A method, system, apparatus, and medium for calibrating the output signal of a particle counter.

Abstract

This application relates to the field of particle counters, and discloses a method, system, apparatus, and medium for calibrating the output signal of a particle counter. The method includes: acquiring the optical noise signal output by the particle counter to be calibrated, determining whether the optical noise signal meets preset conditions, and if not, transmitting the calibration signal to an optical power control circuit so that the optical power control circuit adjusts the input voltage of the laser in the particle counter to be calibrated, thereby calibrating the output signal of the particle counter. Therefore, the technical solution provided in this application, by acquiring the output signal of the particle counter and adjusting the input voltage of the laser based on the output signal to calibrate the particle counter's output signal, avoids the influence of factors such as temperature and the stability of the signal amplification circuit in the particle counter on the particle counter's output signal during the particle counter's processing of particle scattered light, such as reception, conversion, and amplification, thereby improving the particle monitoring accuracy of the particle counter.

Description

Technical Field

[0001] This application relates to the field of particle counters, and in particular to a method, system, apparatus and medium for calibrating the output signal of a particle counter. Background Art

[0002] Particle counters generate particle signals by receiving, converting, and amplifying the scattered light from particles. They are mainly used to test the cleanliness of gases containing particles and have wide applications in pharmaceuticals, food, semiconductors, and electronics.

[0003] When a particle counter monitors particles, the higher the intensity of the laser beam used to excite the scattered light from the particles, the stronger the particle signal obtained for the same particle, and vice versa. Simultaneously, the stability of the signal amplification circuit, which processes the scattered light signal for receiving, converting, and amplifying, also affects the particle signal output for the same particle. Furthermore, many unavoidable factors influence the particle signal output during the formation of scattered light and its processing to form a particle signal. For example, temperature significantly affects the accuracy of the particle counter; temperature-dependent light sources in the counter can lead to unstable optical power output. In signal acquisition circuits, commonly used signal sensors, such as photodetectors like photodiodes, are also affected by temperature due to their current-voltage characteristic curve. Additionally, temperature-dependent signal amplification circuits are prone to output curve shifts.

[0004] Currently, to improve the particle detection accuracy of particle counters, the main approach is to adjust the output signal of the laser within the particle counter, i.e., to maintain the stability of the laser's output signal during operation. However, the signal output from the laser still needs to undergo signal conversion and amplification processing by a signal amplification circuit. During this processing, the signal is inevitably affected by factors such as temperature and the stability of the signal amplification circuit, thus impacting the particle detection accuracy of the particle counter.

[0005] Therefore, improving the particle monitoring accuracy of particle counters is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] The purpose of this application is to provide a method, system, apparatus, and medium for calibrating the output signal of a particle counter. By acquiring the output signal of the particle counter and determining whether the output signal meets preset conditions, if the preset conditions are not met, the calibration signal is transmitted to the optical power control circuit so that the optical power control circuit adjusts the input voltage of the laser in the particle counter to calibrate the output signal of the particle counter.

[0007] To address the aforementioned technical problems, this application provides a method for calibrating the output signal of a particle counter, comprising:

[0008] Acquire the optical noise signal output by the particle counter to be calibrated;

[0009] If the optical noise signal does not meet the preset conditions, the calibration signal is transmitted to the optical power control circuit so that the optical power control circuit can adjust the operating voltage of the laser in the particle counter to be calibrated in order to calibrate the output signal of the particle counter.

[0010] Preferably, the preset condition is that the difference between the optical noise signal and the preset value is within a preset range.

[0011] Preferably, after determining that the optical noise signal does not meet the preset condition, the method further includes:

[0012] Determine whether the optical noise signal is greater than a preset warning value;

[0013] If the value exceeds the preset warning value, an alarm signal will be issued.

[0014] If the value is not greater than the preset warning value, then proceed to the step of transmitting the calibration signal to the optical power control circuit; wherein the preset warning value is much greater than the preset value.

[0015] To address the aforementioned technical problems, this application also provides a system for calibrating the output signal of a particle counter, which is applied to the aforementioned method for calibrating the output signal of a particle counter, and includes: a signal acquisition circuit and a signal processing module;

[0016] The input terminal of the signal acquisition circuit is connected to the output terminal of the particle counter to be calibrated, and the output terminal of the signal acquisition circuit is connected to the input terminal of the signal processing module, for transmitting the acquired optical noise signal to the signal processing module;

[0017] The output of the signal processing module is connected to the input of the optical power control circuit. It is used to determine whether the optical noise signal meets the preset conditions. If the preset conditions are not met, the calibration signal is transmitted to the optical power control circuit so that the optical power control circuit can adjust the operating voltage of the laser in the particle counter to be calibrated in order to calibrate the output signal of the particle counter to be calibrated.

