Analyzer photoelectric signal large closed-loop self-checking method and related equipment

Abstract

The invention relates to the field of laser gas analyzers, in particular to an analyzer photoelectric signal large closed-loop self-checking method and related equipment. The method comprises the following steps: when an analyzer performs normal gas concentration measurement, acquiring a first driving current, a maximum current value and a first scanning waveform of a laser; when the analyzer is in a large closed-loop self-checking state, adjusting the first driving current to a second driving current, and obtaining a second scanning waveform based on the maximum current value; obtaining theoretical light intensity based on a preset relation rule in the second driving current and the first scanning waveform; calculating actually measured light intensity at an inflection point between the second step section and the second scanning section based on the second scanning waveform; and comparing the difference value between the actually measured light intensity and the theoretical light intensity with a preset threshold value to judge whether the detected gas concentration value is abnormal or not. According to the method, whether the detected gas concentration value is abnormal or not can be accurately determined, so that the reliability of gas concentration detection is effectively improved.

Description

Technical Field

[0001] The present application relates to the field of laser gas analyzers, and in particular to a large closed-loop self-checking method for photoelectric signals of analyzers and related equipment. Background Art

[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 the tunable semiconductor laser at the transmitting end as the light source, and outputs tuning signals such as sawtooth waves or triangle waves to quickly and repeatedly scan the absorption peak position of the target gas. The detector at the receiving end obtains a high-resolution gas absorption signal, and finally obtains the concentration value of the target gas by collecting, analyzing and calculating the gas signal.

[0003] Among them, the direct absorption spectroscopy method can measure gas concentration by 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 receiving end cannot determine whether the acquired low-frequency scanning signal is valid. When the invalid received scanning signal is used for analysis and calculation without distinction, an incorrect concentration value will be output. If a reference signal is to be superimposed on the existing low-frequency scanning signal, the hardware complexity will be increased, and the response time of the system will be greatly prolonged, which cannot meet the product performance indicators of the analyzer. Summary of the invention

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

[0005] In a first aspect, an embodiment of the present application discloses a large closed-loop self-test method for photoelectric signals of an analyzer, which adopts the following scheme: A large closed-loop self-check method for an analyzer photoelectric signal comprises: when the analyzer performs normal gas concentration measurement, obtaining a first driving current, a maximum current value and a first scanning waveform of a laser, wherein the first scanning waveform comprises a first lightless section, a first stage and a first scanning section; when the analyzer enters a large closed-loop self-check state, adjusting the first driving current to a second driving current, and obtaining a second scanning waveform based on the maximum current value, wherein the second scanning waveform comprises a second lightless section, a second stage and a second scanning section; obtaining 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 section 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 there is any detection abnormality in the detected gas concentration value.

[0006] By adopting the above technical solution, the first driving current, maximum current value and first scanning waveform of the laser are obtained when the analyzer performs normal measurement of gas concentration, and the first driving current is adjusted to the second driving current after the analyzer enters the large closed-loop self-test state, and the second scanning waveform is obtained based on the maximum current value. The theoretical light intensity is obtained by using the preset relationship rule between the second driving current and the first scanning waveform, and the measured light intensity at the inflection point between the second stage and the second scanning segment is calculated in combination with the second scanning waveform. By comparing the difference between the measured light intensity and the theoretical light intensity with the preset threshold, it is judged whether there is an abnormality in the detection of the gas concentration value. In this way, the large closed-loop self-test method of the photoelectric signal of the analyzer can obtain the theoretical light intensity and the measured light intensity by adjusting the driving current and the scanning waveform without affecting the normal measurement, and judge whether there is an abnormality in the gas concentration detection by comparing the difference with the preset threshold, thereby effectively improving the reliability of the detection result.

[0007] Optionally, the second driving current is taken as follows: i test = [(i scan -i step ) / n] + i step ; Among them, i scan is the maximum current value, i step is the first driving current, n is the photocurrent self-detection factor, and its value is greater than 1.

[0008] By adopting the above technical solution, the second driving current can be accurately calculated, thereby improving the accuracy of the theoretical light intensity calculation and ensuring that the detection result is more reliable. Specifically, by setting the photocurrent self-detection factor n and using the factor to calculate the second driving current i test , so that accurate theoretical light intensity values ​​can be obtained under different self-test conditions, thereby improving the accuracy and reliability of the entire closed-loop self-test process.

