CN119023606A - A measurement and calibration method for infrared moisture meter - Google Patents
A measurement and calibration method for infrared moisture meter Download PDFInfo
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- CN119023606A CN119023606A CN202411281326.6A CN202411281326A CN119023606A CN 119023606 A CN119023606 A CN 119023606A CN 202411281326 A CN202411281326 A CN 202411281326A CN 119023606 A CN119023606 A CN 119023606A
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- 238000000034 method Methods 0.000 title claims abstract description 44
- 238000005259 measurement Methods 0.000 title claims description 28
- 238000012360 testing method Methods 0.000 claims abstract description 33
- 238000001035 drying Methods 0.000 claims abstract description 11
- 238000005303 weighing Methods 0.000 claims description 14
- 239000002274 desiccant Substances 0.000 claims description 6
- 238000004364 calculation method Methods 0.000 claims description 5
- 239000003153 chemical reaction reagent Substances 0.000 claims description 5
- 230000007613 environmental effect Effects 0.000 claims description 3
- 238000007605 air drying Methods 0.000 claims description 2
- 239000000203 mixture Substances 0.000 description 6
- 238000001514 detection method Methods 0.000 description 5
- 241000208125 Nicotiana Species 0.000 description 4
- 235000002637 Nicotiana tabacum Nutrition 0.000 description 4
- 239000011087 paperboard Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000012937 correction Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000011363 dried mixture Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000031700 light absorption Effects 0.000 description 1
- 238000012886 linear function Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000275 quality assurance Methods 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 238000005316 response function Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
- 238000007619 statistical method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/3554—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for determining moisture content
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/27—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands using photo-electric detection ; circuits for computing concentration
- G01N21/274—Calibration, base line adjustment, drift correction
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/3554—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for determining moisture content
- G01N21/3559—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for determining moisture content in sheets, e.g. in paper
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Abstract
本发明公开了一种红外水分仪计量校准方法，涉及测量设备的校准方法技术领域，包括以下步骤：S1、烘干白卡纸：此时的水分含量标为0％；S2、标定红外水分仪：转移S1中白卡纸至实验室低湿环境，得出该标定点的标准水分含量、水分含量示值；接着转移白卡纸至湿热试验箱内多次提高对白卡纸的水分含量，得出这些标定点的标准水分含量、水分含量示值；S3、测量并计算红外水分仪的水分含量示值误差；S4、测量并计算红外水分仪的稳定性。本发明以均一的白卡纸作为介质保证计量校准的准确性，利用湿热试验箱实现在较宽的含水率范围的计量校准，形成能够广泛适用的红外水分仪计量校准方法，保证红外水分仪计量校准的准确性和稳定性。
The invention discloses a method for measuring and calibrating an infrared moisture meter, and relates to the technical field of calibration methods for measuring equipment, and includes the following steps: S1, drying white cardboard: the moisture content at this time is marked as 0%; S2, calibrating the infrared moisture meter: transferring the white cardboard in S1 to a low-humidity environment in a laboratory, and obtaining the standard moisture content and moisture content indication of the calibration point; then transferring the white cardboard to a damp heat test box to increase the moisture content of the white cardboard for multiple times, and obtaining the standard moisture content and moisture content indication of these calibration points; S3, measuring and calculating the moisture content indication error of the infrared moisture meter; S4, measuring and calculating the stability of the infrared moisture meter. The invention uses uniform white cardboard as a medium to ensure the accuracy of metrological calibration, and uses a damp heat test box to achieve metrological calibration in a wider range of moisture content, forming a widely applicable infrared moisture meter metrological calibration method, and ensuring the accuracy and stability of the infrared moisture meter metrological calibration.
Description
Technical Field
The invention relates to the technical field of calibration methods of measurement equipment, in particular to a metering calibration method of an infrared moisture meter.
Background
The principle of the infrared moisture meter is that infrared light with specific wavelength is adopted to irradiate a measured sample, water molecules in the measured sample can absorb the infrared light, the absorbed infrared light is reflected to an infrared sensor, the sensor can measure infrared light absorption intensity, and then the moisture content of the measured sample is obtained by utilizing the relation between the absorption intensity and the moisture content. The infrared moisture meter is mainly applied to industries such as tobacco, printing, metallurgy and the like. The accuracy of the infrared moisture meter is directly influenced by the quality assurance of related products, so that the accuracy of the infrared moisture meter is guaranteed through metering calibration.
