CN202947796U - Three-cavity black-body radiation source for emissivity measurement - Google Patents
Three-cavity black-body radiation source for emissivity measurement Download PDFInfo
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- CN202947796U CN202947796U CN 201220436689 CN201220436689U CN202947796U CN 202947796 U CN202947796 U CN 202947796U CN 201220436689 CN201220436689 CN 201220436689 CN 201220436689 U CN201220436689 U CN 201220436689U CN 202947796 U CN202947796 U CN 202947796U
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Abstract
Disclosed in the utility model is a three-cavity black-body radiation source for emissivity measurement. The three-cavity black-body radiation source comprises a liquid thermostat, black-body cavity casings, a temperature control apparatus and a standard thermometer, wherein liquid mediums are arranged inside the liquid thermostat. There are three black-body cavity casings that are formed by conical cavities at the front ends and cylindrical cavities at the rear ends; and coatings with high-emissivity paintings are coated on the inner walls of the black-body cavity casings. The black-body cavity casings as well as three grooves with conical front ends and cylindrical rear ends is arranged inside the liquid thermostat, wherein the three grooves with the same size are arranged at an equal interval; and the three black-body cavity casings are respectively arranged in the grooves having the shapes identical with those of the black-body cavity casing. And the outer side of the liquid thermostat is fixedly connected with outer cylindrical surfaces of three opened cylindrical cavity; and the standard thermometer is arranged in the liquid thermostat. According to the utility model, the black-body cavities are arranged, so that the emissivity of three different to-be-measured samples can be measured simultaneously; and real-time comparison can be carried out on data of a to-be-measure sample, a standard sample and a standard radiation source. Besides, the black-body cavities can be dismounted, so that samples can be placed conveniently.
Description
Technical field
The utility model relates to a kind of emissivity measurement device, especially relates to a kind of three chamber blackbody radiation sources for emissivity measurement.
Background technology
Emissivity is one of important evidence of weighing the heat radiator radiant power, and studying and measure the object emissivity for the thermal radiation property that discloses material, raising radiation heating efficient and seeking energy-conservation new way has important realistic meaning.In the national defence field, to the cognition of the emissivity of guided missile bright eruption, covering, be Military Early Warning, guidance and stealthy key.And target emissivity data acquisition is the basis of remote sensing, radiation temperature measurement, has directly determined the uncertainty of measuring.
Emissivity is the parameter of a very complex, and the temperature of material, wavelength, surface appearance, emission angle, polarization state etc. all can affect the measurement of emissivity.This has increased diversity and the difficulty of emissivity measurement greatly, and therefore, the emissivity of measuring accurately material is all significant to national defence industry and temperature correction.
The emissivity measurement method mainly comprises direct measuring, indirect measuring technology and hybrid measurement technology at present.Direct measuring is a kind of common, the most general method, and the direct measuring that uses blackbody radiation source to build is most widely used.Single chamber blackbody radiation source of use when measuring the material emissivity, can not be measured a plurality of testing samples simultaneously in the past, can not carry out the real time data comparison with standard model, testing sample, three groups of data of standard blackbody radiation source, had the problem of poor in timeliness.So it is very necessary developing a kind of three chamber blackbody radiation sources.
Summary of the invention
The purpose of this utility model is to provide a kind of three chamber blackbody radiation sources for emissivity measurement, and this three chambeies blackbody radiation source has improved measures the ageing of material emissivity.
The technical solution adopted in the utility model is:
the utility model comprises liquid thermostat, blackbody cavity shell, attemperating unit and the standard thermometer of built-in liquid medium, described blackbody cavity shell has three, be that conical cavity and rear end are that cylindrical cavity forms by front end, the inwall of three blackbody cavity shells all scribbles the coating of high emissivity coating, an end in liquid thermostat is equipped with attemperating unit, the other end in liquid thermostat is provided with three equidistant arrangements, identical and the front end of size be taper shape, the rear end is columniform groove, the taper shape of groove is towards attemperating unit one side, three blackbody cavity shells are placed in respectively the groove identical with blackbody cavity hull shape shape separately, the liquid thermostat lateral surface is affixed by the cylindrical cavity external cylindrical surface of web joint and three openings respectively, standard thermometer is placed in liquid thermostat.
Described cylindrical cavity diameter D is that D:L is 1:4～6 with the ratio of cylindrical cavity length L.
The emissivity of described blackbody cavity shell inwall high emissivity coating 〉=0.998.
The material of described groove is red copper.
The tapering of described cone-shaped groove and conical cavity is 120 degree.
Described liquid medium is solidifying point higher than-50 ℃ and the boiling point oil lower than 300 ℃.
