CN111207834B - Infrared thermometer negative temperature calibration device and calibration method - Google Patents
Infrared thermometer negative temperature calibration device and calibration method Download PDFInfo
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- CN111207834B CN111207834B CN202010046051.3A CN202010046051A CN111207834B CN 111207834 B CN111207834 B CN 111207834B CN 202010046051 A CN202010046051 A CN 202010046051A CN 111207834 B CN111207834 B CN 111207834B
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- 238000000034 method Methods 0.000 title claims abstract description 27
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 84
- 238000005259 measurement Methods 0.000 claims description 23
- 238000003756 stirring Methods 0.000 claims description 22
- 238000012417 linear regression Methods 0.000 claims description 8
- 210000005056 cell body Anatomy 0.000 claims 3
- 238000004519 manufacturing process Methods 0.000 abstract description 11
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 10
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 5
- 239000013078 crystal Substances 0.000 abstract description 4
- 239000002699 waste material Substances 0.000 abstract description 4
- 238000013461 design Methods 0.000 abstract description 3
- 238000009413 insulation Methods 0.000 description 17
- 238000012546 transfer Methods 0.000 description 7
- 238000009529 body temperature measurement Methods 0.000 description 6
- 238000007789 sealing Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000012795 verification Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000008014 freezing Effects 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 230000005457 Black-body radiation Effects 0.000 description 1
- 229910001369 Brass Inorganic materials 0.000 description 1
- 125000003158 alcohol group Chemical group 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 230000036760 body temperature Effects 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000010200 validation analysis Methods 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/52—Radiation pyrometry, e.g. infrared or optical thermometry using comparison with reference sources, e.g. disappearing-filament pyrometer
- G01J5/53—Reference sources, e.g. standard lamps; Black bodies
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/80—Calibration
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- General Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Radiation Pyrometers (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
The invention discloses a negative temperature calibration device of an infrared thermometer, which comprises: a constant temperature alcohol tank and a blackbody cavity device arranged corresponding to the constant temperature alcohol tank; the blackbody cavity device comprises a blackbody cavity arranged in the constant-temperature alcohol tank and an alcohol tank panel connected with the open end of the blackbody cavity; the constant temperature alcohol tank is provided with a panel bayonet, and the panel of the alcohol tank is clamped on the constant temperature alcohol tank corresponding to the panel bayonet. The invention also discloses a method for calibrating the low-temperature section of the infrared thermometer; the infrared thermometer calibration device has the advantages of reasonable and ingenious structural design, high stability and high precision, and when the infrared thermometer is calibrated, the temperature calibration of the infrared thermometer can be implemented only by aligning the infrared thermometer to the blackbody cavity, so that the infrared thermometer calibration device is convenient to use; the problem that the blackbody temperature field is damaged and cannot be used continuously due to icing crystal caused by long-time use can be solved; compared with a nitrogen filling mode, the method has the advantages of no resource waste, lower use cost and contribution to automatic intelligent manufacture of the infrared thermometer.
Description
Technical Field
The invention relates to the field of infrared thermometer production, in particular to a negative temperature calibration device and a negative temperature calibration method for an infrared thermometer.
Background
The infrared temperature measurement technology plays an important role in the aspects of product quality control and monitoring, online fault diagnosis and safety protection of equipment, energy conservation and the like in the production process. In the last 20 years, the non-contact infrared human body thermometer has been developed rapidly, the performance is improved continuously, the function is enhanced continuously, the variety is increased continuously, and the application range is expanded continuously. Compared with a contact temperature measurement method, the infrared temperature measurement method has the advantages of fast response time, non-contact, safe use, long service life and the like. However, the precision of the infrared thermometer is greatly related to calibration before delivery, and how to realize calibration with higher precision is always a research focus of vast infrared thermometer manufacturers.
The precision of the existing non-contact infrared thermometers on the market is low between minus 50 ℃ and 0 ℃, basically between plus or minus 3 ℃ and plus or minus 5 ℃, and the factor causing that the precision of the negative temperature section of the non-contact infrared thermometers cannot be improved is mainly that the uniformity and the stability of the existing low-temperature black body radiation source temperature field are poor, particularly, the black body temperature field is damaged and cannot be used continuously due to the fact that the black body is easy to freeze and crystallize in the long-time use process, even if a nitrogen filling mode is used, the method is only short, resources are wasted, the price is high, and the method becomes a bottleneck station for realizing automatic and intelligent manufacturing of the infrared thermometers.
