Micro-current calibration device and method for negative air ion observation instrument

Abstract

The invention relates to the field of meteorological measurement, in particular to a micro-current calibration device and method for an air negative ion observation instrument, and the method comprises the steps: obtaining continuous and stable standard micro-current signals with different intensity grades, which are generated by a standard micro-current generation device, and transmitting the standard micro-current signals to the air negative ion observation instrument; receiving and measuring the standard micro-current signal by an air negative ion observation instrument to obtain a standard micro-current measurement signal; fitting the standard micro-current signal and the standard micro-current measurement signal based on a least square method to obtain a calibration equation; according to the calibration equation, the real-time micro-current measurement signal of the air negative ion observation instrument is calibrated to obtain the calibrated micro-current measurement signal of the air negative ion observation instrument, and then according to the sampling volume of the air and the electric quantity of the basic charge, the micro-current measurement signal of the air negative ion observation instrument is obtained. And the calibrated micro-current measurement signal of the air negative ion observation instrument is converted into negative ion concentration, so that calibration of the air negative ion observation instrument is realized.

Description

Technical Field

[0001] The present application relates to the field of meteorological measurement, and in particular to a microcurrent calibration device and method for an air negative ion observation instrument. Background Art

[0002] In the market, the principle of capacitive inhalation method is generally used to measure the content (number concentration) of negative ions in the air. The main working principle of the capacitive inhalation method is: load a quantitative polarization voltage on the polarization plate (or bias plate) of the ion sensor (or collection barrel, collection tube), and then let the measured air pass through the sensor at a set speed. Specific small-particle negative ions in the air are deflected under the action of the electric field and captured by the collection plate to form a current. Based on the collected current, sampling volume, basic charge, etc., the concentration value (number concentration) of negative ions in unit volume of air can be calculated. However, the capacitive inhalation method measures the weak current signal generated by air negative ions. Due to different ways and methods of signal acquisition, signal amplification and signal processing, the negative ion concentrations given by instruments from different manufacturers are not the same, and there are large differences between the measurement results, sometimes even up to 1-2 orders of magnitude.

[0003] Due to the lack of unified standards, there is currently no industry-recognized calibration instrument, so it is impossible to determine whether the negative ion content measured by a certain instrument is accurate, resulting in large differences between measurement results. Summary of the invention

[0004] The purpose of the embodiments of the present application is to provide a micro-current calibration device and method for an air negative ion observation instrument to solve the technical problem of inaccurate measurement of negative ion concentration.

[0005] In order to solve the above technical problems, the present application provides a method for calibrating the microcurrent of an air negative ion observation instrument, and the method comprises the following steps: Obtaining a continuous and stable standard microcurrent signal of different intensity levels generated by a standard microcurrent generating device, wherein the standard microcurrent signal can be traced back to the International Standard Unit System, and the specific intensity level can be set according to demand; The standard microcurrent signal is transmitted to the negative air ion observation instrument, and the negative air ion observation instrument receives and measures the standard microcurrent signal to obtain a standard microcurrent measurement signal; The calibration equation is obtained by fitting the standard microcurrent signal and the standard microcurrent measurement signal based on the least square method; According to the calibration equation, the microcurrent measurement signal of the real-time negative air ion observation instrument is calibrated to obtain the calibrated microcurrent measurement signal of the negative air ion observation instrument, and then according to the sampling volume of the air and the amount of basic charge, the microcurrent measurement signal of the calibrated negative air ion observation instrument is converted into negative ion concentration.

[0006] Preferably, the step of obtaining a standard microcurrent signal of different intensity levels generated by a standard microcurrent generating device, wherein the specific intensity level can be set according to the requirements, includes: Obtaining standard microcurrent signals of at least five different intensity levels generated by a standard microcurrent generating device; The standard microcurrent signal of each level is measured multiple times by using an air negative ion observation instrument to obtain multiple standard microcurrent measurement signals corresponding to each level; The calibration equation is obtained by fitting the standard microcurrent signals of all levels and a plurality of standard microcurrent measurement signals corresponding to each level based on the least square method.

