Dust concentration detection device and method

Abstract

The invention discloses a dust concentration detection device and method, and relates to the field of dust concentration detection.The dust concentration detection device comprises a laser assembly, a laser driving module, a laser tube optical power acquisition module, a signal acquisition module and a data processing module; the laser driving module outputs a first current according to a set driving value output by the data processing module; the laser assembly emits laser with first current to irradiate to-be-detected dust; the laser tube optical power acquisition module acquires an optical power value of the laser assembly and processes the optical power value to obtain a processed optical power value; the signal acquisition module acquires a scattered light signal of the dust to be detected and processes the scattered light signal to obtain a processed scattered light signal; and the data processing module determines the dust concentration value according to the processed scattered light signal and the processed optical power value, or determines the dust concentration value according to the processed scattered light signal. According to the invention, the accuracy of dust concentration detection is improved.

Description

Technical Field

[0001] The present application relates to the field of dust concentration detection, and in particular to a dust concentration detection device and method. Background Art

[0002] Existing laser dust sensors (hereinafter referred to as sensors) measure the concentration of dust by detecting the number of dust particles in a certain period of time (or an approximate method). Such sensors need to be equipped with a micro fan inside to control the movement speed of the dust. When the movement speed of the dust remains unchanged, the number of particles per unit time is well correlated with the mass concentration of the dust. In other words, if the number of particles per unit time is detected, the mass concentration of the dust can be calculated when the density characteristics of the material are known. The number of particles per unit time can be obtained by detecting the scattered light signal of the dust.

[0003] The above-mentioned sensor and its detection method are highly dependent on the stability of the fan performance, that is, the wind speed (or particle movement speed) in the optical measurement cavity inside the sensor must be stable. Once this stable wind speed value is no longer the set value, it will directly affect the measurement result.

[0004] However, factors such as fan damage, the air inlet and outlet of the sensor being affected by the airflow, and the fan performance decreasing due to lower temperature and lower speed will cause the wind speed in the optical measurement cavity to be unstable. The fan also has problems such as high noise and short life.

[0005] Therefore, it is a general trend to eliminate the micro fan in the sensor and directly use the wind speed of the external device. However, the wind speed in the environment is definitely not a specific or stable value, and the existing method of measuring dust particle concentration is no longer applicable. Summary of the invention

[0006] The purpose of the present application is to provide a dust concentration detection device and method, which can accurately measure the dust concentration under the condition of unstable wind speed.

[0007] To achieve the above objectives, this application provides the following solutions:

[0008] In a first aspect, the present application provides a dust concentration detection device, including: a laser component, a laser driving module, a laser tube optical power acquisition module, a signal acquisition module and a data processing module;

[0009] The laser assembly is connected to the laser driving module and the laser tube optical power collection module respectively; the laser driving module, the laser tube optical power collection module and the signal collection module are all connected to the data processing module;

[0010] The laser driving module is used to output a first current to the laser component based on the set driving value output by the data processing module;

[0011] The laser assembly is used to emit a laser beam to irradiate the dust to be detected;

[0012] The laser tube optical power acquisition module is used to acquire the optical power value of the laser component and process the optical power value to obtain the processed optical power value;

[0013] The signal acquisition module is used to collect the scattered light signal of the dust to be detected, and process the scattered light signal to obtain a processed scattered light signal;

[0014] The data processing module is used to determine the dust concentration value according to the processed scattered light signal and the processed optical power value, or to determine the dust concentration value according to the processed scattered light signal.

[0015] Optionally, the laser driving module comprises: a UI conversion unit and a constant current driving unit; the UI conversion unit is connected to the data processing module; the constant current driving unit is respectively connected to the UI conversion unit and the laser assembly;

[0016] The UI conversion unit is used to convert the set driving value into the first current, and the first current is a constant current;

[0017] The constant current driving unit is used to drive the laser component to emit laser according to the constant current.

[0018] Optionally, the laser tube optical power acquisition module includes: a first IU conversion unit and a first amplifying circuit; the first IU conversion unit is connected to the laser component; the first amplifying circuit is respectively connected to the first IU conversion unit and the data processing module;

[0019] The first IU conversion unit is used to collect the optical power value of the laser assembly and convert the optical power value into a first voltage value;

[0020] The first amplifier circuit is used to amplify the first voltage value to obtain a processed optical power value, and feed it back to the data processing module.

