Humidity calibration method and device, constant temperature and humidity chamber and storage medium

Abstract

The invention relates to the technical field of calibration, and particularly provides a humidity calibration method and device, a constant temperature and humidity chamber and a storage medium. The method aims at solving the problem that a large error still exists between the relative humidity calibrated through an existing method and the actually-measured humidity. Therefore, the humidity calibration method is applied to the constant-temperature and constant-humidity chamber and specifically comprises the steps that the temperature of a sampling point of the constant-temperature and constant-humidity chamber is obtained; calibrating the central point temperature of the constant temperature and humidity chamber based on the sampling point temperature; determining the absolute humidity of the sampling point based on the temperature of the sampling point; and calibrating the relative humidity of the central point of the constant temperature and humidity chamber based on the calibrated temperature of the central point and the absolute humidity of the sampling point. The temperature of the central point of the constant temperature and humidity chamber is calibrated based on the temperature of the sampling point, and the relative humidity of the central point is adaptively calibrated based on the calibrated temperature of the central point and the absolute humidity of the sampling point, so that the temperature and humidity precision of the constant temperature and humidity chamber is remarkably improved, and the use effect of the constant temperature and humidity chamber is guaranteed.

Description

Technical Field

[0001] The present application relates to the field of calibration technology, and in particular to a humidity calibration method, device, constant temperature and humidity chamber, and storage medium. Background Art

[0002] In a constant temperature and humidity chamber, the temperature and humidity sensor is generally installed behind the air duct plate at the rear of the chamber. Due to the different volumes of the chamber, the distance between the center point (point a) in the chamber and the position of the temperature and humidity sensor probe (point b) is generally 30 to 50 cm. In actual use, it is found that after the relative humidity collected by the temperature and humidity sensor (point b) is calibrated, there is still a large gap between the actual measured humidity at the center point of the chamber (point a). The reason is that the relative humidity is greatly affected by temperature. Even if the absolute humidity of the two preset measurement points is the same but the temperature is different, their relative humidity is different. For example, when the set target temperature value is close to the ambient temperature, the temperature difference between the center point of the chamber (point a) and the position of the temperature and humidity sensor probe (point b) is small, and there will be no large error between the relative humidity collected at point b and the actual measured humidity at point a after calibration. When the set target temperature value is high, the temperature difference between the center point of the chamber (point a) and the position of the temperature and humidity sensor probe (point b) is large. If the relative humidity at point b is calibrated by the existing calibration method, there is still a large error with the actual measured humidity at point a.

[0003] Accordingly, a new humidity calibration solution is needed in the art to solve the above problems. Summary of the invention

[0004] In order to overcome the above-mentioned defects, the present application is proposed to solve or at least partially solve the technical problem that there is still a large error between the relative humidity after calibration by the existing method and the actual measured humidity.

[0005] In a first aspect, a humidity calibration method is provided, which is applied to a constant temperature and humidity chamber, the method comprising: obtaining a sampling point temperature of the constant temperature and humidity chamber; calibrating a center point temperature of the constant temperature and humidity chamber based on the sampling point temperature; determining the absolute humidity of the sampling point based on the sampling point temperature; and calibrating the center point relative humidity of the constant temperature and humidity chamber based on the calibrated center point temperature and the sampling point absolute humidity.

[0006] In a technical solution of the above-mentioned humidity calibration method, the center point temperature of the constant temperature and humidity chamber is calibrated based on the sampling point temperature, including: based on the sampling point temperature and a preset corresponding relationship, obtaining the temperature difference value corresponding to the sampling point temperature, and the preset corresponding relationship includes the corresponding relationship between the sampling point temperature and the temperature difference value between the sampling point temperature and the center point temperature; based on the sampling point temperature and the temperature difference value corresponding to the sampling point temperature, determining the calibrated center point temperature.

[0007] In a technical solution of the above-mentioned humidity calibration method, the preset corresponding relationship is determined based on the following steps: obtaining a plurality of sampling point measurement temperatures of different temperature values ​​and the corresponding center point measurement temperatures; determining the temperature difference between the sampling point measurement temperature of each temperature value and the corresponding center point measurement temperature based on the plurality of sampling point measurement temperatures of different temperature values ​​and the corresponding center point measurement temperatures; establishing a preset corresponding relationship between the sampling point temperature and the temperature difference between the sampling point temperature and the center point temperature based on each of the sampling point measurement temperatures and the temperature difference between the sampling point measurement temperature and the corresponding center point measurement temperature.

