A large closed-loop self-test method for photoelectric signals of an analyzer and related equipment

Abstract

The present application relates to the field of laser gas analyzers, and in particular to a large closed-loop self-test method for an analyzer's photoelectric signal and related equipment. The method comprises: when the analyzer performs normal gas concentration measurement, obtaining the first drive current, maximum current value, and first scanning waveform of the laser; when the analyzer enters the large closed-loop self-test state, adjusting the first drive current to the second drive current, and obtaining the second scanning waveform based on the maximum current value; obtaining the theoretical light intensity based on the preset relationship rules between the second drive current and the first scanning waveform; calculating the measured light intensity at the inflection point between the second stage and the second scanning segment based on the second scanning waveform; comparing the difference between the measured light intensity and the theoretical light intensity with a preset threshold value to determine whether the detected gas concentration value has a detection anomaly. The present application can accurately determine whether the detected gas concentration value has a detection anomaly, thereby effectively improving the reliability of gas concentration detection.

Description

Technical Field

[0001] This application relates to the field of laser gas analyzers, and in particular to a method and related equipment for large closed-loop self-testing of the photoelectric signal of an analyzer. Background Technology

[0002] The ETG-01 laser gas analyzer (hereinafter referred to as the analyzer) is based on the direct absorption spectroscopy method of tunable diode laser absorption spectroscopy (TDLAS). It uses a tunable semiconductor laser at the transmitter as a light source and outputs a sawtooth wave or triangular wave tunable signal to quickly and repeatedly scan the target gas absorption peak position. The detector at the receiver obtains a high-resolution gas absorption signal. Finally, by collecting and analyzing the gas signal, the concentration value of the target gas is obtained.

[0003] Direct absorption spectroscopy can measure gas concentration using only a low-frequency scanning signal without superimposing a high-frequency modulation waveform. However, due to the lack of a high-frequency modulation waveform as a reference signal, the receiver cannot determine the validity of the acquired low-frequency scanning signal. When an invalid received scanning signal is used indiscriminately for analysis and calculation, an incorrect concentration value will be output. Superimposing a reference signal onto the existing low-frequency scanning signal would increase hardware complexity and significantly prolong the system response time, failing to meet the analyzer's performance specifications. Summary of the Invention

[0004] The purpose of this application is to overcome the above-mentioned technical problems and provide a method and related equipment for large closed-loop self-testing of the photoelectric signal of an analyzer, which can accurately determine whether there is an abnormality in the detected gas concentration value, thereby effectively improving the reliability of gas concentration detection.

[0005] In a first aspect, one embodiment of this application discloses a method for large closed-loop self-testing of photoelectric signals in an analyzer, which adopts the following scheme:

[0006] A method for large-loop self-testing of photoelectric signals in an analyzer includes: when the analyzer is performing normal gas concentration measurement, acquiring a first driving current, a maximum current value, and a first scanning waveform of a laser, wherein the first scanning waveform includes a first no-light segment, a first stage, and a first scanning segment; when the analyzer is in a large-loop self-test state, adjusting the first driving current to a second driving current, and acquiring a second scanning waveform based on the maximum current value, wherein the second scanning waveform includes a second no-light segment, a second stage, and a second scanning segment; acquiring a theoretical light intensity based on a preset relationship rule between the second driving current and the first scanning waveform; calculating the measured light intensity at the inflection point between the second stage and the second scanning segment based on the second scanning waveform; and comparing the difference between the measured light intensity and the theoretical light intensity with a preset threshold to determine whether there is a detection anomaly in the detected gas concentration value.

[0007] By employing the above technical solution, the first driving current, maximum current value, and first scanning waveform of the laser are acquired during normal gas concentration measurement by the analyzer. After the analyzer enters the large closed-loop self-test state, the first driving current is adjusted to the second driving current, and the second scanning waveform is acquired based on the maximum current value. The theoretical light intensity is obtained using the preset relationship rules between the second driving current and the first scanning waveform. The measured light intensity at the inflection point between the second stage and the second scanning segment is calculated by combining the second scanning waveform. By comparing the difference between the measured light intensity and the theoretical light intensity with a preset threshold, it is determined whether there is an anomaly in the gas concentration detection. In this way, the large closed-loop self-test method for the analyzer's photoelectric signal can obtain the theoretical and measured light intensities by adjusting the driving current and scanning waveform without affecting normal measurement, and determine whether there is an anomaly in the gas concentration detection by comparing the difference with a preset threshold, thereby effectively improving the reliability of the detection results.

