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

Abstract

The present application relates to the field of meteorological measurement, and relates to a micro-current calibration device and method for an air negative ion observation instrument. The method comprises the following steps: obtaining a standard micro-current signal of different intensity levels generated by a standard micro-current generating device; delivering the standard micro-current signal to the air negative ion observation instrument; receiving and measuring the standard micro-current signal by the 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 the least square method to obtain a calibration equation; calibrating the real-time micro-current measurement signal of the air negative ion observation instrument according to the calibration equation to obtain a calibrated micro-current measurement signal of the air negative ion observation instrument; and converting the calibrated micro-current measurement signal of the air negative ion observation instrument into a negative ion concentration according to the sampling volume of air and the electric quantity of the elementary charge, so as to realize the calibration of the air negative ion observation instrument.

Description

Technical Field

[0001] This 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 Technology

[0002] In the market, the capacitive suction method is commonly used to measure the concentration of negative ions in the air. The main working principle of the capacitive suction method is as follows: a fixed polarization voltage is applied to the polarization plate (or bias plate) of the ion sensor (or collection tube), and the air being measured is allowed to pass through the sensor at a set speed. Specific small-diameter negative ions in the air are deflected under the influence of the electric field and captured by the collection plate, forming a current. Based on the collected current, sampling volume, and elementary charge, the concentration of negative ions per unit volume of air (number concentration) can be calculated. However, the capacitive suction method measures the weak current signal generated by negative ions in the air. Due to differences in signal acquisition, amplification, and processing methods, instruments from different manufacturers provide varying negative ion concentrations, resulting in significant differences in measurement results, sometimes reaching one to two orders of magnitude.

[0003] Due to the lack of a unified standard, there is currently no universally recognized calibration instrument in the industry. Therefore, it is impossible to determine whether the negative ion content measured by a certain instrument is accurate, resulting in a situation where there are large differences between measurement results. Summary of the Invention

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

[0005] To address the aforementioned technical problems, this application provides a micro-current calibration method for an air negative ion observation instrument, the method comprising the following steps:

[0006] Acquire continuous and stable standard microcurrent signals of different intensity levels generated by a standard microcurrent generator. The standard microcurrent signals are traceable to the International System of Units (SI), and the specific intensity levels can be set according to requirements.

[0007] The standard microcurrent signal is transmitted to the air negative ion observation instrument, which receives and measures the standard microcurrent signal to obtain the standard microcurrent measurement signal.

[0008] The calibration equation is obtained by fitting the standard microcurrent signal and the standard microcurrent measurement signal using the least squares method.

[0009] 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. Then, based on the sampling volume of air and the amount of elementary charge, the calibrated microcurrent measurement signal of the air negative ion observation instrument is converted into negative ion concentration.

[0010] Preferably, the step of acquiring a continuous and stable standard microcurrent signal of different intensity levels generated by a standard microcurrent generator, wherein the specific intensity level can be set according to requirements, includes:

[0011] Acquire standard microcurrent signals of at least five different intensity levels generated by a standard microcurrent generator;

[0012] The standard microcurrent signal of each level was measured multiple times using an air negative ion observation instrument, and multiple standard microcurrent measurement signals corresponding to each level were obtained.

[0013] The calibration equation is obtained by fitting the standard microcurrent signals of all levels and the multiple standard microcurrent measurement signals corresponding to each level using the least squares method.

[0014] Preferably, the step of transmitting the standard microcurrent signal to the air negative ion observation instrument, and having the air negative ion observation instrument receive and measure the standard microcurrent signal to obtain a standard microcurrent measurement signal includes:

[0015] When calibrating 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.

[0016] Standard microcurrent measurement signals are obtained based on measurements from each positive ion sensor and each negative ion sensor.

[0017] Preferably, the step of calibrating each ion sensor separately when calibrating a multi-sensor air negative ion observation instrument based on the micro-current method includes:

[0018] When calibrating each of the multiple ion sensors in an air negative ion observation instrument, the calibration equation for 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 using the least squares method.

[0019] Preferably, the step of obtaining the calibration equation based on fitting the standard microcurrent signal and the standard microcurrent measurement signal using the least squares method includes:

[0020] Standard microcurrent signals of different intensity levels and standard microcurrent measurement signals obtained by air negative ion observation instruments are recorded. After least squares fitting processing, calibration equations between standard microcurrent signals of different intensity levels and standard microcurrent measurement signals are obtained.