[0008] In a technical solution of the above-mentioned humidity calibration method, determining the absolute humidity of the sampling point based on the temperature of the sampling point includes: obtaining the actual vapor pressure of the sampling point, the volume value of the air in the constant temperature and humidity chamber, a preset ideal gas constant and a preset molar mass; determining the absolute humidity of the sampling point based on the temperature of the sampling point, the actual vapor pressure of the sampling point, the volume value, the preset ideal gas constant and the preset molar mass.

[0009] In a technical solution of the above humidity calibration method, obtaining the actual vapor pressure at the sampling point includes: obtaining the relative humidity and saturated vapor pressure at the sampling point; and obtaining the actual vapor pressure at the sampling point based on the relative humidity and saturated vapor pressure at the sampling point.

[0010] In a technical solution of the above-mentioned humidity calibration method, the absolute humidity at the sampling point is determined based on the temperature at the sampling point, the actual vapor pressure at the sampling point, the volume value, the preset ideal gas constant and the preset molar mass, including: determining the water vapor mass based on the temperature at the sampling point, the actual vapor pressure at the sampling point, the volume value, the preset ideal gas constant and the preset molar mass; determining the absolute humidity at the sampling point based on the water vapor mass and the volume value.

[0011] In a technical solution of the above-mentioned humidity calibration method, the center point relative humidity of the constant temperature and humidity chamber is calibrated based on the calibrated center point temperature and the absolute humidity of the sampling point, including: when the absolute humidity of the center point is equal to the absolute humidity of the sampling point, the center point saturated vapor pressure is obtained; based on the center point temperature, the center point saturated vapor pressure, the volume value, the preset ideal gas constant, the preset molar mass and the absolute humidity of the sampling point, the calibrated center point relative humidity is determined.

[0012] In a second aspect, a humidity calibration device is provided, which is applied to a constant temperature and humidity chamber, and the device includes: an acquisition module, which is used to acquire the sampling point temperature of the constant temperature and humidity chamber; a temperature calibration module, which is used to calibrate the center point temperature of the constant temperature and humidity chamber based on the sampling point temperature; an absolute humidity determination module, which is used to determine the absolute humidity of the sampling point based on the sampling point temperature; and a relative humidity calibration module, which is used to calibrate the center point relative humidity of the constant temperature and humidity chamber based on the calibrated center point temperature and the sampling point absolute humidity.

[0013] In a third aspect, a constant temperature and humidity chamber is provided, which includes a humidity calibration device, a sensor, at least one processor; and a memory communicatively connected to the at least one processor; wherein a computer program is stored in the memory, and when the computer program is executed by the at least one processor, the method described in any one of the technical solutions of the above-mentioned humidity calibration method is implemented.

[0014] In a fourth aspect, a computer-readable storage medium is provided, wherein a plurality of program codes are stored in the computer-readable storage medium, wherein the program codes are suitable for being loaded and run by a processor to execute the method described in any one of the technical solutions of the above-mentioned humidity calibration method.

[0015] The above one or more technical solutions of the present application have at least one or more of the following beneficial effects:

[0016] The present application provides a humidity calibration method, which is applied to a constant temperature and humidity chamber, and specifically includes: obtaining the sampling point temperature of the constant temperature and humidity chamber; calibrating the center point temperature of the constant temperature and humidity chamber based on the sampling point temperature; determining the absolute humidity of the sampling point based on the sampling point temperature; and calibrating the center point relative humidity of the constant temperature and humidity chamber based on the calibrated center point temperature and the absolute humidity of the sampling point. The present application calibrates the center point temperature of the constant temperature and humidity chamber based on the sampling point temperature, and adaptively calibrates the center point relative humidity based on the calibrated center point temperature and the absolute humidity of the sampling point, thereby improving the temperature and humidity measurement accuracy of the constant temperature and humidity chamber and ensuring the use effect of the constant temperature and humidity chamber. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The disclosure of the present application will become easier to understand with reference to the accompanying drawings. It is easy for those skilled in the art to understand that these drawings are only for illustrative purposes and are not intended to limit the scope of protection of the present application. Among them:

