CN211553073U - Infrared radiation thermometer negative temperature calibrating device - Google Patents
Infrared radiation thermometer negative temperature calibrating device Download PDFInfo
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- CN211553073U CN211553073U CN202020092156.8U CN202020092156U CN211553073U CN 211553073 U CN211553073 U CN 211553073U CN 202020092156 U CN202020092156 U CN 202020092156U CN 211553073 U CN211553073 U CN 211553073U
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Abstract
The utility model discloses an infrared radiation thermometer negative temperature calibrating device, include: 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 utility model also discloses a method for calibrating the low temperature section of the infrared thermometer; the utility model has 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 with the black body cavity, 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 of no resource waste and lower use cost.
Description
Technical Field
The utility model relates to an outer thermoscope production field, concretely relates to infrared thermoscope negative temperature calibrating device.
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.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem, the utility model discloses an infrared radiation thermometer negative temperature calibrating device.
The utility model discloses a realize that the technical scheme that above-mentioned purpose adopted is:
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; 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.
The black body cavity device comprises an alcohol tank panel connected with the open end of the black body 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 conical top end of the hollow conical part extends to the longitudinal central plane of the constant temperature alcohol bath.
The sealing washer is placed on the upper end face of the hollow cylindrical body and fixedly connected with the alcohol tank panel through screws.
The stirring blade comprises a driving part movably arranged on the inner side of the bottom end of the heat insulation groove body and a stirring sheet fixedly connected with the driving part; 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.
The hollow cylindrical part and the hollow conical part are both brass H90 members.
The utility model has the advantages that: the utility model has 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 with the black body cavity, 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.
The present invention will be further described with reference to the accompanying drawings and the following detailed description.
Drawings
Fig. 1 is a schematic structural diagram of a negative temperature calibration device of an infrared thermometer in an embodiment of the present invention;
fig. 2 is a top view of an infrared thermometer negative temperature calibration device in an embodiment of the present invention;
fig. 3 is an emissivity validation data table in an embodiment of the invention;
FIG. 4 is a data table of actual temperature, measured temperature (x) and error temperature (y) in an embodiment of the present invention;
FIG. 5 is a fitting curve of the error temperature (y) and the measured temperature (x) in an embodiment of the present invention;
fig. 6 is a calibration verification table in an embodiment of the present invention.
Detailed Description
In an embodiment, referring to fig. 1 to fig. 6, 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 end of the hollow conical part extends to the longitudinal central 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 6 and a magnetic pump for driving the stirring blade 6 to rotate; the stirring blade 6 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, drive stirring leaf 6 through the magnetic drive pump and rotate, and then drive the interior alcohol of constant temperature alcohol bath 1 and flow, make the temperature distribution of alcohol even, also improved the precision of temperature calibration.
Further, the stirring blade 6 comprises a driving part movably mounted on the inner side of the bottom end of the heat insulation tank body and a stirring sheet fixedly connected with the driving part; 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 blade 6 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 to infrared thermometer is calibrated, add the alcohol of set volume earlier in constant temperature alcohol bath 1, start the magnetic drive pump and drive stirring leaf 6 and stir continuously, infrared thermometer aims at the ray entry, because the utility model discloses mainly used is 0 to the calibration of-50 degree low temperature section, so according to every 5 degrees intervals, loop through the controller of high accuracy low temperature constant temperature alcohol bath 1 (be thermal-insulated cell body) and adjust its inside alcohol temperature and be 0 ℃, -5 ℃, -10 ℃, -15 ℃, -20 ℃, -25 ℃, -30 ℃, -35 ℃, -40 ℃, -45 ℃, -50 ℃, its record is actual temperature, and by gathering several groups constant temperature alcohol bath 1 measuring temperature x0, x1, x2, x3, x4, x5, x6, x7, x8, x9, x10, x 11; 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 utility model has 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 black body 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. Furthermore, the utility model discloses a calibration method obtains the calibration of high accuracy through less calibration point, has reduced the calibration cost, improves calibration efficiency, does benefit to production automation.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention in any way. The technical solution of the present invention can be used by anyone skilled in the art to make many possible variations and modifications, or to modify equivalent embodiments, using the technical means and contents disclosed above, without departing from the scope of the technical solution of the present invention. Therefore, the equivalent changes made according to the shape, structure and principle of the present invention should be covered in the protection scope of the present invention.
Claims (10)
1. The utility model provides an infrared thermometer negative temperature calibrating device which characterized in that includes: 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;
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.
2. The infrared thermometer negative temperature calibration device of claim 1, wherein said hohlraum device further comprises an alcohol trough panel connected to an open end of said hohlraum;
the panel bayonet is arranged on the constant-temperature alcohol tank, and the alcohol tank panel is clamped on the constant-temperature alcohol tank corresponding to the panel bayonet.
3. The infrared thermometer negative temperature calibration device of claim 2, wherein 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.
4. The negative temperature calibration device of claim 3, wherein a sealing gasket is further 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.
5. The negative temperature calibration device of claim 4, wherein the alcohol trough panel is further provided with a heat insulation baffle corresponding to the hollow cylindrical 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.
6. The infrared thermometer negative temperature calibration device as set forth in claim 3, wherein the tapered tip of the hollow tapered portion extends to a longitudinal center plane of the thermostatic alcohol bath.
7. The negative temperature calibration device of claim 4, wherein the sealing washer is placed on the upper end face of the hollow cylindrical body to fixedly connect the alcohol tank panel with the hollow cylindrical body through a screw.
8. The negative temperature calibration device of the infrared thermometer according to claim 1, wherein the stirring blade comprises a driving part movably mounted on the inner side of the bottom end of the heat insulation tank body and a stirring sheet fixedly connected with the driving part;
the outer end of the stirring sheet is close to the inner side wall surface of the heat insulation groove body.
9. The negative temperature calibration device according to claim 8, wherein the stirring plate has an ascending slope that inclines outward from bottom to top in correspondence with the driving portion.
10. The infrared thermometer negative temperature calibration device as set forth in claim 6, wherein said hollow cylindrical portion and said hollow conical portion are each brass H90 members.
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| CN202020092156.8U CN211553073U (en) | 2020-01-16 | 2020-01-16 | Infrared radiation thermometer negative temperature calibrating device |
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| CN202020092156.8U CN211553073U (en) | 2020-01-16 | 2020-01-16 | Infrared radiation thermometer negative temperature calibrating device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111207834A (en) * | 2020-01-16 | 2020-05-29 | 优利德科技(中国)股份有限公司 | Infrared thermometer negative temperature calibration device and calibration method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111207834A (en) * | 2020-01-16 | 2020-05-29 | 优利德科技(中国)股份有限公司 | Infrared thermometer negative temperature calibration device and calibration method |
| CN111207834B (en) * | 2020-01-16 | 2022-02-08 | 优利德科技(中国)股份有限公司 | Infrared thermometer negative temperature calibration device and calibration method |
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