Disclosure of Invention
In order to solve the problems, the invention discloses a negative temperature calibration device and a negative temperature calibration method for an infrared thermometer.
The technical scheme adopted by the invention for realizing the purpose is as follows:
an infrared thermometer negative temperature calibration device, comprising: a constant temperature alcohol tank and a blackbody cavity device arranged corresponding to the constant temperature alcohol tank; the blackbody cavity device comprises a blackbody cavity arranged in the constant-temperature alcohol bath and an alcohol bath panel connected with the open end of the blackbody cavity; the constant-temperature alcohol tank is provided with a panel bayonet, and the alcohol tank panel is clamped on the constant-temperature alcohol tank corresponding to the panel bayonet.
The blackbody cavity comprises a hollow cylindrical portion; the upper end of the hollow cylindrical part is provided with a ray inlet, and the lower end of the hollow cylindrical part extends downwards to form a hollow conical part; and black paint layers are arranged on the inner wall surfaces of the hollow cylindrical part and the hollow conical part.
A sealing gasket is arranged at the joint of the hollow cylindrical part and the alcohol tank panel; the hollow cylindrical part, the sealing washer and the alcohol tank panel are fixedly connected in sequence.
The alcohol tank panel is also provided with a heat insulation baffle corresponding to the hollow column part; and a ray through hole is formed in the upper end face and the lower end face of the heat insulation baffle plate in a penetrating mode and corresponds to the ray inlet.
The constant-temperature alcohol tank comprises a hollow heat insulation tank body, a stirring blade and a magnetic pump for driving the stirring blade to rotate; the stirring blade is arranged inside the heat insulation groove body, and the panel bayonet is arranged at the top end of the heat insulation groove body.
A low-temperature section calibration method of the infrared thermometer implemented according to the negative temperature calibration device of the infrared thermometer comprises the following steps:
aligning an infrared thermometer to a ray inlet, and acquiring the measured temperatures of a plurality of groups of constant-temperature alcohol tanks at different actual temperatures;
calculating error temperature data according to the measured temperature data and the actual temperature data of the constant-temperature alcohol tank;
fitting the error temperature data and the measured temperature data to obtain a fitting equation of the error temperature and the measured temperature;
selecting an actual temperature as a calibration point temperature according to the fitting curve;
setting the constant temperature of the constant-temperature alcohol tank as the temperature of the calibration point, aligning the infrared tester to the ray inlet again, and collecting the calibration measurement temperature;
and calculating the compensation temperature according to the calibration measurement temperature, and adding the calibration measurement temperature and the compensation temperature to obtain the target temperature.
After the temperature of the calibration point is selected, the temperature of the calibration point is subtracted by the corresponding measured temperature and then divided by the error temperature to obtain the calibration parameter.
When calculating the compensation temperature according to the calibration measurement temperature, the method further comprises the following steps:
the compensation temperature is calculated from the measured temperature by fitting an equation in combination with the calibration parameters.
Before the infrared tester is aligned with the ray inlet, alcohol with a set amount is added into the constant-temperature alcohol tank, and the magnetic pump is started to drive the stirring blade to rotate continuously.
And after the target temperature is obtained, a linear regression equation is calculated according to the target temperature, and the fitting difference of the infrared temperature measurement sensors in the infrared thermometer is further corrected according to the linear regression equation.
The invention has the beneficial effects that: the infrared thermometer calibration device has the advantages of reasonable and ingenious structural design, high stability and high precision, and when the infrared thermometer is calibrated, the temperature calibration of the infrared thermometer can be implemented only by aligning the infrared thermometer to the blackbody cavity, so that the infrared thermometer calibration device is convenient to use; the problem that the blackbody temperature field is damaged and cannot be used continuously due to icing crystal caused by long-time use can be solved; compared with a nitrogen filling mode, the method has the advantages that resource waste is avoided, the use cost is lower, and the automatic intelligent manufacturing of the infrared thermometer is facilitated; in addition, the hollow cylindrical portion and the hollow tapered portion are provided so that the infrared rays of the infrared thermometer can be emitted to the inner side of the tapered top portion of the hollow tapered portion, thereby further increasing the calibration accuracy of the infrared thermometer. Moreover, the calibration method of the invention obtains high-precision calibration through fewer calibration points, reduces the calibration cost, improves the calibration efficiency and is beneficial to production automation.
