CN108226100B - Improved cavity for point source transmittance test - Google Patents
Improved cavity for point source transmittance test Download PDFInfo
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- CN108226100B CN108226100B CN201810036063.0A CN201810036063A CN108226100B CN 108226100 B CN108226100 B CN 108226100B CN 201810036063 A CN201810036063 A CN 201810036063A CN 108226100 B CN108226100 B CN 108226100B
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- 238000012360 testing method Methods 0.000 title claims abstract description 39
- 238000002834 transmittance Methods 0.000 title claims abstract description 13
- 230000003287 optical effect Effects 0.000 claims abstract description 27
- 238000007789 sealing Methods 0.000 claims abstract description 18
- 210000001503 joint Anatomy 0.000 claims abstract description 3
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 14
- 230000008033 biological extinction Effects 0.000 claims description 11
- 239000004744 fabric Substances 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 7
- 230000003746 surface roughness Effects 0.000 claims description 3
- 238000010521 absorption reaction Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 230000005855 radiation Effects 0.000 description 3
- 238000013459 approach Methods 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000003071 parasitic effect Effects 0.000 description 2
- 210000001747 pupil Anatomy 0.000 description 2
- 238000002310 reflectometry Methods 0.000 description 2
- 101100204059 Caenorhabditis elegans trap-2 gene Proteins 0.000 description 1
- CLOMYZFHNHFSIQ-UHFFFAOYSA-N clonixin Chemical compound CC1=C(Cl)C=CC=C1NC1=NC=CC=C1C(O)=O CLOMYZFHNHFSIQ-UHFFFAOYSA-N 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
Classifications
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- 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)
- Examining Or Testing Airtightness (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention belongs to the field of stray light testing of optical systems, and relates to an improved testing cavity for testing the transmittance of a point source of an optical system. The optical trap comprises a sealing cavity and an optical trap arranged outside the sealing cavity; the side wall of the sealing cavity is formed by butt joint of two curved surfaces with the cross section of a major arc; a light inlet is arranged at the joint of the two curved surfaces; the top and the bottom of the sealing cavity are sealed by a flat plate; the optical trap is positioned at the joint of the two curved surfaces opposite to the optical 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 the field of stray light testing of optical systems, and relates to an improved testing cavity for testing the transmittance of a point source of an optical system.
Background
In the PST test process, when a parallel light beam is incident to a light inlet of a camera, a signal obtained on a detection surface of the camera is superimposed with noise energy entering the camera due to reflection of other paths besides energy after the noise of the camera is suppressed and attenuated, and the paths comprise: (1) Reflection caused by the light source shining or scattering onto the laboratory wall and the ground; (2) Secondary reflection caused by the outer wall of the camera hood after being irradiated by parallel light; (3) air particle induced scattering. The energy entering the camera through the above approach is referred to as noise, and for the noise caused by approaches (1) and (2), the camera under test is typically placed in a separate test cavity to shield the reflected light in the external environment. As the inventor previously disclosed a testing cavity with a double-column tank structure in patent 2017113524719, because the testing cavity is limited by the laboratory size, and meanwhile, the stability of the testing environment outside the double-column tank is ensured, the parallel light beams entering the double-column tank, except the light beams entering the tested camera, must be attenuated and absorbed in the double-column tank, therefore, in order to minimize the stray light background radiation in the double-column tank, an optical trap with an isosceles right triangle cross section is generally used, the inner wall materials of the optical trap are all black acrylic, the effect of absorbing the incident parallel light is achieved, as shown in fig. 1, the parallel light enters the optical trap after passing through the camera, and returns in an original path after at least 5 times of reflection, and the emergent light energy is only 0.0000003 times of the incident light according to the absorption rate calculation of the acrylic plate, so that the stray light radiation quantity in the cavity is greatly reduced.
However, in the PST test process, we find that when the deflection angle of the camera is larger, with further reduction of the PST test threshold, some "peak" noise points appear on the originally smooth reduced test curve, so as to interfere the PST test result of the whole camera, and eliminating these peak points consumes test time and cost, and meanwhile, easily causes erroneous judgment for technicians.
Disclosure of Invention
In order to eliminate the peak in the PST test result, the invention provides an improved cavity for the point source transmittance test, which is mainly used for improving the optical trap with the isosceles right triangle cross section in the double-column tank.
