaching the photosensitive surface. The particles collide with part of the light (i.e., the first part of the light) in the incident light (i.e., the infrared light entering the detection gas chamber 112) to obtain scattered light, and at least part of the scattered light is reflected by the reflector and collected by the first photodiode 113. The second photodiode 114 is arranged along the same axis as the laser 111, and the gas substance absorbs part of the incident light, and the incident light (i.e., the second part of the light) other than the scattered light and the absorbed light is collected by the second photodiode 114 as transmitted light. For example, when the gas substance in the gas to be measured is ozone, a part of the incident light collides with the particles in the gas to be measured and is collected by the first photodiode 113, and a part of the incident light is absorbed by the ozone, and the light that is not scattered and not absorbed is collected as transmitted light by the second photodiode 114. In this case, the particles and ozone in the gas to be measured can be detected at the same time.

[0052] In an embodiment of the present application, the gaseous substance includes ozone and carbon dioxide, the laser 111 includes a first laser 1110 and a second laser 1111, the first laser 1110 emits a first infrared light, and the second laser 1111 emits a second infrared light, wherein the value of the wavelength range of the first infrared light is greater than the value of the wavelength range of the second infrared light. Figure 3 As shown, when two gas substances are detected simultaneously, that is, when ozone and carbon dioxide are detected simultaneously, lasers that can emit different wavelengths (that is, the first laser 1110 and the second laser 1111) are needed. Due to the selective absorption characteristics of gas molecules in the near-infrared spectrum, different gas substances will selectively absorb light of a certain wavelength, so lasers that can emit different wavelengths are needed to achieve this, that is, the first laser 1110 and the second laser 1111 are needed to emit infrared light of different wavelengths.

[0053] In this embodiment, if Figure 3As shown, a reflector (i.e., a converging lens) is arranged in the detection gas chamber 112. When it is necessary to detect ozone and carbon dioxide simultaneously, the gas sensing device includes a first photodiode 113 and at least two second photodiodes 114 (i.e., a second photodiode 1140 and another photodiode 1141). The first photodiode 113 is arranged at twice the focal length of the reflector. The particles collide with part of the incident light (i.e., the first part of the light) to obtain scattered light, which is reflected by the reflector and collected by the first photodiode 113. The second photodiode 114 is arranged along the same axis as the laser. The gaseous substances (i.e., ozone and carbon dioxide) absorb part of the incident light, and the incident light (i.e., the second part of the light) other than the scattered light and the absorbed light is collected by the second photodiode 114 as transmitted light. For example, a second photodiode 1140 and a first laser 1110 are arranged along the same axis, and another second photodiode 1141 and a second laser 1111 are arranged along the same axis, that is, the same optical axis, and the light corresponding to the first infrared light in the transmitted light is collected by a second photodiode 1140, and the light corresponding to the second infrared light in the transmitted light is collected by another second photodiode 1141. That is, when particulate matter, ozone, and carbon dioxide are detected simultaneously, at this time, a part of the incident light collides with the emission of particulate matter in the gas to be measured and is collected by the first photodiode 113, and another part of the incident light is absorbed by ozone and carbon dioxide, and the light that is not scattered and not absorbed is used as the transmitted light, and the light corresponding to the first infrared light in the transmitted light is collected by a second photodiode 1140, and the light corresponding to the second infrared light in the transmitted light is collected by another second photodiode 1141.

[0054] In this embodiment, the reflector (i.e., the converging lens) in the detection chamber 112 converges the infrared light scattered by the particles to the photosensitive surface of the photodiode (i.e., the photosensitive surface of the first photodiode 113) for detecting the intensity of the scattered light. The reflector has a concave surface, on which a reflection enhancement film is plated to enhance the reflection effect of the infrared band, and the reflectivity should be 90% to 99% for the target infrared band (such as 4160nm to 4350nm or 9100nm to 10000nm); on the premise that one side is concave, the other side can be a plane or any curved surface, that is, biconcave or plano-concave; when a convex reflector is selected, the coated convex surface should be on the lower surface of the lens, and the other side can be a plane or any curved surface, that is, biconvex or plano-convex lens. The lens material can be fused quartz, organic plastic or sapphire.

