Multi-detector combustible gas distribution reconstruction device and method

Abstract

The invention relates to the technical field of combustible gas leakage detection, in particular to a multi-detector combustible gas distribution reconstruction device and method, and the device comprises a mobile carrier; the plurality of rotating platforms are arranged on the movable carrier; the detection assemblies are arranged on the rotating platforms and used for emitting light beams to the detection points of the target area and detecting current signals of diffuse reflection light of the detection points of the target area; the processing unit is arranged on the moving carrier and used for changing the orientation of the multiple rotating platforms to obtain concentration integral information of the different light paths and reconstructing combustible gas distribution of the target area according to the concentration integral information of the different light paths, and the concentration integral information comprises a concentration integral value calculated according to the current signal of each detection assembly. Therefore, the problems that leakage area information is difficult to grasp in the leakage detection and emergency process in the prior art, the system depends on advanced arrangement and cannot move, the number of detection light paths is small, and the detection process is neglected by only considering reconstruction and optimization algorithms are solved.

Description

Technical Field

[0001] This application relates to the technical field of flammable gas leakage detection, and particularly relates to a multi-detector flammable gas distribution reconstruction device and method. Background Art

[0002] In the field of flammable gas leakage detection, existing devices mainly include in-situ gas detectors for measuring and determining points or optical telemetry detectors. The in-situ detectors are difficult to obtain leakage range information due to their small coverage area, while the telemetry detectors cannot obtain the concentration values at specific positions, making it impossible to distinguish the differences in leakage concentrations at different positions, resulting in difficulty in mastering leakage area information during leakage detection and emergency response. Some existing technologies consider using laser telemetry detectors to achieve the reconstruction of gas concentration distribution, but there are the following problems: relying on pre-deployment and being immovable, having few detection optical paths, and only considering reconstruction and optimization algorithms while ignoring the detection process. Summary of the Invention

[0003] This application provides a multi-detector flammable gas distribution reconstruction device and method to solve the problems in the prior art that it is difficult to master leakage area information during leakage detection and emergency response, relying on pre-deployment and being immovable, having few detection optical paths, and only considering reconstruction and optimization algorithms while ignoring the detection process.

[0004] In a first aspect embodiment of this application, a multi-detector flammable gas distribution reconstruction device is provided, including: a mobile vehicle; a plurality of rotating platforms arranged on the mobile vehicle; a detection component arranged on each rotating platform for emitting a light beam towards a detection point in a target area and detecting the current signal of the diffuse reflected light of the detection point in the target area; a processing unit arranged on the mobile vehicle for changing the orientations of the plurality of rotating platforms to obtain concentration integration information of different optical paths and reconstructing the flammable gas distribution in the target area according to the concentration integration information of different optical paths, where the concentration integration information includes the concentration integration value calculated according to the current signal of each detection component.

[0005] Optionally, when detecting each detection point in the target area, the plurality of rotating platforms simultaneously face the same detection point, and each detection point corresponds to the concentration integration information of one optical path.

[0006] Optionally, the detection component includes a light source, a photodetector, and a convex lens arranged in front of the photodetector.

[0007] Optionally, the rotating platform includes a platform body and a motor, where the motor drives the platform body to rotate according to the target rotation parameters.

[0008] Optionally, the target rotation parameters include a target rotation direction, a target angle, and a target speed.

[0009] Optionally, the signals output by the processing unit include digital signals with rising edges for multi-channel motor drive, DAC analog signal output, current drive signals, multi-channel signal amplification, and ADC analog signals.

[0010] In the second aspect of the embodiments of the present application, a method for reconstructing the distribution of combustible gas by multiple detectors is provided. The method uses the device for reconstructing the distribution of combustible gas by multiple detectors in the first aspect to reconstruct the distribution of combustible gas, and includes the following steps: obtaining multiple detection points in the target area; controlling multiple rotating platforms to emit light beams towards the detection points in the target area; detecting the current signals of the diffusely reflected light at the detection points in the target area, and generating the concentration integration information of one optical path according to the concentration integration values calculated from the current signals of each detection component; changing the orientations of the multiple rotating platforms to obtain the concentration integration information of different optical paths, and reconstructing the distribution of combustible gas in the target area according to the concentration integration information of different optical paths.