[0018] Preferably, the signal acquisition circuit includes a voltage divider circuit and an ADC acquisition circuit;

[0019] The input terminal of the voltage divider circuit serves as the input terminal of the signal acquisition circuit, the output terminal of the voltage divider circuit is connected to the input terminal of the ADC acquisition circuit, and the output terminal of the ADC acquisition circuit serves as the output terminal of the signal acquisition circuit.

[0020] Preferably, the voltage divider circuit includes a first resistor, a second resistor, a capacitor, and an inverting amplifier circuit;

[0021] The first common terminal of the second resistor and the capacitor connected in parallel is grounded. The common terminal of the second common terminal and one end of the first resistor is connected to the input terminal of the inverting amplifier circuit. The other end of the first resistor serves as the input terminal of the voltage divider circuit, and the output terminal of the inverting amplifier circuit serves as the output terminal of the voltage divider circuit.

[0022] To address the aforementioned technical problems, this application also provides an apparatus for calibrating the output signal of a particle counter, comprising:

[0023] The acquisition module is used to acquire the optical noise signal output by the particle counter to be calibrated;

[0024] The judgment module is used to determine whether the optical noise signal meets the preset conditions. If the preset conditions are not met, the transmission module is invoked.

[0025] The transmission module is used to transmit the calibration signal to the optical power control circuit, so that the optical power control circuit can adjust the operating voltage of the laser in the particle counter to be calibrated in order to calibrate the output signal of the particle counter.

[0026] To address the aforementioned technical problems, this application also provides an apparatus for calibrating the output signal of a particle counter, including a memory for storing a computer program;

[0027] A processor, used to execute the computer program to implement the steps of the method for calibrating the particle counter output signal as described above.

[0028] To address the aforementioned technical problems, this application also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of the method for calibrating the particle counter output signal as described above.

[0029] The present invention provides a method for calibrating the output signal of a particle counter, comprising: acquiring the optical noise signal output by the particle counter to be calibrated, and determining whether the optical noise signal meets preset conditions. If the preset conditions are not met, the calibration signal is transmitted to an optical power control circuit so that the optical power control circuit adjusts the operating voltage of the laser in the particle counter to be calibrated, thereby calibrating the output signal of the particle counter. Therefore, the technical solution provided in this application, by acquiring the output signal of the particle counter and adjusting the operating voltage of the laser based on the output signal to calibrate the output signal of the particle counter, avoids the influence of factors such as temperature and the stability of the signal amplification circuit in the particle counter on the output signal of the particle counter during the receiving, conversion, and amplification of particle scattered light, thereby improving the particle monitoring accuracy of the particle counter.

[0030] In addition, this application also provides a system, apparatus and medium for calibrating the output signal of a particle counter, which corresponds to the method for calibrating the output signal of a particle counter and has the same effect. Attached Figure Description

[0031] To more clearly illustrate the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 A flowchart illustrating a method for calibrating the output signal of a particle counter, provided in an embodiment of this application;

[0033] Figure 2 This is a structural diagram of a system for calibrating the output signal of a particle counter, provided in an embodiment of this application.

[0034] Figure 3 This is a structural diagram of a system for calibrating the output signal of a particle counter according to another embodiment of this application;

[0035] Figure 4 This is a structural diagram of a device for calibrating the output signal of a particle counter, provided in an embodiment of this application.

[0036] Figure 5 A structural diagram of a device for calibrating the output signal of a particle counter according to another embodiment of this application;

[0037] The attached diagram is labeled as follows: 1 is the signal acquisition circuit, 2 is the signal processing module, 3 is the optical power control circuit, 4 is the particle counter to be calibrated, 5 is the inverting amplifier circuit, and 6 is the ADC acquisition circuit. Detailed Implementation

[0038] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this application.

[0039] The core of this application is to provide a method, system, device, and medium for calibrating the output signal of a particle counter. By acquiring the optical noise signal of the particle counter and determining whether the optical noise signal meets preset conditions, the operating voltage of the laser in the particle counter is adjusted to stabilize the output optical noise signal, thereby calibrating the particle counter. This achieves the purpose of calibrating the output signal of the particle counter during particle monitoring, where the particle scattering occurs in the laser beam, and the scattered signal is received, converted, and amplified. This avoids the influence of factors such as temperature, the stability of the particle counter body and the signal amplification circuit in the particle counter on the particle signal conversion and output signal during the particle counter's operation, thereby improving the particle monitoring accuracy of the particle counter.