[0055] In an embodiment of the present application, the gas sensor device 100 further includes a first operational amplifier circuit and a second operational amplifier circuit, wherein: the first photodiode 113 outputs a first electrical signal based on the collected light, the first operational amplifier circuit is used to amplify the first electrical signal, and the first electrical signal is used to calculate the concentration of particulate matter; the second photodiode 114 outputs a second electrical signal based on the collected light, the second operational amplifier circuit is used to amplify the second electrical signal, and the second electrical signal is used to calculate the concentration of gas other than particulate matter. When the gas substance in the gas to be measured is ozone or carbon dioxide, the light output signal collected by the first photodiode 113 is a part of the incident light colliding with the particulate matter in the gas to be measured as a scattered light signal, the scattered light signal is transmitted to the first operational amplifier circuit, the scattered light signal is amplified, and the concentration of particulate matter in the gas to be measured is calculated; the signal collected by the second photodiode 114 is a transmitted light signal (that is, light that is not scattered and not absorbed by the gas substance is used as a transmitted light signal), the transmitted light signal is transmitted to the second operational amplifier circuit, the transmitted light signal is amplified, and the concentration of the gas substance in the gas to be measured is calculated.

[0056] Therefore, the gas sensor device according to the embodiment of the present application can detect particulate matter and at least one gas substance in the air through one gas sensor device, avoiding the situation where different gas sensor devices are required to detect different gases or particulate matter, which leads to structural redundancy of light sources, air chambers, etc., reduces the size of the device, enables it to be better concealed in a small space, and the device has a long life and is inexpensive.

[0057] Combine the following Figure 4 A gas detection device according to another aspect of the present application is described. Figure 4 A schematic structural block diagram of a gas detection device 400 according to an embodiment of the present application is shown.

[0058] like Figure 4 As shown, the gas detection device 400 includes: a gas sensor device 410 and a signal processing device 420, wherein: the gas sensor device 410 is in communication connection with the signal processing device 420, and the gas sensor device 410 is the gas sensor device described above; the signal processing device 420 is used to process the output signal of the gas sensor device 410 to obtain a detection result. In this embodiment, the gas sensor device 410 is used to detect the gas to be detected and output the required detection signal, and the gas to be detected includes particulate matter and gaseous substances, and the gaseous substances can be ozone or carbon dioxide gas. The gas sensor device 410 outputs the collected detection signal to the signal processing device 420, and the signal processing device 420 performs signal processing based on the acquired detection signal to obtain the detection result.

[0059] In an embodiment of the present application, the signal processing device 420 includes an analog-to-digital signal converter and a digital processing unit, wherein: the analog-to-digital signal converter is used to convert the analog output signal of the gas sensor device 410 into a digital signal; the digital processing unit is used to obtain the detection result based on the digital signal. Since the output signal of the gas sensor device 410 is an analog signal, and the analog signal is continuous in time and amplitude, it is easily interfered by the external environment, while the digital signal is discrete in time and amplitude, which makes the digital signal have stronger anti-interference ability, more stable and convenient for subsequent calculation and processing, so an analog-to-digital signal converter is required to convert the analog signal into a digital signal.

[0060] In an embodiment of the present application, a digital processing unit is connected to an analog-to-digital signal converter for receiving a digital signal transmitted by the analog-to-digital signal converter. In addition, the digital processing unit is also connected to a fan and a modulation unit in the gas sensor device 410 for controlling the fan and controlling the laser by controlling the modulation unit. Specifically, the digital processing unit receives a digital signal output by the analog-to-digital signal converter, controls the fan and the modulation unit of the gas sensor device 410 according to the digital signal, and the modulation unit controls the laser based on the control of the digital processing unit to adjust the laser to emit infrared light of specific parameters. The light source parameters of the infrared light are mainly adjusted, such as signal intensity, pulse width, period and other parameters. Specifically, the voltage is applied to the laser for adjustment, the amplitude of the voltage affects the signal intensity of the infrared light, the duration of the voltage affects the pulse width of the infrared light, and the change period of the voltage affects the period of the infrared light.