[0011] Optionally, generating the concentration integration information of one optical path according to the concentration integration values calculated from the current signals of each detection component includes: inputting the current signals of each detection component into a harmonic signal processing algorithm, and the harmonic signal processing algorithm outputs the concentration integration values of each detection component, and generating the concentration integration information of one optical path according to the concentration integration values of each detection component.

[0012] Optionally, reconstructing the distribution of combustible gas in the target area according to the concentration integration information of different optical paths includes: inputting the concentration integration information of different optical paths into the maximum likelihood expectation maximization algorithm, and the maximum likelihood expectation maximization algorithm outputs the distribution of combustible gas in the target area.

[0013] Optionally, the calculation process of the maximum likelihood expectation maximization algorithm includes: obtaining the relationship matrix between the concentration integration value and the gas concentration distribution and the concentration integration information; setting the initial gas concentration distribution and the iteration threshold of the relationship matrix, and iteratively updating the gas concentration distribution according to the relationship matrix, the concentration integration information, and the current gas concentration distribution, where, when iteratively updating the gas concentration distribution for the first time, the current gas concentration distribution is the initial gas concentration distribution, and when iteratively updating the gas concentration distribution for non-first time, the current gas concentration distribution is the gas concentration distribution after the previous iterative update; if the difference between the iteratively updated gas concentration distribution and the current gas concentration distribution is greater than the iteration threshold, stop the iteration, and use the gas concentration distribution after the last iterative update as the distribution of combustible gas in the target area.

[0014] Therefore, the present application has the following beneficial effects:

[0015] In the embodiments of the present application, by arranging a plurality of rotating platforms on a mobile vehicle, and arranging detection components on each rotating platform, the detection components emit light beams towards the detection points in the target area to detect the current signals of the diffusely reflected light of the detection points in the target area. The processing unit arranged on the mobile vehicle is used to change the orientations of the plurality of rotating platforms, so as to obtain the concentration integration information of different optical paths. Finally, according to the concentration integration information of different optical paths, the distribution of combustible gas in the target area is reconstructed, realizing movable measurement. By using the ground diffuse reflection method, the detection optical paths can be arranged, increased and adjusted at any time, and at the same time, the ability to measure the concentration distribution in the non-mobile state is realized. Thereby, the problems in the prior art that it is difficult to master the information of the leakage area during the leakage detection and emergency process, rely on the pre-arranged and immovable detection optical paths, have few detection optical paths, and only consider the reconstruction and optimization algorithms while ignoring the detection process are solved.

[0016] Additional aspects and advantages of the present application will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the following description of the embodiments in conjunction with the accompanying drawings, where:

[0018] Figure 1 FIG. is a schematic structural diagram of a multi-detector combustible gas distribution reconstruction device according to an embodiment of the present application;

[0019] Figure 2 FIG. is a schematic diagram of a combustible gas distribution reconstruction device with 3 photodetectors according to an embodiment of the present application;

[0020] Figure 3 FIG. is a flowchart of a measurement process and signal processing according to an embodiment of the present application;

[0021] Figure 4 FIG. is a schematic diagram of a concentration integration value solving algorithm according to an embodiment of the present application;

[0022] Figure 5 FIG. is a schematic diagram of a relationship matrix between the concentration integration value and the concentration distribution according to an embodiment of the present application;

[0023] Figure 6 FIG. is a flowchart of calculating the concentration distribution by the maximum likelihood expectation maximization algorithm according to an embodiment of the present application;

[0024] Figure 7 FIG. is a schematic flowchart of a multi-detector combustible gas distribution reconstruction method according to an embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] Embodiments of the present application will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present application and should not be construed as limiting the present application.