[0040] To enable those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0041] Particle counters generate particle signals by receiving, converting, amplifying, and reducing noise in the scattered light from particles. They are mainly used to test the cleanliness of gases containing particles and have wide applications in pharmaceuticals, food, semiconductors, and electronics.

[0042] Particle counters detect particles by monitoring the scattered light they receive from a beam of light. During particle monitoring, a higher intensity laser beam used to excite the scattered light results in a stronger particle signal for the same particle, and vice versa. Simultaneously, the stability of the signal amplification circuitry used by the particle counter to receive, convert, and amplify the scattered light signal also affects the output particle signal for the same particle. Furthermore, many unavoidable factors influence the particle signal output during the formation of scattered light and its processing. For example, temperature significantly affects the accuracy of the particle counter; temperature-dependent light sources in the counter can lead to unstable optical power output. Commonly used signal acquisition sensors, such as photodetectors like photodiodes, are also affected by temperature due to their current-voltage characteristic curves. Additionally, temperature-dependent signal amplification circuitry can easily cause deviations in the output curve.

[0043] Currently, to improve the particle detection accuracy of particle counters, the main approach is to adjust the stability of the laser output signal within the particle counter, i.e., to maintain a stable output signal during laser operation. However, after the scattered light from the laser is received and converted by the photodetector in the particle counter, it still needs to undergo signal conversion, amplification, and noise reduction processing by a signal amplification circuit. During this processing, the signal is inevitably affected by factors such as temperature and the stability of the signal amplification circuit, thus impacting the particle detection accuracy of the particle counter.

[0044] To avoid the influence of factors such as temperature, the stability of the particle counter itself, and the signal amplification circuit within the particle counter on the output signal of the particle counter during the receiving, conversion, and amplification of particle scattered light, and to improve the particle monitoring accuracy of the particle counter, this application provides a method for calibrating the output signal of a particle counter. By acquiring the optical noise signal of the particle counter to be calibrated, determining whether the optical noise signal meets preset conditions, and then determining whether the operating voltage of the laser in the particle counter needs to be adjusted, the difference between the optical noise signal and the preset value is calibrated to a preset range. This calibrates the light signal generation, receiving, conversion, and amplification capabilities of the particle counter, ensuring that when particles scatter light from the particle counter, the output signal corresponding to particles of the same size is not affected by factors such as the laser, temperature, the stability of the particle counter itself, and the signal amplification circuit, thus outputting a highly consistent particle signal. In other words, the particle counter's output signal is calibrated. Therefore, by acquiring, judging, and calibrating the already converted and amplified optical noise signal, the stability of the particle counter's output signal is avoided from being affected by additional factors during the conversion and amplification of the acquired signal by the particle counter.

[0045] Figure 1 A flowchart illustrating a method for calibrating the output signal of a particle counter provided in this application embodiment is shown below. Figure 1 As shown, the method includes:

[0046] S10: Acquire the optical noise signal output by the particle counter to be calibrated.

[0047] S11: Determine whether the optical noise signal meets the preset conditions. If it does not meet the preset conditions, proceed to step S12.

[0048] S12: Transmit the calibration signal to the optical power control circuit so that the optical power control circuit can adjust the operating voltage of the laser in the particle counter to be calibrated in order to calibrate the output signal of the particle counter.

[0049] In a specific embodiment, the particle counter body typically includes: a housing, a laser disposed within the housing, a signal acquisition sensor, a gas path assembly providing particle flow, and an optical trap for trapping the laser beam. Furthermore, the particle counter also includes a signal amplification circuit connected to the output of the signal acquisition sensor, and a counting circuit that compares and counts the output signal of the signal amplification circuit. The signal amplification circuit is typically used to amplify the received signal in multiple stages, including a first-stage amplification circuit for signal conversion and amplification, and a noise reduction amplification circuit for noise reduction and amplification of the output signal of the first-stage amplification circuit. It should be noted that when the laser in the particle counter is operating, regardless of whether particles scatter in the laser beam, the optical signal received by the signal acquisition sensor includes optical noise caused by stray light and other factors. When a particle enters the particle counter and is scattered in the laser beam, the signal acquisition sensor collects the optical noise signal and the particle scattered light signal, and converts the collected optical noise signal and particle scattered light signal into a current signal, which is transmitted to the signal amplification circuit. The signal amplification circuit converts the current signal into a voltage signal, and amplifies and reduces the noise of the voltage signal to obtain the output signal corresponding to the particle of the particle counter. It can be seen that if only the signal output by the laser is calibrated, it is difficult to avoid the influence of the signal on the signal when it is converted and amplified by the signal amplification circuit.