[0009] Optionally, the preset relationship rule is that on the slope straight line in the first scanning 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 is the laser threshold current, I0(t1) is the constant light intensity output by the laser in the first stage, I ref (t1) is the constant light intensity output by the laser in the second stage.

[0010] By adopting the above technical solution, the proportional relationship between the theoretical light intensity on the slope straight line of the first scanning section and the actual measurement parameter can be accurately established, thereby improving the calculation accuracy of the theoretical light intensity and ensuring that the detection result is accurate and reliable.

[0011] Optionally, the calculation formula of the theoretical light intensity is as follows: I ref (t1) = {1 + (i scan -i step ) / [n*(i step -i th )]}* I0(t1).

[0012] By adopting the above technical solution, the theoretical light intensity can be accurately calculated in the large closed-loop self-test state, thereby improving the accuracy of gas concentration detection during the large closed-loop self-test process.

[0013] Optionally, the first scanning waveform and the second scanning waveform are obtained by controlling the current of the laser through a driving module at the transmitting end.

[0014] By adopting the above technical solution, the first scanning waveform and the second scanning waveform are obtained by controlling the current of the laser through the driving module at the transmitting end, thereby realizing precise control of the laser current and ensuring accurate measurement of the light intensity, thereby improving the accuracy and reliability of gas concentration detection.

[0015] Optionally, it also includes: when the large closed-loop self-check state and the normal gas concentration measurement state are switched back and forth, the corresponding first drive current and the second drive current are switched back and forth.

[0016] 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 is possible to quickly adapt to the requirements of different working modes, ensure the stability and accuracy of the system, and improve detection efficiency and reliability.

[0017] In a second aspect, an embodiment of the present application discloses an analyzer measurement system, which adopts the following scheme: An analyzer measurement system comprises: a transmitting unit and a receiving unit, wherein the transmitting unit comprises a laser, a driving module and a collimating lens, and the laser is electrically connected to the driving module; and the receiving unit comprises a converging lens and a detector, a data acquisition module, a spectrum data processing module and a signal output module which are electrically connected to each other.

[0018] By adopting the above technical scheme, the analyzer measurement system realizes the effective application of the large closed-loop self-test method of the analyzer photoelectric signal through the setting of the transmitting unit and the receiving unit, wherein the laser in the transmitting unit is accurately controlled by the driving module to ensure the accurate switching of the first driving current and the second driving current, thereby ensuring the accurate measurement of the light intensity during the self-test process; the detector and processing module in the receiving unit can accurately obtain the actual light intensity and compare it with the theoretical light intensity, effectively determine whether the detection of the gas concentration value is abnormal, and improve the stability and accuracy of the analyzer measurement system.

[0019] Optionally, it also includes: a direct current power supply, used to connect the transmitting unit and the receiving unit respectively.

[0020] By adopting the above technical solution, a DC power supply is added, which not only ensures the stable power supply of the transmitting unit and the receiving unit, but also enables the transmitting unit and the receiving unit to be connected through a cable to realize the data communication function, thereby ensuring the reliability and stability of the entire system.

[0021] In a third aspect, an embodiment of the present application discloses a large closed-loop self-test device for photoelectric signals of an analyzer, which adopts the following scheme: An electronic device comprises: a memory and a processor, wherein the memory is used to store a computer program; and the processor is used to implement the steps of a large closed-loop self-test method for photoelectric signals of an analyzer as described in any one of the above when executing the computer program.

[0022] In a fourth aspect, an embodiment of the present application discloses a computer-readable storage medium, which adopts the following scheme: A computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the large closed-loop self-test method for photoelectric signals of an analyzer as described above are implemented.