The currently known infrared moisture meter calibration methods include:
The invention discloses a calibration method of a moisture meter according to a Chinese patent with a patent publication number of CN114441469A, which comprises the following steps: acquiring a first initial moisture value obtained by detecting moisture of a detection sample by using a target moisture meter; acquiring a first moisture value obtained by detecting moisture of a detection sample by using an oven; determining a first deviation value according to the first initial moisture value and the first moisture value; determining a first correction value of the target moisture meter according to the first calibration linear function and the first deviation value; and performing zero calibration on the target moisture meter by using the first correction value.
The invention discloses a calibration method of an infrared moisture meter according to a Chinese patent with a patent publication number of CN102183474A, which comprises the following process steps: taking 1000 g of mixture to prepare 7 standard moisture samples, wherein the moisture content of the samples is 3-9% (the ratio of water to the mixture in the samples), placing the mixture samples under an infrared moisture meter for detection, adding a sampling detection data table, wherein one of the table comprises the moisture content of the mixture standard samples, the moisture content is 3-9%, and the other is actual measurement moisture, namely the actual value of the mixture standard samples detected by the infrared moisture meter, analyzing and calculating each group of data in the table, and rapidly calibrating the infrared moisture meter.
The invention discloses an automatic calibration method of a moisture meter according to a Chinese patent with a patent publication number of CN115165789A, which comprises the following steps: manufacturing a standard moisture material and detecting and recording a display value by using a moisture meter; the calibrator adjusts the corrected value T of the moisture meter up or down according to the true value of the moisture of the standard moisture material; the standard moisture materials are put under the moisture meter again for detection, and the adjustment quantity and the actual response quantity of the moisture meter with corresponding quantity are obtained through multiple adjustment and tracking; the controller obtains the moisture meter adjustment response function by taking the moisture meter adjustment response data as a sample through a statistical method.
The infrared moisture meter calibration methods all adopt inhomogeneous media, tobacco leaves, cut tobacco and the like are adopted in the tobacco industry and are also inhomogeneous media, and the inhomogeneity of the media can reduce the accuracy of the infrared moisture meter calibration. In addition, the used medium is a daily test product of each infrared moisture meter, and the water content of the medium is generally only in a narrow range and cannot cover the range of the infrared moisture meter. Moreover, the daily test product is used as a medium mainly for daily quality control of a specific instrument, and a unified performance evaluation mode is difficult to provide for infrared moisture meters in different use fields.
Disclosure of Invention
The invention aims to solve the defects in the prior art, and provides a metering calibration method for an infrared moisture meter, which adopts a uniform medium to ensure accuracy, can meter and calibrate in a wider moisture content range, is applicable to different fields, and evaluates the method from two aspects of accuracy and stability.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the metering calibration method of the infrared moisture meter comprises the following steps of:
S1, calibrating the environmental conditions of an infrared moisture meter and required equipment, media and reagents;
s2, calibrating an infrared moisture meter: drying the white cardboard in a blast drying oven, marking the moisture content at the moment as 0%, weighing the mass of the white cardboard by an electronic balance, transferring the dried white cardboard to a laboratory low-humidity environment until the moisture content is stable, weighing the mass of the white cardboard by the electronic balance, measuring and calculating the standard moisture content of the standard point, and simultaneously measuring the moisture content indication value of the standard point by an infrared moisture meter; transferring the white cardboard to a damp-heat test box or a constant temperature and humidity box for a period of time to improve the moisture content of the white cardboard, taking out, weighing the white cardboard by an electronic balance, measuring and calculating the standard moisture content of the standard point, recording the moisture content indication value of the standard point by an infrared moisture meter, repeatedly putting the white cardboard into the damp-heat test box or the constant temperature and humidity box for a plurality of times, and continuously and uniformly improving the moisture content of the white cardboard for a plurality of times to obtain the standard moisture content and the moisture content indication value of the white cardboard of a plurality of standard points;
S3, measuring and calculating a moisture content indication error of the infrared moisture meter: the method is the same as the operation method of S1 and S2, a plurality of dried white boards are placed in a laboratory low-humidity environment or a high-humidity environment of a damp-heat test box, and are weighed by an electronic balance to obtain white boards with different moisture contents, the moisture contents are used as standard moisture contents, and simultaneously, the moisture content indication values of the white boards are measured by an infrared moisture meter, and the moisture content indication value errors of the white boards are calculated;
S4, measuring and calculating the stability of the infrared moisture meter: and (3) calibrating the infrared moisture meter, directly repeating the step S3 to obtain the moisture content indication errors of the white cardboard after 2 hours, and calculating to obtain the stability of the infrared moisture meter.