The reason why the peak phenomenon appears in the PST test result is analyzed through ray tracing software, PST data peak point is obtained through analysis, as shown in fig. 2, fig. 2 shows a path diagram of contribution of the reflected ray in the double-column tank to the peak data point, the primary reflected ray directly enters one waist edge of the isosceles right triangle light trap with a large angle in cross section, the secondary reflected ray enters the tank and is reflected again on the inner wall of the double-column tank and finally enters the entrance pupil of the tested camera, according to the path, the reflectivity of the acrylic plate is about 4%, the parasitic energy PST value of the incident camera is 10 -4～10-5, the incident parasitic energy PST value is identical to the test result, and the path shows that the isosceles right triangle light trap has excellent absorption effect on parallel light incident along an optical axis, but is not ideal for absorption of primary reflected light in a non-parallel light direction.
Aiming at the phenomenon, the invention provides the following technical solution to provide an improved cavity for testing the point source transmittance, which comprises a sealed cavity and an optical trap arranged outside the sealed cavity; the side wall of the sealing cavity is formed by butt joint of two curved surfaces with the cross section of a major arc; a light inlet is arranged at the joint of the two curved surfaces; the top and the bottom of the sealing cavity are sealed by a flat plate; the special feature is that: the optical trap is positioned at the joint of the two curved surfaces opposite to the optical inlet; the cross section of the light trap is isosceles trapezoid.
Preferably, the surface of the isosceles trapezoid upper bottom is defined as the upper bottom surface of the light trap, the inner wall of the upper bottom surface of the light trap is provided with extinction black cloth, and the inner walls of the other surfaces of the light trap are provided with black acrylic plates.
Preferably, the structural dimensions of the optical trap satisfy the following constraints:
In the method, in the process of the invention, For the opening diameter of the light inlet of the sealing cavity, l is the radial length of the sealing cavity,/>For the size of the opening of the optical trap, L 1 is the isosceles trapezoid waist length, and L is the isosceles trapezoid bottom length.
Preferably, the two curved surfaces forming the side wall of the sealed cavity are mutually symmetrical, and the camera to be tested is positioned at the midpoint of the connecting line of the centers C1 and C2 of the two curved surfaces.
Preferably, the inner wall of the sealing cavity is made of a black acrylic plate.
Preferably, the surface roughness of the black acrylic plate is lower than 5nm.
Preferably, the ratio of the distance deltar between the circle centers corresponding to the two curved surfaces to the maximum caliber d of the camera to be measured is more than or equal to 3.
Preferably, the opening diameter of the light inlet of the sealing cavityThe aperture of the collimator is larger than or equal to the aperture of the collimator.
Preferably, the central height h 0 of the sealed cavity is equal to the central height h of the collimator.
The beneficial effects of the invention are as follows:
The invention improves the light trap with isosceles right triangle cross section in the double-column tank, uses the light trap with isosceles trapezoid cross section, the inner wall of the light trap adopts the combination mode of extinction black cloth and acrylic plate, the extinction capability of the original light trap is completely reserved in a parallel light path, and in a non-parallel light path, primary reflection light rays with large angles are absorbed through the extinction black cloth, so that the peak noise energy appearing in PST test is reduced by at least 10000 times, the PST test with low threshold value is improved, the stray light background radiation in the double-column tank is reduced, and the test precision is improved.
Drawings
FIG. 1 is a schematic diagram of an isosceles triangle cross-section light trap structure and extinction;
FIG. 2 is a light trap ray path diagram with isosceles triangle cross-section;
FIG. 3 is a schematic diagram of an improved optical trap structure with isosceles trapezoid cross section and extinction in accordance with the present invention;
FIG. 4 is a light trap ray path diagram of an isosceles trapezoid cross section modified according to the present invention;
fig. 5 is a diagram of an overall three-dimensional model of the present invention.
The reference numerals in the drawings are: 1-double column tank, 2-light trap, 3-camera under test.
Detailed Description
The invention is further described below with reference to the accompanying drawings and specific examples.