[0061] In this embodiment, the digital processing unit receives the digital signal transmitted by the analog-to-digital signal converter, and when it is determined that the digital signal (i.e., the parameters of the infrared light source emitted by the laser) meets the detection requirements, the digital signal is processed to obtain the detection result (i.e., the concentration of particulate matter and the concentration of gaseous substances).

[0062] Combine the following Figure 5 A gas detection device 500 according to another embodiment of the present application is described, which is a more specific structural example diagram of the gas detection device 400 described above. Figure 5As shown, when the gas 1 to be tested enters the detection chamber 5 through the air circulation fan 2, the laser 3 emits a laser, and the laser enters the detection chamber 5 as incident light through the collimating lens unit 4. In the detection chamber 5, the incident light has two effects at the same time. A part of the incident light (i.e., the first part of the light) collides with the particles and is scattered. The scattered light is converged by the reflector in the detection chamber 5 and enters the infrared photodiode 6 on the opposite side of the reflector; a part of the incident light is absorbed by the gas after passing through the detection chamber 5, and the incident light that is not scattered or absorbed by the gas is collected by another infrared photodiode 8 as transmitted light (i.e., the second part of the light). The infrared photodiode 6 transmits the signal to the operational amplifier circuit 7, and the infrared photodiode 8 transmits the signal to the operational amplifier circuit 9, and then transmits the amplified signal to the filter circuit 10, and then converts it into a digital signal through the analog-to-digital signal converter 11 and transmits it to the digital processing unit 12. The digital processing unit 12 determines whether the signal strength, pulse width, period and other parameters meet the detection requirements based on the received digital signal. If they do not meet the detection requirements, the modulation unit 14 is controlled to send an adjustment instruction to control the laser 3 to adjust the light source parameters. If the parameters meet the detection requirements, the particle and gas concentrations are calculated based on the received signal, and the data is transmitted to the outside through the signal interface 13.

[0063] Therefore, the gas sensing device according to the embodiment of the present application can detect particulate matter and at least one gas substance in the air through a gas sensing device, avoiding the situation where different gas sensing devices are required to detect different gases or particulate matter, which leads to structural redundancy of light sources, air chambers, etc., reduces the size of the device, enables it to be better concealed in a small space, and the device has a long life and is inexpensive.

[0064] Combine the following Figure 6 A gas detection method according to another aspect of the present application is described. Figure 6 A schematic flow chart of a gas detection method 600 according to an embodiment of the present application is shown. The gas detection method 600 according to an embodiment of the present application may include the following steps:

[0065] In step S610, infrared light is emitted as incident light to a detection gas chamber through a laser, wherein the detection gas chamber contains a gas to be detected, and the gas to be detected contains particulate matter and gaseous substances, wherein a first portion of light in the incident light is scattered by the particulate matter to obtain scattered light;

[0066] In step S620, at least part of the scattered light is collected by a first photodiode to obtain a first signal for characterizing the intensity of the scattered light;

[0067] In step S630, a second portion of the incident light that is not scattered and not absorbed by the gaseous substance is collected by a second photodiode to obtain a second signal for characterizing the light intensity of the second portion of the light;

[0068] In step S640, the concentration of the gaseous substance is determined based on the first signal and the second signal.

[0069] In an embodiment of the present application, infrared light is emitted as incident light to the detection chamber by a laser, and the detection chamber contains a gas to be detected, which includes particulate matter and gaseous substances. The particulate matter can be fine particulate matter (i.e. PM2.5) or inhalable particulate matter (i.e. PM10) or other particulate matter, which is not specifically limited. The gaseous substance can be ozone or carbon dioxide, etc. The scattered light obtained after the particulate matter collides with the first part of the incident light, and the gaseous substance absorbs part of the incident light. At least part of the scattered light is collected by the first photodiode to obtain a first signal for characterizing the intensity of the scattered light; the second part of the incident light that is not scattered and not absorbed by the gaseous substance is collected by the second photodiode to obtain a second signal for characterizing the intensity of the second part of the light. The first signal is a detection signal of the particulate matter, and the second signal is a detection signal of the gaseous substance (i.e., the second signal is a detection signal of ozone or a detection signal of carbon dioxide).