[0023] In summary, the present application includes at least one of the following beneficial technical effects: 1. By obtaining the first drive current, the maximum current value and the first scanning waveform when the analyzer normally measures the gas concentration, and adjusting the first drive current to the second drive current to obtain the second scanning waveform in the large closed-loop self-test state, it is possible to reduce misjudgment caused by invalid low-frequency scanning signals and improve the accuracy of detection; 2. The theoretical light intensity is obtained based on the preset relationship rule between 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's detection results; 3. When switching back and forth between the large closed-loop self-check state and the normal gas concentration measurement state, the hardware design is simplified and the response time of the system is shortened by correspondingly adjusting the first drive current and the second drive current, thereby meeting the product performance indicators of the analyzer. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic structural diagram of a large closed-loop self-checking system for photoelectric signals of an analyzer disclosed in one embodiment of the present application.

[0025] Figure 2 This is a schematic diagram of the scanning waveform output by the analyzer when performing normal gas concentration measurement; Figure 3 This is a schematic diagram of the scanning waveform changes after the analyzer enters the large closed-loop self-test state; Figure 4 A schematic flow chart of a large closed-loop self-test method for photoelectric signals of an analyzer disclosed in another embodiment of the present application; Figure 5 This is a schematic diagram of the structure of an electronic device disclosed in yet another embodiment of the present application.

[0026] Description of reference numerals: 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 DESCRIPTION

[0027] The present application is further described in detail below in conjunction with the accompanying drawings.

[0028] The embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although the embodiments of the present application are shown in the accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art.

[0029] The terms used in this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The singular forms of "a", "an" and "the" used in this application and the appended claims are also intended to include plural forms unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0030] 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 the same type of information from each other. For example, without departing from the scope of this application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0031] The technical solution of the embodiments of the present application is described in detail below with reference to the accompanying drawings.

[0032] [First embodiment] See also Figure 1 In the first embodiment of the present application, an analyzer measurement system is disclosed, 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, and 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.

[0033] Among them, the laser 11 is electrically connected to the driving module 12, the detector 22, the data acquisition module 23, the spectral data processing module 24 and the signal output module 25 are electrically connected to each other, and the transmitting unit 10 and the receiving unit 20 are electrically connected via a DC power supply 30, so as to not only ensure the stable power supply of the transmitting unit 10 and the receiving unit 20, but also realize data communication between the transmitting unit 10 and the receiving unit 20 through cables, thereby ensuring the reliability and stability of the entire system.

[0034] Specifically, the driving module 12 controls the temperature of the laser 11 and modulates the current of the laser 11. The laser beam (corresponding to the modulation signal) emitted by the laser 11 passes through the collimating lens 13 and the target detection gas in turn, and then irradiates the detector 22 through the converging lens 21. After photoelectric conversion, the data acquisition module 23 restores the modulation signal in a certain proportion, and then the spectral data processing module 24 filters the modulation signal and calculates the gas concentration. Finally, the concentration value is output to the outside in the form of 4-20mA current representation through the signal output module 25.

[0035] In this embodiment, the analyzer measurement system alternately performs two main tasks: normal gas concentration measurement and system large 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 large closed-loop self-test state.

[0036] After the analyzer enters the large closed-loop self-test state, the receiving end controls the laser 11 driving module 12 of the transmitting end (transmitting unit 10) to adjust the driving current of the laser 11, and the corresponding receiving end obtains the new modulation signal. Figure 2 The light intensity value is extracted during the time period t0-t2 shown in the figure, and compared with the expected light intensity value (theoretical light intensity) to determine whether an abnormality occurs in the large closed loop of the system. Finally, the receiving end controls the laser 11 at the transmitting end to restore the driving current during normal measurement and return to the normal measurement state.

[0037] Specifically, when the analyzer performs normal measurement of gas concentration, the laser 11 driving module 12 at the transmitting end controls the laser 11 to output as follows: Figure 2 The scanning waveform is shown in FIG. 1 . The time 0-t0 is a lightless period, indicating that the laser 11 turns off the current; the time t0-t1 is a stage period, and the driving current of the laser 11 is constant at i step , whose value is greater than the threshold current i of the laser 11 th , the laser 11 outputs a constant light intensity I0(t1); the time t1-t2 is the scanning section, and the laser 11 drives the current from i step At the beginning, it gradually increases in a linear ramp manner, and the maximum current value is i scan , the maximum light intensity output by laser 11 is I0(t2).