Furthermore, the thickness of the white cardboard is 250-350 mu m, the white cardboard is round in shape, and the diameter of the white cardboard is used for ensuring that the measuring light spot of the infrared moisture meter is completely positioned in the white cardboard.
Further, the temperature adjustment range of the damp-heat test box or the constant temperature and humidity box is 10-50 ℃, and the humidity adjustment range is 35-95% RH; the temperature deviation is not more than +/-1.5 ℃, and the humidity deviation is not more than +/-3% RH.
Further, in S2, the calculation formula of the standard moisture content is (m n-m0)/m0;
Wherein m 0 is the mass of the white cardboard which is weighed and recorded by the electronic balance when the moisture content is 0%, and m n is the mass of the white cardboard which is weighed and recorded by the electronic balance except that the moisture content is 0%.
Further, in the step S2, before the white cardboard is put into the damp heat test box or the constant temperature and humidity box, the temperature and humidity balance in the box is set in advance, and the time length of the white cardboard put into the damp heat test box or the constant temperature and humidity box for a single time is adjusted according to the required moisture content.
Further, in the step S2, the range of the calibration point of the moisture content should include the range of the moisture content measured by the infrared moisture meter daily, and at least 5 calibration points are uniformly selected within the calibration range, and the range includes the moisture content of 0%.
Further, in S3, the white cardboard with different moisture contents has at least three sections, i.e. high, medium and low sections, with three different moisture contents in the marked range in S2.
Further, in the step S3, a calculation formula of the moisture content indication error is Δc i＝Ci-CSi;
Wherein, in the formula:
Δc i is the moisture content indication error of the ith moisture content measurement point,%;
c i is the instrument moisture content indication value of the ith moisture content measurement point,%;
c Si is the moisture content,%, of the i-th moisture content measurement point calculated by the electronic balance weighing.
Further, in S4, the stability calculation formula of the infrared moisture meter is Δs=Δc i'-ΔCi;
wherein Δc i is the stability of the ith moisture content measurement point,%;
Δc i is the moisture content indication error of the ith moisture content measurement point,%;
After Δc i' is 2 hours, the moisture content indication error of the ith moisture content measurement point,%.
Further, when the white cardboard is taken out and transferred from the forced air drying box, or the white cardboard is taken out and transferred from the damp-heat test box or the constant temperature and humidity box, the white cardboard is put into a container filled with a drying agent.
Compared with the prior art, the invention has the beneficial effects that:
In the application, the white cardboard is used as a medium for metering and calibrating the infrared moisture meter, the uniformity of the medium is good, the size is easy to control, and compared with the inhomogeneous mixture adopted in the prior art, the metering and calibrating accuracy of the infrared moisture meter can be better ensured; in the metering calibration process, the white cardboard with uniform medium is combined with a damp-heat test box or a constant temperature and humidity box, the dried white cardboard with the moisture content of 0% is used as a calibration starting point, the moisture content of the white cardboard is gradually increased by the damp-heat test box or the constant temperature and humidity box for metering calibration, and compared with the existing metering calibration method for obtaining different moisture content ranges by adopting a dried mixture, the metering calibration method provided by the application can be used for metering calibration of an infrared moisture meter in a wider moisture content range; meanwhile, the whole method can be suitable for metering calibration of the infrared moisture meter used in different fields, so that the widely applicable metering calibration method of the infrared moisture meter is formed, and the accuracy and stability of the metering calibration of the infrared moisture meter are improved as a whole.