[0021] Optionally, the laser tube optical power acquisition module includes: a first IU conversion unit and a first bias amplifier circuit; the first IU conversion unit is connected to the laser component, the first bias amplifier circuit and the data processing module respectively; the first bias amplifier circuit is connected to the data processing module;

[0022] The first IU conversion unit is used to collect the optical power value of the laser assembly and convert the optical power value into a first voltage value;

[0023] The data processing module is used to determine a first bias setting value according to the first voltage value;

[0024] The first bias amplifier circuit is used to amplify the first voltage value based on the first bias setting value to obtain a processed optical power value, and feed it back to the data processing module.

[0025] Optionally, the laser driving module comprises: a feedback regulating unit and a current driving unit; the feedback regulating unit is respectively connected to the laser tube optical power acquisition module and the data processing module; the current driving unit is respectively connected to the feedback regulating unit and the laser assembly;

[0026] The feedback adjustment unit is used to output the first current according to the set driving value and the processed optical power value;

[0027] The current driving unit is used to drive the laser component to emit laser light with constant optical power according to the first current.

[0028] Optionally, the laser tube optical power acquisition module includes: a first IU conversion unit and a first amplifying circuit; the first IU conversion unit is connected to the laser component; the first amplifying circuit is respectively connected to the first IU conversion unit and the feedback regulating unit;

[0029] The first IU conversion unit is used to collect the optical power value of the laser assembly and convert the optical power value into a first voltage value;

[0030] The first amplifier circuit is used to amplify the first voltage value to obtain a processed optical power value, and feed it back to the feedback adjustment unit.

[0031] Optionally, the laser tube optical power acquisition module includes: a first IU conversion unit and a first bias amplifier circuit; the first IU conversion unit is respectively connected to the laser component, the first bias amplifier circuit and the data processing module; the first bias amplifier circuit is respectively connected to the data processing module and the feedback adjustment unit;

[0032] The first IU conversion unit is used to collect the optical power value of the laser assembly and convert the optical power value into a first voltage value;

[0033] The data processing module is used to determine a first bias setting value according to the first voltage value;

[0034] The first bias amplifier circuit is used to amplify the first voltage value based on the first bias setting value to obtain a processed optical power value, and feed it back to the feedback adjustment unit.

[0035] Optionally, the signal acquisition module includes a photoelectric conversion module, a second IU conversion circuit, a second amplification circuit and a low-pass filtering circuit;

[0036] The photoelectric conversion module is used to receive the scattered light signal of the dust to be detected, and obtain the second current through photoelectric conversion;

[0037] The second IU conversion circuit is used to convert the second current into a second voltage value;

[0038] The second amplifier circuit is used to amplify the second voltage value to obtain an amplified voltage value;

[0039] The low-pass filter circuit is used to perform low-pass filtering on the amplified voltage value to obtain a processed scattered light signal.

[0040] Optionally, the second amplifier circuit is a second bias amplifier circuit;

[0041] The second bias amplifier circuit is used to amplify the second voltage value based on the second bias setting value output by the data processing module to obtain an amplified voltage value.

[0042] In a second aspect, the present application provides a dust concentration detection method, which is applied to the above-mentioned dust concentration detection device, and the dust concentration detection method includes:

[0043] Obtaining scattered light signals of dust to be detected;

[0044] Converting the scattered light signal into a second voltage value;

[0045] amplifying the second voltage value based on a second bias setting value to obtain an amplified voltage value;

[0046] Performing low-pass filtering on the amplified voltage value to obtain a processed scattered light signal;

[0047] Get the optical power value of the laser component;

[0048] Processing the optical power value to obtain a processed optical power value;

[0049] The dust concentration value is determined according to the processed scattered light signal and the processed optical power value, or the dust concentration value is determined according to the processed scattered light signal.

[0050] According to the specific embodiments provided in this application, this application discloses the following technical effects:

[0051] The present application provides a dust concentration detection device and method, including: a laser component, a laser driving module, a laser tube optical power acquisition module, a signal acquisition module and a data processing module; the laser driving module outputs a first current according to a set driving value output by the data processing module; the laser component emits a laser with the first current to irradiate the dust to be detected; the laser tube optical power acquisition module acquires the optical power value of the laser component, and processes the optical power value to obtain a processed optical power value; the signal acquisition module acquires the scattered light signal of the dust to be detected, and processes the scattered light signal to obtain a processed scattered light signal; the data processing module determines the dust concentration value according to the processed scattered light signal and the processed optical power value, or determines the dust concentration value according to the processed scattered light signal. The present application improves the accuracy of dust concentration detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0053] Figure 1 A schematic diagram of the structure of a dust concentration detection device provided in one embodiment of the present application;