[0026] The multi-detector combustible gas distribution reconstruction device and method according to embodiments of the present application will be described below with reference to the accompanying drawings. In view of the problems in the prior art mentioned in the above background art that it is difficult to grasp the information of the leakage area during the leakage detection and emergency process, it depends on the pre-laid and immovable devices, there are few detection optical paths, and only the reconstruction and optimization algorithms are considered while ignoring the detection process, etc., the present application provides a multi-detector combustible gas distribution reconstruction device. The device is provided with a plurality of rotating platforms on a mobile vehicle, and a detection component is provided on each rotating platform. The detection component emits a light beam towards the detection point in the target area and detects the current signal of the diffuse reflected light of the detection point in the target area. The processing unit provided on the mobile vehicle changes the orientations of the plurality of rotating platforms, so as to obtain the concentration integration information of different optical paths. Finally, the combustible gas distribution in the target area is reconstructed according to the concentration integration information of different optical paths, realizing movable measurement. By using the ground diffuse reflection method, the detection optical paths can be arranged, increased and adjusted at any time, and at the same time, the concentration distribution measurement ability in the non-mobile state is realized. Thus, the problems in the prior art that it is difficult to grasp the information of the leakage area during the leakage detection and emergency process, it depends on the pre-laid and immovable devices, there are few detection optical paths, and only the reconstruction and optimization algorithms are considered while ignoring the detection process, etc., are solved.

[0027] Specifically, Figure 1 is a schematic structural diagram of a multi-detector combustible gas distribution reconstruction device provided by an embodiment of the present application.

[0028] As Figure 1 shown, the multi-detector combustible gas distribution reconstruction device includes: a mobile vehicle 101, a plurality of rotating platforms 102, a detection component 103, and a processing unit 104.

[0029] Among them, the plurality of rotating platforms 102 are arranged on the mobile vehicle 101; the detection component 103 is arranged on each rotating platform 102 and is used to emit a light beam towards the detection point in the target area and detect the current signal of the diffuse reflected light of the detection point in the target area; the processing unit 104 is arranged on the mobile vehicle 101 and is used to change the orientations of the plurality of rotating platforms 102 to obtain the concentration integration information of different optical paths, and reconstruct the combustible gas distribution in the target area according to the concentration integration information of different optical paths, where the concentration integration information includes the concentration integration value calculated according to the current signal of each detection component 103.

[0030] It can be understood that in the embodiments of the present application, by arranging a plurality of rotating platforms 102 on the mobile vehicle 101 and placing the detection components 103 on the plurality of rotating platforms 102, the detection components 103 can change their orientations as the rotating platforms 102 rotate, so as to align and emit a light beam towards the detection points in the target area, and detect the current signal of the diffusely reflected light of the detection points in the target area. At the same time, the processing unit 104 arranged on the mobile vehicle 101 is used to control and change the orientations of the rotating platforms 102, so that the detection components 103 can detect different target areas, obtain the concentration integration information of different optical paths, and thus reconstruct the distribution of combustible gas in the target area according to the concentration integration information of different optical paths.

[0031] In the embodiments of the present application, when detecting each detection point in the target area, the plurality of rotating platforms 102 face the same detection point simultaneously, and each detection point corresponds to the concentration integration information of one optical path.

[0032] It can be understood that when the plurality of rotating platforms 102 in the embodiments of the present application detect each detection point in the target area, they need to face the same detection point simultaneously for measurement to ensure obtaining more accurate and reliable information.

[0033] In the embodiments of the present application, the detection component 103 includes a light source, a photodetector, and a convex lens arranged in front of the photodetector.

[0034] Among them, the light source is a distributed feedback laser light source, which needs to be able to adjust the wavelength and power according to the change of the current magnitude, and at the same time has a temperature control module to control the working temperature of the light source; the photodetector can convert the laser radiation diffusely reflected by the distant ground or wall into a current signal for measurement.