The invention is further described with reference to the following detailed description and accompanying drawings.
Drawings
FIG. 1 is a schematic structural diagram of a negative temperature calibration apparatus of an infrared thermometer according to an embodiment of the present invention;
FIG. 2 is a top view of an apparatus for negative temperature calibration of an infrared thermometer in an embodiment of the present invention;
FIG. 3 is an emittance validation data table in an embodiment of the present invention;
FIG. 4 is a table of actual and measured temperatures (x) and error temperatures (y) in accordance with an embodiment of the present invention;
FIG. 5 is a plot of the error temperature (y) versus the measured temperature (x) for an embodiment of the present invention;
fig. 6 is a calibration verification table in an embodiment of the present invention.
Fig. 7 is a schematic structural diagram of a negative temperature calibration device and a stirring vane of an infrared thermometer in an embodiment of the present invention.
Detailed Description
In an embodiment, referring to fig. 1 to fig. 7, the negative temperature calibration device for an infrared thermometer provided in this embodiment includes: a constant temperature alcohol tank 1 and a blackbody cavity device arranged corresponding to the constant temperature alcohol tank 1; the blackbody cavity device comprises a blackbody cavity 21 arranged in the constant-temperature alcohol bath 1 and an alcohol bath panel 22 connected with the open end of the blackbody cavity 21; the constant-temperature alcohol tank 1 is provided with a panel bayonet, and the alcohol tank panel 22 is clamped on the constant-temperature alcohol tank 1 corresponding to the panel bayonet.
Specifically, under standard air pressure, the lowest freezing point of alcohol is-117 ℃, and the constant temperature is ensured by the constant temperature alcohol tank 1 by utilizing the characteristic of low freezing point; the temperature of the blackbody cavity 21 is consistent with the constant temperature of the constant temperature alcohol bath 1 through heat transfer, and therefore when the infrared thermometer is calibrated, the temperature calibration of the infrared thermometer can be implemented only by aligning the infrared thermometer with the blackbody cavity 21; in addition, because the alcohol cannot be solidified and frozen at the temperature of-50 ℃ to 0 ℃, the long-time calibration of the infrared thermometer becomes possible, and the problem that the blackbody temperature field is damaged and cannot be used continuously due to frozen crystals caused by long-time use is solved; compared with a nitrogen filling mode, the method has the advantages that resource waste is avoided, the use cost is lower, and the development process of automatic intelligent manufacturing of the infrared thermometer is further promoted.
Further, the constant temperature alcohol tank 1 is used for containing industrial environment-friendly alcohol 5, and production cost is further reduced.
The blackbody cavity 21 comprises a hollow cylindrical portion; the upper end of the hollow cylindrical part is provided with a ray inlet, and the lower end of the hollow cylindrical part extends downwards to form a hollow conical part; and black paint layers are arranged on the inner wall surfaces of the hollow cylindrical part and the hollow conical part.
Specifically, the hollow cylindrical part is arranged according to the ray circuit of the infrared thermometer; because the blackbody cavity 21 is arranged in the constant-temperature alcohol tank 1, the arrangement of the hollow cylindrical part can enable the position into which infrared rays of the infrared thermometer can be emitted to be deeper, namely the infrared thermometer can detect the temperature closer to the middle part of the constant-temperature alcohol tank 1, so that the calibration is more accurate; however, since heat transfer is inevitable, temperature fluctuation of the wall surface of the alcohol warming bath cannot be completely eliminated even though the heat transfer coefficient of the thermostatic alcohol bath 1 is small, and therefore, the problem is effectively solved by the arrangement of the hollow cylindrical portion, and the calibration accuracy is improved.
In addition, the lower end of the hollow cylindrical part extends downwards to form a hollow conical part, so that infrared rays of the infrared thermometer can be emitted to the inner side of the conical top of the hollow conical part, the periphery of the hollow conical part is directly contacted with alcohol in the constant-temperature alcohol tank 1, namely, the temperature transfer is faster, and the calibration precision of the infrared thermometer is further improved.
Further, the conical top of the hollow conical part extends to the longitudinal center plane of the thermostatic alcohol bath 1.
A sealing gasket 3 is further arranged at the joint of the hollow cylindrical part and the alcohol tank panel 22; the hollow cylindrical part, the sealing washer 3 and the alcohol tank panel 22 are fixedly connected in sequence.