[0038] After the analyzer enters the large closed loop self-test state, the driving current of the laser 11 is i step Adjust to i test , and the maximum current value i of the scanning segment scan remains unchanged, and the corresponding modulation signal of the laser 11 is changed to Figure 3 The scanning waveform shown in orange in the middle shows that the output light intensity of the stage changes to I ref (t1). test Use the following formula to get the value: i test = [(i scan -i step ) / n] + i step (Formula 1); Among them, n is the photocurrent self-detection factor, which is greater than 1. It is worth mentioning that by configuring the n value, i test Reasonably avoid the influence of light intensity in the gas absorption range. The value of n can be pre-set according to the actual situation.

[0039] See also Figure 3 , the current and light intensity values ​​before and after adjustment. On the slope straight line of the normal gas concentration measurement scanning waveform, the two red-shaded triangles satisfy the following triangular relationship: A : B = C : D (Formula 2); Right now: (i step -i th ) :I0(t1) = (i test -i step ):[I ref (t1) - I0(t1)]; (Formula 3); By using formula 1 and formula 3, the theoretical light intensity after adjusting the stage current can be calculated: I ref (t1) = {1 + (i scan -i step ) / [n*(i step -i th )]}* I0(t1) (Formula 4); At the receiving end, the measured light intensity I at the inflection point P of the stage stage and the scanning segment at time t1 is calculated. test (t1) and theoretical light intensity I ref If the error between (t1) and (t2) does not exceed a certain threshold, it can be determined whether there is an abnormality in the system closed loop. When it does not exceed the threshold, it is determined that there is no abnormality; when it exceeds the threshold, it is determined that there is an abnormality.

[0040] After completing the large closed-loop self-check, the laser 11 driving current is i test Restore to i step , the scanning waveform of the laser 11 is restored to Figure 2 As shown in the waveform, the analyzer measurement system switches from the large closed-loop self-check state back to the normal gas concentration measurement state.

[0041] In summary, an analyzer measurement system disclosed in the first embodiment of the present application can realize abnormal diagnosis in the closed loop of the system with minimal changes without adding additional hardware design and mining the characteristics of the existing laser modulation signal; and can identify abnormalities in the closed loop of the system without adding a high-frequency modulation signal to the low-frequency scanning signal of the laser 11, thereby eliminating unnecessary signal modulation and demodulation time and ensuring the rapid response advantage of the system. Specifically, in this embodiment, only by setting the transmitting unit 10 and the receiving unit 20, the effective application of the large closed-loop self-test method of the photoelectric signal of the analyzer is realized, wherein the laser 11 in the transmitting unit 10 is accurately controlled by the driving module 12 to ensure the accurate switching of the first driving current and the second driving current, thereby ensuring the accurate measurement of the light intensity during the self-test process; the detector 22 and the spectral data processing module 24 in the receiving unit 20 can accurately obtain the actual light intensity and compare it with the theoretical light intensity to effectively determine whether the detection of the gas concentration value is abnormal, thereby improving the stability and accuracy of the analyzer measurement system.

[0042] [Second embodiment] See also Figure 4 In the second embodiment of the present application, a large closed-loop self-test method for photoelectric signals of an analyzer is disclosed, which is applied to the analyzer measurement system described in the first embodiment, and specifically includes the following steps: S10, when the analyzer performs normal measurement of gas concentration, obtaining a first driving current, a maximum current value, and a first scanning waveform of the laser; The first scanning waveform is the output of the laser 11 controlled by the laser 11 driving module 12. Figure 2 The scanning waveform shown in the figure includes: a first lightless section (0-t0), a first stage (t0-t1), and a first scanning section (t1-t2). The first driving current in the first stage is i step , the corresponding constant light intensity output by the laser 11 is I0(t1); in the first scanning section, the driving current of the laser 11 is from i step At the beginning, it gradually increases in a linear ramp manner, and the maximum current value is i scan , the corresponding maximum light intensity output by the laser 11 is I0(t2).

[0043] S20, when the analyzer enters a large closed-loop self-test state, adjusting the first drive current to a second drive current, and acquiring a second scanning waveform based on the maximum current value; Among them, the driving current of the stage is composed of i step Adjust to i test As the second driving current, the maximum current value i of the scanning segment scan The corresponding modulation signal of the laser 11 is changed to Figure 3The scanning waveform shown in orange, that is, the second scanning waveform, includes a second dark segment (0-t0), a second stage (t0-t1), and a second scanning segment (t1-t2).