[0035] It can be understood that the detection component 103 in the embodiments of the present application includes a light source, a photodetector, and a convex lens arranged in front of the photodetector. The photodetector can convert the laser radiation diffusely reflected by the distant ground or wall into a current signal for measurement, and a convex lens is arranged in front of the photodetector, so that more powerful diffusely reflected light can be collected.

[0036] In the embodiments of the present application, the rotating platform 102 includes a platform body and a motor. Among them, the motor drives the platform body to rotate according to the target rotation parameters.

[0037] Among them, the motor is a stepper motor; the target rotation parameters will be described in detail below and will not be elaborated here.

[0038] It can be understood that the rotating platform 102 in the embodiments of the present application includes a platform body and a stepper motor. The stepper motor drives the platform body to rotate by obtaining the target rotation parameters, so that the platform body can face the target area.

[0039] In the embodiments of the present application, the target rotation parameters include the target rotation direction, the target angle, and the target speed.

[0040] It can be understood that in the embodiments of the present application, the motor can be controlled by target parameters such as the target rotation direction, the target angle, and the target speed, so as to drive the rotating platform 102 to rotate to the required angle and detect the target area.

[0041] In the embodiments of the present application, the signals output by the processing unit 104 include the rising-edge digital signals for multi-channel motor drive, the DAC analog signal output and the current drive signal, and the multi-channel signal amplification and ADC analog signals.

[0042] Among them, the rising-edge digital signals for multi-channel motor drive are digital signals, which usually appear as the sudden jump of the voltage from a low level to a high level in the circuit and are used to control the stepper motor; the DAC is a digital-to-analog converter, whose function is to convert digital signals into analog signals, connect to the laser driver and connect to the light source; the ADC is an analog-to-digital converter, which can convert the analog current signal received from the photodetector into a voltage signal after passing through a transimpedance amplifier and then convert it into a digital signal.

[0043] It can be understood that the processing unit 104 controls the rotation of the stepper motor through the rising-edge digital signals for multi-channel motor drive to adjust the directions of the light source and the photodetector; at the same time, the DAC analog signal output and the current drive signal are used as the voltage source of the light source modulation signal, and this voltage signal is connected to the laser driver and finally controls the light source. When the light emitted by the light source passes through the gas in the detection area and is diffusely reflected by the ground and then passes through the gas again and finally reaches the photodetector, the detector converts the received optical signal into an electric current signal, and then converts it into a multi-channel signal amplification signal through a transimpedance amplifier, which is received by the ADC and converted into a digital signal for further data analysis and processing.

[0044] According to the multi-detector combustible gas distribution reconstruction device proposed by the embodiments of the present application, by setting a plurality of rotating platforms on a mobile vehicle, and setting detection components on each rotating platform, the detection components emit light beams towards the detection points in the target area, detect the current signals of the diffusely reflected light of the detection points in the target area, and use the processing unit arranged on the mobile vehicle to change the orientations of the plurality of rotating platforms, so as to obtain the concentration integration information of different optical paths. Finally, according to the concentration integration information of different optical paths, the combustible gas distribution in the target area is reconstructed, realizing mobile measurement. By using the ground diffuse reflection method, the detection optical paths can be arranged, increased, and adjusted at any time, and at the same time, the concentration distribution measurement ability in the non-mobile state is realized.

[0045] The multi-detector combustible gas distribution reconstruction device will be further described below through a specific embodiment.

[0046] This embodiment is a gas concentration distribution reconstruction device and detection technology using an optoelectronic telemetry method. The technical principle is as Figure 2 shown, including: a light source 1, a photodetector 2, a mechanical control unit 3, a signal processing unit 4, and a vehicle unit 5. The following will describe these parts in detail respectively:

[0047] 1. Light source

[0048] The light source 1 used in this embodiment is a distributed feedback (DFB) laser light source. The central wavelength of the light source 1 is 1653.7 nm, and the maximum output power is 10 mW. The light source needs to be able to achieve wavelength and power adjustment according to the change of current magnitude, and at the same time has a temperature control module to control the working temperature of the light source.

