CN108226100A - Improved cavity for point source transmittance test - Google Patents
Improved cavity for point source transmittance test Download PDFInfo
- Publication number
- CN108226100A CN108226100A CN201810036063.0A CN201810036063A CN108226100A CN 108226100 A CN108226100 A CN 108226100A CN 201810036063 A CN201810036063 A CN 201810036063A CN 108226100 A CN108226100 A CN 108226100A
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- light
- point source
- cavity
- transmission measurement
- source transmission
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- 238000012360 testing method Methods 0.000 title abstract description 22
- 238000002834 transmittance Methods 0.000 title abstract 2
- 230000005532 trapping Effects 0.000 claims description 39
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 13
- 230000005540 biological transmission Effects 0.000 claims description 13
- 238000005259 measurement Methods 0.000 claims description 13
- 239000004744 fabric Substances 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 4
- 238000003032 molecular docking Methods 0.000 claims description 4
- 230000003746 surface roughness Effects 0.000 claims description 3
- 238000000605 extraction Methods 0.000 claims description 2
- 230000003287 optical effect Effects 0.000 abstract description 9
- 210000001503 joint Anatomy 0.000 abstract 2
- 238000013459 approach Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000004313 glare Effects 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 210000001747 pupil Anatomy 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 238000002310 reflectometry Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008033 biological extinction Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000006748 scratching Methods 0.000 description 1
- 230000002393 scratching effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/59—Transmissivity
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
- Examining Or Testing Airtightness (AREA)
Abstract
The invention belongs to the field of stray light testing of an optical system, and relates to an improved testing cavity for testing the point source transmittance of the optical system. The device comprises a sealed cavity and a light trap arranged outside the sealed cavity; the side wall of the sealed cavity is formed by butting two curved surfaces with the cross sections being major arcs; an optical inlet is arranged at the butt joint of the two curved surfaces; the top and the bottom of the sealed cavity are sealed by a flat plate; the optical trap is positioned at the butt joint of the two curved surfaces opposite to the light inlet; the cross section of the light trap is isosceles trapezoid. The "spike" noise in the PST test results is eliminated.
Description
Technical field
The invention belongs to optical system Stray Light Test field, it is related to a kind of for optical system point source transmission measurement
Modified tests cavity.
Background technology
In PST test process, when parallel beam incident is to camera light inlet, the signal that is obtained on camera test surface in addition to
Inhibit the energy after attenuation by camera veiling glare itself, be also superimposed one layer and entered making an uproar for camera since other approach reflect
Acoustic energy, these approach include：(1) light source reflects caused by irradiating or scattering to laboratory wall and ground；(2) camera hides
Light shield outer wall caused secondary reflection after being irradiated by directional light；(3) it is scattered caused by air atom.Phase is entered by more than approach
We term it noises for the energy of machine, and for noise caused by approach (1) and (2), tested camera typically is placed on one solely
In vertical test chamber body, to shield the reflected light in external environment.As before the present inventor in patent 2017113524719 it is public
A kind of test cavity of twin columns jar structure has been opened, due to being limited by lab size, while has ensured the outer test environment of twin columns tank
Stabilization, the collimated light beam being incident in twin columns tank, other than entering the light beam in tested camera, remaining light must be double
It completes attenuation in column tank to absorb, therefore, in order to minimize stray light background radiation in twin columns tank, usually using a kind of section
For the light trapping of isosceles right triangle, light trapping inner-wall material is black acrylic, plays the work for absorbing incident directional light
With as shown in Figure 1, directional light enters light trapping after camera, at least through 5 secondary reflections ability backtracking, according to sub- gram
Power plate absorptivity calculates, and outgoing light energy is only 0.0000003 times of incident light, significantly reduces the veiling glare spoke of inside cavity
The amount of penetrating.
However in PST test process, it has been found that it is larger in camera deflection angle, as PST test thresholds are into one
Step reduces, and the test curve smoothly declined originally will appear " spike " noise, and the PST test results of entire camera are formed
Interference excludes these spike points and compares consuming testing time and cost, while easily technical staff is allowed to generate erroneous judgement.
Invention content
In order to exclude " spike " in PST test results, the present invention provides one kind to be used for point source transmission measurement
Improvement cavity, mainly twin columns tank middle section is improved for the light trapping of isosceles right triangle.
" spike " phenomenon occurred in PST test results by ray-tracing software is analyzed first, is analyzed
To the reason of PST data " spike " point as shown in Fig. 2, Fig. 2 show twin columns tank internal reflection light to " spike " data point contribute
Path profile, primary event light is directly incident on section as the one of waist of isosceles right triangle light trapping using wide-angle
Bian Shang, secondary reflection light enter in tank in twin columns top tank structure secondary reflection again, enter eventually at tested camera entrance pupil, according to this
Path, the reflectivity of acrylic board is about 4%, then the veiling glare energy PST values for being incident on camera are 10-4~10-5Magnitude, this and
Test result is identical, and isosceles right triangle light trapping is can be seen that for along incident parallel of optical axis by the path
The assimilation effect of light is fabulous, however undesirable for the absorption of the primary reflecting light of non-parallel light direction.