[0018] Figure 1 is a schematic flow chart of the main steps of a humidity calibration method according to an embodiment of the present application;

[0019] Figure 2 is a schematic diagram of the positions of sampling points and center points according to an embodiment of the present application;

[0020] Figure 3 is a scatter diagram of the measured temperatures at the sampling points and the corresponding temperature difference values ​​according to an embodiment of the present application;

[0021] Figure 4 is a schematic diagram of the main structure of a humidity calibration device according to an embodiment of the present application;

[0022] Figure 5 It is a schematic diagram of the main structure of a constant temperature and humidity chamber according to an embodiment of the present application. Reference numerals:

[0023] 41: acquisition module; 42: temperature calibration module; 43: absolute humidity determination module; 44: relative humidity calibration module; 51: humidity calibration device; 52: sensor; 53: processor; 54: memory. DETAILED DESCRIPTION

[0024] Some embodiments of the present application are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present application and are not intended to limit the protection scope of the present application.

[0025] In the description of the present application, "module" and "processor" may include hardware, software or a combination of the two. A module may include hardware circuits, various suitable sensors, communication ports, memory, and may also include software parts, such as program code, or a combination of software and hardware. The processor may be a central processing unit, a microprocessor, an image processor, a digital signal processor or any other suitable processor. The processor has data and / or signal processing functions. The processor may be implemented in software, hardware or a combination of the two. Computer-readable storage media include any suitable medium that can store program code, such as a disk, a hard disk, an optical disk, a flash memory, a read-only memory, a random access memory, etc. The term "A and / or B" means all possible combinations of A and B, such as only A, only B or A and B. The term "at least one A or B" or "at least one of A and B" has a similar meaning to "A and / or B" and may include only A, only B or A and B. The singular terms "one" and "the" may also include plural forms.

[0026] Here we first explain some terms involved in this application.

[0027] Absolute humidity: The actual value of the weight of water vapor contained in a unit volume of moist air.

[0028] Saturated humidity: the maximum value of water vapor that can be contained in a unit volume of air under certain air pressure and temperature conditions.

[0029] Relative humidity: The ratio of the absolute humidity of wet air to the saturated humidity that can be reached at the same temperature. Relative humidity = absolute humidity / saturated humidity × 100%. The humidity displayed by the humidity sensor sampling value is the relative humidity.

[0030] Saturated vapor pressure: the partial pressure of water vapor when water vapor and liquid water are in dynamic equilibrium at a specific temperature. The saturated vapor pressure increases with increasing temperature.

[0031] Actual Vapor Pressure: The partial pressure of water vapor actually present in the air at a given temperature and relative humidity.

[0032] In the actual use of the constant temperature and humidity chamber, it is found that after the relative humidity collected at the temperature and humidity sensor probe position (point b) is calibrated, there is still a large gap with the actual measured humidity at the center of the chamber (point a). The existing calibration method generally uses the calibration value to calibrate the relative humidity collected by the temperature and humidity sensor to estimate the relative humidity at the center of the chamber. For example, the chamber temperature is set to 37 degrees Celsius, the humidity is set to 75%, and the relative humidity sampled at the temperature and humidity sensor probe position (point b) after the temperature stabilizes is 75%. The actual measured humidity at the center of the chamber (point a) is 72.5%, the calibration value is -2.5%, and the relative humidity after calibration is 72.5% (sampled relative humidity + calibration value). If the chamber temperature is changed at this time, such as to 57 degrees Celsius, after the temperature stabilizes, the error between the actual measured humidity at the center of the chamber (point a) and the relative humidity sampled at the temperature and humidity sensor probe position (point b) will be large. The reason is that the relative humidity is greatly affected by temperature. When the set target temperature value is high, the temperature difference between points a and b is large. If the relative humidity calibrated by the existing humidity calibration method is relied on, there will still be a large error with the actual measured humidity.