[0021] Preferably, the step of recording standard microcurrent signals of different intensity levels and standard microcurrent measurement signals obtained by an air negative ion observation instrument, and obtaining calibration equations between standard microcurrent signals of different intensity levels and standard microcurrent measurement signals after least squares fitting processing includes:

[0022] Record standard microcurrent signals of different intensity levels and standard microcurrent measurement signals obtained by air negative ion observation instruments. Perform quality control on standard microcurrent signals of different intensity levels and standard microcurrent measurement signals, and remove measurement data with obvious abnormalities and outliers.

[0023] Based on the principle of least squares, calibration equations between standard microcurrent signals and standard microcurrent measurement signals of different intensity levels are obtained.

[0024] Preferably, before the step of acquiring a continuous and stable standard microcurrent signal of different intensity levels generated by a standard microcurrent generator, wherein the specific intensity level can be set according to requirements, the method further includes the following steps:

[0025] It receives control signals and adjusts the remote control switching, time setting, zeroing, and switching between measurement and calibration modes for standard microcurrent signals of different intensity levels during the standard microcurrent signal generation process according to the control signals.

[0026] To address the aforementioned technical problems, this application also provides a micro-current calibration device for an air negative ion observation instrument, the device comprising:

[0027] A standard microcurrent generating module is used to acquire continuous and stable standard microcurrent signals of different intensity levels generated by a standard microcurrent generating device. The standard microcurrent signals are traceable to the International System of Units (SI), and the specific intensity level can be set according to requirements.

[0028] A microcurrent transmission probe is used to transmit standard microcurrent signals to an air negative ion observation instrument;

[0029] The fitting calibration algorithm module is used to fit the standard microcurrent signal and the standard microcurrent measurement signal based on the least squares method and obtain the calibration equation.

[0030] 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. Then, based on the sampling volume of air and the amount of elementary charge, the calibrated microcurrent measurement signal of the air negative ion observation instrument is converted into negative ion concentration.

[0031] This application utilizes a standard microcurrent generator to produce continuous and stable standard microcurrent signals of varying intensity levels (traceable to the International System of Units). These signals are then transmitted to an air negative ion monitoring instrument, which receives and measures them to obtain a standard microcurrent measurement signal. A calibration equation is derived by fitting the standard microcurrent signal and the standard microcurrent measurement signal using the least squares method. Based on this equation, the real-time microcurrent measurement signal of the air negative ion monitoring instrument is calibrated to obtain a calibrated signal. Finally, based on the air sampling volume and the amount of elementary charge, the calibrated signal is converted into a negative ion concentration, thus calibrating the instrument. This application provides a unified and traceable calibration method for negative ion monitoring instruments, thereby improving the accuracy and comparability of observation data, increasing work efficiency, and ensuring the accuracy and reliability of observation results. Attached Figure Description

[0032] To more clearly illustrate the solutions in this application, the accompanying drawings used in the description of the embodiments of this application will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a flowchart of an embodiment of the microcurrent calibration method for an air negative ion observation instrument;

[0034] Figure 2 This is a schematic diagram of the ion movement trajectory inside the ion collector;

[0035] Figure 3 This is a block diagram of one embodiment of the microcurrent calibration device for an air negative ion observation instrument. Detailed Implementation

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein in the specification of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and foregoing drawings of this application, are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or foregoing drawings of this application are used to distinguish different objects, not to describe a particular order.

[0037] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0038] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.

[0039] like Figure 1 The diagram shows a flowchart of an embodiment of the micro-current calibration method for an air negative ion observation instrument according to this application. The micro-current calibration method for the air negative ion observation instrument includes:

[0040] Step S110: Obtain a continuous and stable standard microcurrent signal of different intensity levels generated by a standard microcurrent generator. The standard microcurrent signal can be traced back to the International System of Units (SI), and the specific intensity level can be set according to requirements.

[0041] Step S120: The standard microcurrent signal is transmitted to the air negative ion observation instrument, which receives and measures the standard microcurrent signal and obtains the standard microcurrent measurement signal.

[0042] Step S130: The calibration equation is obtained by fitting the standard microcurrent signal and the standard microcurrent measurement signal using the least squares method.

[0043] Step S140: 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. Then, according to the sampling volume of air and the amount of elementary charge, the calibrated microcurrent measurement signal of the air negative ion observation instrument is converted into negative ion concentration.