[0007] Preferably, the step of transmitting the standard microcurrent signal to the negative air ion observation instrument, receiving and measuring the standard microcurrent signal by the negative air ion observation instrument and obtaining the standard microcurrent measurement signal comprises: When calibrating an air negative ion observation instrument with multiple sensors based on the microcurrent method, each ion sensor needs to be calibrated separately, wherein the air negative ion observation instrument includes one or more positive ion and / or negative ion sensors to detect the concentration of positive and negative ions in the air respectively; Based on the measurements of each positive ion sensor and each negative ion sensor, a standard microcurrent measurement signal is obtained.

[0008] Preferably, when the multi-sensor air negative ion observation instrument is calibrated based on the microcurrent method, the steps of calibrating each ion sensor separately include: When calibrating each of the multiple ion sensors of the air negative ion observation instrument, the calibration equation corresponding to each ion sensor is obtained by fitting the standard microcurrent signal of each ion sensor and the multiple standard microcurrent measurement signals corresponding to each ion sensor based on the least squares method.

[0009] Preferably, the step of fitting the standard microcurrent signal and the standard microcurrent measurement signal based on the least squares method to obtain a calibration equation comprises: The standard microcurrent signals of different intensity levels are recorded and the standard microcurrent measurement signals are measured by the air negative ion observation instrument. After least square fitting processing, the calibration equation between the standard microcurrent signals of different intensity levels and the standard microcurrent measurement signal is obtained.

[0010] Preferably, the step of recording the standard microcurrent signals of different intensity levels and the standard microcurrent measurement signal measured by the air negative ion observation instrument, and obtaining the calibration equation between the standard microcurrent signals of different intensity levels and the standard microcurrent measurement signal after least squares fitting processing comprises: Record the standard microcurrent signals of different intensity levels and the standard microcurrent measurement signals measured by the air negative ion observation instrument, perform quality control on the standard microcurrent signals of different intensity levels and the standard microcurrent measurement signals, and eliminate obviously abnormal and outlier measurement data; Based on the least squares principle, the calibration equation between the standard microcurrent signals of different intensity levels and the standard microcurrent measurement signals is obtained.

[0011] Preferably, before the step of obtaining a standard microcurrent signal of different intensity levels generated by a standard microcurrent generating device, wherein the specific intensity level can be set according to the requirements, the method further comprises the following steps: Receive control signals, and adjust the remote control switching, time setting, zeroing, switching between measurement mode and calibration mode, etc. of standard microcurrent signals of different intensity levels during the generation process of standard microcurrent signals according to the control signals.

[0012] In order to solve the above technical problems, the present application also provides a micro-current calibration device for an air negative ion observation instrument, the device comprising: A standard microcurrent generating module is used to obtain a continuous and stable standard microcurrent signal of different intensity levels generated by a standard microcurrent generating device. The standard microcurrent signal can be traced back to the international standard unit system, and the specific intensity level can be set according to demand; Microcurrent transmission probe, used to transmit standard microcurrent signal to the air negative ion observation instrument; A fitting calibration algorithm module is used to fit the standard microcurrent signal and the standard microcurrent measurement signal based on the least squares principle and obtain a calibration equation; The signal conversion algorithm module is used to calibrate the microcurrent measurement signal of the real-time air negative ion observation instrument according to the calibration equation to obtain the calibrated microcurrent measurement signal of the air negative ion observation instrument, and then convert the calibrated microcurrent measurement signal of the air negative ion observation instrument into negative ion concentration according to the sampling volume of the air and the amount of basic charge.