For this phenomenon, the present invention proposes following technical solution and provides one kind for point source transmission measurement
Improvement cavity, including seal cavity and the light trapping being arranged on outside seal cavity；The side wall of seal cavity is by cross section
Two curved surfaces for major arc dock；Light inlet is set at the docking of two curved surfaces；The top and bottom of seal cavity passes through flat
Plate seals；It is characterized in that：Above-mentioned light trapping is located at the docking of two curved surfaces opposite with light inlet；Above-mentioned light trapping
Cross section be isosceles trapezoid.
Preferably, the upper bottom surface that the face in isosceles trapezoid where bottom is light trapping is defined, the upper bottom surface inner wall of light trapping is set
There is delustring black cloth, its lap inner wall of light trapping is equipped with black acrylic board.
Preferably, the structure size of light trapping meets following constraints：
In formula,For the opening diameter of seal cavity light inlet, l is the radical length of seal cavity,It is opened for light trapping
Mouth size, l1Long for isosceles trapezoid waist, L is isosceles trapezoid bottom length.
Preferably, form seal cavity side wall two curved surfaces it is symmetrical, camera to be measured be located at two curved surface center of circle C1,
The midpoint of C2 lines.
Preferably, the material of the inner wall of above-mentioned seal cavity is black acrylic board.
Preferably, black acrylic board surface roughness is less than 5nm.
Preferably, the ratio of the distance between corresponding center of circle of two curved surfaces Δ r and camera maximum caliber d to be measured are more than etc.
In 3.
Preferably, the opening diameter of the light inlet of seal cavityMore than or equal to parallel light tube light extraction bore.
Preferably, the high h in the center of seal cavity0H high equal to parallel light tube center.
The beneficial effects of the invention are as follows：
The present invention improves light trapping of the twin columns tank middle section for isosceles right triangle, uses a kind of cross section
For the light trapping of isosceles trapezoid, the light trapping inner wall is in a manner that delustring black cloth and acrylic board combine, in parallel light path
The extinction capability of former light trapping has been fully retained, in non-parallel light path, matte black is passed through to the primary event light of wide-angle
Cloth is absorbed so that " spike " the noise energy that PST tests occur at least reduces by 10000 times, and the PST for improving Low threshold is surveyed
Examination, reduces the veiling glare background radiation in twin columns tank, improves measuring accuracy.
Description of the drawings
Fig. 1 is the light trapping structure and delustring schematic diagram that section is isosceles triangle；
Fig. 2 is the light trapping opticpath figure that section is isosceles triangle；
Fig. 3 is that the improved section of the present invention is the light trapping structure of isosceles trapezoid and delustring schematic diagram；
Fig. 4 is the light trapping opticpath figure that the improved section of the present invention is isosceles trapezoid；
Fig. 5 is the whole three-dimensional model diagram of the present invention.
Reference numeral is in figure：1- twin columns tanks, 2- light trappings, 3- are tested camera.
Specific embodiment
Below in conjunction with drawings and the specific embodiments, the present invention will be further described.
The present invention improves light trapping on the basis of the test cavity of 1 structure of twin columns tank, devises such as Fig. 3 institutes
Show a kind of follow-on light trapping device, the structure of 2 cross section of light trapping for isosceles trapezoid (plane where isosceles trapezoid with it is close
Top, the bottom for sealing cavity are parallel), the effect after being elongated for isosceles right triangle along base, while in the isosceles trapezoid
Upper bottom (figure chain lines) on use delustring black cloth as absorbed layer, acrylic material is still used at remaining length of side.It improves
Light trapping afterwards is identical with former light trapping to the parallel optical absorption along optical axis incidence, to above-mentioned non-parallel light direction
The assimilation effect of primary event light as shown in figure 4, due to delustring black cloth surface can approximation regard lambert's body as, reflectivity is low
In a ten thousandth, therefore the effect of the relatively former light trappings of light ray energy PST that can be back to tested 3 entrance pupil of camera can at least drop
Low 10000 times, about 10-8~10-9Magnitude can significantly improve the magnitude of reduction " spike " noise, and the PST of Low threshold is surveyed
Examination is advantageous.
During improved light trapping design, following parameter must be obtained：1) twin columns tank opening diameter2) twin columns canister length l.
As shown in figure 3, light trapping opening size isThe a length of l of isosceles trapezoid waist1, structure size need to meet constrains item as follows
Part：
After light trapping designs, bottom (chain-dotted line side shown in Fig. 3) inner wall uses delustring black cloth coating in isosceles trapezoid,
Remaining inner wall is used uniformly the splicing of black acrylic board.