[0049] 2. Photodetector

[0050] The photodetector 2 is used to convert the laser radiation diffusely reflected by the distant ground or wall into an electric current signal for measurement. In principle, 3 or more photodetectors 2 should be used for measurement. The photodetector 2 used in this embodiment is an indium gallium arsenide photodetector, and the measurable wavelength range is 500 - 1700 nm. There is a band-pass filter in front of each photodetector 2 to select the light with a central wavelength near 1653.7 nm. At the same time, there is a convex lens in front of the filter, with a diameter of 76.2 mm, for collecting more powerful diffusely reflected light.

[0051] 3. Mechanical control unit

[0052] The mechanical control unit 3 uses an electric rotating platform driven by a stepper motor, including stepper motor drive for controlling the rotation direction, angle, and speed.

[0053] 4. Signal processing unit

[0054] The signal processing unit 4 serves as the main control of the detection device, including K-channel motor-driven rising-edge digital signal output, 1-channel DAC analog signal output and current drive, K-channel signal amplification and ADC analog signal input, where K is the number of photodetectors 2. The DAC serves as the voltage modulation source of the light source modulation signal to output a signal connected to the laser driver and then connected to the light source 1. The received current of the photodetector 2 is converted into a voltage signal after passing through a cross-group amplifier and received by the ADC for corresponding processing. The specific processing process is described below.

[0055] 5. Vehicle unit

[0056] The vehicle unit 5 provides a platform for the above-mentioned units, supports the overall movement of the device, and provides a 10-degree inclination for the optical path plane to utilize the diffusely reflected signal on the ground.

[0057] The following is the connection relationship and signal processing process of each part:

[0058] The signal processing unit 4 sends a signal to make the mechanical control unit turn by an appropriate angle, so that the light source 1 and the photodetector 2 face the diffuse reflection point 1. The signal processing unit 4 drives the light source 1. The emitted light passes through the gas in the detection area, undergoes diffuse reflection on the ground, passes through the gas in the detection area again, and returns to the K photodetectors 2. The optical signal is affected by the characteristic absorption of the gas in the two passes of the gas, resulting in attenuation of the light intensity. It is received by the photodetector 2, amplified and recorded by the signal processing unit 4, and K concentration integral values are obtained through the harmonic signal processing algorithm. The signal processing unit 4 sends a signal to make the mechanical control unit point to a new diffuse reflection point, and repeats until the signals in the direction from the diffuse reflection point 1 to the diffuse reflection point N are all measured.

[0059] Using the reconstruction algorithm, the gas concentration distribution is calculated by using the above concentration integral values and the relationship matrix, as Figure 3 shown, including the following steps:

[0060] Step S201: Set the diffuse reflection point.

[0061] Step S202: Control the light source and the detector to point to the next diffuse reflection point.

[0062] Step S203: Collect the measurement signals of the photodetector.

[0063] Step S204: Calculate and record the concentration integral value.

[0064] Step S205: Determine whether all the diffuse reflection points have been measured. If all have been completed, go to step S206; if not, return to step S202.

[0065] Step S206: Reconstruct to obtain the gas concentration distribution.

[0066] The following are the harmonic signal processing and reconstruction algorithms, specifically as follows:

[0067] 1) Generate a light source modulation signal, as Figure 4 shown;

[0068] 2) For each different light source and detector orientation, calculate the concentration integral value, as Figure 4 shown;

[0069] 3) Calculate the relationship matrix between the concentration integral value and the concentration distribution according to the detection area and the light source and detector orientation, as Figure 5 shown;

[0070] 4) Use the maximum likelihood expectation maximization algorithm to calculate the concentration distribution, as Figure 6 shown, including the following steps:

[0071] Step S301, input the element a of the relationship matrix i,j , the concentration integral value S i .

[0072] Step S302, set the initial gas distribution for iteration and the iteration threshold TH.

[0073] Step S303, record the current distribution as

[0074] Step S304, calculate k i,j = a i,j C j S i / ∑ m a i,m C m .