[0013] The present application generates a continuous and stable standard microcurrent signal of different intensity levels through a standard microcurrent generating device (the standard microcurrent signal can be traced back to the International System of Standard Units), transmits the standard microcurrent signal to an air negative ion observation instrument, and the air negative ion observation instrument receives and measures the standard microcurrent signal and obtains a standard microcurrent measurement signal; the calibration equation is obtained by fitting the standard microcurrent signal and the standard microcurrent measurement signal based on the least squares method; according to the calibration equation, the microcurrent measurement signal of the real-time air negative ion observation instrument is calibrated to obtain the calibrated microcurrent measurement signal of the air negative ion observation instrument, and then according to the sampling volume of the air and the amount of electricity of the basic charge, the microcurrent measurement signal of the calibrated air negative ion observation instrument is converted into a negative ion concentration, thereby realizing the calibration of the air negative ion observation instrument. The present application provides a unified and traceable calibration method for negative ion observation instruments, thereby improving the accuracy and comparability of observation data, improving work efficiency, and ensuring the accuracy and reliability of observation results. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the scheme in the present application, a brief introduction is given below to the drawings required for use in the description of the embodiments of the present application. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0015] Figure 1 It is a flow chart of an embodiment of a micro-current calibration method of an air negative ion observation instrument; Figure 2 is a schematic diagram of the ion movement trajectory in the ion collector; Figure 3 It is a module diagram of an embodiment of a microcurrent calibration device of an air negative ion observation instrument. DETAILED DESCRIPTION

[0016] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of the present application; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "including" and "having" and any variations thereof in the specification and claims of the present application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of the present application or the above-mentioned drawings are used to distinguish different objects, not to describe a specific order.

[0017] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0018] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings.

[0019] like Figure 1 FIG. 1 is a flowchart of an embodiment of a microcurrent calibration method for an air negative ion observation instrument according to the present application. The microcurrent calibration method for an air negative ion observation instrument comprises:

[0020] Step S110, obtaining a standard microcurrent signal of different intensity levels generated by a standard microcurrent generating device, wherein the standard microcurrent signal can be traced back to the International Standard Unit System, and the specific intensity level can be set according to demand; Step S120, transmitting the standard microcurrent signal to the negative air ion observation instrument, which receives and measures the standard microcurrent signal and obtains a standard microcurrent measurement signal; Step S130, fitting the standard microcurrent signal and the standard microcurrent measurement signal based on the least squares method to obtain a calibration equation; Step S140, according to the calibration equation, calibrate the microcurrent measurement signal of the real-time negative air ion observation instrument to obtain the calibrated microcurrent measurement signal of the negative air ion observation instrument, and then convert the calibrated microcurrent measurement signal of the negative air ion observation instrument into negative ion concentration according to the sampling volume of the air and the amount of basic charge.

[0021] The standard microcurrent generating device is connected to the negative air ion observation instrument to be calibrated through a probe, and the standard microcurrent signals of different intensity levels output by the standard microcurrent generating device are input into the acquisition board of the negative air ion observation instrument to be calibrated, and the standard microcurrent measurement signals are measured by the negative air ion observation instrument to be calibrated; the calculation unit is placed in the standard microcurrent generating device, and receives the standard microcurrent signals of different intensity levels output by the standard microcurrent generating device and the standard microcurrent measurement signals measured by the negative air ion observation instrument to be calibrated, and outputs a correction parameter for the output value of the calibrated negative air ion observation instrument.

[0022] Among them, the standard microcurrent generating device is a microcurrent generating device with different intensity levels that can be measured and traced, that is, it generates standard microcurrents of different intensity levels. At the same time, it can also generate microcurrents of different intensity levels according to the received adjustment signal, and has the functions of remote control switching, time setting, zeroing, switching between measurement mode and calibration mode. Among them, the transmission mode of the adjustment signal can be wired or wireless. When it is a wireless transmission mode, the device also includes an external remote control module, which communicates with the standard microcurrent generating device through the wireless signal module of the external remote control module, so that the external remote control module remotely inputs the operation signal to the standard microcurrent generating device, and the standard microcurrent generating device receives the wireless control signal, adjusts the microcurrent levels of different intensities in the process of generating the standard microcurrent signal according to the wireless control signal, and has remote control switching, time setting, zeroing, switching between measurement and calibration modes.