[0008] Optionally, the second driving current can be determined as follows:

[0009] i test = [(i scan - i step ) / n] + i step ;

[0010] Among them, i scan For the maximum current value, i step The first driving current is denoted as n, and the photocurrent self-test factor is denoted as n, which takes a value greater than 1.

[0011] By adopting the above technical solution, the second driving current can be accurately calculated, thereby improving the accuracy of theoretical light intensity calculation and ensuring more reliable detection results. Specifically, by setting a photocurrent self-test factor n and using this factor to calculate the second driving current i... testThis allows for the acquisition of accurate theoretical light intensity values ​​under different self-testing conditions, thereby improving the accuracy and reliability of the entire closed-loop self-testing process.

[0012] Optionally, the preset relationship rule is that on the ramp line in the first scan segment, the following relationship is satisfied:

[0013] (i step - i th ): I0(t1) = (i test - i step ): [I ref [(t1) - I0(t1)];

[0014] Among them, i th Let It1 be the laser threshold current, and I0(t1) be the constant light intensity output by the laser during the first stage. ref (t1) represents the constant light intensity output by the laser in the second stage.

[0015] By adopting the above technical solution, the proportional relationship between the theoretical light intensity and the actual measured parameters on the straight line of the first scanning segment slope can be accurately established, thereby improving the accuracy of theoretical light intensity calculation and ensuring accurate and reliable detection results.

[0016] Optionally, the formula for calculating the theoretical light intensity is as follows:

[0017] I ref (t1) = {1 + (i scan - i step ) / [n*(i step - i th )]}* I0(t1).

[0018] By adopting the above technical solution, the theoretical light intensity can be accurately calculated under the large closed-loop self-test state, thereby improving the accuracy of gas concentration detection during the large closed-loop self-test process.

[0019] Optionally, the first scanning waveform and the second scanning waveform are acquired by controlling the laser current through the driving module of the transmitter.

[0020] By adopting the above technical solution, the first and second scanning waveforms are acquired by controlling the laser current through the driving module of the transmitter, which realizes precise control of the laser current and ensures accurate measurement of light intensity, thereby improving the accuracy and reliability of gas concentration detection.

[0021] Optionally, it also includes: when switching back and forth between the large closed-loop self-test state and the normal gas concentration measurement state, the corresponding first driving current and the second driving current are switched back and forth.

[0022] By adopting the above technical solution, when switching back and forth between the large closed-loop self-test state and the normal gas concentration measurement state, it can quickly adapt to the needs of different working modes, ensure the stability and accuracy of the system, and improve detection efficiency and reliability.

[0023] Secondly, one embodiment of this application discloses an analyzer measurement system, which adopts the following scheme:

[0024] An analyzer measurement system includes: a transmitting unit and a receiving unit. The transmitting unit includes a laser, a driving module, and a collimating lens, and the laser is electrically connected to the driving module. The receiving unit includes a converging lens and a detector, a data acquisition module, a spectral data processing module, and a signal output module that are electrically connected to each other.

[0025] By adopting the above technical solution, the analyzer measurement system effectively applies the large closed-loop self-test method for the analyzer's photoelectric signal through the setting of the transmitting and receiving units. The laser in the transmitting unit has its current precisely controlled by the driving module, ensuring accurate switching between the first and second driving currents, thereby guaranteeing accurate measurement of light intensity during the self-test process. The detector and processing module in the receiving unit can accurately acquire the actual light intensity and compare it with the theoretical light intensity, effectively determining whether the gas concentration value detection is abnormal, thus improving the stability and accuracy of the analyzer measurement system.