[0070] In an embodiment of the present application, when acquiring the first signal and the second signal, it also includes: determining whether the first signal and the second signal meet the detection requirements; when the detection requirements are met, calculating the concentration of particulate matter and gaseous substances; when the detection requirements are not met, adjusting the light source parameters of the laser. Since infrared light with specific parameters is required to detect the concentration of particulate matter and gaseous substances, it is necessary to first determine whether the acquired signal meets the specific parameter requirements (that is, whether the light source parameters of the infrared light emitted by the laser in the gas sensor device described above meet the detection requirements), such as whether the signal intensity, pulse width, period and other parameters meet the detection requirements. If the detection requirements are not met, it is necessary to send an adjustment instruction to the gas sensor device to adjust the infrared light parameters emitted by the laser. Specifically, it can be adjusted by applying a voltage to the laser, the amplitude of the voltage affects the signal intensity of the infrared light, the duration of the voltage affects the pulse width of the infrared light, and the change period of the voltage affects the period of the infrared light.

[0071] In an embodiment of the present application, when the detection of the first signal and the second signal meets the requirements, the concentration of particulate matter and gaseous substances is calculated. The scattered light intensity of all scattered light is determined based on the first signal, and the concentration of particulate matter is determined based on the scattered light intensity and the first function, wherein the first function is a preset function that reflects the corresponding relationship between the scattered light intensity and the concentration of particulate matter. Specifically, the scattered light intensity value collected by the first signal is obtained by the first photodiode in the gas sensor device described above through the first operational amplifier circuit, and the first function can be obtained using the scattering law.

[0072] In this embodiment, the first function is obtained according to the scattering law. The infrared light emitted by the laser in the gas sensor device enters the detection gas chamber, and a part of the infrared light collides with the particles in the gas to be measured. The intensity of the scattering of the infrared light is related to the particle physical properties of the particles. When there are no particles in the gas to be measured, there is no obvious scattering phenomenon of the infrared light, no light is incident on the first photodiode, and no effective signal is output; when there are particles in the gas to be measured, the infrared light irradiates the particles at the outlet of the gas to be measured, and the particles are irregularly diffusely reflected to the surroundings, and light is incident on the first photodiode, generating an effective output signal (that is, the scattered light intensity value). Each particle passing through will form a pulse signal. The larger the particle, the stronger the signal. The size and number of the particles can be calculated by processing and analyzing the signal, that is, the concentration of the particles can be calculated.

[0073] In an embodiment of the present application, firstly, a predetermined proportional relationship between the scattered light intensity value corresponding to all scattered light and the scattered light intensity value of the scattered light collected by the first photodiode can be determined by calibration; the scattered light intensity value of the scattered light collected by the first photodiode is determined based on the first signal; based on the scattered light intensity value of the scattered light collected by the first photodiode and the predetermined proportional relationship, the scattered light intensity of all scattered light is determined. Among them, the predetermined proportional relationship is also the amplification factor K, which is used to compensate for the partial scattered light intensity that is not reflected by the reflector to the photosensitive surface of the first photodiode, and its value is determined by the sensor test calibration link. The K value obtained by calibration can obtain the scattered light intensity value corresponding to all scattered light, and the function obtained by the scattering law can obtain the particle concentration.

[0074] In an embodiment of the present application, the scattered light intensity of the scattered light collected by the first photodiode is determined based on the first signal, and the intensity of the second part of the light (that is, the intensity of the transmitted light) is determined based on the second signal; the concentration of the gaseous substance is determined based on the scattered light intensity of the scattered light collected by the first photodiode, the intensity of the second part of the light (that is, the intensity of the transmitted light) and a second function, wherein the second function is a preset function that reflects the correspondence between the scattered light intensity of the scattered light collected by the first photodiode, the intensity of the second part of the light (that is, the intensity of the transmitted light) and the concentration of the gaseous substance. The following is combined with Figure 7 Describes the proportional relationship between the scattered light intensity value and the transmitted light intensity value. Figure 7 As shown, specifically, the intensity of infrared light generated by the laser in the gas sensor device is fixed and unchanged. When the infrared light enters the detection gas chamber, part of the light collides with the particles in the gas to be measured to obtain scattered light, and part of the light is absorbed by the gas substance in the gas to be measured. The light that is not scattered and not absorbed is used as transmitted light. The calculation formula for the intensity of infrared light generated by the laser is as follows:

[0075] I or =KISc +I Tr +I Ab

[0076] Wherein, K is an amplification factor, which is used to compensate for the scattered light intensity that is not reflected by the reflector to the photosensitive surface, and its value is determined by the sensor test calibration link; I Sc To detect the scattered light intensity detected by the first photodiode in the gas chamber, I Tr To detect the intensity of the transmitted light detected by the second photodiode in the gas chamber, I Ab To detect the light absorption intensity of the gaseous substances in the gas to be tested in the gas chamber. Through the test and calibration of the gas sensor device, the corresponding relationship between the scattered light intensity and the concentration of inhalable particles can be known. Through the calibration process and the Mie scattering law and the Rayleigh scattering law, the amplification factor K can be calculated.

[0077] In this embodiment, when the laser in the gas sensor device is controlled by the modulation unit to emit infrared light with stable power, the total I or If the concentration of the gas substance (such as ozone or carbon dioxide) in the gas to be measured is stable, then I Ab The value remains unchanged. At this time, I Sc and I Tr Form a proportional relationship (that is, an inverse proportional relationship), such as Figure 7 As shown, when the scattered light intensity I Sc When the transmitted light intensity I Tr correspondingly decreases, and vice versa. Tr ,I Sc ) determines that the current transmitted light intensity and scattered light intensity are located on a specific inverse proportional relationship curve. When the gas concentration is stable, the coordinate (I Tr ,I Sc ) only moves on the inverse proportional relationship curve corresponding to the concentration. For example, when the gas concentration is high, (I Tr ,I Sc ) moves on the inverse proportional relationship curve corresponding to the high concentration gas. Figure 7 The proportional relationship diagram shows that when the concentration of gas substance is higher, (I Tr ,I Sc ) is closer to the origin of the coordinate system. The relationship between the position of different curves and the concentration of gas substances can be determined through the calibration experiment link. It can be seen that when the first signal and the second signal transmitted to the first operational amplifier circuit and the second operational amplifier circuit by the first photodiode and the second photodiode in the gas sensor device are obtained, the scattered light intensity and the transmitted light intensity are obtained, and the inverse proportional relationship curve corresponding to the scattered light intensity and the transmitted light intensity can be determined. Different inverse proportional relationship curves correspond to different concentrations of gas substances, so if the curve is known, the concentration of the gas substance can be obtained.

[0078] Combine the following Figure 8 A gas detection method 800 according to another embodiment of the present application is described, which focuses on the operation of the gas detection device. Figure 8 As shown, firstly, step S01 is executed, the laser is controlled by the modulation unit to emit infrared light with a specific wavelength, pulse width, frequency and intensity; secondly, step S02 is executed, the infrared light enters the detection chamber as incident light through the collimating lens, and converges at the reflector in the detection chamber; then step S03 is executed, in the detection chamber, part of the incident light collides with particulate matter (PM2.5 particles) and is scattered, and part of the light is absorbed by the gas after passing through the detection chamber; then step S04 / S05 is executed, the scattered light is converged by the reflector in the detection chamber and enters the photodiode on the opposite side of the reflector; then step S06 / S07 is executed, the incident light that is not scattered or absorbed is collected by another photodiode as transmitted light; then step S08 is executed, the two photodiodes transmit the signal to the operational amplifier circuit, and the pre-amplifier The method further comprises the following steps: first, performing a multi-stage amplification by amplifying means such as an amplifier and a main amplifier; then executing step S09, performing noise reduction filtering on the amplified analog signal through a filtering circuit; then executing step S10, converting the filtered signal into a digital signal by an analog-to-digital signal converter (ADC) and transmitting it to a digital processing unit; then executing step S11, the digital processing unit interprets the obtained digital signal to confirm whether its intensity value, pulse width, period and other parameters meet the detection requirements; if the signal intensity, pulse width, period and other parameters do not meet the detection requirements, then executing step S12, sending an instruction to the modulation unit to adjust the light source parameters; then executing step S13, the digital processing unit respectively calculates the PM2.5 and gas (ozone) concentrations according to the received signal through a gas concentration algorithm; finally, executing step S14, the digital processing unit transmits the data to the outside through a signal interface.