[0075] Step S305, calculate C new,j = ∑ i k i,j / ∑ i a i,j .

[0076] Step S306, update the distribution to

[0077] Step S307, judge whether it is less than TH. If it is less than, execute Step S308; if it is not less than, return to execute Step S303.

[0078] Step S308, output as the gas concentration distribution.

[0079] Next, describe the multi-detector combustible gas distribution reconstruction method according to the embodiments of the present application with reference to the accompanying drawings.

[0080] Figure 7 is a block diagram of the multi-detector combustible gas distribution reconstruction method according to the embodiments of the present application.

[0081] As Figure 7 shown, the multi-detector combustible gas distribution reconstruction method includes the following steps:

[0082] In Step S401, obtain multiple detection points in the target area.

[0083] It can be understood that the embodiments of the present application can obtain multiple detection points to be detected in the target area.

[0084] In Step S402, control multiple rotating platforms to emit light beams towards the detection points in the target area.

[0085] It can be understood that in the embodiments of the present application, the processing unit controls the motor to drive multiple rotating platforms to rotate and emit light beams towards the detection points in the target area.

[0086] In step S403, the current signal of the diffusely reflected light of the detection points in the target area is detected, and the concentration integration information of one optical path is generated according to the concentration integration value calculated from the current signal of each detection component.

[0087] It can be understood that in the embodiments of the present application, at each detection point in the target area, the detection component receives the laser beam diffusely reflected back, converts this optical signal into a current signal, and the processing unit processes these current signals to generate the concentration integration information representing the cumulative effect of the gas concentration on this path. The specific processing method will be described in detail below and will not be elaborated here.

[0088] In the embodiments of the present application, the concentration integration information of one optical path is generated according to the concentration integration value calculated from the current signal of each detection component, including: inputting the current signal of each detection component into the harmonic signal processing algorithm, the harmonic signal processing algorithm outputs the concentration integration value of each detection component, and the concentration integration information of one optical path is generated according to the concentration integration value of each detection component.

[0089] Among them, the harmonic signal processing algorithm is a method for analyzing the signal change after the modulated laser passes through gas absorption, and can extract useful information related to the gas concentration from complex signals.

[0090] It can be understood that in the embodiments of the present application, after the detection component receives the laser diffusely reflected from the target area and converts it into a current signal, the current signal is input into the harmonic signal processing algorithm for analysis. The harmonic signal processing algorithm processes the current signal, calculates the concentration integration value corresponding to each detection component from it, and generates the concentration integration information of one optical path according to the concentration integration value of each detection component.

[0091] In step S404, the orientations of the multiple rotating platforms are changed to obtain the concentration integration information of different optical paths, and the distribution of combustible gas in the target area is reconstructed according to the concentration integration information of different optical paths.

[0092] It can be understood that in the embodiments of the present application, by adjusting the directions of the multiple rotating platforms, the light sources and detectors on each platform can be directed to different detection points in the target area, so as to obtain the concentration integration information under multiple different optical paths, and reconstruct the concentration distribution of combustible gas in the entire target area. The reconstruction method will be described in detail below and will not be elaborated here.

[0093] In the embodiments of the present application, reconstructing the combustible gas distribution in the target area according to the concentration integration information of different optical paths includes: inputting the concentration integration information of different optical paths into the maximum likelihood expectation maximization algorithm, and the maximum likelihood expectation maximization algorithm outputs the combustible gas distribution in the target area.

[0094] Among them, the maximum likelihood expectation maximization algorithm is an iterative optimization algorithm that can estimate model parameters by maximizing the likelihood function to obtain the most likely solution, which will be described in detail below and will not be elaborated here.

[0095] It can be understood that the embodiments of the present application provide the obtained concentration integration information of different optical paths as input to the maximum likelihood expectation maximization algorithm. This algorithm can use these data for iterative calculation to obtain the distribution of combustible gas in the target area, and can achieve accurately depicting the gas concentration change even in a complex environment.