[0026] Optionally, it also includes a DC power supply for connecting the transmitting unit and the receiving unit respectively.

[0027] By adopting the above technical solution, a DC power supply is added, which not only ensures a stable power supply for the transmitting and receiving units, but also enables the transmitting and receiving units to be connected by cables to realize data communication functions, thereby ensuring the reliability and stability of the entire system.

[0028] Thirdly, one embodiment of this application discloses a large closed-loop self-test device for the photoelectric signal of an analyzer, which adopts the following scheme:

[0029] An electronic device includes: a memory and a processor, the memory being used to store a computer program; the processor being used to execute the computer program to implement the steps of the large closed-loop self-test method for photoelectric signals of an analyzer as described in any of the preceding claims.

[0030] Fourthly, one embodiment of this application discloses a computer-readable storage medium, which adopts the following scheme:

[0031] A computer-readable storage medium storing a computer program, which, when executed by a processor, implements the steps of the above-described method for a large closed-loop self-test of an analyzer's photoelectric signal.

[0032] In summary, this application includes at least one of the following beneficial technical effects:

[0033] 1. By acquiring the first driving current, maximum current value, and first scan waveform when the analyzer is normally measuring gas concentration, and adjusting the first driving current to the second driving current to acquire the second scan waveform under the large closed-loop self-test state, the misjudgment caused by the invalid low-frequency scan signal can be reduced, and the detection accuracy can be improved.

[0034] 2. The theoretical light intensity is obtained based on the preset relationship rules in the second driving current and the first scanning waveform, and the measured light intensity is calculated in combination with the second scanning waveform. By comparing the difference with the preset threshold, it is determined whether the gas concentration value is abnormal, thereby improving the reliability of the analyzer for detection results.

[0035] 3. When switching between the closed-loop self-test state and the normal gas concentration measurement state, the hardware design is simplified and the system response time is shortened by adjusting the first drive current and the second drive current accordingly, thus meeting the product performance indicators of the analyzer. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the structure of a large closed-loop self-test system for photoelectric signals of an analyzer disclosed in an embodiment of this application.

[0037] Figure 2 A schematic diagram of the scan waveform output by the analyzer during normal gas concentration measurement;

[0038] Figure 3 A schematic diagram of the waveform changes after the analyzer performs a large closed-loop self-test.

[0039] Figure 4 This is a flowchart illustrating a large closed-loop self-test method for the photoelectric signal of an analyzer, as disclosed in another embodiment of this application.

[0040] Figure 5 This is a schematic diagram of the structure of an electronic device disclosed in another embodiment of this application.

[0041] Explanation of reference numerals in the attached figures:

[0042] 10. Transmitting unit; 11. Laser; 12. Driving module; 13. Collimating lens; 20. Receiving unit; 21. Converging lens; 22. Detector; 23. Data acquisition module; 24. Spectral data processing module; 25. Signal output module; 30. DC power supply. Detailed Implementation

[0043] The present application will be further described in detail below with reference to the accompanying drawings.

[0044] Embodiments of this application will now be described in more detail with reference to the accompanying drawings. While embodiments of this application are shown in the drawings, it should be understood that this application may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to make this application more thorough and complete, and to fully convey the scope of this application to those skilled in the art.

[0045] The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The singular forms “a” and “the” as used in this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0046] It should be understood that although the terms "first," "second," "third," etc., may be used in this application to describe various information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of this application, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0047] The technical solutions of the embodiments of this application are described in detail below with reference to the accompanying drawings.

[0048] [First Embodiment]

[0049] See Figure 1 The first embodiment of this application discloses an analyzer measurement system, including: a transmitting unit 10, a receiving unit 20 and a DC power supply 30. The transmitting unit 10 includes a laser 11, a driving module 12 and a collimating lens 13. The receiving unit 20 includes a converging lens 21, a detector 22, a data acquisition module 23, a spectral data processing module 24 and a signal output module 25.