[0044] The standard microcurrent generator is connected to the air negative ion observation instrument to be calibrated via a probe. The standard microcurrent signals of different intensity levels output by the standard microcurrent generator are input into the acquisition board of the air negative ion observation instrument to be calibrated, and the air negative ion observation instrument to be calibrated measures the standard microcurrent measurement signal. The calculation unit is placed inside the standard microcurrent generator and receives the standard microcurrent signals of different intensity levels output by the standard microcurrent generator and the standard microcurrent measurement signal measured by the air negative ion observation instrument to be calibrated, and outputs a correction parameter for the output value of the calibrated air negative ion observation instrument.

[0045] The standard microcurrent generator is a measurable and traceable microcurrent generator with different intensity levels, capable of producing standard microcurrents of varying intensity. It can also generate different intensity microcurrent levels based on received adjustment signals and features remote control switching, time setting, zeroing, and switching between measurement and calibration modes. The adjustment signal can be transmitted wired or wirelessly. When wireless, the device includes an external remote control module that communicates with the standard microcurrent generator via its wireless signal module. This allows the external remote control module to remotely input operation signals to the standard microcurrent generator. The standard microcurrent generator receives the wireless control signal and adjusts the intensity microcurrent levels during standard microcurrent signal generation accordingly, and also features remote control switching, time setting, zeroing, and switching between measurement and calibration modes.

[0046] In this embodiment, if the standard microcurrent generator produces at least five intensity levels of standard microcurrent signals, the air negative ion monitoring instrument acquires these signals. Multiple measurements are then performed on each intensity level to obtain multiple standard microcurrent measurement signals corresponding to each level. A calibration equation is then obtained by fitting all intensity levels of the standard microcurrent signals and the multiple standard microcurrent measurement signals corresponding to each level using the least squares method. The standard microcurrent generator can produce standard microcurrent signals of any intensity level, and the specific intensity level can be adjusted according to requirements. In this embodiment, the optimal solution is for the standard microcurrent generator to produce at least five intensity levels of standard microcurrent signals. This maximizes the optimal operating results of the standard microcurrent generator, avoids overloading the device, and satisfies the rapid calibration method of this embodiment. Recording the standard microcurrent signals of different intensity levels and the standard microcurrent measurement signals obtained by the air negative ion monitoring instrument, and then performing least squares fitting processing, yields the calibration equation between the standard microcurrent signals of different intensity levels and the standard microcurrent measurement signals. Standard microcurrent signals of different intensity levels and standard microcurrent measurement signals obtained by air negative ion observation instruments are recorded. Quality control is performed on the standard microcurrent signals and standard microcurrent measurement signals of different intensity levels to remove obviously abnormal and outlier measurement data. Based on the principle of least squares, calibration equations between standard microcurrent signals and standard microcurrent measurement signals of different intensity levels are obtained.

[0047] When an air negative ion monitoring instrument includes multiple ion sensors, each ion sensor receives a standard microcurrent signal. Each ion sensor measures the standard microcurrent signal to obtain a standard microcurrent measurement signal. In this embodiment, when calibrating the multi-sensor air negative ion monitoring instrument based on the microcurrent method, each ion sensor needs to be calibrated separately. The air negative ion monitoring instrument includes one or more positive and / or negative ion sensors to detect the concentrations of positive and negative ions in the air. The multiple ion sensors can include any number of positive ion sensors (two, three, four, five, six, seven, eight, nine, ten, etc.) and any number of negative ion sensors (two, three, four, five, six, seven, eight, nine, ten, etc.), and the specific number of positive and negative ion sensors can be designed according to requirements. When calibrating each ion sensor of the multiple ion sensors in the air ion monitoring instrument, the calibration equation for 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 using the least squares method. For example, when calibrating an air ion observation instrument with three positive ion sensors and three negative ion sensors, each of the six ion sensors (including the three positive ion sensors and the three negative ion sensors) should be calibrated separately to obtain the calibration equations corresponding to the six ion sensors. Based on the calibration equations corresponding to each ion sensor, the measurement signal of each ion sensor is calibrated, and then the calibrated measurement signal of each ion sensor is converted into positive ion concentration or negative ion concentration.