[0050] Therefore, in the technical solution provided by this application, the optical noise signal output by the particle counter to be calibrated is obtained in step S10, and it is determined in step S11 whether the optical noise signal meets the preset conditions. If the preset conditions are not met, the process proceeds to step S12, that is, the calibration signal is transmitted to the optical power control circuit, and the optical power control circuit adjusts the working voltage of the laser in the particle counter to be calibrated, thereby realizing the calibration of the output signal of the particle counter to be calibrated.

[0051] It is understandable that the calibration in this application is based on collecting optical noise signals and judging these signals to determine whether the laser's operating voltage needs to be adjusted, so that the optical noise signal meets preset conditions. This avoids signal deviations caused by conversion and amplification in the particle counter itself or signal amplification circuit after only calibrating the laser's output voltage. Instead, it calibrates the entire process of light signal generation, reception, conversion, and amplification in the particle counter. In other words, this application does not maintain the stability of the laser's output signal, but rather maintains the stability of the particle counter's output optical noise signal before noise reduction in the signal amplification circuit, thereby maintaining the stability of the particle counter's output signal corresponding to the scattered light signals of particles of various sizes. That is, it calibrates the particle counter's output signal.

[0052] It is worth noting that when determining whether the acquired optical noise signal meets the preset conditions, the preset conditions can be that the difference between the optical noise signal and the preset value is within a preset range, or that the optical noise signal is less than the preset value. This application does not limit the preset conditions.

[0053] In practice, to avoid errors in calibration results due to component failure during calibration, a warning value can be set. When the optical noise signal exceeds this warning value, it can be determined that the particle counter's output signal is erroneous. This warning value is understood to be significantly higher than the preset value set in the predefined conditions. Alternatively, the warning value can be set significantly lower than the preset value. In this case, when the optical noise signal falls below the warning value, it is determined that the particle counter's output signal is erroneous, and an alarm signal is issued to alert the user.

[0054] The method for calibrating the output signal of a particle counter provided in this application includes: acquiring the optical noise signal output by the particle counter to be calibrated, and determining whether the optical noise signal meets a preset condition. If the preset condition is not met, the calibration signal is transmitted to an optical power control circuit so that the optical power control circuit adjusts the operating voltage of the laser in the particle counter to be calibrated until the optical noise signal meets the preset condition, thereby calibrating the output signal of the particle counter. Therefore, the technical solution provided in this application, by acquiring the optical noise signal of the particle counter and adjusting the operating voltage of the laser based on the optical noise signal to calibrate the output signal of the particle counter, that is, adjusting the laser operating voltage based on the optical noise signal output by the particle counter to calibrate the output signal of the particle counter, avoids the influence of factors such as temperature and the stability of the signal amplification circuit in the particle counter on the output signal of the particle counter during the receiving, conversion, and amplification of particle scattered light by the particle counter, thereby improving the particle monitoring accuracy of the particle counter.

[0055] In a specific embodiment, by determining whether the optical noise signal of the particle counter meets a preset condition, it is determined whether the operating voltage of the laser in the particle counter needs to be adjusted, thereby achieving the purpose of calibrating the output signal of the particle counter. The preset condition is that the difference between the optical noise signal and a preset value is within a preset range. That is, when the difference between the optical noise signal and the preset value is within the preset range, the optical noise signal of the particle counter is determined to be normal, and thus the output signal of the particle counter is determined to be normal. When the difference is not within the preset range, the optical noise signal of the particle counter is determined to be abnormal, and thus the output signal of the particle counter has a large deviation and needs calibration. At this time, the calibration signal is transmitted to the optical power control circuit to adjust the operating voltage of the laser until the optical noise signal meets the preset condition, thereby calibrating the output signal of the particle counter. It should be noted that this application does not limit the preset value and preset range, and they can be set according to the specific application scenario of the particle counter.

[0056] Of course, this application does not limit the preset conditions. When judging the acquired optical noise signal, it can also judge whether the optical noise signal is greater than a preset value. If it is greater than the preset value, the optical power control circuit controls the reduction of the laser's operating voltage to reduce the laser's output signal. If it is less than the preset value, the optical power control circuit controls the increase of the laser's operating voltage. Of course, after adjusting the laser's operating voltage, it is necessary to ensure that the difference between the particle counter's output signal and the preset value is within a preset range.