[0050] The laser 11 is electrically connected to the drive module 12, and the detector 22, data acquisition module 23, spectral data processing module 24 and signal output module 25 are electrically connected to each other. The transmitting unit 10 and the receiving unit 20 are electrically connected via a DC power supply 30. This not only ensures a stable power supply for the transmitting unit 10 and the receiving unit 20, but also enables data communication between the transmitting unit 10 and the receiving unit 20 via cables, thereby ensuring the reliability and stability of the entire system.

[0051] Specifically, the drive module 12 controls the temperature of the laser 11 and modulates the current of the laser 11. The laser beam emitted by the laser 11 (corresponding to the modulation signal) passes through the collimating lens 13 and the target detection gas in sequence, and then shines on the detector 22 through the converging lens 21. After photoelectric conversion, the data acquisition module 23 restores the modulation signal at a certain ratio, and then the spectral data processing module 24 performs filtering processing and gas concentration calculation on the modulation signal. Finally, the signal output module 25 outputs the concentration value to the outside in the form of a 4-20mA current characterization.

[0052] In this embodiment, the analyzer measurement system alternately performs two main tasks: normal gas concentration measurement and system closed-loop self-test. The receiving unit 20, i.e. the receiving end, controls the system to switch back and forth between the normal gas concentration measurement state and the system closed-loop self-test state.

[0053] When the analyzer enters the large closed-loop self-test state, the receiver controls the laser 11 drive module 12 of the transmitter (transmitter unit 10) to adjust the drive current of the laser 11. The corresponding receiver acquires a new modulation signal, and at a specific time of the modulation signal (e.g., Figure 2 The light intensity value is extracted within the time period t0-t2 shown, and compared with the expected light intensity value (theoretical light intensity) to determine whether an abnormality has occurred in the large closed loop of the system. Finally, the receiver controls the laser 11 of the transmitter to restore the driving current during normal measurement and return to the normal measurement state.

[0054] Specifically, when the analyzer performs normal gas concentration measurement, the laser 11 driver module 12 at the transmitting end controls the laser 11 to output as follows: Figure 2 The scanning waveform is shown. Time 0-t0 represents the no-light segment, indicating the laser 11's off-current; time t0-t1 represents the peak segment, where the laser 11's drive current is constant at i. step Its value is greater than the laser 11 threshold current i th Laser 11 outputs a constant light intensity I0(t1); time t1-t2 is the scanning segment, and the driving current of laser 11 changes from i step Initially, the current gradually increases in a linear ramp manner, with the maximum current value being i. scan The maximum light intensity output by laser 11 is I0(t2).

[0055] After the analyzer enters the large closed-loop self-test state, the driving current of laser 11 during the stage is changed from i step Adjust to i test The maximum current value i in the scanning segment scan The modulation signal of the corresponding laser 11 remains unchanged. Figure 3 The scanning waveform shown in orange indicates that the output light intensity of the stage becomes I. ref (t1). Where i test Use the following formula to retrieve the value:

[0056] i test = [(i scan - i step ) / n] + i step (Formula 1);

[0057] Where n is the photocurrent self-checking factor, and its value is greater than 1. It is worth mentioning that by configuring the value of n, i can be... test The influence of light intensity within the gas absorption region should be reasonably avoided. The value of n can be preset based on the actual situation.

[0058] See Figure 3 The current and light intensity values ​​before and after adjustment, on the ramp line of the normal gas concentration measurement scan waveform, the two red-shaded triangles satisfy the following trigonometric relationship:

[0059] A : B = C : D (Formula 2);

[0060] Right now:

[0061] (i step - i th ): I0(t1) = (i test - i step ): [I ref (t1) - I0(t1)]; (Formula 3);

[0062] The theoretical light intensity after adjusting the stage current can be calculated using formulas 1 and 3:

[0063] I ref (t1) = {1 + (i scan - i step ) / [n*(i step - i th )]}* I0(t1) (Formula 4);

[0064] At the receiving end, the measured light intensity I at time t1 is calculated using the inflection point P between the stage and the scanning segment. test(t1) and theoretical light intensity I ref If the error between (t1) does not exceed a certain threshold, it can be determined whether there is an anomaly in the large closed loop of the system. When it does not exceed the threshold, it is determined that there is no anomaly, and when it exceeds the threshold, it is determined that there is an anomaly.