[0048] A calibration equation is obtained by fitting standard microcurrent signals and standard microcurrent measurement signals of different intensity levels using the least squares method. After obtaining the real-time microcurrent measurement signal of the air negative ion observation instrument, the microcurrent measurement signal can be calibrated according to the aforementioned calibration equation to obtain the calibrated microcurrent measurement signal. Then, based on the air sampling volume and the amount of elementary charge, the calibrated real-time microcurrent measurement signal is converted into negative ion concentration, thereby achieving accurate metrological calibration of the air negative ion observation instrument. Specifically, the measurement data of the standard microcurrent signal and standard microcurrent measurement signal are recorded, and quality control is performed on the standard microcurrent signal and standard microcurrent measurement signal to remove obviously abnormal or outlier measurement data. Based on the least squares method, the partial derivative equations of the optimal measurement data of the standard microcurrent signal and standard microcurrent measurement signal are obtained respectively. Based on the linear relationship of the optimal measurement data of the standard microcurrent signal and standard microcurrent measurement signal, the partial derivative equations of the optimal measurement data of the standard microcurrent signal and standard microcurrent measurement signal are fitted to obtain the calibration equation. The specific calculation method is as follows:

[0049] When studying the relationship between two variables (x, y), a series of paired data can usually be obtained. , ),( , ).. ( , Plot these data in xy. If we find that these points are near a straight line, we can set the equation of this line as shown in (Equation 1-1).

[0050] = + X (Equation 1-1)

[0051] in: , It is any real number

[0052] To determine and Applying the least squares method, the measured values The value calculated using (Equation 1-1) = + The difference of X) - The sum of squares of ) The minimum value is the "optimization criterion".

[0053] Let: φ = (Equation 1-2)

[0054] Substituting (Equation 1-1) into (Equation 1-2) yields:

[0055] φ = (Equation 1-3)

[0056] when When it is at its minimum, the function φ can be used to... , Find the partial derivatives and set both partial derivatives equal to zero. That is:

[0057] + ( ) = (Equation 1-4)

[0058] ( ) + ( ) = (Equation 1-5)

[0059] The two obtained about , Solving the two systems of equations with unknowns yields the following results:

[0060] (Equation 1-6)

[0061] (Equation 1-7)

[0062] Bundle , Substituting into (Equation 1-1), we can obtain the fitted linear equation.

[0063] like Figure 2 As shown, during the fitting process, it is impossible for the fitted equation to pass through every single regression data point. , , , ... , Therefore, to judge the goodness of fit of the equation, the correlation coefficient "R", the statistic "F", and the residual standard deviation "S" can be used; 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.

[0064] (Equation 1-8)

[0065] In (Equation 1-1), m is the sample size, i.e., the number of experiments; , The values ​​of X and Y for any given set of experiments.

[0066] Preferably, the standard microcurrent generator is small in size, light in weight, easy to move and easy to operate, and is not limited by the detection environment or geographical location.

[0067] In this embodiment, a movable telescopic probe is also provided. The probe is integrated with a standard microcurrent generator and is used to connect to the air negative ion observation instrument to be calibrated. The standard microcurrent signal generated by the standard microcurrent generator is input to the acquisition board of the air negative ion observation instrument through the movable telescopic probe to achieve metrological calibration. The connection between the air negative ion observation instrument to be calibrated and the probe is described. The telescopic probe has a built-in elastic material to allow it to extend, retract, or move in all directions. Alternatively, in another embodiment, the telescopic probe can be fixed between the standard microcurrent generator and the air negative ion observation instrument.

[0068] Preferably, the device further includes an external remote control module, which communicates with the standard microcurrent generator via its wireless signal module, allowing the external remote control module to remotely input operation signals to the standard microcurrent generator. For ease of operation, the communication connection between the external remote control module and the standard microcurrent generator enables remote switching of standard microcurrent signals of different intensity levels, time setting, zero calibration, and switching between measurement and calibration modes.

[0069] Preferably, the measurement process of the standard microcurrent measurement signal by the air negative ion observation instrument includes: transmitting the standard microcurrent signal to the acquisition plate of the air negative ion observation instrument to acquire ions with a mobility greater than or equal to the critical ion mobility; the acquisition plate measuring the microcurrent signal to form a standard microcurrent measurement signal.