[0044] It is worth mentioning here that test The value of is: i test = [(i scan -i step ) / n] + i step ; Among them, i scan is the maximum current value, i step is the first driving current, n is the photocurrent self-check factor, and its value is greater than 1. In this embodiment, by configuring the n value, i test Reasonably avoid the influence of light intensity in the gas absorption range. The specific value of n can be pre-set according to the actual situation.

[0045] S30, acquiring theoretical light intensity based on a preset relationship rule between the second driving current and the first scanning waveform; The preset relationship rule is that on the slope straight line in the first scanning 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 is the threshold current of the laser 11, I0(t1) is the constant light intensity output by the laser 11 in the first stage, I ref (t1) is the theoretical light intensity. The corresponding calculation formula for the theoretical light intensity is: I ref (t1) = {1 + (i scan -i step ) / [n*(i step -i th )]}* I0(t1).

[0046] Thus, the setting of step S30 can accurately establish the proportional relationship between the theoretical light intensity on the slope straight line of the first scanning segment and the actual measurement parameter, thereby improving the calculation accuracy of the theoretical light intensity and ensuring that the detection result is accurate and reliable.

[0047] S40, calculating the measured light intensity at the inflection point between the second stage and the second scanning segment based on the second scanning waveform; Among them, corresponding to Figure 3In the figure, the inflection point is set to P, and the measured light intensity of P at time t1 is I test (t1), wherein the measured light intensity can be obtained in the spectral data processing module 24.

[0048] S50: Compare the difference between the measured light intensity and the theoretical light intensity with a preset threshold value to determine whether there is any detection anomaly in the detected gas concentration value.

[0049] Among them, the preset threshold is, for example, 5% of the difference between the two. By comparing the difference with the preset threshold to determine whether there is an abnormality in the gas concentration detection, the reliability of the gas concentration value detection can be effectively improved.

[0050] Furthermore, in this embodiment, the first scanning waveform and the second scanning waveform are obtained by controlling the current of the laser 11 through the driving module 12 at the transmitting end. In this way, the current of the laser 11 can be accurately controlled, ensuring accurate measurement of light intensity, thereby improving the accuracy and reliability of gas concentration detection.

[0051] In addition, it is worth mentioning that in this embodiment, when the large closed-loop self-check state and the state of normal gas concentration measurement are switched back and forth, the corresponding first drive current and the second drive current are switched back and forth. In this way, when the large closed-loop self-check state and the state of normal gas concentration measurement are switched back and forth, it can quickly adapt to the needs of different working modes, ensure the stability and accuracy of the system, and improve the detection efficiency and reliability.

[0052] In summary, the first embodiment of the present invention discloses a large closed-loop self-test method for an analyzer photoelectric signal, which obtains a first driving current, a maximum current value and a first scanning waveform of the laser 11 when the analyzer normally measures the gas concentration, and adjusts to a second driving current and obtains a second scanning waveform after entering the large closed-loop self-test state, thereby effectively solving the technical problem in the background technology that the direct absorption spectroscopy method cannot determine the validity of the signal at the receiving end due to the lack of a high-frequency modulation waveform as a reference signal; the measured light intensity at the inflection point is calculated based on the second scanning waveform and compared with the theoretical light intensity, so as to determine whether there is a detection anomaly in the gas concentration value, thereby avoiding the output of erroneous concentration values ​​caused by invalid signals, and improving the accuracy and reliability of the detection; the self-test function is completed without increasing the hardware complexity and prolonging the system response time, thereby meeting the product performance index requirements, and the back-and-forth switching of the laser 11 current makes the switching between the gas concentration measurement and the self-test state more flexible and efficient.

[0053] [Third embodiment] See also Figure 5In the third embodiment of the present application, an electronic device is disclosed, the device comprising: a memory 61 and a processor 62, the memory 61 is used to store a computer program; the processor 62 is used to implement the steps of the large closed-loop self-test method of the photoelectric signal of the analyzer described in the first embodiment when executing the computer program. For details, please refer to the above, so it will not be described in detail here. The technical effect of the large closed-loop self-test device for the photoelectric signal of the analyzer provided in this embodiment in actual application is the same as the technical effect of the large closed-loop self-test method for the photoelectric signal of the analyzer in the first embodiment.