Drawings
FIG. 1 is a flow chart of the infrared moisture meter metering calibration in the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments.
The implementation principle of the embodiment of the application is as follows: taking a uniform white cardboard as a medium, calibrating an infrared moisture meter by increasing the moisture content in a laboratory low-humidity environment and in a damp-heat test box or a constant-temperature constant-humidity box for multiple times after drying the white cardboard to obtain a calibration range, taking a plurality of white cardboard sheets with different moisture contents in the calibration range after calibration, measuring and calculating to obtain a moisture content indication error of the infrared moisture meter, and finally not calibrating the meter after 2 hours to obtain the moisture content indication error of the white cardboard, and calculating to obtain the stability of the infrared moisture meter so as to meet the standard determination and stability of the measurement and calibration of the infrared moisture meter.
Example 1
The embodiment is an infrared moisture meter metering calibration method, which specifically comprises the following steps:
S1, calibrating the environment condition of the infrared moisture meter and the needed equipment, medium and reagent.
The calibration environmental conditions include: the calibration temperature conditions were: 15-30 ℃; the conditions of the calibrated humidity are: a dehumidifier may be employed to meet ambient humidity conditions with humidity no greater than 45% rh.
In the metering and calibrating method of the infrared moisture meter, the white cardboard is used as a medium, wherein the white cardboard has the thickness of 250-350 mu m, the shape of the white cardboard is circular, the diameter is in order to ensure that a measuring light spot of the infrared moisture meter is completely positioned in the circular white cardboard, and the diameter is preferably about 11.5cm; the moisture content of the white cardboard is improved by adopting a damp-heat test box or a constant temperature and humidity box, wherein the temperature adjustment range of the damp-heat test box or the constant temperature and humidity box is 10-50 ℃, the humidity adjustment range is 35-95% RH, the temperature deviation is not more than +/-1.5 ℃, and the humidity deviation is not more than +/-3% RH.
In addition, the equipment and reagents required for calibrating the infrared moisture meter also include:
The temperature regulation range of the blast drying box for drying the white cardboard is room temperature to 150 ℃, the temperature fluctuation degree is not more than +/-1.0 ℃, and the temperature uniformity is not more than +/-2.0 ℃;
an electronic balance for weighing, having an index value of not more than 0.1mg;
the desiccant used for keeping dry environment can be allochroic silica gel, etc.
The following steps S2-S4 are performed using a damp heat test chamber.
S2: and calibrating an infrared moisture meter.
Before the error of the moisture content indication of the measuring instrument, the infrared moisture meter is calibrated.
Firstly, shan Zhangbai paperboard is put into a blast drying box, the temperature of the blast drying box is set to 105 ℃, the white paperboard is taken out from the blast drying box after being dried for 2 hours, and the white paperboard is immediately put into a container which is filled with a drying agent in advance, and the drying agent is not in direct contact with the white paperboard. And (3) adjusting the infrared moisture meter to a calibration mode, placing the dried white cardboard at the position of a measuring light spot of the infrared moisture meter, marking the moisture content at the moment as 0%, then immediately weighing the white cardboard on an electronic balance, recording the mass m 0 of the white cardboard, and keeping the position of the electronic balance as close to the infrared moisture meter to be measured as possible.
And then, placing the white cardboard in a low-humidity environment of a laboratory, weighing the mass m 1 of the white cardboard by using an electronic balance when the moisture content of the white cardboard reaches relative stability, taking m 1-m0)/m0 as the standard moisture content of the calibration point, and immediately measuring the moisture content of the white cardboard by using an infrared moisture meter and calibrating.
After the moisture content of the white cardboard is difficult to continuously rise in a laboratory low-humidity environment, the white cardboard is placed into a damp-heat test box, the damp-heat test box is set in advance and reaches temperature and humidity balance, preferably, the temperature of the damp-heat test box is 20 ℃, the humidity of the damp-heat test box is 80% RH, the white cardboard is placed into the damp-heat test box for about 20 seconds, then is taken out, the white cardboard is placed on an electronic balance to weigh the mass m 2 of the white cardboard, at the moment, (m 2-m0)/m0 is used as the standard moisture content of the calibration point, and then the moisture content of the white cardboard is measured and calibrated by an infrared moisture meter immediately.