[0079] Therefore, the gas detection method according to the embodiment of the present application can detect particulate matter and at least one gas substance in the air through a gas sensor device, avoiding the situation where different gas sensor devices are required to detect different gases or particulate matter, which leads to structural redundancy of light sources, air chambers, etc., reduces the size of the device, enables it to be better concealed in a small space, and the device has a long life and is inexpensive.

[0080] Combine the following Fig. 9 A gas detection device according to another aspect of the present application is described. Fig. 9 FIG. 1 shows a schematic structural block diagram of a gas detection device 900 according to an embodiment of the present application. Fig. 9As shown, the gas detection device 900 includes a memory 910 and a processor 920, wherein: the memory 910 stores a computer executable program run by the processor 920, and when the computer executable program is run by the processor 920, the processor 920 executes the aforementioned gas detection method 600. Those skilled in the art can understand the structure and specific operation of each module in the gas detection device 900 according to the embodiment of the present application in combination with the contents described above, and for the sake of brevity, they will not be repeated here. Therefore, the gas detection device according to the embodiment of the present application can detect particulate matter and at least one gas substance in the air through a gas sensor device, avoiding the situation where different gas sensor devices are required to detect different gases or particulate matter, resulting in redundancy of structures such as light sources and air chambers, reducing the size of the device, making it better to be concealed in a small space, and the device has a long life and is cheap.

[0081] In addition, according to an embodiment of the present application, a vehicle is also provided, which may include the gas sensing device 100, the gas detection device 400, the gas detection device 400, 500 or the gas detection device 900 described above.

[0082] In addition, the present application also provides a storage medium on which a computer program is stored, and when the computer program is run by a processor, the processor executes the gas detection method according to the embodiment of the present application described above. The storage medium may include, for example, a memory card of a smart phone, a storage component of a tablet computer, a hard disk of a personal computer, a read-only memory (ROM), an erasable programmable read-only memory (EPROM), a portable compact disk read-only memory (CD-ROM), a USB memory, or any combination of the above storage media. The computer-readable storage medium may be any combination of one or more computer-readable storage media.

[0083] Based on the above description, the gas sensor device, detection device, detection method and vehicle of the embodiments of the present application can detect particulate matter and at least one gas substance in the air through a gas sensor device, avoiding the situation where different gas sensor devices are required to detect different gases or particulate matter, resulting in structural redundancy such as light sources and air chambers, reducing the size of the device, making it better concealed in a small space, and the device has a long life and is inexpensive.

[0084] Although example embodiments have been described herein with reference to the accompanying drawings, it should be understood that the above example embodiments are merely exemplary and are not intended to limit the scope of the present application to this. Those of ordinary skill in the art may make various changes and modifications therein without departing from the scope and spirit of the present application. All these changes and modifications are intended to be included within the scope of the present application as required by the appended claims.

[0085] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0086] In the several embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic, for example, the division of the units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another device, or some features can be ignored or not executed.

[0087] In the description provided herein, a large number of specific details are described. However, it is understood that the embodiments of the present application can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0088] Similarly, it should be understood that in order to streamline the present application and help understand one or more of the various inventive aspects, in the description of the exemplary embodiments of the present application, the various features of the present application are sometimes grouped together into a single embodiment, figure, or description thereof. However, the method of the present application should not be interpreted as reflecting the following intention: the claimed application requires more features than the features clearly stated in each claim. More specifically, as reflected in the corresponding claims, the inventive point is that the corresponding technical problem can be solved with features less than all the features of a single disclosed embodiment. Therefore, the claims following the specific embodiment are hereby explicitly incorporated into the specific embodiment, wherein each claim itself serves as a separate embodiment of the present application.