[0070] In this embodiment, a standard microcurrent generator produces continuous and stable standard microcurrent signals of different intensity levels (the standard microcurrent signals are traceable to the International System of Units). These standard microcurrent signals are transmitted to an air negative ion observation instrument, which receives and measures them to obtain a standard microcurrent measurement signal. A calibration equation is then derived by fitting the standard microcurrent signal and the standard microcurrent measurement signal using the least squares method. Based on this calibration equation, the real-time microcurrent measurement signal of the air negative ion observation instrument is calibrated to obtain a calibrated microcurrent measurement signal. Finally, based on the air sampling volume and the amount of elementary charge, the calibrated microcurrent measurement signal is converted into a negative ion concentration, thus calibrating the air negative ion observation instrument. This application provides a unified and traceable calibration method for negative ion observation instruments, thereby improving the accuracy and comparability of observation data, increasing work efficiency, and ensuring the accuracy and reliability of observation results.

[0071] Further reference Figure 3 As a response to the above Figure 1 The implementation of the method shown in this application provides an embodiment of a micro-current calibration device for an air negative ion observation instrument. This embodiment of the method is similar to... Figure 1 The method embodiments shown correspond to those described.

[0072] like Figure 3 As shown, the microcurrent calibration device of the air negative ion observation instrument described in this embodiment includes: a standard microcurrent generation module 210, a microcurrent delivery probe 220, a fitting calibration algorithm module 230, and a signal conversion algorithm module 240.

[0073] The standard microcurrent generating module 210 is used to acquire continuous and stable standard microcurrent signals of different intensity levels generated by the standard microcurrent generating device. The standard microcurrent signals are traceable to the International System of Units (SI), and the specific intensity level can be set according to requirements.

[0074] The microcurrent transmission probe 220 is used to transmit a standard microcurrent signal to an air negative ion observation instrument;

[0075] The fitting calibration algorithm module 230 is used to obtain the calibration equation by fitting the standard microcurrent signal and the standard microcurrent measurement signal based on the least squares method.

[0076] 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 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 air and the amount of elementary charge.

[0077] In this embodiment, a continuous and stable standard microcurrent signal of different intensity levels (traceable to the International System of Units) is generated by the standard microcurrent generation module 210. The microcurrent transmission probe 220 transmits this standard microcurrent signal to the air negative ion observation instrument, which receives and measures it to obtain a standard microcurrent measurement signal. The fitting calibration algorithm module 230 uses the least squares method to fit the standard microcurrent signal and the standard microcurrent measurement signal to obtain a calibration equation. The signal conversion algorithm module 240 calibrates the real-time microcurrent measurement signal of the air negative ion observation instrument according to the calibration equation, obtaining a calibrated microcurrent measurement signal. Then, based on the air sampling volume and the amount of elementary charge, the calibrated microcurrent measurement signal is converted into a negative ion concentration, thus calibrating the air negative ion observation instrument. This application provides a unified and traceable calibration method for negative ion observation instruments, thereby improving the accuracy and comparability of observation data, increasing work efficiency, and ensuring the accuracy and reliability of observation results.

[0078] In some optional implementations of this embodiment, the standard microcurrent generating module 210 includes:

[0079] A standard microcurrent signal generator with multiple intensity levels is used to acquire at least five standard microcurrent signals of different intensity levels generated by the standard microcurrent generator.

[0080] The measurement module is used to perform multiple measurements of the standard microcurrent signal at each level using an air negative ion observation instrument, and obtain multiple standard microcurrent measurement signals corresponding to each level. The calibration equation is obtained by fitting the standard microcurrent signals at all levels and the multiple standard microcurrent measurement signals corresponding to each level based on the least squares method.

[0081] In some optional implementations of this embodiment, the standard microcurrent generating module 210 includes:

[0082] Multiple ion sensor modules are used to calibrate an air negative ion monitoring instrument with multiple sensors based on the microcurrent method. Each ion sensor needs to be calibrated separately. The air negative ion monitoring instrument includes one or more positive and / or negative ion sensors to detect the concentrations of positive and negative ions in the air.

[0083] In some optional implementations of this embodiment, the plurality of ion sensor modules include:

[0084] Multiple ion sensor modules are used to calibrate multiple ion sensors in an air negative ion observation instrument. Each ion sensor should be calibrated. The calibration equation for 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.

[0085] In some optional implementations of this embodiment, the fitting calibration algorithm module 230 includes:

[0086] 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 obtained by air negative ion observation instruments. After least squares fitting processing, the calibration equation between standard microcurrent signals of different intensity levels and standard microcurrent measurement signals is obtained.