If the damp-heat test box and the electronic balance are not in the same room, the white cardboard is taken out and then is placed into a container with a drying agent in advance and then is transferred to the electronic balance, so that the white cardboard is kept dry in the transfer process, the moisture content of the white cardboard is prevented from being changed in the transfer process, and the calibration accuracy of the infrared moisture meter is improved.
The time length of the white cardboard placed in the damp-heat test box can be properly adjusted according to the required moisture content.
The range of the moisture content calibration points comprises the daily measured moisture content range of the infrared moisture meter to be measured, and at least 5 calibration points are uniformly selected in the range, wherein the calibration points comprise the moisture content of 0%.
S3, measuring instrument moisture content indication error.
And (2) the same as the operation method of S2, placing a plurality of dried white cardboard in a laboratory low-humidity environment or a high-humidity environment of a damp-heat test box, and weighing by an electronic balance to obtain white cardboard with different moisture contents C Si, wherein C Si is used as the standard moisture content.
At least three white boards with different moisture contents are adopted, and the white boards with different moisture contents are preferred in the embodiment. And, the three different moisture contents should be in the three high, middle and low stages of the nominal range in S2, preferably about 80%, 50% and 20% of the upper limit of the nominal range.
The white cardboard is then measured by an infrared moisture meter, the moisture content indication C i on the infrared moisture meter is recorded, and the moisture content indication error delta C i is calculated according to the formula (1).
ΔCi＝Ci-CSi (1)
Wherein:
Δc i —moisture content indication error of the ith moisture content measurement point,%;
C i -instrument moisture content indication of the ith moisture content measurement point,%;
c Si -moisture content of the i-th moisture content measurement point calculated by electronic balance weighing,%.
S4, measuring and calculating the stability of the infrared moisture meter.
After S2 and S3 are completed for 2 hours, the operation of S3 is directly repeated without calibrating the infrared moisture meter, so that the moisture content indication error delta C i' of the white cardboard with the three different moisture contents in S3 is obtained, and the white cardboard also at least comprises three different moisture contents of high, medium and low. The stability Δs of the infrared moisture meter was calculated according to equation (2).
ΔS＝ΔCi' -ΔCi (2)
In the formula (2):
Δc i —stability of the ith moisture content measurement point,%;
Δc i —initially, moisture content indication error of the ith moisture content measurement point,%;
After Δc i' — 2h, the moisture content indication error of the i-th moisture content measurement point,%.
Test examples
The ambient conditions of the infrared moisture meter and the required equipment, media and reagents were first calibrated according to S1 in example 1.
The infrared hygrometer was then calibrated as in S1 of example 1, with calibration process data as shown in Table 1.
The standard moisture content is calculated by weighing through an electronic balance, and the infrared moisture meter is calibrated according to the standard moisture content.
Table 1 infrared moisture meter calibration process data
Then, the error of the moisture content indication value of the infrared moisture meter was measured in the same manner as in S3 of example 1, and the data are shown in Table 2.
Table 2 moisture content indication error measurement data of infrared moisture meter
As can be seen from Table 2, the infrared moisture meter measuring and calibrating method of the embodiment 1 of the application can well realize the measurement of the accuracy of the infrared moisture meter.
Finally, the stability of the infrared hygrometer was measured as in S4 of example 1, and the data are shown in Table 3.