[0054] [Fourth embodiment] In the fourth embodiment of the present application, a computer-readable storage medium is disclosed. The computer-readable storage medium is, for example, a non-volatile memory, such as: a magnetic medium (such as a hard disk, a floppy disk, and a magnetic tape), an optical medium (such as a CDROM disk and a DVD), a magneto-optical medium (such as an optical disk), and a hardware device specially constructed to store and execute computer-executable instructions (such as a read-only memory (ROM), a random access memory (RAM), a 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 an analyzer photoelectric signal in the aforementioned embodiment.

[0055] In addition, it can be understood that the aforementioned embodiments are only exemplary descriptions of the present invention. Under the premise that the technical features do not conflict, the structures do not contradict, and the purpose of the present invention is not violated, the technical solutions of the various embodiments can be arbitrarily combined and used in combination.

[0056] In the several embodiments provided by the present 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 system described above are only schematic, and the division of modules is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0057] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0058] In addition, each functional unit / module in each embodiment of the present invention may be integrated into one processing unit / module, or each unit / module may exist physically separately, or two or more units / modules may be integrated into one unit / module. The above-mentioned integrated unit / module may be implemented in the form of hardware or in the form of hardware plus software functional units / modules.

[0059] The above-mentioned integrated unit / module implemented in the form of a software functional unit / module can be stored in a computer-readable storage medium. The above-mentioned software functional unit is stored in a storage medium, including a number of instructions for enabling one or more processors of a computer device (which can be a personal computer, a server, or a network device, etc.) to perform some steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (Read-Only Memory, referred to as ROM), random access memory (Random Access Memory, referred to as RAM), disk or optical disk and other media that can store program codes.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A large closed-loop self-test method for photoelectric signals of an analyzer, characterized in that: include: When the analyzer performs normal gas concentration measurement, a first driving current, a maximum current value and a first scanning waveform of the laser are obtained, wherein the first scanning waveform includes: a first lightless section, a first stage and a first scanning section; When the analyzer enters a large closed-loop self-test state, the first drive current is adjusted to a second drive current, and a second scanning waveform is obtained based on the maximum current value, wherein the second scanning waveform includes a second lightless segment, a second stage, and a second scanning segment; Acquire 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; The difference between the measured light intensity and the theoretical light intensity is compared with a preset threshold value to determine whether there is any detection anomaly in the detected gas concentration value.

2. The method according to claim 1, characterized in that The second driving current is determined as follows: i test = [(i scan - i step ) / n] + i step ; Among them, i scan is the maximum current value, i step is the first driving current, n is the photocurrent self-detection factor, and its value is greater than 1.

3. The method according to claim 2, characterized in that The preset relationship rule is that on the slope straight line in the first scanning 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 is the laser threshold current, I0(t1) is the constant light intensity output by the laser in the first stage, I ref (t1) is the theoretical light intensity.

4. The method according to claim 3, characterized in that The calculation formula of the theoretical light intensity is as follows: I ref (t1) = {1 + (i scan - i step ) / [n*(i step - i th )]}* I0(t1).

5. The method according to claim 1, characterized in that The first scanning waveform and the second scanning waveform are obtained by controlling the current of the laser through a driving module at the transmitting end.

6. The method according to claim 1, characterized in that Also includes: When the large closed-loop self-check state and the state of normal gas concentration measurement are switched back and forth, the corresponding first drive current and the second drive current are switched back and forth.

7. An analyzer measurement system, applied to the self-test method according to any one of claims 1 to 6, characterized in that: include: A transmitting unit and a receiving unit, wherein the transmitting unit comprises a laser, a driving module and a collimating lens, and the laser is electrically connected to the driving module; The receiving unit comprises a converging lens and a detector, a data acquisition module, a spectrum data processing module and a signal output module which are electrically connected to each other.

8. The measuring system according to claim 7, characterized in that Also includes: A direct current power supply is used to connect the transmitting unit and the receiving unit respectively.

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

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the large closed-loop self-test method for photoelectric signals of an analyzer are implemented as described in any one of claims 1 to 6.

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