[0089] It will be understood by those skilled in the art that, except for mutually exclusive features, all features disclosed in this specification (including the accompanying claims, abstracts and drawings) and all processes or units of any method or device disclosed in this specification may be combined in any combination. Unless otherwise expressly stated, each feature disclosed in this specification (including the accompanying claims, abstracts and drawings) may be replaced by an alternative feature that provides the same, equivalent or similar purpose.

[0090] In addition, those skilled in the art will appreciate that, although some embodiments described herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present application and form different embodiments. For example, in the claims, any one of the claimed embodiments may be used in any combination.

[0091] The various component embodiments of the present application can be implemented in hardware, or implemented in software modules running on one or more processors, or implemented in a combination thereof. It should be understood by those skilled in the art that a microprocessor or digital signal processor (DSP) can be used in practice to implement some or all functions of some modules according to the embodiments of the present application. The application can also be implemented as a part or all of a program (e.g., a computer program and a computer program product) for performing the method described herein. Such a program implementing the present application can be stored on a computer-readable medium, or can have the form of one or more signals. Such a signal can be downloaded from an Internet website, or provided on a carrier signal, or provided in any other form.

[0092] It should be noted that the above embodiments illustrate the present application rather than limit the present application, and that those skilled in the art may design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference symbol between brackets should not be constructed as a limitation to the claims. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "one" or "an" preceding an element does not exclude the presence of a plurality of such elements. The present application may be implemented by means of hardware comprising a number of different elements and by means of a suitably programmed computer.

[0093] The above is only a specific implementation or description of a specific implementation of the present application, and the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. The protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A gas sensing device, characterized in that: The device comprises a laser, a detection gas chamber, a first photodiode, and a second photodiode, wherein: The detection gas chamber is used to contain the gas to be detected, and the gas to be detected contains particulate matter and gaseous substances; The laser is used to emit infrared light, and the infrared light enters the detection chamber as incident light, and a first portion of the incident light is scattered by the particles to obtain scattered light; The first photodiode is adapted to collect at least a portion of the scattered light; The second photodiode is suitable for collecting a second portion of the incident light that is not scattered and not absorbed by the gas substance.

2. The device according to claim 1, characterized in that A reflector is disposed in the detection air chamber, the first photodiode is disposed at twice the focal length of the reflector, and at least a portion of the scattered light is reflected to the first photodiode by the reflector.

3. The device according to claim 1, characterized in that The second photodiode and the laser are arranged along the same axis.

4. The device according to claim 1, characterized in that The gas substance includes ozone, and the laser includes a first laser that emits a first infrared light.

5. The device according to claim 1, characterized in that The gaseous substance includes carbon dioxide, and the laser includes a second laser that emits a second infrared light.

6. The device according to claim 1, characterized in that The gas substance includes ozone and carbon dioxide, the laser includes a first laser and a second laser, the first laser emits a first infrared light, the second laser emits a second infrared light, and the number of the second photodiodes is at least two, wherein: The light in the second part of light corresponding to the first infrared light is collected by one of the second photodiodes, and the light in the second part of light corresponding to the second infrared light is collected by another of the second photodiodes, wherein the value of the wavelength range of the first infrared light is greater than the value of the wavelength range of the second infrared light.

7. The device according to claim 4 or 6, characterized in that The wavelength of the first infrared light emitted by the first laser is in the range of 9100 nm to 10000 nm.

8. The device according to claim 5 or 6, characterized in that The wavelength of the second infrared light emitted by the second laser is in the range of 4160 nm to 4350 nm.

9. The device according to claim 1, characterized in that The device also includes a blower, which is used to transport the gas to be tested to the detection gas chamber.

10. The device according to claim 1, characterized in that The device also includes a collimating lens unit, and the infrared light emitted by the laser passes through the collimating lens unit and enters the detection gas chamber as the incident light.

11. The device according to claim 1, characterized in that The device further comprises a modulation unit, and the laser emits the infrared light under modulation of the modulation unit.

12. The device according to claim 1, characterized in that The device further comprises a first operational amplifier circuit and a second operational amplifier circuit, wherein: The first photodiode outputs a first electrical signal based on the collected light, the first operational amplifier circuit is used to amplify the first electrical signal, and the first electrical signal is used to detect the intensity of the scattered light; The second photodiode outputs a second electrical signal based on the collected light, the second operational amplifier circuit is used to amplify the second electrical signal, and the second electrical signal is used to detect the light intensity of the second portion of light.