[0023] In this embodiment, if the standard microcurrent generating device generates a standard microcurrent signal of at least five intensity levels, the standard microcurrent signal of at least five intensity levels generated by the standard microcurrent generating device is obtained by the negative air ion observation instrument, and then the standard microcurrent signal of each level is measured multiple times to obtain multiple standard microcurrent measurement signals corresponding to each level, and then the calibration equation is obtained by fitting all levels of standard microcurrent signals and multiple standard microcurrent measurement signals corresponding to each level based on the least squares method. Among them, the standard microcurrent generating device can generate a standard microcurrent signal of an intensity level of any numerical value, and the specific intensity level can be adjusted according to demand. In the optimal solution of this embodiment, the standard microcurrent generating device optimally generates a standard microcurrent signal of no less than five intensity levels, and the standard microcurrent signal of no less than five intensity levels can maximize the best operation result of the standard microcurrent generating device, avoid overloading the standard microcurrent generating device, and meet the rapid calibration method of this embodiment. Record the standard microcurrent signals of different intensity levels and the standard microcurrent measurement signals measured by the negative air ion observation instrument, and after the least squares fitting process, obtain the calibration equation between the standard microcurrent signals of different intensity levels and the standard microcurrent measurement signals. The standard microcurrent signals of different intensity levels and the standard microcurrent measurement signals measured by the air negative ion observation instrument are recorded, and quality control is performed on the standard microcurrent signals of different intensity levels and the standard microcurrent measurement signals to eliminate the obviously abnormal and outlier measurement data; based on the principle of least squares method, the calibration equation between the standard microcurrent signals of different intensity levels and the standard microcurrent measurement signal is obtained.

[0024] When the negative air ion observation instrument includes multiple ion sensors, the multiple ion sensors receive standard microcurrent signals respectively, and each ion sensor measures the standard microcurrent signal and obtains a standard microcurrent measurement signal. In the present embodiment, when the multi-sensor negative air ion observation instrument is calibrated based on the microcurrent method, each ion sensor needs to be calibrated separately. Among them, the negative air ion observation instrument includes one or more positive ion and / or negative ion sensors, which detect the positive and negative ion concentrations in the air respectively. The multiple ion sensors include any number of positive ion sensors including natural numbers such as two, three, four, five, six, seven, eight, nine, and ten, and may also include any number of negative ion sensors including natural numbers such as two, three, four, five, six, seven, eight, nine, and ten. The number of specific positive ion sensors and negative ion sensors can be designed according to demand. When calibrating each ion sensor of the multiple ion sensors of the air ion observation instrument, the calibration equation corresponding to each ion sensor is obtained by fitting the standard microcurrent signal of each ion sensor and the multiple standard microcurrent measurement signals corresponding to each ion sensor based on the least squares method. For example, when calibrating an air ion observation instrument with three positive ion sensors and three negative ion sensors, the six ion sensors (including three positive ion sensors and three negative ion sensors) should be calibrated separately to obtain calibration equations corresponding to the six ion sensors. According to the calibration equation corresponding to each ion sensor, the measurement signal of each ion sensor is calibrated, and then the measurement signal of each ion sensor after calibration is converted into positive ion concentration or negative ion concentration.

[0025] The calibration equation is obtained by fitting the standard microcurrent signals of different intensity levels and the standard microcurrent measurement signals using the least squares method; after obtaining the microcurrent measurement signal of the real-time negative air ion observation instrument, the microcurrent measurement signal of the real-time negative air ion observation instrument can be calibrated according to the aforementioned calibration equation to obtain the calibrated microcurrent measurement signal of the negative air ion observation instrument, and then according to the sampling volume of the air and the amount of the basic charge, the calibrated microcurrent measurement signal of the real-time negative air ion observation instrument is converted into a negative ion concentration, thereby achieving accurate metrological calibration of the negative air ion observation instrument. Among them, the measurement data of the standard microcurrent signal and the standard microcurrent measurement signal are recorded, and the quality control of the standard microcurrent signal and the standard microcurrent measurement signal is performed to eliminate obviously abnormal or outlier measurement data; based on the least squares method, the optimal measurement data partial derivative equations of the standard microcurrent signal and the standard microcurrent measurement signal are obtained respectively; based on the linear relationship between the optimal measurement data of the standard microcurrent signal and the standard microcurrent measurement signal, the optimal measurement data partial derivative equation of the standard microcurrent signal and the standard microcurrent measurement signal is fitted to obtain the calibration equation. The specific calculation method is as follows:

[0026] When studying the relationship between two variables (x, y), we usually get a series of paired data ( , ),( , )... ( , ); Plot these data in xy. If we find that these points are near a straight line, we can make the equation of this line as (Equation 1-1).

[0027] = + X (Formula 1-1) in: , is any real number To determine and , using the least squares method, the measured value Compared with the value calculated using (Formula 1-1) = + X) - ) 〕Minimum is the "optimization criterion".

[0028] Let: φ = (Formula 1-2) Substituting (Formula 1-1) into (Formula 1-2) we get: φ = (Formula 1-3) when When the minimum, the available function φ , Find the partial derivatives and set them equal to zero. That is:

[0029] + ( ) = (Formula 1-4) ( ) + ( ) = (Formula 1-5) The two obtained , The two equations with unknown variables are solved to obtain: (Formula 1-6) (Formula 1-7) Bundle , Substituting into (Formula 1-1), we can get the fitted linear equation.

[0030] During the fitting process, it is impossible for the fitting equation to pass through all regression data points ( , , , ... , ). Therefore, in order to judge the quality of the fitting equation, the correlation coefficient "R", the statistic "F", and the residual standard deviation "S" can be used for judgment; the closer "R" is to 1, the better; the larger the absolute value of "F", the better; the closer "S" is to 0, the better.

[0031] (Formula 1-8) In (Formula 1-1), m is the sample size, that is, the number of experiments; , The values ​​of X and Y of any set of experiments respectively.

[0032] Preferably, the standard microcurrent generating device has the characteristics of small size, light weight, easy to move, easy to operate, etc., and is not restricted by the detection environment and geographical location.

[0033] In the present embodiment, a movable telescopic probe is also provided, and the probe is connected as a whole with the standard microcurrent generating device, and is used to be connected with the negative air ion observation instrument to be calibrated. The standard microcurrent signal generated by the standard microcurrent generating device is input into the acquisition board of the negative air ion observation instrument through the movable telescopic probe, so as to realize their metrological calibration. Wherein, the negative air ion observation instrument to be calibrated is connected with the probe. The telescopic probe is built with elastic material so that the probe can be telescopically moved or universally moved. Of course, in another embodiment, the telescopic probe can be fixed between the standard microcurrent generating device and the negative air ion observation instrument.

[0034] Preferably, the device further comprises: an external remote control module, which is connected to the standard microcurrent generating device through a wireless signal module of the external remote control module, so that the external remote control module can remotely input an operation signal to the standard microcurrent generating device. For ease of operation, the wireless signal module of the external remote control module is connected to the standard microcurrent generating device through communication to realize functions such as remote switching of standard microcurrent signals of different intensity levels, time setting, zero calibration, and switching between measurement mode and calibration mode.

[0035] Preferably, the measurement process of the standard microcurrent measurement signal by the negative air ion observation instrument includes: transmitting the standard microcurrent signal to the collection board of the negative air ion observation instrument to collect the mobility greater than or equal to the critical ion mobility, and the collection board measures the microcurrent signal to form a standard microcurrent measurement signal.