The beneficial effect that the utlity model has is:
The utility model has increased blackbody cavity, makes this device can measure simultaneously the emissivity of three kinds of different testing samples; Also can compare in real time the data of testing sample, standard model, calibrated radiation source.Simultaneously, increased the stationary installation of blackbody cavity shell and liquid thermostat, made blackbody cavity be convenient to dismounting, be convenient to lay sample.
The key technical indexes of the present utility model:
A) temperature range :-50 ℃ ~ 300 ℃;
B) blackbody cavity emissivity: more than 0.998.
Description of drawings
Fig. 1 is structural representation of the present utility model.
Fig. 2 is three blackbody cavity shell left views of Fig. 1.
Fig. 3 is the utility model top plan view.
In figure: 1, liquid thermostat, 2, cylindrical cavity, 3, conical cavity, 4, the blackbody cavity shell, 5, groove, 6, standard thermometer, 7, screw, 8, temperature regulating device, 9, liquid medium.
Embodiment
The utility model is described in further detail below in conjunction with drawings and Examples.
Critical component of the present utility model is three equidistant blackbody cavity shells of arranging.In order to measure more accurately the emissivity of sample, the emissivity of blackbody cavity shell (comprising effective emissivity and integrated emissivity) must be close to 1.In view of this, taked following measure:
A) be designed to cylindrical cavity with conical lower portion.Add that conical cavity helps to increase the chance of the Multi reflection in the chamber, thereby improve the emissivity of cavity;
B) cylindrical cavity diameter D is that D:L is 1:4～6 with the ratio of cylindrical cavity length L.The ratio of analytical cavity diameter D and cavity length L between this, not only have high cavity emissivity, and reality also is convenient to calibration in theory.
C) blackbody cavity is made by aluminum alloy materials, and cavity inner wall scribbles the coating of high emissivity, and with the integrating sphere method, coating is carried out albedo measurement, and processing can improve the emissivity of blackbody cavity like this.
as Fig. 1, Fig. 2, shown in Figure 3, the utility model comprises liquid thermostat 1, blackbody cavity shell, attemperating unit 8 and the standard thermometer 6 of built-in liquid medium 9, described blackbody cavity shell 3 has three, be that conical cavity 3 and rear end are that cylindrical cavity 2 forms by front end, the inwall of three blackbody cavity shells 4 all scribbles the coating of high emissivity coating, an end in liquid thermostat 1 is equipped with attemperating unit 8, the other end in liquid thermostat 1 is provided with three equidistant arrangements, identical and the front end of size be taper shape, the rear end is columniform groove 5, the taper shape of groove 5 is towards attemperating unit 8 one sides, three blackbody cavity shells 4 are placed in respectively the groove 5 identical with blackbody cavity shell 4 shapes separately, liquid thermostat 1 lateral surface uses cylindrical cavity 2 external cylindrical surfaces of screw 7 and three openings affixed by web joint respectively, standard thermometer 6 is placed in liquid thermostat 1.
Described cylindrical cavity 2 diameter D are that D:L is 1:4～6 with the ratio of cylindrical cavity 2 length L.
The emissivity of described blackbody cavity shell 4 inwall high emissivity coating 〉=0.998.
The material of described groove 5 is red copper.
The tapering of described cone-shaped groove 5 and conical cavity 3 is 120 degree.
Described liquid medium 9 is solidifying point higher than-50 ℃ and the boiling point oil lower than 300 ℃.
Temperature regulating device 8 shown in Fig. 1 is used in respectively different temperature ranges for well heater and refrigerator.They are respectively more than environment temperature and following startup.The temperature control scope of temperature regulating device 8 is-50 ℃ ~ 300 ℃, and temperature-controlled precision is less than ± 0.1 ℃.
Standard thermometer 6 shown in Fig. 1 is that second-class standard platinum resistance thermometer WZPB-2(measures temperature range for-183 ~ 420 ℃) as standard thermometer, measure the temperature of liquid thermostat 1.Liquid medium 9 in liquid thermostat 1 is silicone oil.Blackbody cavity shell 4 use thickness shown in Fig. 1 are that the aluminum material of 5mm is made, blackbody cavity shell 4 is that 45mm length is that the cylindrical cavity 2 of 250mm and cone angle are that 120 degree, bottom surface internal diameter are that 30mm conical cavity 3 is welded by internal diameter, requires Concentricity tolerance less than 0.1mm;
The groove 5 employing thickness of the liquid thermostat 1 shown in Fig. 1 are that the red copper material of 5mm is made, and the internal diameter of columniform groove 5 is 50mm, and length is 250mm; The bottom surface internal diameter of conical groove 5 is 50mm, and cone angle is 120 degree.The cylindrical center distance of two adjacent notches 5 is 150mm.Form three grooves 5 of equidistantly arranging.The material that groove 5 adopts is red copper, and it has good thermal conductivity, has greatly improved the consistance of liquid medium 9 and blackbody cavity shell 4 temperature.
