CN102538958B - High-absorptivity radiation absorption chamber - Google Patents
High-absorptivity radiation absorption chamber Download PDFInfo
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- CN102538958B CN102538958B CN 201110439109 CN201110439109A CN102538958B CN 102538958 B CN102538958 B CN 102538958B CN 201110439109 CN201110439109 CN 201110439109 CN 201110439109 A CN201110439109 A CN 201110439109A CN 102538958 B CN102538958 B CN 102538958B
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Abstract
A high-absorptivity radiation absorption chamber relates to the field of optical radiation measurement and solves the problem that the existing absorption chamber is high in absorptivity attenuation and low in absorptivity when used in a space environment. The high-absorptivity radiation absorption chamber comprises a chamber incidence bore, a regular conical surface and an inclined bottom surface which forms an included angle beta with a generatrix of a cone, wherein the chamber incidence bore is positioned at the small end of the cone, a plane of the incidence bore is perpendicular to an axis of the cone, the inner wall of the absorption chamber is coated with a pure mirror reflection black coating, and beta is 30 degrees. The high-absorptivity radiation absorption chamber not only is applicable to ground low-temperature radiation measurement, but also is more highly applicable to special spatial environments. The high-absorptivity radiation absorption chamber is stable and has highabsorptivity (approximately 1).
Description
Technical field
The present invention relates to the optical radiation measurement field, be specifically related to a kind of high-absorbility radiation absorbing cavity.
Background technology
At present, the shape of absorbing cavity has multiple absorbing cavity types such as cylindrical, normal cone shape and combined shaped.Immediate with the present invention is the absorbing cavity that Britain's National Physical Laboratory (NPL) uses in the low temperature absolute radiometer of ground, its structure as shown in Figure 1, be that inclined end face 2 and the chamber incident bore 3 of β formed by cylindrical sides 1, inclination angle mainly, Prokhorov had once carried out careful research in depth to this cavity body structure, when 3 one timings of chamber incident bore, the length of increase cylindrical sides 1 can obtain the absorptivity near 1 (0.99999).
Set up the low temperature absolute radiometer in space, purpose is the magnitude of absolute precision raising with current spatial light radiant quantity.If the band inclined end face cylindrical cavity that ground is used can run into following difficulty for space environment: the chamber is in use for some time owing to be subjected to the influence of space cosmic rays, space particle, the absorptivity decay that is coated with black-materials in the radiation absorbing cavity is serious, significant change can take place because of the decay that inwall is coated with the black-materials absorptivity in the absorptivity in chamber, introduces than mistake to measurement result.
How to improve the absorbing cavity type, to remedy by being coated with the error that the decay of black-materials absorptivity is introduced as far as possible, finally obtain stable performance in space, absorptivity is the problem that needs solution at present near 1 radiation absorbing cavity.
Summary of the invention
Absorptivity decayed seriously when the present invention used in space environment for solving existing absorbing cavity, and the problem that absorptivity is low provides a kind of high-absorbility radiation absorbing cavity.
A kind of high-absorbility radiation absorbing cavity, comprise chamber incident bore, normal cone face and with the element of cone angle be the inclined end face of β, chamber incident bore is positioned at the thin end of cone, and the axis normal of plane, incident bore place and cone; The cavity wall of absorbing cavity scribbles the black coating of pure minute surface reflection, and the angle value of described β is 30 °.
Beneficial effect of the present invention: absorbing cavity type of the present invention, when a branch of light is incident to the chamber wall along path of the present invention, circular conical surface can increase surperficial order of reflection or effectively with the light of directive outlet inside, reflected back chamber again, be conducive to obtain higher absorptivity, the energy loss of direct retroeflection when having reduced light along cavity axis incident simultaneously.Stable radiation absorbing cavity of the present invention can obtain high-absorbility (near 1) under the particular surroundings in space.
Description of drawings
Fig. 1 is the structural representation of existing radiation absorbing cavity;
Fig. 2 is the structural representation of a kind of high-absorbility radiation absorbing cavity of the present invention;
Fig. 3 is existing absorbing cavity and absorbing cavity principle of work comparison diagram of the present invention.
Among the figure: 1, cylindrical sides, 2, the inclination angle is the inclined end face of β, 3, chamber incident bore, 4, the normal cone face, 5, with the element of cone angle be the inclined end face of β, 6, cone, 7, the black coating of pure minute surface reflection.
Embodiment
In conjunction with Fig. 1 and Fig. 2 present embodiment is described, a kind of high-absorbility radiation absorbing cavity comprises normal cone face 4, with the element of cone angle be the inclined end face 5 of β; The axis normal of chamber incident bore plane, 3 place and cone 6 (the circular cone drift angle is α); Whole cavity material adopts the OFHC copper that thermal property is good at low temperatures, and inwall adopts the black coating 7 of pure minute surface reflection, and the angle value of described β is 30 °.