Specifically, seal ring 3 is placed and will pass through screw 4 at cavity barrel portion up end alcohol groove panel 22 with cavity barrel portion lock is died, when needing to add alcohol promptly or when changing blackbody cavity 21, only needs to take out alcohol groove panel 22 and can separate blackbody cavity 21 and constant temperature alcohol bath 1. Wherein, seal ring 3 has still played the bradyseism, has kept stability, thermal-insulated effect.
Specifically, the hollow cylindrical part and the hollow conical part are both made of a metal with excellent heat conduction uniformity, specifically brass H90; ensuring a more uniform temperature distribution of the blackbody cavity 21.
The alcohol tank panel 22 is also provided with a heat insulation baffle plate 23 corresponding to the hollow column part; and a ray through hole is arranged through the upper end surface and the lower end surface of the heat insulation baffle plate 23 corresponding to the ray inlet.
Specifically, the heat insulation baffle 23 is arranged to effectively isolate the blackbody cavity 21 from external heat transfer, and ensure the accuracy of temperature calibration.
The constant-temperature alcohol tank 1 comprises a hollow heat insulation tank body, a stirring blade and a magnetic pump for driving the stirring blade to rotate; the stirring blade is arranged inside the heat insulation groove body, and the panel bayonet is arranged at the top end of the heat insulation groove body.
Specifically, the stirring blades are driven to rotate through the magnetic pump, so that the alcohol in the constant-temperature alcohol tank 1 is driven to flow, the temperature of the alcohol is uniformly distributed, and the precision of temperature calibration is also improved.
Further, in this embodiment, the stirring blade 6 includes a driving portion movably mounted on the inner side of the bottom end of the heat insulation tank and a stirring sheet fixedly connected to the driving portion; the outer end of the stirring sheet is close to the inner side wall surface of the heat insulation groove body; and the stirring sheet is provided with a rising inclined surface which inclines outwards from bottom to top corresponding to the driving part. Because of the alcohol of heat-insulating tank internal wall face department for heat-insulating tank body inside center change with external heat transfer that takes place, press close to through the outer end of stirring piece the setting of the interior lateral wall face of heat-insulating tank body for the temperature of alcohol is more even, follows the ascending inclined plane of up outwards slope in addition from down, makes alcohol form the whirl that rises when the stirring, further makes the temperature distribution of alcohol even.
Further, the heat insulation tank body is a high-precision low-temperature constant-temperature alcohol tank 1, and the model number of the heat insulation tank body is CYDC-0515; the high-precision dynamic constant temperature control technology is adopted, and the alcohol in the heat insulation tank body can be kept at a constant temperature consistent with a set temperature through refrigeration of a totally-enclosed compressor.
A low-temperature section calibration method of the infrared thermometer implemented according to the negative temperature calibration device of the infrared thermometer comprises the following steps:
aligning an infrared thermometer to a ray inlet, and acquiring the measured temperatures of a plurality of groups of constant-temperature alcohol tanks 1 at different actual temperatures;
calculating error temperature data according to the measured temperature data and the actual temperature data of the constant temperature alcohol bath 1;
fitting the error temperature data and the measured temperature data to obtain a fitting equation of the error temperature and the measured temperature;
selecting an actual temperature as a calibration point temperature according to the fitting curve;
setting the constant temperature of the constant-temperature alcohol bath 1 as the temperature of the calibration point, aligning the infrared tester to the ray inlet again, and collecting the calibration measurement temperature;
and calculating the compensation temperature according to the calibration measurement temperature, and adding the calibration measurement temperature and the compensation temperature to obtain the target temperature. Wherein the target temperature is a calibrated temperature.
After the temperature of the calibration point is selected, the temperature of the calibration point is subtracted by the corresponding measured temperature and then divided by the error temperature to obtain the calibration parameter.
When calculating the compensation temperature according to the calibration measurement temperature, the method further comprises the following steps:
the compensation temperature is calculated from the measured temperature by fitting an equation in combination with the calibration parameters.
Before the infrared tester is aligned with the ray inlet, alcohol with a set amount is added into the constant-temperature alcohol tank 1, and the magnetic pump is started to drive the stirring blades to rotate continuously.
And after the target temperature is obtained, a linear regression equation is calculated according to the target temperature, and the fitting difference of the infrared temperature measurement sensors in the infrared thermometer is further corrected according to the linear regression equation.