[0033] To this end, the present application provides a humidity calibration method, which is applied to a constant temperature and humidity chamber, specifically including: obtaining the sampling point temperature of the constant temperature and humidity chamber; calibrating the center point temperature of the constant temperature and humidity chamber based on the sampling point temperature; determining the absolute humidity of the sampling point based on the sampling point temperature; and calibrating the center point relative humidity of the constant temperature and humidity chamber based on the calibrated center point temperature and the absolute humidity of the sampling point. The present application calibrates the center point temperature of the constant temperature and humidity chamber based on the sampling point temperature, and adaptively calibrates the center point relative humidity based on the calibrated center point temperature and the absolute humidity of the sampling point, thereby improving the temperature and humidity measurement accuracy of the constant temperature and humidity chamber and ensuring the use effect of the constant temperature and humidity chamber.

[0034] See attached Figure 1 , Figure 1 FIG. 1 is a flow chart of the main steps of a humidity calibration method according to an embodiment of the present application. Figure 1As shown, the humidity calibration method in the embodiment of the present application is applied to a constant temperature and humidity chamber, and mainly includes the following steps S101 to S104.

[0035] Step S101: obtaining the temperature of the sampling point of the constant temperature and humidity chamber.

[0036] In this embodiment, the temperature at the sampling point is collected by a temperature and humidity sensor installed in the constant temperature and humidity chamber, and the sampling point may be the probe position of the temperature and humidity sensor of the constant temperature and humidity chamber.

[0037] Step S102: calibrating the center point temperature of the constant temperature and humidity chamber based on the sampling point temperature.

[0038] In this embodiment, the center point is the center position of the constant temperature and humidity chamber. The temperature and humidity displayed by the constant temperature and humidity chamber are usually regarded as representing the temperature and humidity information at its center position. However, since there is a certain distance between the sampling point and the center point, the temperature collected at the sampling point may be different from the actual temperature of the center point. Therefore, if the center point temperature is directly represented by the sampling point temperature, it may not be accurate, and the center point temperature of the constant temperature and humidity chamber needs to be calibrated by the sampling point temperature.

[0039] Step S103: determining the absolute humidity of the sampling point based on the temperature of the sampling point.

[0040] Step S104: based on the calibrated center point temperature and the sampling point absolute humidity, calibrate the center point relative humidity of the constant temperature and humidity chamber.

[0041] Based on the methods described in steps S101 to S104 above, the present application calibrates the center point temperature of the constant temperature and humidity chamber based on the sampling point temperature, determines the absolute humidity of the sampling point based on the sampling point temperature, and then adaptively calibrates the center point relative humidity based on the calibrated center point temperature and the sampling point absolute humidity, thereby improving the temperature and humidity measurement accuracy of the constant temperature and humidity chamber and ensuring the use effect of the constant temperature and humidity chamber.

[0042] The above steps S101 to S104 are further explained below.

[0043] With respect to step S101, the temperature of the sampling point of the constant temperature and humidity chamber is obtained.

[0044] Specifically, the temperature at the sampling point is collected by a temperature and humidity sensor installed in the constant temperature and humidity chamber. The temperature and humidity sensor can be installed behind the air duct plate at the rear of the constant temperature and humidity chamber. The sampling point can be the probe position of the temperature and humidity sensor of the constant temperature and humidity chamber. Figure 2 As shown, point b is the sampling point and point a is the center point.

[0045] For step S102, in one embodiment, calibrating the center point temperature of the constant temperature and humidity chamber based on the sampling point temperature includes: obtaining the temperature difference value corresponding to the sampling point temperature based on the sampling point temperature and a preset corresponding relationship, wherein the preset corresponding relationship includes the corresponding relationship between the sampling point temperature and the temperature difference value between the sampling point temperature and the center point temperature; determining the calibrated center point temperature based on the sampling point temperature and the temperature difference value corresponding to the sampling point temperature.

[0046] Specifically, the center point is the center position of the constant temperature and humidity chamber, and the temperature and humidity displayed by the constant temperature and humidity chamber are usually regarded as representing the temperature and humidity information at its center position. However, due to the certain distance between the sampling point and the center point, the temperature collected at the sampling point may be different from the actual temperature of the center point. Therefore, if the center point temperature is directly represented by the sampling point temperature, it may not be accurate, and the center point temperature of the constant temperature and humidity chamber needs to be calibrated by the sampling point temperature.