[0087] In some optional implementations of this embodiment, the calibration equation module for fitting standard microcurrent signals of different intensity levels includes:

[0088] The data quality control module is used to record standard microcurrent signals of different intensity levels and standard microcurrent measurement signals obtained by air negative ion observation instruments. It performs quality control on standard microcurrent signals and standard microcurrent measurement signals of different intensity levels, removes obvious abnormal and outlier measurement data, and obtains calibration equations between standard microcurrent signals and standard microcurrent measurement signals of different intensity levels based on the least squares method.

[0089] In some optional implementations of this embodiment, the apparatus further includes:

[0090] The receiving control signal module is used to adjust the remote control switching, time setting, zeroing, and switching between measurement mode and calibration mode of the standard microcurrent signal with different intensity levels during the standard microcurrent signal generation process according to the control signal.

[0091] Obviously, the embodiments described above are only some embodiments of this application, not all embodiments. The accompanying drawings show preferred embodiments of this application, but do not limit the patent scope of this application. This application can be implemented in many different forms; rather, the purpose of providing these embodiments is to provide a more thorough and comprehensive understanding of the disclosure of this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments, or make equivalent substitutions for some of the technical features. Any equivalent structures made using the content of this application's specification and drawings, directly or indirectly applied to other related technical fields, are similarly within the scope of patent protection of this application.

Claims

1. A micro-current calibration method for an air negative ion observation instrument, characterized in that, The method includes the following steps: It receives control signals and adjusts the remote control switching, time setting, zeroing, and switching between measurement and calibration modes for standard microcurrent signals of different intensity levels during the standard microcurrent signal generation process according to the control signals; Acquire continuous and stable standard microcurrent signals of different intensity levels generated by a standard microcurrent generator. The standard microcurrent signals are traceable to the International System of Units (SI), and the specific intensity levels can be set according to requirements. The standard microcurrent signal is transmitted to the air negative ion observation instrument, which receives and measures the standard microcurrent signal to obtain the standard microcurrent measurement signal. The calibration equation is obtained by fitting the standard microcurrent signal and the standard microcurrent measurement signal using 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. Then, based on the air sampling volume and the amount of elementary charge, the calibrated microcurrent measurement signal of the air negative ion observation instrument is converted into negative ion concentration. The step of acquiring a continuous and stable standard microcurrent signal of different intensity levels generated by a standard microcurrent generator, wherein the specific intensity level can be set according to requirements, includes: Acquire standard microcurrent signals of at least five different intensity levels generated by a standard microcurrent generator; The standard microcurrent signal of each level was measured multiple times using an air negative ion observation instrument, and multiple standard microcurrent measurement signals corresponding to each level were obtained. The calibration equation is obtained by fitting the standard microcurrent signals of all levels and the multiple standard microcurrent measurement signals corresponding to each level using the least squares method. The step of transmitting the standard microcurrent signal to the air negative ion observation instrument, and having the air negative ion observation instrument receive and measure the standard microcurrent signal to obtain the standard microcurrent measurement signal includes: When calibrating 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 may include 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; The step of obtaining the calibration equation by fitting the standard microcurrent signal and the standard microcurrent measurement signal using the least squares method includes: Standard microcurrent signals of different intensity levels and standard microcurrent measurement signals obtained by air negative ion observation instruments are recorded. After least squares fitting processing, calibration equations between standard microcurrent signals of different intensity levels and standard microcurrent measurement signals are obtained.

2. The micro-current calibration method for the air negative ion observation instrument according to claim 1, characterized in that, When calibrating a multi-sensor air negative ion observation instrument based on the micro-current method, the steps required to calibrate each ion sensor separately include: When calibrating each of the multiple ion sensors in an air negative ion observation instrument, the calibration equation for 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 using the least squares method.

3. The micro-current calibration method for the air negative ion observation instrument according to claim 1, characterized in that, The steps for obtaining the calibration equation between the standard microcurrent signals of different intensity levels and the standard microcurrent measurement signals obtained by the air negative ion observation instrument after least squares fitting processing include: Record standard microcurrent signals of different intensity levels and standard microcurrent measurement signals obtained by air negative ion observation instruments. Perform quality control on standard microcurrent signals of different intensity levels and standard microcurrent measurement signals, and remove obvious outliers and abnormal measurement data. Based on the principle of least squares, calibration equations between standard microcurrent signals and standard microcurrent measurement signals of different intensity levels are obtained.

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