[0065] After completing the large closed-loop self-test, the driving current of the stage laser 11 is changed by i test Restore to i step The scanning waveform of laser 11 is then recovered. Figure 2 The waveform shown indicates that the analyzer's measurement system has switched from the large closed-loop self-test state back to the normal gas concentration measurement state.

[0066] In summary, the analyzer measurement system disclosed in the first embodiment of this application can achieve anomaly diagnosis within the system closed loop with minimal modifications, without requiring additional hardware design and leveraging the characteristics of existing laser modulation signals. Furthermore, it can identify anomalies within the system closed loop without adding a high-frequency modulation signal to the low-frequency scanning signal of the laser 11, saving unnecessary signal modulation and demodulation time and ensuring the system's rapid response advantage. Specifically, in this embodiment, the effective application of the large closed-loop self-test method for the analyzer's photoelectric signal is achieved solely through the configuration of the transmitting unit 10 and the receiving unit 20. The laser 11 within the transmitting unit 10 has its current precisely controlled by the driving module 12, ensuring accurate switching between the first and second driving currents, thereby guaranteeing accurate measurement of light intensity during the self-test process. The detector 22 and the spectral data processing module 24 within the receiving unit 20 can accurately acquire the actual light intensity and compare it with the theoretical light intensity to effectively determine whether the gas concentration value detection is abnormal, improving the stability and accuracy of the analyzer measurement system.

[0067] [Second Embodiment]

[0068] Please see Figure 4 The second embodiment of this application discloses a large closed-loop self-test method for the photoelectric signal of an analyzer, which is applied to the analyzer measurement system described in the first embodiment above, and specifically includes the following steps:

[0069] S10. When the analyzer is performing normal gas concentration measurement, acquire the first drive current, maximum current value and first scan waveform of the laser.

[0070] The first scanning waveform is the output waveform of the laser 11 controlled by the laser 11 drive module 12. Figure 2 The scan waveform shown includes: a first no-light segment (0-t0), a first stage (t0-t1), and a first scan segment (t1-t2). The first driving current in the first stage is i. stepThe constant light intensity output by the corresponding laser 11 is I0(t1); the driving current of the laser 11 in the first scanning segment starts from i step Initially, the current gradually increases in a linear ramp manner, with the maximum current value being i. scan The maximum light intensity output by the corresponding laser 11 is I0(t2).

[0071] S20. After the analyzer enters the large closed-loop self-test state, the first drive current is adjusted to the second drive current, and the second scan waveform is obtained based on the maximum current value.

[0072] Among them, the driving current of the stage is i step Adjust to i test As the second driving current, the maximum current value i of the scanning segment scan It remains unchanged. The corresponding modulation signal of laser 11 is changed to... Figure 3 The orange scan waveform, also known as the second scan waveform, includes the second dark segment (0-t0), the second stage (t0-t1), and the second scan segment (t1-t2).

[0073] It is worth mentioning here regarding i test The value is determined as follows:

[0074] i test = [(i scan - i step ) / n] + i step ;

[0075] Among them, i scan i is the maximum current value. step Let be the first driving current, and n be the photocurrent self-checking factor, with a value greater than 1. In this embodiment, by configuring the value of n, i can be... test The influence of light intensity in the gas absorption region should be reasonably avoided. The specific value of n can be preset according to the actual situation.

[0076] S30. Based on the preset relationship rules between the second driving current and the first scanning waveform, obtain the theoretical light intensity;

[0077] The preset relationship rule is that on the ramp line in the first scan segment, the following relationship must be satisfied:

[0078] (i step - i th ): I0(t1) = (i test - i step ): [I ref [(t1) - I0(t1)];

[0079] Among them, i thLet It1 be the threshold current of laser 11, and I0(t1) be the constant light intensity output by laser 11 in the first stage. ref (t1) represents the theoretical light intensity. The corresponding formula for calculating the theoretical light intensity is:

[0080] I ref (t1) = {1 + (i scan - i step ) / [n*(i step - i th )]}* I0(t1).