[0054] Figure 2 A schematic diagram of a dust concentration detection device provided in Example 1;

[0055] Figure 3 A schematic diagram of another dust concentration detection device provided in Example 1;

[0056] Figure 4 A schematic diagram of a dust concentration detection device provided in Example 2;

[0057] Figure 5 A schematic diagram of another dust concentration detection device provided in Example 2;

[0058] Figure 6 A schematic diagram of the structure of a computer device provided in one embodiment of the present application. DETAILED DESCRIPTION

[0059] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0060] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0061] To solve the above problem, a common idea is to add a sensor or signal that can measure wind speed, and use the measured wind speed value (or a signal related to the wind speed value) to compensate the dust concentration value.

[0062] However, the two embodiments of the present application do not follow the above idea, but seek a signal value that is independent of the wind speed and can represent the concentration of particulate matter, directly avoiding the influence of wind speed and the wind speed compensation algorithm.

[0063] like Figure 1 As shown, a dust concentration detection device is provided, including: a laser component, a laser driving module, a laser tube optical power acquisition module, a signal acquisition module and a data processing module.

[0064] The laser assembly is connected to the laser driving module and the laser tube optical power collection module respectively; the laser driving module and the laser tube optical power collection module are both connected to the data processing module; the signal collection module is connected to the data processing module.

[0065] The laser driving module is used to output a first current to the laser component according to the set driving value output by the data processing module.

[0066] The laser component is used to emit laser light with a first current to irradiate the dust to be detected.

[0067] The laser tube optical power acquisition module is used to acquire the optical power value of the laser component and process the optical power value to obtain the processed optical power value.

[0068] The signal acquisition module is used to acquire the scattered light signal of the dust to be detected, and process the scattered light signal to obtain a processed scattered light signal.

[0069] The data processing module is used to determine the dust concentration value according to the processed scattered light signal and the processed optical power value, or to determine the dust concentration value according to the processed scattered light signal.

[0070] In a first specific embodiment, Figure 2 As shown, the laser driving module includes: a UI conversion unit and a constant current driving unit; the UI conversion unit is connected to the data processing module; the constant current driving unit is respectively connected to the UI conversion unit and the laser assembly.

[0071] The UI conversion unit is used to convert the set driving value into the first current. In a first specific implementation, the first current is a constant current.

[0072] The constant current driving unit is used to drive the laser component to emit laser according to the constant current.

[0073] In practical applications, the data processing module uses a microprocessor MCU. The combination of the microprocessor MCU, the UI conversion unit, and the laser constant current drive circuit (constant current drive unit) is used to make the laser component drive at the set drive value (U s0 ) for laser emission output (constant current drive).

[0074] like Figure 2 As shown, the laser tube optical power acquisition module includes: a first IU conversion unit and a first amplifying circuit; the first IU conversion unit is connected to the laser component; the first amplifying circuit is respectively connected to the first IU conversion unit and the data processing module.

[0075] The first IU conversion unit is used to collect the optical power value of the laser component and convert the optical power value into a first voltage value.

[0076] The first amplifier circuit is used to amplify the first voltage value to obtain a processed optical power value, and feed it back to the data processing module.

[0077] In a first specific embodiment, Figure 3 As shown, the first amplifier circuit may be a first bias amplifier circuit. When the first amplifier circuit is a first bias amplifier circuit, the first IU conversion unit is connected to the laser assembly, the first bias amplifier circuit and the data processing module respectively; the first bias amplifier circuit is connected to the data processing module.

[0078] The first IU conversion unit is used to collect the optical power value of the laser component and convert the optical power value into a first voltage value.

[0079] The data processing module is used to determine a first bias setting value according to the first voltage value.

[0080] The first bias amplifier circuit is used to amplify the first voltage value based on the first bias setting value to obtain a processed optical power value, and feed it back to the data processing module.

[0081] In practical applications, the PD, IU conversion 1 (first IU conversion unit), bias amplifier circuit 1 (first bias amplifier circuit) and microprocessor MCU inside the laser component are used to collect and process the optical power value of the laser component. The role of setting a certain bias in the bias amplifier circuit 1 is to prevent U L2 The saturation of the signal and the offset setting value are determined by the MCU by reading U L1 The level value is calculated.