[0047] By matching the sampling point temperature with the sampling point temperature in the preset corresponding relationship, the temperature difference value corresponding to the sampling point temperature is determined, and then the center point temperature is determined based on the sampling point temperature and the determined temperature difference value, and the center point temperature is the calibrated center point temperature. The preset corresponding relationship includes the corresponding relationship between the sampling point temperature and the temperature difference value between the sampling point temperature and the center point temperature.

[0048] In one embodiment, the preset corresponding relationship is determined by the following steps: obtaining a plurality of sampling point measured temperatures of different temperature values ​​and the corresponding center point measured temperatures; determining the temperature difference between the sampling point measured temperature of each temperature value and the corresponding center point measured temperature based on the plurality of sampling point measured temperatures of different temperature values ​​and the corresponding center point measured temperatures; establishing a preset corresponding relationship between the sampling point temperature and the temperature difference between the sampling point temperature and the center point temperature based on each of the sampling point measured temperatures and the temperature difference between the sampling point measured temperature and the corresponding center point measured temperature.

[0049] Specifically, in the preparatory stage, the measured temperatures of multiple sampling points with different temperature values ​​and the central point measured temperature corresponding to each sampling point measured temperature are collected, and the temperature difference between the measured temperature of each sampling point and the corresponding central point measured temperature is calculated, that is, the temperature difference = central point measured temperature - sampling point measured temperature.

[0050] Draw a scatter plot based on the measured temperature at the sampling point and the corresponding temperature difference value. The scatter plot is as follows Figure 3 As shown, the horizontal axis of the coordinate is the measured temperature of the sampling point, and the vertical axis is the temperature difference between the measured temperature of the sampling point and the corresponding measured temperature of the center point. The fitting equation corresponding to the discrete point is obtained by the least squares method.

[0051] The calculation process is as follows:

[0052] Assume the equation: f(x)=ax 4 +bx 3 +cx 2 +dx+e

[0053] According to the least squares method, we get the formula: ∈=∑(f(x i )-y i ) 2 =∑(ax 4 +bx 3 +cx 2 +dx+ey i ) 2

[0054] Then, according to the multivariate differential equation, the partial derivatives of the four constant terms are calculated respectively (the point where the derivative is 0 is the extreme point), that is, the solution of the equation Substituting the data in Table 1, we can get the fitting equation corresponding to the measured temperature and temperature difference at the sampling point: y=0.00004x 5 -0.0018x 4 +0.0289x 3 -0.1906x 2 +0.5991x-0.4347

[0055] Where x is the measured temperature at the sampling point and y is the temperature difference. Table 1

[0056] In practical applications, when the temperature and humidity sensor collects a new sampling point temperature, it can be substituted into the obtained fitting equation to calculate the temperature difference of the corresponding center point temperature. Then, the temperature difference value is added to the sampling point temperature to obtain the calibrated center point temperature.

[0057] For step S103, in one embodiment, determining the absolute humidity of the sampling point based on the temperature of the sampling point includes: obtaining the actual vapor pressure of the sampling point, the volume value of the air in the constant temperature and humidity chamber, a preset ideal gas constant and a preset molar mass; determining the absolute humidity of the sampling point based on the temperature of the sampling point, the actual vapor pressure of the sampling point, the volume value, the preset ideal gas constant and the preset molar mass.

[0058] In one embodiment, obtaining the actual vapor pressure at the sampling point includes: obtaining the relative humidity and saturated vapor pressure at the sampling point; and obtaining the actual vapor pressure at the sampling point based on the relative humidity and saturated vapor pressure at the sampling point.

[0059] Specifically, the relative humidity of the sampling point is obtained based on the temperature and humidity sensor. Based on the corresponding relationship between the saturated vapor pressure and the temperature, the saturated vapor pressure of the sampling point is determined by the temperature of the sampling point.

[0060] The actual vapor pressure at the sampling point is calculated based on the relative humidity and saturated vapor pressure at the sampling point. The actual vapor pressure calculation formula is as follows: Pwb=RHb*VPb

[0061] Among them, Pwb is the actual vapor pressure at the sampling point, RHb is the relative humidity at the sampling point, and VPb is the saturated vapor pressure at the sampling point.