13. A gas detection device, characterized in that: The device comprises: a gas sensing device and a signal processing device, wherein: The gas sensor device is communicatively connected with the signal processing device, and the gas sensor device is the gas sensor device described in any one of claims 1 to 12; The signal processing device is used to process the output signal of the gas sensor device to obtain a detection result.

14. The device according to claim 13, characterized in that The signal processing device comprises an analog-to-digital signal converter and a digital processing unit, wherein: The analog-to-digital signal converter is used to convert the analog output signal of the gas sensor device into a digital signal; The digital processing unit is used to obtain the detection result based on the digital signal.

15. The device according to claim 14, characterized in that The digital processing unit is also connected to the fan and the modulation unit in the gas sensor device, and is used to control the fan, and control the laser by controlling the modulation unit.

16. A gas detection method, characterized in that: The method comprises: Emittering infrared light as incident light to a detection gas chamber through a laser, wherein the detection gas chamber contains a gas to be detected, and the gas to be detected contains particulate matter and gaseous substances, wherein a first portion of light in the incident light is scattered by the particulate matter to obtain scattered light; Collecting at least part of the scattered light by a first photodiode to obtain a first signal for characterizing the intensity of the scattered light; collecting, by a second photodiode, a second portion of light in the incident light that is not scattered and not absorbed by the gas substance, to obtain a second signal for characterizing the light intensity of the second portion of light; Based on the first signal and the second signal, a concentration of the gaseous species is determined.

17. The method according to claim 16, characterized in that The method further includes determining a concentration of the particulate matter based on the first signal.

18. The method according to claim 17, characterized in that Determining the concentration of the particulate matter based on the first signal includes: The scattered light intensity of all scattered light is determined based on the first signal, and the concentration of the particulate matter is determined based on the scattered light intensity and a first function, wherein the first function is a preset function that reflects the corresponding relationship between the scattered light intensity and the concentration of the particulate matter.

19. The method according to claim 18, characterized in that Determining the scattered light intensity of all scattered light based on the first signal includes: Determining, by calibration, a predetermined proportional relationship between the scattered light intensity value corresponding to all scattered light and the scattered light intensity value of the scattered light collected by the first photodiode; determining a scattered light intensity value of the scattered light collected by the first photodiode based on the first signal; Based on the scattered light intensity value of the scattered light collected by the first photodiode and the predetermined proportional relationship, the scattered light intensity of all the scattered light is determined.

20. The method according to claim 16, characterized in that The determining the concentration of the gaseous substance based on the first signal and the second signal comprises: determining the scattered light intensity of the scattered light collected by the first photodiode based on the first signal, and determining the light intensity of the second portion of light based on the second signal; The concentration of the gas substance is determined based on the scattered light intensity of the scattered light collected by the first photodiode, the intensity of the second part of the light, and a second function, wherein the second function is a preset function that reflects the correspondence between the scattered light intensity of the scattered light collected by the first photodiode, the intensity of the second part of the light, and the concentration of the gas substance.

21. The method according to claim 16, characterized in that The gas substance is ozone or carbon dioxide.

22. The method according to claim 16, characterized in that After acquiring the first signal and the second signal, the method further includes: Determining whether the first signal and the second signal meet detection requirements; When the detection requirements are met, calculating the concentrations of the particulate matter and the gaseous substance; When the detection requirement is not met, the light source parameters of the laser are adjusted.

23. A gas detection device, characterized in that: The device includes a memory and a processor, wherein the memory stores a computer executable program executed by the processor, and when the computer executable program is executed by the processor, the processor executes the gas detection method according to any one of claims 16 to 22.

24. A storage medium, characterized in that The storage medium stores a computer program executed by a processor, and when the computer program is executed by the processor, the processor executes the gas detection method according to any one of claims 16 to 22.

25. A vehicle, characterized in that: The vehicle comprises a gas sensing device as claimed in any one of claims 1-12 or a gas detection device as claimed in any one of claims 13-15.

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