[0057] The method for calibrating the output signal of a particle counter provided in this application improves the reliability of the particle counter by setting different preset conditions to meet the particle monitoring accuracy of the particle counter in different application scenarios.

[0058] Based on the above embodiments, to avoid ineffective calibration of the particle counter due to particle counter damage and erroneous output signals, thus wasting resources, in addition to determining that the optical noise signal does not meet preset conditions, it is also determined whether the optical noise signal exceeds a preset warning value. If it exceeds the preset warning value, the particle counter is determined to be damaged, i.e., the output signal is erroneous, and an alarm signal is issued to remind the user. If it does not exceed the preset warning value, the particle counter is determined to be intact and the output signal needs calibration. In this case, the calibration signal is transmitted to the optical power control circuit to calibrate the output signal of the particle counter.

[0059] It should be noted that the comparison between the optical noise signal and the preset conditions and warning values ​​can be performed simultaneously or sequentially. This application does not limit the order of comparison. For example, after determining that the optical noise signal does not meet the preset conditions, it can first be determined whether the optical noise signal is greater than the preset warning value. If it is greater than the preset warning value, it is determined that the particle counter is damaged, i.e., the output signal is incorrect, and an alarm signal is issued to remind the user. If it is not greater than the preset warning value, it is determined that the particle counter is not damaged and the output signal needs to be calibrated.

[0060] The method for calibrating the output signal of a particle counter provided in this application determines whether the optical noise signal exceeds a preset warning value in addition to determining that the optical noise signal does not meet the preset conditions. If it exceeds the preset warning value, the output signal of the particle counter is determined to be erroneous. In order to avoid wasting resources due to invalid calibration, the output signal is not calibrated at this time, and an alarm signal is sent to remind the user, thereby improving the reliability of the particle counter.

[0061] In the above embodiments, a method for calibrating the output signal of a particle counter has been described in detail. This application also provides an embodiment of a system for calibrating the output signal of a particle counter. Figure 2 This is a structural diagram of a system for calibrating the output signal of a particle counter provided in an embodiment of this application, as shown below. Figure 2 As shown, the system includes a signal acquisition circuit 1 and a signal processing module 2. The input terminal of the signal acquisition circuit 1 is connected to the output terminal of the particle counter 4 to be calibrated, and the output terminal of the signal acquisition circuit 1 is connected to the input terminal of the signal processing module 2, used to transmit the acquired optical noise signal to the signal processing module 2. The output terminal of the signal processing module 2 is connected to the input terminal of the optical power control circuit 3. The signal processing module 2 is used to determine whether the optical noise signal meets preset conditions. If it does not meet the preset conditions, it transmits a calibration signal to the optical power control circuit 3 so that the optical power control circuit 3 can adjust the operating voltage of the laser in the particle counter 4 to calibrate the optical noise signal output by the particle counter 4.

[0062] It is worth noting that the calibration signal emitted by the signal processing module 2 can be determined by the binary search algorithm, or by the combination of the algorithm program and the circuit based on whether the optical noise signal meets the preset conditions. This application does not limit this.

[0063] In fact, the signal acquisition sensor in the particle counter converts the received light into an electric current through photoelectric conversion. When the laser is working and particles are being monitored, the signal acquisition sensor collects the light noise and the scattered light from the particles. If no particles are being monitored, the signal acquisition sensor collects the light noise.

[0064] Furthermore, the signal amplification circuit connected to the output of the signal acquisition sensor converts, amplifies, and reduces noise in the received current to obtain the particle voltage signal. Noise reduction is used to remove optical noise. The signal amplification circuit in the particle counter to be calibrated is a multi-stage signal amplification circuit. When acquiring the optical noise signal from the signal amplification circuit, it needs to be acquired on the circuit before the optical noise is reduced by the noise reduction module in the signal amplification circuit. Since the signal acquisition circuit 1 acquires the optical noise signal, it can actually be connected to any output terminal of the signal amplification circuit in the particle counter 4 that contains the unreduced optical noise signal. This application does not limit the specific connection location as long as it allows for the acquisition of the optical noise signal.

[0065] In specific implementation, signal acquisition circuit 1 is used to acquire the optical noise signal output by the particle counter 4 to be calibrated. Specifically, signal acquisition circuit 1 acquires the voltage signal characterizing the optical noise signal output by the signal amplification circuit before noise reduction when the laser in the particle counter 4 is working and no particles are scattering, and transmits the optical noise signal to signal processing module 2. Signal processing module 2 judges whether the optical noise signal meets the preset conditions, and then determines whether the particle counter 4 to be calibrated needs to be calibrated.