[0082] In a second specific embodiment, Figure 4 As shown, the laser driving module includes: a feedback adjustment unit and a current driving unit; the feedback adjustment unit is respectively connected to the laser tube optical power acquisition module and the data processing module; the current driving unit is respectively connected to the feedback adjustment unit and the laser component.

[0083] The feedback adjustment unit is used to output a first current according to the set driving value and the processed optical power value. In a second specific implementation, the first current is not constant.

[0084] The current driving unit is used to drive the laser component to emit laser light with constant optical power according to the first current.

[0085] like Figure 4 As shown, the laser tube optical power acquisition module includes: a first IU conversion unit and a first amplifying circuit; the first IU conversion unit is connected to the laser component; the first amplifying circuit is respectively connected to the first IU conversion unit and the feedback regulating unit.

[0086] The first IU conversion unit is used to collect the optical power value of the laser component and convert the optical power value into a first voltage value.

[0087] The first amplifier circuit is used to amplify the first voltage value to obtain a processed optical power value, and feed it back to the feedback adjustment unit.

[0088] In a second specific embodiment, Figure 5 As shown, the first amplifier circuit may be a first bias amplifier circuit. When the first amplifier circuit is a first bias amplifier circuit, the first IU conversion unit is connected to the laser assembly, the first bias amplifier circuit and the data processing module respectively; the first bias amplifier circuit is connected to the data processing module and the feedback adjustment unit respectively.

[0089] The first IU conversion unit is used to collect the optical power value of the laser component and convert the optical power value into a first voltage value.

[0090] The data processing module is used to determine a first bias setting value according to the first voltage value.

[0091] The first bias amplifier circuit is used to amplify the first voltage value based on the first bias setting value to obtain a processed optical power value, and feed it back to the feedback adjustment unit.

[0092] The combination of IU conversion 1, bias amplifier circuit 1, MCU, feedback adjustment circuit (feedback adjustment unit), and laser constant power drive circuit (current drive unit) is used to make the laser tube set the optical power (U s0 ) to transmit output.

[0093] The above principle is: when the laser component is powered on, the laser tube (LD) emits laser, which will cause a certain amount of heat inside the laser component. At this time, the temperature rises. At this time, the laser tube will show a certain optical power attenuation phenomenon due to the temperature rise. At this time, the optical power detection device PD inside the laser component will detect the optical power value, convert it into voltage through the circuit, amplify it, and then feed it back to the feedback adjustment circuit. After comparing it with the optical power setting value, it is output to the laser constant power drive circuit. At this time, the current value driving the LD will increase to a certain extent to ensure that the laser tube can output at a constant optical power.

[0094] When the ambient temperature rises or falls, the working principle is similar to the above and will not be repeated.

[0095] In the two specific implementations, the signal acquisition module has the same composition, and includes a photoelectric conversion module, a second IU conversion circuit, a second amplification circuit and a low-pass filter circuit. The photoelectric conversion module is a photosensitive tube.

[0096] The photoelectric conversion module is used to receive the scattered light signal of the dust to be detected, and obtain the second current through photoelectric conversion.

[0097] The second IU conversion circuit is used to convert the second current into a second voltage value.

[0098] The second amplifier circuit is used to amplify the second voltage value to obtain an amplified voltage value.

[0099] In practical applications, the second amplifier circuit is a second bias amplifier circuit, and the second bias amplifier circuit is used to amplify the second voltage value based on the second bias setting value output by the data processing module to obtain the amplified voltage value.

[0100] The low-pass filter circuit is used to perform low-pass filtering on the amplified voltage value to obtain a processed scattered light signal.

[0101] In practical applications, the photosensitive tube, IU conversion 2 (second IU conversion unit), bias amplifier circuit 2 (second bias amplifier circuit), low-pass filter circuit, and microprocessor MCU form a concentration signal data acquisition and processing circuit.

[0102] In a first specific implementation, the data processing module determines the dust concentration value according to the processed scattered light signal and the processed optical power value.

[0103] When the ambient dust concentration is higher, the scattered light signal of the laser dust is stronger. P1 And the amplified signal U P2 By detecting the signal U P2 , combined with the laser tube optical power value U L2 The dust concentration value is calculated.

[0104] In a second specific implementation, the data processing module determines the dust concentration value only based on the processed scattered light signal.