[0062] In one embodiment, determining the absolute humidity at the sampling point based on the temperature at the sampling point, the actual vapor pressure at the sampling point, the volume value, the preset ideal gas constant and the preset molar mass includes: determining the water vapor mass based on the temperature at the sampling point, the actual vapor pressure at the sampling point, the volume value, the preset ideal gas constant and the preset molar mass; determining the absolute humidity at the sampling point based on the water vapor mass and the volume value.

[0063] Specifically, the water vapor mass is calculated based on the temperature at the sampling point, the actual vapor pressure at the sampling point, the volume value of the air in the constant temperature and humidity chamber, the preset ideal gas constant, and the preset molar mass. The water vapor mass calculation formula is as follows: m=(Pwb*V) / (R*Tb)*Mw

[0064] In the formula, m is the mass of water vapor, Pwb is the actual vapor pressure at the sampling point, V is the volume of air in the constant temperature and humidity chamber, R is the ideal gas constant (8.314 J / (mol·K)), Tb is the temperature at the sampling point. In actual calculations, the temperature at the sampling point needs to be converted to absolute temperature (unit: Kelvin). Mw is the preset molar mass, which is the molar mass of water (18.015 g / mol).

[0065] Divide the calculated water vapor mass by the volume value to get the absolute humidity at the sampling point. The absolute humidity is the water content per cubic meter of air. The calculation formula is: α(b)=m / V

[0066] Where α(b) is the absolute humidity at the sampling point, m is the mass of water vapor, and V is the volume of air in the constant temperature and humidity chamber.

[0067] For step S104, in one embodiment, calibrating the center point relative humidity of the constant temperature and humidity chamber based on the calibrated center point temperature and the sampling point absolute humidity includes: obtaining the center point saturated vapor pressure when the center point absolute humidity is equal to the sampling point absolute humidity; and determining the calibrated center point relative humidity based on the center point temperature, the center point saturated vapor pressure, the volume value, the preset ideal gas constant, the preset molar mass and the sampling point absolute humidity.

[0068] Specifically, in the closed box of the constant temperature and humidity chamber, when the internal fan circulates normally, it is assumed that the absolute humidity at each point in the chamber is the same. When the absolute humidity at the center point is equal to the absolute humidity at the sampling point, assuming that the volume of the constant temperature and humidity chamber is 1m 3 , then the water vapor mass is equivalent to the absolute humidity: m / 1=α(b)=α(a)

[0069] Where m is the mass of water vapor, α(b) is the absolute humidity at the sampling point, and α(a) is the absolute humidity at the center point.

[0070] Based on the water vapor mass calculation formula: (Pwb*V) / (R*Tb)*Mw=(Pwa*V) / (R*Ta)*Mw

[0071] Where Pwb is the actual vapor pressure at the sampling point, V is the volume of air in the constant temperature and humidity chamber, R is the ideal gas constant (8.314 J / (mol·K)), Tb is the temperature at the sampling point, Mw is the preset molar mass, which is the molar mass of water (18.015 g / mol), Pwa is the actual vapor pressure at the center point, and Ta is the center point temperature. In actual calculations, the center point temperature needs to be converted to absolute temperature (unit: Kelvin).

[0072] Substituting the actual vapor pressure calculation formula into the above formula, we get: (RHb*VPb*V) / (R*Tb)*Mw=(RHa*VPa*V) / (R*Ta)*Mw

[0073] Wherein, RHb is the relative humidity at the sampling point, VPb is the saturated vapor pressure at the sampling point, RHa is the relative humidity at the center point, VPa is the saturated vapor pressure at the center point, and the saturated vapor pressure at the center point is determined by the center point temperature based on the corresponding relationship between the saturated vapor pressure and temperature.

[0074] Substitute the determined sampling point absolute humidity α(b) and the center point saturated vapor pressure VPa, volume value V, ideal gas constant R, center point temperature Ta, and preset molar mass Mw into the above formula to determine the calibrated center point relative humidity RHa.