[0066] The system for calibrating the output signal of a particle counter provided in this application includes a signal acquisition circuit and a signal processing module. The input terminal of the signal acquisition circuit is connected to the output terminal of the particle counter to be calibrated, and the output terminal of the signal acquisition circuit is connected to the input terminal of the signal processing module, for transmitting the acquired optical noise signal to the signal processing module. The output terminal of the signal processing module is connected to the input terminal of an optical power control circuit, for determining whether the optical noise signal meets preset conditions. If the preset conditions are not met, a calibration signal is transmitted to the optical power control circuit so that the optical power control circuit adjusts the operating voltage of the laser in the particle counter to calibrate the output signal of the particle counter. By acquiring the optical noise signal of the particle counter and adjusting the operating voltage of the laser according to the optical noise signal to calibrate the optical noise signal of the particle counter, that is, adjusting the laser operating voltage according to the optical noise signal of the particle counter to calibrate the output signal of the particle counter, the influence of factors such as temperature and the stability of the signal amplification circuit in the particle counter on the output signal of the particle counter is avoided when the particle counter receives, converts, and amplifies the scattered light from the particles, thereby improving the particle monitoring accuracy of the particle counter.

[0067] In a specific embodiment, the signal acquisition circuit includes a voltage divider circuit and an ADC acquisition circuit. The input terminal of the voltage divider circuit serves as the input terminal of the signal acquisition circuit, and the output terminal of the voltage divider circuit is connected to the input terminal of the ADC acquisition circuit. The output terminal of the ADC acquisition circuit serves as the output terminal of the signal acquisition circuit. The voltage divider circuit includes at least two resistors for voltage division and a voltage follower formed by an inverting amplifier circuit. The output terminal of the inverting amplifier circuit is connected to the input terminal of the ADC acquisition circuit. Figure 3 A structural diagram of a system for calibrating the output signal of a particle counter provided in another embodiment of this application is shown below. Figure 3 As shown, the voltage divider circuit includes a first resistor R1, a second resistor R2, a capacitor C2, and an inverting amplifier circuit 5. The first common terminal of the second resistor R2 and capacitor C2 connected in parallel is grounded. The common terminal of the second common terminal and one end of the first resistor R1 is connected to the inverting input terminal of the inverting amplifier circuit 5. The other end of the first resistor R1 serves as the input terminal of the voltage divider circuit. The output terminal of the inverting amplifier circuit 5 serves as the output terminal of the voltage divider circuit, i.e., the input terminal of the ADC acquisition circuit 6. Wherein, as... Figure 3 As shown, the inverting amplifier circuit 5 consists of resistors R3, R4, and R5, capacitor C1, and an operational amplifier.

[0068] The system for calibrating the output signal of a particle counter provided in this application acquires the optical noise signal of the particle counter through a signal acquisition circuit and transmits it to a signal processing module. The signal processing module adjusts the operating voltage of the laser according to the optical noise signal to calibrate the optical noise signal of the particle counter, thereby calibrating the output signal of the particle counter. That is, the laser operating voltage is adjusted according to the optical noise signal of the particle counter to calibrate the optical noise signal of the particle counter, thereby calibrating the output signal of the particle counter. This avoids the influence of factors such as temperature and the stability of the signal amplification circuit in the particle counter on the accuracy of the particle counter output signal when the particle counter receives, converts and amplifies the scattered light from the particles, thereby improving the particle monitoring accuracy of the particle counter.

[0069] In the above embodiments, the method for calibrating the particle counter output signal has been described in detail. This application also provides embodiments corresponding to the apparatus for calibrating the particle counter output signal. It should be noted that this application describes the embodiments of the apparatus from two perspectives: one based on functional modules and the other based on hardware structure.

[0070] Figure 4 This is a structural diagram of a device for calibrating the output signal of a particle counter provided in an embodiment of this application, as shown below. Figure 4 As shown, the device includes:

[0071] Acquisition module 10 is used to acquire the optical noise signal output by the particle counter to be calibrated;

[0072] The judgment module 11 is used to determine whether the optical noise signal meets the preset conditions. If the preset conditions are not met, the transmission module 12 is called.

[0073] The transmission module 12 is used to transmit the calibration signal to the optical power control circuit so that the optical power control circuit can adjust the operating voltage of the laser in the particle counter to be calibrated in order to calibrate the output signal of the particle counter.

[0074] Since the embodiments of the apparatus and the embodiments of the method correspond to each other, please refer to the description of the embodiments of the method for the embodiments of the apparatus, which will not be repeated here.