[0036] In this embodiment, the standard microcurrent generating device generates a continuous and stable standard microcurrent signal of different intensity levels (the standard microcurrent signal can be traced back to the International System of Standard Units), and transmits the standard microcurrent signal to the negative air ion observation instrument, which receives and measures the standard microcurrent signal and obtains the standard microcurrent measurement signal; then the calibration equation is obtained by fitting the standard microcurrent signal and the standard microcurrent measurement signal based on the least squares method; according to the calibration equation, the real-time microcurrent measurement signal of the negative air ion observation instrument is calibrated to obtain the calibrated microcurrent measurement signal of the negative air ion observation instrument, and then according to the sampling volume of the air and the amount of electricity of the basic charge, the calibrated microcurrent measurement signal of the negative air ion observation instrument is converted into the negative ion concentration, thereby realizing the calibration of the negative air ion observation instrument. This application provides a unified and traceable calibration method for the negative ion observation instrument, thereby improving the accuracy and comparability of the observation data, improving the work efficiency, and ensuring the accuracy and reliability of the observation results.

[0037] Further references Figure 3 , as a response to the above Figure 1 The present application provides an embodiment of a microcurrent calibration device for an air negative ion observation instrument. Figure 1 The method embodiments shown correspond.

[0038] like Figure 3 As shown, the microcurrent calibration device of the air negative ion observation instrument described in this embodiment includes: a standard microcurrent generating module 210, a microcurrent delivery probe 220, a fitting calibration algorithm module 230, and a signal conversion algorithm module 240.

[0039] A standard microcurrent generating module 210 is used to obtain a continuous and stable standard microcurrent signal of different intensity levels generated by a standard microcurrent generating device. The standard microcurrent signal can be traced back to the international standard unit system, and the specific intensity level can be set according to the needs; A micro-current delivery probe 220 is used to deliver a standard micro-current signal to an air negative ion observation instrument; A fitting calibration algorithm module 230 is used to fit the standard microcurrent signal and the standard microcurrent measurement signal based on the least square method to obtain a calibration equation; The signal conversion algorithm module 240 is used to calibrate the microcurrent measurement signal of the real-time air negative ion observation instrument according to the calibration equation to obtain a calibrated microcurrent measurement signal of the air negative ion observation instrument, and then convert the calibrated microcurrent measurement signal of the air negative ion observation instrument into a negative ion concentration according to the sampling volume of the air and the amount of basic charge.

[0040] In this embodiment, the standard microcurrent signal of different intensity levels generated by the standard microcurrent generation module 210 (the standard microcurrent signal can be traced back to the international standard unit system) is transmitted by the microcurrent delivery probe 220 to the negative air ion observation instrument, and the negative air ion observation instrument receives and measures the standard microcurrent signal and obtains the standard microcurrent measurement signal; the fitting calibration algorithm module 230 fits the standard microcurrent signal and the standard microcurrent measurement signal based on the least squares method to obtain the calibration equation; the signal conversion algorithm module 240 calibrates the real-time microcurrent measurement signal of the negative air ion observation instrument according to the calibration equation to obtain the calibrated microcurrent measurement signal of the negative air ion observation instrument, and then converts the calibrated microcurrent measurement signal of the negative air ion observation instrument into the negative ion concentration according to the sampling volume of the air and the amount of electricity of the basic charge, thereby realizing the calibration of the negative air ion observation instrument. This application provides a unified and traceable calibration method for the negative ion observation instrument, thereby improving the accuracy and comparability of the observation data, improving the work efficiency, and ensuring the accuracy and reliability of the observation results.

[0041] In some optional implementations of this embodiment, the standard microcurrent generating module 210 includes: A standard microcurrent signal generating device with multiple intensity levels, used to obtain standard microcurrent signals with at least five different intensity levels generated by the standard microcurrent generating device; The measuring module is used to measure the standard microcurrent signal of each level multiple times through the air negative ion observation instrument and obtain multiple standard microcurrent measurement signals corresponding to each level, and to obtain the calibration equation based on the least squares method by fitting the standard microcurrent signals of all levels and the multiple standard microcurrent measurement signals corresponding to each level.