[0075] It should be pointed out that although the various steps in the above embodiments are described in a specific order, those skilled in the art can understand that in order to achieve the effect of the present application, different steps do not have to be executed in such an order. They can be executed simultaneously (in parallel) or in other orders. These adjusted schemes are equivalent to the technical schemes described in this application, and therefore will also fall within the scope of protection of this application.

[0076] Another aspect of the present application provides a humidity calibration device.

[0077] See attached Figure 4 , Figure 4 Schematic diagram of the main structure of a humidity calibration device according to an embodiment of the present application. Figure 4 As shown, the humidity calibration device in the embodiment of the present application is applied to a constant temperature and humidity chamber, and the device includes: an acquisition module 41, a temperature calibration module 42, an absolute humidity determination module 43, and a relative humidity calibration module 44.

[0078] In some embodiments, one or more of the acquisition module 41, the temperature calibration module 42, the absolute humidity determination module 43, and the relative humidity calibration module 44 can be combined into one module. In some embodiments, the acquisition module 41 can be configured to acquire the sampling point temperature of the constant temperature and humidity chamber. The temperature calibration module 42 can be configured to calibrate the center point temperature of the constant temperature and humidity chamber based on the sampling point temperature. The absolute humidity determination module 43 can be configured to determine the absolute humidity of the sampling point based on the sampling point temperature. The relative humidity calibration module 44 can be configured to calibrate the center point relative humidity of the constant temperature and humidity chamber based on the calibrated center point temperature and the sampling point absolute humidity. In one embodiment, the description of the specific implementation function can be found in steps S101-S104.

[0079] The humidity calibration device is used to perform Figure 1 The humidity calibration method embodiment shown in the figure has similar technical principles, technical problems solved and technical effects produced. Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working process and related instructions of the humidity calibration device can refer to the contents described in the embodiment of the humidity calibration device, which will not be repeated here.

[0080] It is understood by those skilled in the art that all or part of the processes in the method for implementing the above-mentioned embodiment of the present application can also be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of the above-mentioned various method embodiments when executed by the processor. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable storage medium may include: any entity or device, medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory, random access memory, electrical carrier signal, telecommunication signal and software distribution medium, etc. that can carry the computer program code.

[0081] Another aspect of the present application provides a constant temperature and humidity chamber.

[0082] See attached Figure 5 , Figure 5 Schematic diagram of the main structure of a constant temperature and humidity chamber according to an embodiment of the present application. Figure 5 As shown, in an embodiment of a constant temperature and humidity chamber according to the present application, the constant temperature and humidity chamber may include a humidity calibration device 51, a sensor 52, at least one processor 53; and a memory 54 connected to the at least one processor 53 in communication; wherein the memory 54 may be configured to store a program for executing the humidity calibration method of the above method embodiment, and the processor 53 may be configured to execute the program in the memory 54, which includes but is not limited to the program for executing the humidity calibration method of the above method embodiment. For ease of explanation, only the parts related to the embodiment of the present application are shown. For specific technical details not disclosed, please refer to the method part of the embodiment of the present application. The constant temperature and humidity chamber may be a constant temperature and humidity device formed by various electronic devices.

[0083] Another aspect of the present application also provides a computer-readable storage medium.

[0084] In an embodiment of a computer-readable storage medium according to the present application, the computer-readable storage medium may be configured to store a program for executing the humidity calibration method of the above method embodiment, and the program may be loaded and run by a processor to implement the above humidity calibration method. For ease of explanation, only the parts related to the embodiment of the present application are shown. For specific technical details not disclosed, please refer to the method part of the embodiment of the present application. The computer-readable storage medium may be a storage device formed by various electronic devices. Optionally, the computer-readable storage medium in the embodiment of the present application is a non-temporary computer-readable storage medium.

[0085] So far, the technical solution of the present application has been described in conjunction with an embodiment shown in the accompanying drawings, but it is easy for those skilled in the art to understand that the protection scope of the present application is obviously not limited to these specific embodiments. Without departing from the principles of the present application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present application.

Claims

1. A humidity calibration method, applied to a constant temperature and humidity chamber, characterized in that: The method comprises: Get the sampling point temperature of the constant temperature and humidity chamber; Calibrate the center point temperature of the constant temperature and humidity chamber based on the sampling point temperature; determining the absolute humidity at the sampling point based on the temperature at the sampling point; Based on the calibrated center point temperature and the sampling point absolute humidity, the center point relative humidity of the constant temperature and humidity chamber is calibrated.