[0105] When the ambient dust concentration is higher, the scattered light signal of the laser dust is stronger. P1 And the amplified signal U P2 By detecting the signal U P2 The dust concentration value can be calculated.

[0106] Different from the second specific embodiment, the first specific embodiment sets the laser tube optical power value U L2 Feedback to the laser emission control end is mainly due to the fact that the second specific implementation method has certain defects. The defect is that temperature is the fundamental cause of the laser optical power adjustment. However, the temperature effect has a certain delay effect, which leads to a certain deviation in the adjustment of the optical power output and a repeated adjustment process, which affects the measurement accuracy to a certain extent.

[0107] The first specific implementation method cancels the feedback link and directly drives the laser tube in a constant current mode. When the temperature changes, the optical power of the laser tube will change accordingly. At this time, the MCU reads the changed value U L2 , and use it as reference data to perform certain compensation calculations on the dust concentration value, thereby improving the accuracy of dust concentration detection.

[0108] In an exemplary embodiment, the present application provides a dust concentration detection method, which is applied to the above-mentioned dust concentration detection device, and the dust concentration detection method includes:

[0109] Obtain the scattered light signal of the dust to be detected.

[0110] The scattered light signal is converted into a second voltage value.

[0111] The second voltage value is amplified based on the second bias setting value to obtain an amplified voltage value.

[0112] The amplified voltage value is low-pass filtered to obtain a processed scattered light signal.

[0113] Get the optical power value of the laser component.

[0114] The optical power value is processed to obtain a processed optical power value.

[0115] The dust concentration value is determined according to the processed scattered light signal and the processed optical power value, or the dust concentration value is determined according to the processed scattered light signal.

[0116] As an optional implementation manner, processing the optical power value to obtain a processed optical power value specifically includes:

[0117] The optical power value is converted into a first voltage value.

[0118] The first voltage value is amplified based on the first bias setting value to obtain a processed optical power value.

[0119] In an exemplary embodiment, a computer device is provided. The computer device may be a server or a terminal. The internal structure diagram thereof may be as follows: Figure 6 As shown. The computer device includes a processor, a memory, an input / output interface (Input / Output, referred to as I / O) and a communication interface. The processor, the memory and the input / output interface are connected through a system bus, and the communication interface is connected to the system bus through the input / output interface. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The input / output interface of the computer device is used to exchange information between the processor and an external device. The communication interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, a dust concentration detection method is implemented.

[0120] Those skilled in the art will understand that Figure 6The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components. In an exemplary embodiment, a computer device is provided, including a memory and a processor, wherein a computer program is stored in the memory, and the processor implements the above-mentioned dust concentration detection device when executing the computer program.

[0121] In an exemplary embodiment, a computer-readable storage medium is provided, storing a computer program, which implements the above-mentioned dust concentration detection method when executed by a processor.

[0122] In an exemplary embodiment, a computer program product is provided, including a computer program, which implements the above-mentioned dust concentration detection method when executed by a processor.

[0123] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant regulations.

[0124] Those of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM may be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM).

[0125] The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. The non-relational database may include a distributed database based on blockchain, etc., but is not limited thereto. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but is not limited thereto.

[0126] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0127] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and core ideas of this application. At the same time, for those skilled in the art, according to the ideas of this application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting this application.

Claims

1. A dust concentration detection device, characterized in that: Including: laser assembly, laser driving module, laser tube optical power acquisition module, signal acquisition module and data processing module; The laser assembly is connected to the laser driving module and the laser tube optical power collection module respectively; the laser driving module, the laser tube optical power collection module and the signal collection module are all connected to the data processing module; The laser driving module is used to output a first current to the laser component based on the set driving value output by the data processing module; The laser assembly is used to emit a laser beam to irradiate the dust to be detected; The laser tube optical power acquisition module is used to acquire the optical power value of the laser component and process the optical power value to obtain the processed optical power value; The signal acquisition module is used to collect the scattered light signal of the dust to be detected, and process the scattered light signal to obtain a processed scattered light signal; The data processing module is used to determine the dust concentration value according to the processed scattered light signal and the processed optical power value, or to determine the dust concentration value according to the processed scattered light signal.

2. The dust concentration detection device according to claim 1, characterized in that: The laser driving module comprises: a UI conversion unit and a constant current driving unit; the UI conversion unit is connected to the data processing module; the constant current driving unit is respectively connected to the UI conversion unit and the laser assembly; The UI conversion unit is used to convert the set driving value into the first current, and the first current is a constant current; The constant current driving unit is used to drive the laser component to emit laser according to the constant current.