The invention improves the light trap on the basis of the testing cavity of the double-column tank 1 structure, and designs an improved light trap device as shown in figure 3, wherein the cross section of the light trap 2 has an isosceles trapezoid (the plane of the isosceles trapezoid is parallel to the top and the bottom of the sealing cavity), has the effect of stretching the isosceles right triangle along the bottom edge, and meanwhile, extinction black cloth is used as an absorption layer on the upper bottom (a dot-dash line in the figure) of the isosceles trapezoid, and acrylic materials are still used at the other side lengths. The improved light trap has the same absorption effect on the parallel light incident along the optical axis as the original light trap, and the absorption effect on the primary reflection light rays in the non-parallel light direction is shown in fig. 4, and the surface of the extinction black cloth can be approximately regarded as a lambertian body, the reflectivity is lower than one ten thousandth, so that the effect of the light energy PST capable of returning to the entrance pupil of the tested camera 3 relative to the original light trap can be reduced by 10000 times, about 10 -8～10-9 orders of magnitude, the magnitude of reducing the peak noise point can be greatly improved, and the low-threshold PST test is beneficial.
In the design of the improved optical trap, the following parameters are required to be obtained: 1) Diameter of opening of double column tank2) Length of double column tank.
As shown in fig. 3, the light trap opening is sized asThe isosceles trapezoid waist length is l 1, and the structural size needs to meet the following constraint conditions:
after the light trap is designed, the inner wall of the isosceles trapezoid upper bottom (the edge of a chain line shown in fig. 3) adopts a extinction black cloth coating, and the rest inner walls are spliced by uniformly adopting black acrylic plates.
When the black acrylic plate is selected, the surface roughness is required to be lower than 5nm, and the acrylic protective film can be removed after the installation is finished, so that scratch is prevented, and the inner wall size is unified to be a positive tolerance when the structural design is performed.
Claims (7)
1. An improved cavity for testing the transmittance of a point source comprises a sealed cavity and an optical trap arranged outside the sealed cavity; the side wall of the sealing cavity is formed by butt joint of two curved surfaces with the cross section of a major arc; a light inlet is arranged at the joint of the two curved surfaces; the top and the bottom of the sealing cavity are sealed by a flat plate; the method is characterized in that: the optical trap is positioned at the joint of the two curved surfaces opposite to the optical inlet; the cross section of the optical trap is isosceles trapezoid;
Defining the surface of the isosceles trapezoid upper bottom as the upper bottom surface of the light trap, wherein the inner wall of the upper bottom surface of the light trap is provided with extinction black cloth, and the inner walls of the other surfaces of the light trap are provided with black acrylic plates; in a non-parallel light path, absorbing primary reflected light rays with large angles through extinction black cloth, so that the peak noise energy generated by PST test is reduced by 10000 times;
the structural dimensions of the optical trap satisfy the following constraints:
In the method, in the process of the invention, For the opening diameter of the light inlet of the sealing cavity, l is the radial length of the sealing cavity,/>For the size of the opening of the optical trap, L 1 is the isosceles trapezoid waist length, and L is the isosceles trapezoid bottom length.
2. The improved cavity for point source transmittance testing according to claim 1, wherein: the two curved surfaces forming the side wall of the sealed cavity are mutually symmetrical, and the camera to be tested is positioned at the midpoint of the connecting line of the centers C1 and C2 of the two curved surfaces.
3. The improved cavity for point source transmittance testing according to claim 2, wherein: the inner wall of the sealing cavity is made of a black acrylic plate.
4. The improved cavity for point source transmittance testing according to claim 3, wherein: the surface roughness of the black acrylic plate is lower than 5nm.
5. The improved cavity for point source transmittance testing according to claim 4, wherein: the ratio of the distance delta r between the circle centers corresponding to the two curved surfaces to the maximum caliber d of the camera to be measured is more than or equal to 3.
6. The improved cavity for point source transmittance testing according to claim 5, wherein: opening diameter of light inlet of sealing cavityThe aperture of the collimator is larger than or equal to the aperture of the collimator.
7. The improved cavity for point source transmittance testing according to claim 6, wherein: the central height h 0 of the sealing cavity is equal to the central height h of the collimator.
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 |
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| 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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| CN108226100A CN108226100A (en) | 2018-06-29 |
| CN108226100B true CN108226100B (en) | 2024-05-10 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
| 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 |
| 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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