[0075] The apparatus for calibrating the output signal of a particle counter provided in this application includes a signal acquisition circuit and a signal processing module. The input terminal of the signal acquisition circuit is connected to the output terminal of the particle counter to be calibrated, and the output terminal of the signal acquisition circuit is connected to the input terminal of the signal processing module, for transmitting the acquired optical noise signal to the signal processing module. The output terminal of the signal processing module is connected to the input terminal of an optical power control circuit, for determining whether the optical noise signal meets preset conditions. If the preset conditions are not met, a calibration signal is transmitted to the optical power control circuit so that the optical power control circuit adjusts the operating voltage of the laser in the particle counter to calibrate the optical noise signal of the particle counter, thereby calibrating the output signal of the particle counter. By acquiring the optical noise signal of the particle counter and adjusting the operating voltage of the laser according to the optical noise signal to calibrate the output signal of the particle counter, that is, adjusting the laser input voltage according to the optical noise signal of the particle counter to calibrate the output signal of the particle counter, the influence of factors such as temperature and the stability of the signal amplification circuit in the particle counter on the output signal of the particle counter is avoided when the particle counter receives, converts, and amplifies the scattered light from the particles, thereby improving the particle monitoring accuracy of the particle counter.

[0076] Figure 5 A structural diagram of a device for calibrating the output signal of a particle counter according to another embodiment of this application is shown below. Figure 5 As shown, the device for calibrating the particle counter output signal includes: a memory 20 for storing a computer program;

[0077] The processor 21 is configured to execute a computer program to implement the steps of the method for calibrating the particle counter output signal as described in the above embodiments.

[0078] The device for calibrating the output signal of the particle counter provided in this embodiment may include, but is not limited to, a microcontroller built into the particle counter device, a smartphone, a tablet computer, a laptop computer, or a desktop computer.

[0079] The processor 21 may include one or more processing cores, such as a quad-core processor or an octa-core processor. The processor 21 may be implemented using at least one of the following hardware forms: Digital Signal Processor (DSP), Field-Programmable Gate Array (FPGA), or Programmable Logic Array (PLA). The processor 21 may also include a main processor and a coprocessor. The main processor, also known as the Central Processing Unit (CPU), is used to process data in the wake-up state; the coprocessor is a low-power processor used to process data in the standby state. In some embodiments, the processor 21 may integrate a Graphics Processing Unit (GPU), which is responsible for rendering and drawing the content to be displayed on the screen. In some embodiments, the processor 21 may also include an Artificial Intelligence (AI) processor, which is used to handle computational operations related to machine learning.

[0080] The memory 20 may include one or more computer-readable storage media, which may be non-transitory. The memory 20 may also include high-speed random access memory and non-volatile memory, such as one or more disk storage devices or flash memory devices. In this embodiment, the memory 20 is used to store at least the following computer program 201, which, after being loaded and executed by the processor 21, is capable of implementing the relevant steps of the method for calibrating the particle counter output signal disclosed in any of the foregoing embodiments. In addition, the resources stored in the memory 20 may also include an operating system 202 and data 203, and the storage method may be temporary or permanent storage. The operating system 202 may include Windows, Unix, Linux, etc. The data 203 may include, but is not limited to, the data involved in the method for calibrating the particle counter output signal.

[0081] In some embodiments, the apparatus for calibrating the particle counter output signal may further include a display screen 22, an input / output interface 23, a communication interface 24, a power supply 25, and a communication bus 26.

[0082] Those skilled in the art will understand that Figure 5 The structure shown does not constitute a limitation on the device for calibrating the particle counter output signal and may include more or fewer components than shown.

[0083] The apparatus for calibrating the output signal of a particle counter provided in this application includes a memory and a processor. When the processor executes a program stored in the memory, it can implement the following method: a method for calibrating the output signal of a particle counter.

[0084] The device for calibrating the output signal of a particle counter provided in this application acquires the output signal of the particle counter through a signal acquisition circuit and transmits it to a signal processing module. The signal processing module adjusts the input voltage of the laser based on the output signal to calibrate the output signal of the particle counter. This avoids the influence of factors such as temperature and the stability of the signal amplification circuit in the particle counter on the output signal of the particle counter when the particle counter receives, converts, and amplifies the scattered light from the particles, thereby improving the particle monitoring accuracy of the particle counter.

[0085] Finally, this application also provides an embodiment corresponding to a computer-readable storage medium. The computer-readable storage medium stores a computer program, which, when executed by a processor, implements the steps described in the above method embodiments.