Blackbody cavity shell 4 shown in Fig. 1 is fixed in liquid thermostat 1 by screw 7.Turn on screw, blackbody cavity just can be extracted out from groove 5, is convenient to lay sample.
Utilize this device can adopt energy method to measure the emissivity of sample.The emissivity of material is to draw by the ratio of definite measured material with black matrix monochromatic degree of giving off at identical wavelength and temperature, namely
Be the monochromatic radiation out-degree of measured material,
Monochromatic radiation out-degree for black matrix.
By Planck law as can be known, the monochromatic radiation out-degree of black matrix is:
Bring into:
Following formula shows, in the temperature of known sample
, the blackbody radiation source temperature
And wavelength
Condition under just can obtain the material emissivity
, wherein
First radiation constant,
Second radiation constant.
Wavelength is at 10um, and the attemperating unit temperature control records the emissivity of brass, aluminium and three kinds of different samples of stainless steel as shown in Table 1 under 50 ℃ of conditions.
The emissivity of three kinds of different samples of table one the utility model actual measurement
| Title material | Emissivity |
| Brass | 0.21 |
| Aluminium | 0.15 |
| Stainless steel | 0.22 |
Claims (6)
1. three chamber blackbody radiation sources that are used for emissivity measurement comprise liquid thermostat (1), blackbody cavity shell (4), attemperating unit (8) and the standard thermometer (6) of built-in liquid medium (9), it is characterized in that: described blackbody cavity shell (4) has three, be that conical cavity (3) and rear end are that cylindrical cavity (2) forms by front end, the inwall of three blackbody cavity shells (4) all scribbles the coating of high emissivity coating, an end in liquid thermostat (1) is equipped with attemperating unit (8), the other end in liquid thermostat (1) is provided with three equidistant arrangements, identical and the front end of size be taper shape, the rear end is columniform groove (5), the taper shape of groove (5) is towards attemperating unit (8) one sides, three blackbody cavity shells (4) are placed in respectively the groove (5) identical with blackbody cavity shell (4) shape separately, liquid thermostat (1) lateral surface is affixed with screw (7) by cylindrical cavity (2) external cylindrical surface of web joint and three openings respectively, standard thermometer (6) is placed in liquid thermostat (1).
2. a kind of three chamber blackbody radiation sources for emissivity measurement according to claim 1, it is characterized in that: the ratio of described cylindrical cavity (2) diameter D and cylindrical cavity (2) length L is that D:L is 1:4～6.
3. a kind of three chamber blackbody radiation sources for emissivity measurement according to claim 1, is characterized in that: the emissivity of described blackbody cavity shell (4) inwall high emissivity coating 〉=0.998.
4. a kind of three chamber blackbody radiation sources for emissivity measurement according to claim 1, it is characterized in that: the material of described groove (5) is red copper.
5. a kind of three chamber blackbody radiation sources for emissivity measurement according to claim 1 is characterized in that: the tapering of described cone-shaped groove (5) and conical cavity (3) is 120 degree.
6. a kind of three chamber blackbody radiation sources for emissivity measurement according to claim 1 is characterized in that: described liquid medium (9) for solidifying point higher than-50 ℃ and the boiling point oil lower than 300 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220436689 CN202947796U (en) | 2012-08-30 | 2012-08-30 | Three-cavity black-body radiation source for emissivity measurement |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220436689 CN202947796U (en) | 2012-08-30 | 2012-08-30 | Three-cavity black-body radiation source for emissivity measurement |
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| CN202947796U true CN202947796U (en) | 2013-05-22 |
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| CN 201220436689 Expired - Fee Related CN202947796U (en) | 2012-08-30 | 2012-08-30 | Three-cavity black-body radiation source for emissivity measurement |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102829875A (en) * | 2012-08-30 | 2012-12-19 | 中国计量学院 | Three-cavity blackbody radiation source for measuring emissivity |
| CN104237133A (en) * | 2014-09-10 | 2014-12-24 | 北京环境特性研究所 | Determination method and determination device of normal emittance of pointed cone array plane black body |
| TWI674190B (en) * | 2018-01-11 | 2019-10-11 | 鴻海精密工業股份有限公司 | Blackbody Radiation Source and Preparation Method of Blackbody Radiation Source |
-
2012
- 2012-08-30 CN CN 201220436689 patent/CN202947796U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102829875A (en) * | 2012-08-30 | 2012-12-19 | 中国计量学院 | Three-cavity blackbody radiation source for measuring emissivity |
| CN104237133A (en) * | 2014-09-10 | 2014-12-24 | 北京环境特性研究所 | Determination method and determination device of normal emittance of pointed cone array plane black body |
| TWI674190B (en) * | 2018-01-11 | 2019-10-11 | 鴻海精密工業股份有限公司 | Blackbody Radiation Source and Preparation Method of Blackbody Radiation Source |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130522 Termination date: 20130830 |