[0096] In the embodiments of the present application, the calculation process of the maximum likelihood expectation maximization algorithm includes: obtaining the relationship matrix between the concentration integration value and the gas concentration distribution and the concentration integration information; setting the initial gas concentration distribution and the iteration threshold of the relationship matrix, and iteratively updating the gas concentration distribution according to the relationship matrix, the concentration integration information and the current gas concentration distribution. Among them, when iteratively updating the gas concentration distribution for the first time, the current gas concentration distribution is the initial gas concentration distribution, and when iteratively updating the gas concentration distribution for non-first time, the current gas concentration distribution is the gas concentration distribution after the previous iteration update; if the difference between the iteratively updated gas concentration distribution and the current gas concentration distribution is greater than the iteration threshold, stop the iteration, and take the gas concentration distribution after the last iteration update as the combustible gas distribution in the target area.

[0097] Among them, the relationship matrix describes the mapping relationship between the concentration integration values of different optical paths and the gas concentration distribution in the target area; the initial gas concentration distribution is obtained through measurement; the iteration threshold is specifically set according to the actual situation and will not be specifically limited here.

[0098] It can be understood that the embodiments of the present application first obtain the concentration integration information of different optical paths and the relationship matrix between the concentration integration value and the gas concentration distribution, set the initial gas concentration distribution and the iteration threshold according to the actual situation, and then the algorithm enters the iterative process. In each iteration, the relationship matrix and the concentration integration information are used to update the gas concentration distribution, that is, the first iteration is based on the initial gas concentration distribution, and each subsequent iteration is updated based on the previous result. When the difference between the iteratively updated gas concentration distribution and the current gas concentration distribution is greater than the iteration threshold, stop the iteration, and take the gas concentration distribution obtained in the last iteration as the actual distribution of the combustible gas in the target area to be sought.

[0099] It should be noted that the foregoing explanation of the embodiments of the multi-detector combustible gas distribution reconstruction device also applies to the multi-detector combustible gas distribution reconstruction method of this embodiment, and will not be elaborated here.

[0100] The multi-detector combustible gas distribution reconstruction device proposed according to the embodiments of the present application sets a plurality of rotating platforms on a mobile vehicle, and a detection component is arranged on each rotating platform. The detection component emits a light beam towards the detection points in the target area to detect the current signal of the diffuse reflection light of the detection points in the target area. The processing unit arranged on the mobile vehicle is used to change the orientations of the plurality of rotating platforms, so as to obtain the concentration integration information of different optical paths. Finally, the combustible gas distribution in the target area is reconstructed according to the concentration integration information of different optical paths, realizing mobile measurement. The detection optical path can be arranged, increased and adjusted at any time by using the ground diffuse reflection method, and at the same time, the concentration distribution measurement ability in the non-mobile state is realized.

[0101] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or N embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0102] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "N" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0103] Any process or method description shown in the flowchart or described in other ways herein can be understood as representing a module, segment, or part of code including one or N executable instructions for implementing a customized logical function or process. The scope of the preferred embodiments of the present application includes additional implementations, where the functions can be executed in a substantially simultaneous manner or in a reverse order according to the involved functions, rather than in the order shown or discussed, which should be understood by those skilled in the art of the embodiments of the present application.

[0104] It should be understood that each part of the present application can be implemented by hardware, software, firmware, or a combination thereof. In the above embodiments, the steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, any one or a combination of the following technologies well known in the art can be used: discrete logic circuits having logic gate circuits for implementing logic functions on data signals, application specific integrated circuits having appropriate combinational logic gate circuits, programmable gate arrays, field programmable gate arrays, and the like.

[0105] Those of ordinary skill in the art can understand that all or part of the steps carried by the method for implementing the above embodiments can be completed by instructing relevant hardware through a program. The above program can be stored in a computer-readable storage medium. When the program is executed, it includes one or a combination of the steps of the method embodiments.

[0106] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present application. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present application.