Further, before calibration, the emissivity of the blackbody cavity 21 needs to be detected by an emissivity measuring instrument, the emissivity is determined according to an emissivity verification data table shown in fig. 3, and if the emissivity does not reach the standard, the blackbody cavity 21 needs to be replaced, so that the calibration precision is ensured.
When the standard emissivity reaches 0.99-1.0, the emissivity is judged to reach the standard, and the purpose of judging whether the emissivity reaches the standard is to judge the capability of the surface of the material for radiation and heat transfer. The greater the emissivity value, the greater the ability to exchange heat with ambient radiation.
When the low-temperature section of the infrared thermometer is calibrated, firstly adding alcohol with a set amount into the constant-temperature alcohol tank 1, starting the magnetic pump to drive the stirring blades to stir continuously, aligning the infrared thermometer to the ray inlet, because the invention is mainly used for the calibration of the low temperature section of 0 to 50 ℃, the internal alcohol temperature is adjusted to be 0 ℃, 5 ℃, 10 ℃, 15 ℃, 20 ℃, 25 ℃, 30 ℃, 35 ℃, 40 ℃, 45 ℃ and 50 ℃ by a controller of the high-precision low-temperature constant-temperature alcohol tank 1 (namely a heat insulation tank body) at intervals of every 5 ℃, the method is recorded as an actual temperature, and comprises the steps of collecting measured temperatures x0, x1, x2, x3, x4, x5, x6, x7, x8, x9, x10 and x11 of a plurality of groups of constant-temperature alcohol tanks 1 at different actual temperatures; calculating error temperature data according to the measured temperature data and the actual temperature data of the constant temperature alcohol bath 1, and recording the error temperature data as y0, y1, y2, y3, y4, y5, y6, y7, y8, y9, y10 and y 11; recording the data into a data table of actual temperature, measured temperature (x) and error temperature (y), as shown in figure 4;
fitting the error temperature data and the measured temperature data, and establishing a fitting curve of the error temperature (y) and the measured temperature (x), as shown in fig. 5; and then obtaining a fitting equation of the error temperature and the measured temperature by the fitting curve: y-0.0026 x2-0.0725x +4.0841
Selecting an actual temperature as a calibration point temperature according to the fitted curve, wherein the temperature of the selected calibration point in the embodiment is-20 ℃; setting the constant temperature of the constant-temperature alcohol bath 1 as the temperature of the calibration point (namely-20 ℃), aligning the infrared tester to the ray inlet again, and collecting the calibration measurement temperature;
after the temperature of the calibration point is collected, subtracting the corresponding measurement temperature (x) from the temperature of the calibration point, and dividing the temperature by the error temperature (y) to obtain a calibration parameter K, wherein the calibration parameter equation is as follows: k ((-20) -x4)/y4, substituting x4 to 24.2 into the fitting equation to calculate y4 to 4.3159, and substituting x4 and y4 into the calibration parameter equation to calculate the calibration parameter K to 0.97;
calculating a compensation temperature (Tcomp) according to the calibration measurement temperature, wherein the Tcomp is (-0.0026x2-0.0725x +4.0841) xK and is substituted into the measurement temperature (x) corresponding to the temperature of the calibration point, or the infrared tester is aligned to the ray inlet again to collect the calibration measurement temperature which is theoretically the same as the measurement temperature (x), so that the accidental phenomenon caused by one-time collection can be avoided by collecting again, the calibration accuracy of the low-temperature section of the infrared thermometer is improved, and the infrared thermometer is detected to the measurement temperature to be readjusted during calibration, so that the operation is not complicated;
and finally, the measured temperature is calibrated and the compensation temperature is added to obtain a target temperature (Tobj), a linear regression equation is calculated according to the target temperature (Tobj), and the fitting difference of the infrared temperature measurement sensors in the infrared thermometer is further corrected according to the linear regression equation. And finishing the calibration of the low-temperature section of the infrared thermometer.
Finally, the actual temperature, the measured temperature (x) or the calibration measured temperature, the compensation temperature (Tcomp) and the target temperature (Tobj) are counted into a calibration verification table, as shown in fig. 6; it can be seen from the table that the errors of the final target temperatures (Tobj) are within + -1 deg.C, and even if the errors are large, the reasons can be found immediately according to the table and corrected.