Table 3 stability measurement data of infrared moisture meter
As can be seen from Table 3, the infrared moisture meter measuring and calibrating method of the embodiment 1 of the application can well realize the measurement of the stability of the infrared moisture meter.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (10)
1. The metering calibration method of the infrared moisture meter is characterized by comprising the following steps of:
S1, calibrating the environmental conditions of an infrared moisture meter and required equipment, media and reagents;
s2, calibrating an infrared moisture meter: drying the white cardboard in a blast drying oven, marking the moisture content at the moment as 0%, weighing the mass of the white cardboard by an electronic balance, transferring the dried white cardboard to a laboratory low-humidity environment until the moisture content is stable, weighing the mass of the white cardboard by the electronic balance, measuring and calculating the standard moisture content of the standard point, and simultaneously measuring the moisture content indication value of the standard point by an infrared moisture meter; transferring the white cardboard to a damp-heat test box or a constant temperature and humidity box for a period of time to improve the moisture content of the white cardboard, taking out, weighing the white cardboard by an electronic balance, measuring and calculating the standard moisture content of the standard point, recording the moisture content indication value of the standard point by an infrared moisture meter, repeatedly putting the white cardboard into the damp-heat test box or the constant temperature and humidity box for a plurality of times, and continuously and uniformly improving the moisture content of the white cardboard for a plurality of times to obtain the standard moisture content and the moisture content indication value of the white cardboard of a plurality of standard points;
S3, measuring and calculating a moisture content indication error of the infrared moisture meter: the method is the same as the operation method of S1 and S2, a plurality of dried white boards are placed in a laboratory low-humidity environment or a high-humidity environment of a damp-heat test box, and are weighed by an electronic balance to obtain white boards with different moisture contents, the moisture contents are used as standard moisture contents, and simultaneously, the moisture content indication values of the white boards are measured by an infrared moisture meter, and the moisture content indication value errors of the white boards are calculated;
S4, measuring and calculating the stability of the infrared moisture meter: and (3) calibrating the infrared moisture meter, directly repeating the step S3 to obtain the moisture content indication errors of the white cardboard after 2 hours, and calculating to obtain the stability of the infrared moisture meter.
2. The method for calibrating the measurement of the infrared moisture meter according to claim 1, wherein the white cardboard has a thickness of 250-350 μm and a circular shape, and the diameter of the white cardboard is used for ensuring that a measuring light spot of the infrared moisture meter is completely positioned in the white cardboard.
3. The method for calibrating the measurement of the infrared moisture meter according to claim 1, wherein the temperature adjustment range of the damp-heat test box or the constant temperature and humidity box is 10-50 ℃, and the humidity adjustment range is 35-95% RH; the temperature deviation is not more than +/-1.5 ℃, and the humidity deviation is not more than +/-3% RH.
4. The method according to claim 1, wherein in S2, the standard moisture content is calculated by a formula (m n-m0)/m0;
Wherein m 0 is the mass of the white cardboard which is weighed and recorded by the electronic balance when the moisture content is 0%, and m n is the mass of the white cardboard which is weighed and recorded by the electronic balance except that the moisture content is 0%.
5. The method according to claim 1, wherein in S2, before the white cardboard is put into the damp heat test box or the constant temperature and humidity box, the temperature and humidity balance is set in advance, and the time length of putting the white cardboard into the damp heat test box or the constant temperature and humidity box once is adjusted according to the required moisture content.
6. The method according to claim 1, wherein in S2, the range of the calibration points of moisture content includes the range of moisture content measured by the infrared moisture meter daily, and at least 5 calibration points are uniformly selected within the calibration range, and the range includes 0% moisture content.
7. The method according to claim 1, wherein in S3, the white cardboard with different moisture contents has at least three sections, i.e. high, medium and low sections, with three different moisture contents in the marked range in S2.
8. The method for calibrating an infrared hygrometer according to claim 1, wherein in S3, a calculation formula of the moisture content indication error is Δc i＝Ci-CSi;
Wherein, in the formula:
Δc i is the moisture content indication error of the ith moisture content measurement point,%;
c i is the instrument moisture content indication value of the ith moisture content measurement point,%;
c Si is the moisture content,%, of the i-th moisture content measurement point calculated by the electronic balance weighing.
9. The method according to claim 1, wherein in S4, the stability calculation formula of the infrared moisture meter is Δs=Δc i'-ΔCi;
wherein Δc i is the stability of the ith moisture content measurement point,%;
Δc i is the moisture content indication error of the ith moisture content measurement point,%;
After Δc i' is 2 hours, the moisture content indication error of the ith moisture content measurement point,%.
10. The method according to claim 1, wherein the white cardboard is put into a container filled with a desiccant when the white cardboard is taken out and transferred from a forced air drying oven or when the white cardboard is taken out and transferred from a damp-heat test oven or a constant temperature and humidity oven.
Priority Applications (1)
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