Claims

1. A multi-detector combustible gas distribution reconstruction device, characterized in that: include: Mobile vehicles; A plurality of rotating platforms disposed on the mobile carrier; A detection component disposed on each rotating platform, used to emit a light beam toward a detection point in a target area and detect a current signal of diffusely reflected light from the detection point in the target area; The processing unit arranged on the mobile carrier is used to change the orientation of the multiple rotating platforms to obtain concentration integral information of different light paths, and reconstruct the combustible gas distribution in the target area according to the concentration integral information of the different light paths, wherein the concentration integral information includes a concentration integral value calculated according to the current signal of each detection component.

2. The multi-detector combustible gas distribution reconstruction device according to claim 1, characterized in that: When detecting each detection point of the target area, the multiple rotating platforms face the same detection point at the same time, and each detection point corresponds to concentration integration information of one light path.

3. The multi-detector combustible gas distribution reconstruction device according to claim 1, characterized in that: The detection assembly comprises a light source, a photoelectric detector and a convex lens arranged in front of the photoelectric detector.

4. The multi-detector combustible gas distribution reconstruction device according to claim 1, characterized in that: The rotating platform includes a platform body and a motor, wherein the motor drives the platform body to rotate according to a target rotation parameter.

5. The multi-detector combustible gas distribution reconstruction device according to claim 4, characterized in that: The target rotation parameters include target rotation direction, target angle and target speed.

6. The multi-detector combustible gas distribution reconstruction device according to claim 1, characterized in that: The signals output by the processing unit include rising edge digital signals of multiple motor drives, DAC analog signal output and current drive signals, multiple signal amplification and ADC analog signals.

7. A multi-detector combustible gas distribution reconstruction method, characterized in that: The method uses the multi-detector combustible gas distribution reconstruction device according to any one of claims 1 to 6 to reconstruct the combustible gas distribution, wherein the method comprises the following steps: Acquire multiple detection points in the target area; Controlling a plurality of rotating platforms to emit light beams toward detection points in a target area; Detecting the current signal of diffusely reflected light at the detection point of the target area, and generating concentration integral information of one light path according to the concentration integral value calculated from the current signal of each detection component; The directions of the plurality of rotating platforms are changed to obtain concentration integration information of different light paths, and the combustible gas distribution in the target area is reconstructed according to the concentration integration information of the different light paths.

8. The multi-detector combustible gas distribution reconstruction method according to claim 7, characterized in that: The step of generating concentration integration information of a light path according to the concentration integration value calculated according to the current signal of each detection component includes: The current signal of each detection component is input into a harmonic signal processing algorithm, and the harmonic signal processing algorithm outputs a concentration integral value of each detection component, and concentration integral information of one optical path is generated according to the concentration integral value of each detection component.

9. The multi-detector combustible gas distribution reconstruction method according to claim 7, characterized in that: The reconstructing the combustible gas distribution in the target area according to the concentration integration information of the different light paths includes: The concentration integration information of the different light paths is input into a maximum likelihood expectation maximum algorithm, and the maximum likelihood expectation maximum algorithm outputs the combustible gas distribution in the target area.

10. The multi-detector combustible gas distribution reconstruction method according to claim 9, characterized in that: The calculation process of the maximum likelihood expectation maximization algorithm includes: Obtaining a relationship matrix between concentration integral value and gas concentration distribution and the concentration integral information; Setting an initial gas concentration distribution and an iteration threshold of the relationship matrix, and iteratively updating the gas concentration distribution according to the relationship matrix, the concentration integral information and the current gas concentration distribution, wherein when the gas concentration distribution is updated for the first time, the current gas concentration distribution is the initial gas concentration distribution, and when the gas concentration distribution is not updated for the first time, the current gas concentration distribution is the gas concentration distribution after the last iteration update; If the difference between the iteratively updated gas concentration distribution and the current gas concentration distribution is greater than the iteration threshold, the iteration is stopped and the gas concentration distribution after the last iterative update is used as the combustible gas distribution of the target area.

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