[0081] Thus, the setting of step S30 can accurately establish the proportional relationship between the theoretical light intensity and the actual measured parameters on the straight line of the first scanning segment slope, thereby improving the accuracy of theoretical light intensity calculation and ensuring that the detection results are accurate and reliable.

[0082] S40. Calculate the measured light intensity at the inflection point between the second stage and the second scanning segment based on the second scanning waveform.

[0083] Among them, corresponding to Figure 3 In the diagram, the inflection point is defined as P, and the measured light intensity of P at time t1 is I. test (t1), where the measured light intensity can be obtained in the spectral data processing module 24.

[0084] S50. Compare the difference between the measured light intensity and the theoretical light intensity with the preset threshold to determine whether there is any abnormality in the detected gas concentration value.

[0085] Among them, a preset threshold, such as 5% of the difference between the two, is used to determine whether there is an abnormality in the gas concentration detection by comparing the difference with the preset threshold, which can effectively improve the reliability of gas concentration detection.

[0086] Furthermore, in this embodiment, the first and second scanning waveforms are acquired by controlling the current of the laser 11 through the driving module 12 of the transmitting end. This allows for precise control of the laser 11 current, ensuring accurate measurement of light intensity and thus improving the accuracy and reliability of gas concentration detection.

[0087] Furthermore, it is worth mentioning that in this embodiment, when switching back and forth between the large closed-loop self-test state and the normal gas concentration measurement state, the corresponding first drive current and second drive current switch back and forth. This allows for rapid adaptation to the needs of different operating modes when switching between the large closed-loop self-test state and the normal gas concentration measurement state, ensuring the stability and accuracy of the system and improving detection efficiency and reliability.

[0088] In summary, the first embodiment of this invention discloses a large closed-loop self-test method for the photoelectric signal of an analyzer. By acquiring the first driving current, maximum current value, and first scanning waveform of the laser 11 during normal gas concentration measurement, and adjusting to the second driving current and acquiring the second scanning waveform after entering the large closed-loop self-test state, this effectively solves the technical problem in the background art where the direct absorption spectroscopy method cannot determine the validity of the signal due to the lack of a high-frequency modulation waveform as a reference signal. Based on the second scanning waveform, the measured light intensity at the inflection point is calculated and compared with the theoretical light intensity to determine whether there is a detection anomaly in the gas concentration value, avoiding erroneous concentration value output caused by invalid signals and improving the accuracy and reliability of detection. This method achieves the self-test function without increasing hardware complexity or extending system response time, meeting product performance requirements. Furthermore, the switching of the laser 11 current makes the switching between gas concentration measurement and self-test states more flexible and efficient.

[0089] [Third Embodiment]

[0090] Please see Figure 5 In the third embodiment of this application, an electronic device is disclosed, comprising: a memory 61 and a processor 62. The memory 61 is used to store a computer program; the processor 62 is used to execute the computer program to implement the steps of the analyzer photoelectric signal large closed-loop self-test method described in the first embodiment above, which can be referred to above for details and will not be described in detail here. The technical effect of the analyzer photoelectric signal large closed-loop self-test device provided in this embodiment in practical application is the same as the technical effect of the analyzer photoelectric signal large closed-loop self-test method in the first embodiment.

[0091] [Fourth Embodiment]

[0092] A computer-readable storage medium is disclosed in the fourth embodiment of this application. The computer-readable storage medium is, for example, a non-volatile memory, such as magnetic media (e.g., hard disks, floppy disks, and magnetic tapes), optical media (e.g., CD-ROMs and DVDs), magneto-optical media (e.g., optical discs), and hardware devices specifically configured for storing and executing computer-executable instructions (e.g., read-only memory (ROM), random access memory (RAM), flash memory, etc.). A computer program is stored on the computer-readable storage medium. The computer-readable storage medium can be executed by one or more processors or processing devices to implement a large closed-loop self-test method for analyzer photoelectric signals according to the foregoing embodiments.