[0042] In some optional implementations of this embodiment, the standard microcurrent generating module 210 includes: When multiple ion sensor modules are used to calibrate an air negative ion observation instrument with multiple sensors based on the microcurrent method, each ion sensor needs to be calibrated separately. The air negative ion observation instrument includes one or more positive ion and / or negative ion sensors to detect the concentration of positive and negative ions in the air respectively.

[0043] In some optional implementations of this embodiment, the plurality of ion sensor modules include: When multiple ion sensor modules are used to calibrate multiple ion sensors of an air negative ion observation instrument, each ion sensor should be calibrated, and the calibration equation corresponding to each ion sensor is obtained by fitting the standard microcurrent signal of each ion sensor and the multiple standard microcurrent measurement signals corresponding to each ion sensor based on the least squares method.

[0044] In some optional implementations of this embodiment, the fitting calibration algorithm module 230 includes: The calibration equation module for fitting standard microcurrent signals of different intensity levels is used to record standard microcurrent signals of different intensity levels and standard microcurrent measurement signals measured by an air negative ion observation instrument. After least squares fitting processing, the calibration equation between standard microcurrent signals of different intensity levels and the standard microcurrent measurement signal is obtained.

[0045] In some optional implementations of this embodiment, the calibration equation module for fitting standard microcurrent signals of different intensity levels includes: The data quality control module is used to record the standard microcurrent signals of different intensity levels and the standard microcurrent measurement signals measured by the air negative ion observation instrument, perform quality control on the standard microcurrent signals of different intensity levels and the standard microcurrent measurement signals, eliminate obviously abnormal and outlier measurement data, and obtain the calibration equation between the standard microcurrent signals of different intensity levels and the standard microcurrent measurement signals based on the principle of least squares method.

[0046] In some optional implementations of this embodiment, the device further includes: The control signal receiving module is used to adjust the remote control switching, time setting, zeroing, and switching between measurement mode and calibration mode of standard microcurrent signals of different intensity levels during the generation process of the standard microcurrent signal according to the control signal.

[0047] Obviously, the embodiments described above are only some embodiments of the present application, rather than all embodiments. The preferred embodiments of the present application are given in the accompanying drawings, but they do not limit the patent scope of the present application. The present application can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present application more thorough and comprehensive. Although the present application is described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned specific implementation methods, or to perform equivalent replacement of some of the technical features therein. Any equivalent structure made using the contents of the specification and drawings of this application, directly or indirectly used in other related technical fields, is similarly within the scope of patent protection of this application.

Claims

1. A microcurrent calibration method for an air negative ion observation instrument, characterized in that: The method comprises the following steps: Obtaining a continuous and stable standard microcurrent signal of different intensity levels generated by a standard microcurrent generating device, wherein the standard microcurrent signal can be traced back to the International Standard Unit System, and the specific intensity level can be set according to demand; The standard microcurrent signal is transmitted to the negative air ion observation instrument, and the negative air ion observation instrument receives and measures the standard microcurrent signal to obtain a standard microcurrent measurement signal; The calibration equation is obtained by fitting the standard microcurrent signal and the standard microcurrent measurement signal based on the least square method; According to the calibration equation, the microcurrent measurement signal of the real-time negative air ion observation instrument is calibrated to obtain the calibrated microcurrent measurement signal of the negative air ion observation instrument, and then according to the sampling volume of the air and the amount of basic charge, the microcurrent measurement signal of the calibrated negative air ion observation instrument is converted into negative ion concentration.

2. The microcurrent calibration method of the air negative ion observation instrument according to claim 1, characterized in that: The step of obtaining a continuous and stable standard microcurrent signal of different intensity levels generated by a standard microcurrent generating device, wherein the specific intensity level can be set according to the requirements, includes: Obtaining standard microcurrent signals of at least five different intensity levels generated by a standard microcurrent generating device; The standard microcurrent signal of each level is measured multiple times by using an air negative ion observation instrument to obtain multiple standard microcurrent measurement signals corresponding to each level; The calibration equation is obtained by fitting the standard microcurrent signals of all levels and a plurality of standard microcurrent measurement signals corresponding to each level based on the least square method.