During black acrylic board selection, surface roughness requirements are less than 5nm, and acrylic protective film should ensure that be tied in installation
It can remove after beam, to prevent from scratching, during structure design, inner wall size is unified for plus tolerance.
Claims (9)
1. a kind of improvement cavity for point source transmission measurement, including seal cavity and the light being arranged on outside seal cavity
Trap；The side wall of seal cavity is docked by two curved surfaces of the cross section for major arc；Light inlet is set at the docking of two curved surfaces；
The top and bottom of seal cavity passes through plate seal；It is characterized in that：The light trapping is located at two opposite with light inlet
At the docking of curved surface；The cross section of the light trapping is isosceles trapezoid.
2. the improvement cavity according to claim 1 for point source transmission measurement, it is characterised in that：Define isosceles ladder
Face in shape where bottom is the upper bottom surface of light trapping, and the upper bottom surface inner wall of light trapping is equipped with delustring black cloth, its lap of light trapping
Inner wall is equipped with black acrylic board.
3. the improvement cavity according to claim 2 for point source transmission measurement, it is characterised in that：
The structure size of light trapping meets following constraints：
In formula,For the opening diameter of seal cavity light inlet, l is the radical length of seal cavity,For light trapping open-mouth ruler
It is very little, l1Long for isosceles trapezoid waist, L is isosceles trapezoid bottom length.
4. the improvement cavity according to claim 3 for point source transmission measurement, it is characterised in that：Form annular seal space
Two curved surfaces of body sidewall are symmetrical, and camera to be measured is located at the midpoint of two curved surface center of circle C1, C2 lines.
5. the improvement cavity according to claim 4 for point source transmission measurement, it is characterised in that：The annular seal space
The material of the inner wall of body is black acrylic board.
6. the improvement cavity according to claim 5 for point source transmission measurement, it is characterised in that：Black acrylic
Plate surface roughness is less than 5nm.
7. the improvement cavity according to claim 6 for point source transmission measurement, it is characterised in that：Two curved surfaces pair
The ratio of the distance between center of circle answered Δ r and camera maximum caliber d to be measured is more than or equal to 3.
8. the improvement cavity according to claim 7 for point source transmission measurement, it is characterised in that：Seal cavity
The opening diameter of light inletMore than or equal to parallel light tube light extraction bore.
9. the improvement cavity according to claim 8 for point source transmission measurement, it is characterised in that：Seal cavity
The high h in center0H high equal to parallel light tube center.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810036063.0A CN108226100B (en) | 2018-01-15 | 2018-01-15 | Improved cavity for point source transmittance test |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810036063.0A CN108226100B (en) | 2018-01-15 | 2018-01-15 | Improved cavity for point source transmittance test |
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| Publication Number | Publication Date |
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| CN108226100A true CN108226100A (en) | 2018-06-29 |
| CN108226100B CN108226100B (en) | 2024-05-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810036063.0A Active CN108226100B (en) | 2018-01-15 | 2018-01-15 | Improved cavity for point source transmittance test |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110879133A (en) * | 2019-11-04 | 2020-03-13 | 中国科学院西安光学精密机械研究所 | Iris diaphragm device and point source transmittance testing system with same |
| CN110879132A (en) * | 2019-11-04 | 2020-03-13 | 中国科学院西安光学精密机械研究所 | Double-spherical cavity for point source transmittance test and point source transmittance test system |
| CN111025614A (en) * | 2019-12-24 | 2020-04-17 | 中国科学院西安光学精密机械研究所 | High-suppression-ratio optical trap |
| CN111795928A (en) * | 2020-06-28 | 2020-10-20 | 中国科学院西安光学精密机械研究所 | Glass for testing cavity of stray light testing system |
| CN114414502A (en) * | 2022-01-07 | 2022-04-29 | 中国工程物理研究院激光聚变研究中心 | Variable-angle transmittance measuring device, measuring system and measuring method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110879133A (en) * | 2019-11-04 | 2020-03-13 | 中国科学院西安光学精密机械研究所 | Iris diaphragm device and point source transmittance testing system with same |
| CN110879132A (en) * | 2019-11-04 | 2020-03-13 | 中国科学院西安光学精密机械研究所 | Double-spherical cavity for point source transmittance test and point source transmittance test system |
| CN111025614A (en) * | 2019-12-24 | 2020-04-17 | 中国科学院西安光学精密机械研究所 | High-suppression-ratio optical trap |
| CN111795928A (en) * | 2020-06-28 | 2020-10-20 | 中国科学院西安光学精密机械研究所 | Glass for testing cavity of stray light testing system |
| CN111795928B (en) * | 2020-06-28 | 2021-10-15 | 中国科学院西安光学精密机械研究所 | Glass for testing cavity of stray light testing system |
| CN114414502A (en) * | 2022-01-07 | 2022-04-29 | 中国工程物理研究院激光聚变研究中心 | Variable-angle transmittance measuring device, measuring system and measuring method |
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