It should be noted here that the principle of selecting the temperature of the calibration point is to select not less than 5 calibration points with uniform lower limit and upper limit, and select the 10%, 30%, 50%, 80%, and 100% of the measurement range respectively.
The calibration of the low temperature section of the infrared thermometer is carried out by the method, so that the precision of the infrared thermometer from minus 50 ℃ to 0 ℃ can be guaranteed to be within +/-1 ℃ during batch production. The high-precision calibration is obtained through fewer calibration points, the calibration cost is reduced, the calibration efficiency is improved, and the production automation is facilitated.
The infrared thermometer calibration device has the advantages of reasonable and ingenious structural design, high stability and high precision, when the infrared thermometer is calibrated, the temperature calibration of the infrared thermometer can be implemented only by aligning the infrared thermometer to the blackbody cavity 21, and the use is convenient; the problem that the blackbody temperature field is damaged and cannot be used continuously due to icing crystal caused by long-time use can be solved; compared with a nitrogen filling mode, the method has the advantages that resource waste is avoided, the use cost is lower, and the automatic intelligent manufacturing of the infrared thermometer is facilitated; in addition, the hollow cylindrical portion and the hollow tapered portion are provided so that the infrared rays of the infrared thermometer can be emitted to the inner side of the tapered top portion of the hollow tapered portion, thereby further increasing the calibration accuracy of the infrared thermometer. Moreover, the calibration method of the invention obtains high-precision calibration through fewer calibration points, reduces the calibration cost, improves the calibration efficiency and is beneficial to production automation.
The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner. Those skilled in the art can make many possible variations and modifications to the invention using the above disclosed technical means and teachings, or can modify equivalent embodiments with equivalent variations, without departing from the scope of the invention. Therefore, all equivalent changes made according to the shape, structure and principle of the present invention without departing from the technical scheme of the present invention shall be covered by the protection scope of the present invention.
Claims (3)
1. A low-temperature section calibration method of an infrared thermometer implemented according to a negative temperature calibration device of the infrared thermometer, the negative temperature calibration device of the infrared thermometer comprises the following steps: constant temperature alcohol bath and the black body cavity device that should set up in the constant temperature alcohol bath, black body cavity device is including arranging the black body cavity in this constant temperature alcohol bath in to and the alcohol trough panel of being connected with the open end of this black body cavity, be equipped with the panel bayonet socket on the constant temperature alcohol bath, the alcohol trough panel is arranged in to panel bayonet socket card on the constant temperature alcohol bath, the constant temperature alcohol bath includes hollow thermal-insulated cell body, stirring leaf and is used for ordering about this stirring leaf pivoted magnetic pump, and this stirring leaf sets up inside the thermal-insulated cell body, the panel bayonet socket sets up the top at this thermal-insulated cell body, a serial communication port, infrared thermometer low temperature section calibration method includes:
aligning an infrared thermometer to a ray inlet, and acquiring the measured temperatures of a plurality of groups of constant-temperature alcohol tanks at different actual temperatures;
calculating error temperature data according to the measured temperature data and the actual temperature data of the constant-temperature alcohol tank;
fitting the error temperature data and the measured temperature data to obtain a fitting equation of the error temperature and the measured temperature;
selecting an actual temperature as a calibration point temperature according to the fitting curve;
setting the constant temperature of the constant-temperature alcohol tank as the temperature of the calibration point, aligning the infrared tester to the ray inlet again, and collecting the calibration measurement temperature;
substituting the calibration measurement temperature into the fitting equation to calculate an error temperature corresponding to the calibration measurement temperature, and dividing the error temperature corresponding to the calibration measurement temperature by the temperature of the calibration point after subtracting the calibration measurement temperature to obtain a calibration parameter;
and multiplying the error temperature corresponding to the calibration measurement temperature by the calibration parameter to calculate a compensation temperature, and adding the calibration measurement temperature and the compensation temperature to obtain a target temperature.
2. The method for calibrating the low temperature section of the infrared thermometer according to claim 1, wherein a set amount of alcohol is added into the constant temperature alcohol bath before the infrared thermometer is aligned with the ray inlet, and the magnetic pump is started to drive the stirring blade to rotate continuously.
3. The method according to claim 1, wherein after the target temperature is obtained, a linear regression equation is calculated according to the target temperature, and the fitting difference of the infrared thermometers in the infrared thermometers is further corrected according to the linear regression equation.
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