The cavity material of the described absorbing cavity of present embodiment is selected well behaved OFHC copper under the low temperature, and it is black that inwall is coated with pure minute surface reflection.Concrete process is:
One, make the circular cone side: at first adopting chemical plating process to make drift angle is the normal cone shape chamber of α, cuts in the thin end-grain cutting of normal cone, obtains chamber incident bore 3, and guarantees that cut surface is vertical with the axle of circular cone; Obtain a dip plane (inclined end face) in other end cutting, the angle of this dip plane and element of cone is β; Spray the black coating 7 of pure minute surface reflection at last at inwall; For described inclined end face, by MAT LAB draw inclined end face 5 shape and calculate area, make suitable inclined end face according to result of calculation, and spray the black coating 7 of pure minute surface reflection.
Two, be integrated through circular conical surface bonding and above-mentioned cutting, form the structure of absorbing cavity.
Be described further in conjunction with the present embodiment of Fig. 3, adopt the Monte-Carlo method that cylindrical cavity and the conical cavity of band inclined end face are carried out the analog computation of number of specular reflections, two kinds of chambeies of hypothesis have identical bore R=1, equal length H=8 and identical inclined end face angle of inclination beta=30 ° before calculating.Incident ray incides absorbing cavity along the z direction of principal axis, penetrates through N secondary mirror reflection back in the chamber.Draw from result of calculation: the average vertical number of specular reflections of band inclined end face cylindrical cavity is substantially in 5-10 time scope, and for being with the inclined end face conical cavity, the average vertical number of specular reflections is substantially more than 10 times.If it is 0.9 that cavity wall is coated with the absorptivity of black-materials itself, the vertical effectively absorptivity that both provide is all more than 0.99999; When cavity wall blacking absorptivity was 0.8, the former vertical effective absorptivity was in the 0.99968-0.99999 scope, and the latter remains on 0.99999 substantially; When inwall blacking absorptivity was 0.7, the effective absorptivity of the former minimum vertical had been reduced to 0.99757, and the latter remains 0.99999.This shows that band inclined end face conical cavity of the present invention when using, had both made the absorptivity of cavity wall blacking decay in space, also can not produce obviously influence to the absorptivity in chamber.When light beam in as Fig. 3 during the wall of directive chamber, the described path of a part, after cylindrical side is through a few secondary mirror reflections, will inevitably penetrate cavity, but light beam can increase surperficial order of reflection effectively or with the light of directive outlet inside, reflected back chamber again, be conducive to obtain higher absorptivity when the described path of b part.
Claims (1)
1. high-absorbility radiation absorbing cavity, it is characterized in that, this absorbing cavity comprise chamber incident bore (3), normal cone face (4) and with the element of cone angle be the inclined end face (5) of β, chamber incident bore (3) is positioned at the thin end of cone (6), and the axis normal of incident bore (3) plane, place and cone (6); The absorbing cavity inwall scribbles the black coating (7) of pure minute surface reflection, and the angle value of described β is 30 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110439109 CN102538958B (en) | 2011-12-23 | 2011-12-23 | High-absorptivity radiation absorption chamber |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201110439109 CN102538958B (en) | 2011-12-23 | 2011-12-23 | High-absorptivity radiation absorption chamber |
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| CN102538958A CN102538958A (en) | 2012-07-04 |
| CN102538958B true CN102538958B (en) | 2013-09-25 |
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| CN 201110439109 Expired - Fee Related CN102538958B (en) | 2011-12-23 | 2011-12-23 | High-absorptivity radiation absorption chamber |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106768372B (en) * | 2016-11-14 | 2019-04-30 | 中国电子科技集团公司第四十一研究所 | A kind of low temperature radiometer blackbody chamber |
| CN110927841A (en) * | 2019-12-10 | 2020-03-27 | 中国计量科学研究院 | Optical trap |
| CN111983736B (en) * | 2020-07-08 | 2022-12-13 | 中国科学院上海硅酸盐研究所 | Visible-near infrared light wave band absorber |
| CN113686428B (en) * | 2021-08-27 | 2024-07-09 | 西安应用光学研究所 | Absorption cavity of low-temperature radiometer |
| CN114593831B (en) * | 2022-02-28 | 2024-07-30 | 中国电子科技集团公司第四十一研究所 | Optical radiation absorbing device for vacuum ultraviolet low-temperature radiometer |
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| JPH0624453B2 (en) * | 1988-09-14 | 1994-04-06 | 三洋化成工業株式会社 | Soil water retention agent and water retention method |
| CN100552396C (en) * | 2008-03-18 | 2009-10-21 | 中国科学院长春光学精密机械与物理研究所 | Absorbed radiation composite diamond heat-exchanging diaphragm and preparation method thereof |
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