[0086] It is understood that if the methods in the above embodiments are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and executes all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0087] The foregoing has provided a detailed description of a method, system, apparatus, and medium for calibrating the output signal of a particle counter. The various embodiments in the specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to in the method section. It should be noted that those skilled in the art can make various improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

[0088] It should also be noted that, in this specification, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A method for calibrating the output signal of a particle counter, characterized in that, include: The optical noise signal output by the particle counter to be calibrated is acquired; the particle counter to be calibrated includes a laser, a photodetector, and a signal amplification circuit connected to the output terminal of the photodetector, all housed within a housing. When the laser is working, if no particles are being monitored, the photodetector collects optical noise; the optical noise signal is the signal before processing by the signal amplification circuit. If the optical noise signal does not meet the preset conditions, the calibration signal is transmitted to the optical power control circuit so that the optical power control circuit adjusts the operating voltage of the laser in the particle counter to be calibrated until the optical noise signal meets the preset conditions, so as to calibrate the output signal of the particle counter to be calibrated.

2. The method for calibrating the output signal of a particle counter according to claim 1, characterized in that, The preset condition is that the difference between the optical noise signal and the preset value is within a preset range.

3. The method for calibrating the output signal of a particle counter according to claim 2, characterized in that, After determining that the optical noise signal does not meet the preset condition, the method further includes: Determine whether the optical noise signal is greater than a preset warning value; If the value exceeds the preset warning value, an alarm signal will be issued. If the value is not greater than the preset warning value, then proceed to the step of transmitting the calibration signal to the optical power control circuit; wherein the preset warning value is much greater than the preset value.

4. A system for calibrating the output signal of a particle counter, characterized in that, A method for calibrating the output signal of a particle counter according to any one of claims 1 to 3 includes: a signal acquisition circuit and a signal processing module; The input terminal of the signal acquisition circuit is connected to the output terminal of the particle counter to be calibrated, and the output terminal of the signal acquisition circuit is connected to the input terminal of the signal processing module, for transmitting the acquired optical noise signal to the signal processing module; The output of the signal processing module is connected to the input of the optical power control circuit. It is used to determine whether the optical noise signal meets the preset conditions. If the preset conditions are not met, the calibration signal is transmitted to the optical power control circuit so that the optical power control circuit can adjust the operating voltage of the laser in the particle counter to be calibrated in order to calibrate the output signal of the particle counter to be calibrated.

5. The system for calibrating the output signal of a particle counter according to claim 4, characterized in that, The signal acquisition circuit includes a voltage divider circuit and an ADC acquisition circuit; The input terminal of the voltage divider circuit serves as the input terminal of the signal acquisition circuit, the output terminal of the voltage divider circuit is connected to the input terminal of the ADC acquisition circuit, and the output terminal of the ADC acquisition circuit serves as the output terminal of the signal acquisition circuit.

6. The system for calibrating the output signal of a particle counter according to claim 5, characterized in that, The voltage divider circuit includes a first resistor, a second resistor, a capacitor, and an inverting amplifier circuit. The first common terminal of the second resistor and the capacitor connected in parallel is grounded. The common terminal of the second common terminal and one end of the first resistor is connected to the input terminal of the inverting amplifier circuit. The other end of the first resistor serves as the input terminal of the voltage divider circuit, and the output terminal of the inverting amplifier circuit serves as the output terminal of the voltage divider circuit.

7. A device for calibrating the output signal of a particle counter, characterized in that, include: The acquisition module is used to acquire the optical noise signal output by the particle counter to be calibrated; The judgment module is used to determine whether the optical noise signal meets the preset conditions. If the preset conditions are not met, the transmission module is invoked. The transmission module is used to transmit the calibration signal to the optical power control circuit, so that the optical power control circuit adjusts the operating voltage of the laser in the particle counter to be calibrated until the optical noise signal meets the preset conditions, so as to calibrate the output signal of the particle counter to be calibrated; the particle counter to be calibrated includes a laser, a photodetector, and a signal amplification circuit connected to the output terminal of the photodetector, which are disposed in the housing. When the laser is working, if no particles are monitored, the photodetector collects optical noise; the optical noise signal is the signal before processing by the signal amplification circuit.

8. A device for calibrating the output signal of a particle counter, characterized in that, Includes memory used to store computer programs; A processor, configured to execute the computer program to implement the steps of the method for calibrating the output signal of a particle counter as described in any one of claims 1 to 3.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, implements the steps of the method for calibrating the output signal of a particle counter as described in any one of claims 1 to 3.

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