3. The microcurrent calibration method of the air negative ion observation instrument according to claim 1, characterized in that: The step of transmitting the standard microcurrent signal to the negative air ion observation instrument, and receiving and measuring the standard microcurrent signal by the negative air ion observation instrument to obtain the standard microcurrent measurement signal comprises: When calibrating an air negative ion observation instrument with multiple sensors based on the microcurrent method, each ion sensor needs to be calibrated separately, wherein the air negative ion observation instrument may include one or more positive ion and / or negative ion sensors to detect the positive and negative ion concentrations in the air respectively; Based on the measurements of each positive ion sensor and each negative ion sensor, a standard microcurrent measurement signal is obtained.

4. The microcurrent calibration method of the air negative ion observation instrument according to claim 3, characterized in that: When the multi-sensor air negative ion observation instrument is calibrated based on the microcurrent method, the steps of calibrating each ion sensor separately include: When calibrating each of the multiple ion sensors of the air negative ion observation instrument, the calibration equation corresponding to each ion sensor is obtained by fitting the standard microcurrent signal of each ion sensor and the multiple standard microcurrent measurement signals corresponding to each ion sensor based on the least squares method.

5. The microcurrent calibration method of the air negative ion observation instrument according to claim 2, characterized in that: The step of fitting the standard microcurrent signal and the standard microcurrent measurement signal based on the least squares method to obtain a calibration equation comprises: The standard microcurrent signals of different intensity levels are recorded and the standard microcurrent measurement signals are measured by the air negative ion observation instrument. After least square fitting processing, the calibration equation between the standard microcurrent signals of different intensity levels and the standard microcurrent measurement signal is obtained.

6. The microcurrent calibration method of the air negative ion observation instrument according to claim 5, characterized in that: The steps of recording the standard microcurrent signals of different intensity levels and the standard microcurrent measurement signal obtained by measuring with the air negative ion observation instrument, and obtaining the calibration equation between the standard microcurrent signals of different intensity levels and the standard microcurrent measurement signal after least squares fitting processing include: Record the standard microcurrent signals of different intensity levels and the standard microcurrent measurement signals measured by the air negative ion observation instrument, perform quality control on the standard microcurrent signals of different intensity levels and the standard microcurrent measurement signals, and eliminate obvious outliers and abnormal measurement data; Based on the least squares principle, the calibration equation between the standard microcurrent signals of different intensity levels and the standard microcurrent measurement signals is obtained.

7. The microcurrent calibration method of the air negative ion observation instrument according to claim 1, characterized in that: Before the step of obtaining a continuously stable standard microcurrent signal of different intensity levels generated by a standard microcurrent generating device, wherein the specific intensity level can be set according to the demand, the method further comprises the following steps: Receive control signals, and adjust the remote control switching, time setting, zeroing, switching between measurement mode and calibration mode, etc. of standard microcurrent signals of different intensity levels during the generation process of standard microcurrent signals according to the control signals.

8. A micro-current calibration device for an air negative ion observation instrument, characterized in that: The device comprises: A standard microcurrent generating module is used to obtain a continuous and stable standard microcurrent signal of different intensity levels generated by a standard microcurrent generating device. The standard microcurrent signal can be traced back to the international standard unit system, and the specific intensity level can be set according to demand; Microcurrent transmission probe, used to transmit standard microcurrent signal to the air negative ion observation instrument; A fitting calibration algorithm module is used to fit the standard microcurrent signal and the standard microcurrent measurement signal based on the least squares principle and obtain a calibration equation; The signal conversion algorithm module is used to calibrate the microcurrent measurement signal of the real-time air negative ion observation instrument according to the calibration equation to obtain the calibrated microcurrent measurement signal of the air negative ion observation instrument, and then convert the calibrated microcurrent measurement signal of the air negative ion observation instrument into negative ion concentration according to the sampling volume of the air and the amount of basic charge.

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