2. The humidity calibration method according to claim 1, characterized in that: The method of calibrating the center point temperature of the constant temperature and humidity chamber based on the sampling point temperature includes: Based on the sampling point temperature and a preset corresponding relationship, a temperature difference value corresponding to the sampling point temperature is obtained, wherein the preset corresponding relationship includes a corresponding relationship between the sampling point temperature and a temperature difference value between the sampling point temperature and the center point temperature; Based on the sampling point temperature and the temperature difference value corresponding to the sampling point temperature, a calibrated center point temperature is determined.

3. The humidity calibration method according to claim 2, characterized in that: The preset corresponding relationship is determined by the following steps: Obtain the measured temperatures of multiple sampling points with different temperature values ​​and the corresponding measured temperatures of the center point; Based on the sampling point measured temperatures of the plurality of different temperature values ​​and the corresponding center point measured temperatures, determining a temperature difference between the sampling point measured temperature of each temperature value and the corresponding center point measured temperature; Based on the measured temperature of each sampling point and the temperature difference between the measured temperature of the sampling point and the corresponding measured temperature of the center point, a preset corresponding relationship between the temperature of the sampling point and the temperature difference between the temperature of the sampling point and the temperature of the center point is established.

4. The humidity calibration method according to claim 1, characterized in that: The determining the absolute humidity of the sampling point based on the temperature of the sampling point comprises: Obtain the actual vapor pressure at the sampling point, the volume value of the air in the constant temperature and humidity chamber, the preset ideal gas constant and the preset molar mass; The absolute humidity at the sampling point is determined based on the temperature at the sampling point, the actual vapor pressure at the sampling point, the volume value, the preset ideal gas constant and the preset molar mass.

5. The humidity calibration method according to claim 4, characterized in that: The obtaining of the actual vapor pressure at the sampling point comprises: Obtaining the relative humidity and saturated vapor pressure of the sampling point; The actual vapor pressure at the sampling point is obtained based on the relative humidity and the saturated vapor pressure at the sampling point.

6. The humidity calibration method according to claim 4, characterized in that: The determining of the absolute humidity at the sampling point based on the temperature at the sampling point, the actual vapor pressure at the sampling point, the volume value, the preset ideal gas constant and the preset molar mass comprises: determining the water vapor mass based on the sampling point temperature, the sampling point actual vapor pressure, the volume value, the preset ideal gas constant, and the preset molar mass; The absolute humidity at the sampling point is determined based on the water vapor mass and the volume value.

7. The humidity calibration method according to claim 4, characterized in that: The step of calibrating the relative humidity at the center point of the constant temperature and humidity chamber based on the calibrated center point temperature and the absolute humidity at the sampling point comprises: When the absolute humidity at the center point is equal to the absolute humidity at the sampling point, obtaining the saturated vapor pressure at the center point; The calibrated center point relative humidity is determined based on the center point temperature, the center point saturated vapor pressure, the volume value, the preset ideal gas constant, the preset molar mass and the sampling point absolute humidity.

8. A humidity calibration device, applied to a constant temperature and humidity chamber, characterized in that: The device comprises: An acquisition module is used to obtain the temperature of the sampling point of the constant temperature and humidity chamber; A temperature calibration module, used for calibrating the center point temperature of the constant temperature and humidity chamber based on the sampling point temperature; An absolute humidity determination module, used to determine the absolute humidity of a sampling point based on the temperature of the sampling point; The relative humidity calibration module is used to calibrate the relative humidity at the center point of the constant temperature and humidity chamber based on the calibrated center point temperature and the absolute humidity at the sampling point.

9. A constant temperature and humidity chamber, comprising a humidity calibration device, a sensor, at least one processor and at least one memory, wherein the memory is suitable for storing a plurality of program codes, characterized in that: The program code is suitable for being loaded and executed by the processor to perform the humidity calibration method according to any one of claims 1 to 7.

10. A computer-readable storage medium storing a plurality of program codes, characterized in that: The program code is suitable for being loaded and run by a processor to execute the humidity calibration method according to any one of claims 1 to 7.

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