[0093] Furthermore, it is understood that the foregoing embodiments are merely illustrative examples of the present invention. Provided that the technical features do not conflict, the structure is not contradictory, and the purpose of the invention is not violated, the technical solutions of the various embodiments can be arbitrarily combined and used.

[0094] In the embodiments provided by this invention, it should be understood that the disclosed methods, systems, and devices can be implemented in other ways. For example, the modules included in the systems described above are merely illustrative, and the division of modules is only a logical functional division. In actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be indirect coupling or communication connection through some interfaces, devices, or units, and may be electrical, mechanical, or other forms.

[0095] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0096] Furthermore, in the various embodiments of the present invention, the functional units / modules can be integrated into one processing unit / module, or each unit / module can exist physically separately, or two or more units / modules can be integrated into one unit / module. The integrated unit / module described above can be implemented in hardware or in the form of hardware plus software functional units / modules.

[0097] The integrated units / modules implemented as software functional units / modules described above can be stored in a computer-readable storage medium. The software functional units stored in this storage medium include several instructions to cause one or more processors of a computer device (which may be a personal computer, server, or network device, etc.) to execute some 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.

[0098] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for large closed-loop self-test of photoelectric signals in an analyzer, characterized in that, include: When the analyzer performs normal gas concentration measurement, it acquires the first drive current, maximum current value and first scan waveform of the laser. The first scan waveform includes: first no-light segment, first stage and first scan segment. After the analyzer performs a large closed-loop self-test, the first drive current is adjusted to the second drive current, and the second scan waveform is obtained based on the maximum current value. The second scan waveform includes a second no-light segment, a second stage, and a second scan segment. The theoretical light intensity is obtained based on the preset relationship rules between the second driving current and the first scanning waveform. The measured light intensity at the inflection point between the second stage and the second scanning segment is calculated based on the second scanning waveform. The difference between the measured light intensity and the theoretical light intensity is compared with a preset threshold to determine whether there is an abnormality in the detected gas concentration value. The second driving current is determined as follows: i test = [(i scan - i step ) / n] + i step ; Among them, i scan For the maximum current value, i step The first driving current is denoted as n, which is the photocurrent self-test factor and has a value greater than 1. The preset relationship rule is that on the slope line in the first scan segment, the following relationship is satisfied: (i step - i th ) :I0(t1) = (i test - i step ) :[I ref (t1) - I0(t1)]; Among them, i th Let It1 be the laser threshold current, and I0(t1) be the constant light intensity output by the laser during the first stage. ref (t1) represents the theoretical light intensity; The formula for calculating the theoretical light intensity is as follows: I ref (t1)= {1 + (i scan - i step ) / [n*(i step - i th )]}* I0(t1).

2. The method according to claim 1, characterized in that, The first and second scanning waveforms are acquired by controlling the laser current through the driving module of the transmitter.

3. The method according to claim 1, characterized in that, Also includes: When switching back and forth between the large closed-loop self-test state and the normal gas concentration measurement state, the corresponding first driving current and second driving current switch back and forth.

4. An analyzer measurement system, applied to the self-testing method according to any one of claims 1-3, characterized in that, include: The system includes a transmitting unit and a receiving unit. The transmitting unit comprises a laser, a driving module, and a collimating lens. The laser is electrically connected to the driving module. The receiving unit includes a converging lens and a detector, a data acquisition module, a spectral data processing module, and a signal output module that are electrically connected to each other; wherein, the receiving unit is used to control the system to switch back and forth between the normal gas concentration measurement state and the system's large closed-loop self-test state.

5. The measurement system according to claim 4, characterized in that, Also includes: A DC power supply is used to connect the transmitting unit and the receiving unit, respectively.

6. An electronic device, characterized in that, include: The memory and the processor, wherein the memory is used to store a computer program; and the processor is used to execute the computer program to implement the steps of the large closed-loop self-test method for the photoelectric signal of an analyzer as described in any one of claims 1 to 3.

7. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program, which, when executed by a processor, implements the steps of the large closed-loop self-test method for the photoelectric signal of an analyzer as described in any one of claims 1 to 3.

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