3. The dust concentration detection device according to claim 2, characterized in that: The laser tube optical power acquisition module includes: a first IU conversion unit and a first amplifying circuit; the first IU conversion unit is connected to the laser assembly; the first amplifying circuit is respectively connected to the first IU conversion unit and the data processing module; The first IU conversion unit is used to collect the optical power value of the laser assembly and convert the optical power value into a first voltage value; The first amplifier circuit is used to amplify the first voltage value to obtain a processed optical power value, and feed it back to the data processing module.

4. The dust concentration detection device according to claim 2, characterized in that: The laser tube optical power acquisition module includes: a first IU conversion unit and a first bias amplifier circuit; the first IU conversion unit is connected to the laser component, the first bias amplifier circuit and the data processing module respectively; the first bias amplifier circuit is connected to the data processing module; The first IU conversion unit is used to collect the optical power value of the laser assembly and convert the optical power value into a first voltage value; The data processing module is used to determine a first bias setting value according to the first voltage value; The first bias amplifier circuit is used to amplify the first voltage value based on the first bias setting value to obtain a processed optical power value, and feed it back to the data processing module.

5. The dust concentration detection device according to claim 1, characterized in that: The laser driving module comprises: a feedback regulating unit and a current driving unit; the feedback regulating unit is respectively connected to the laser tube optical power acquisition module and the data processing module; the current driving unit is respectively connected to the feedback regulating unit and the laser assembly; The feedback adjustment unit is used to output the first current according to the set driving value and the processed optical power value; The current driving unit is used to drive the laser component to emit laser light with constant optical power according to the first current.

6. The dust concentration detection device according to claim 5, characterized in that: The laser tube optical power acquisition module includes: a first IU conversion unit and a first amplifying circuit; the first IU conversion unit is connected to the laser assembly; the first amplifying circuit is respectively connected to the first IU conversion unit and the feedback regulating unit; The first IU conversion unit is used to collect the optical power value of the laser assembly and convert the optical power value into a first voltage value; The first amplifier circuit is used to amplify the first voltage value to obtain a processed optical power value, and feed it back to the feedback adjustment unit.

7. The dust concentration detection device according to claim 5, characterized in that: The laser tube optical power acquisition module includes: a first IU conversion unit and a first bias amplifier circuit; the first IU conversion unit is respectively connected to the laser component, the first bias amplifier circuit and the data processing module; the first bias amplifier circuit is respectively connected to the data processing module and the feedback adjustment unit; The first IU conversion unit is used to collect the optical power value of the laser assembly and convert the optical power value into a first voltage value; The data processing module is used to determine a first bias setting value according to the first voltage value; The first bias amplifier circuit is used to amplify the first voltage value based on the first bias setting value to obtain a processed optical power value, and feed it back to the feedback adjustment unit.

8. The dust concentration detection device according to any one of claims 1, 2 or 5, characterized in that: The signal acquisition module includes a photoelectric conversion module, a second IU conversion circuit, a second amplification circuit and a low-pass filter circuit; The photoelectric conversion module is used to receive the scattered light signal of the dust to be detected, and obtain the second current through photoelectric conversion; The second IU conversion circuit is used to convert the second current into a second voltage value; The second amplifier circuit is used to amplify the second voltage value to obtain an amplified voltage value; The low-pass filter circuit is used to perform low-pass filtering on the amplified voltage value to obtain a processed scattered light signal.

9. The dust concentration detection device according to claim 8, characterized in that: The second amplifier circuit is a second bias amplifier circuit; The second bias amplifier circuit is used to amplify the second voltage value based on the second bias setting value output by the data processing module to obtain an amplified voltage value.

10. A dust concentration detection method, characterized in that: The dust concentration detection method is applied to the dust concentration detection device according to any one of claims 1 to 9, and the dust concentration detection method comprises: Obtaining scattered light signals of dust to be detected; Converting the scattered light signal into a second voltage value; amplifying the second voltage value based on a second bias setting value to obtain an amplified voltage value; Performing low-pass filtering on the amplified voltage value to obtain a processed scattered light signal; Get the optical power value of the laser component; Processing the optical power value to obtain a processed optical power value; The dust concentration value is determined according to the processed scattered light signal and the processed optical power value, or the dust concentration value is determined according to the processed scattered light signal.

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