CN105629464A - Diffraction-limiting imaging pseudo star source simulation system based on single reflector - Google Patents
Diffraction-limiting imaging pseudo star source simulation system based on single reflector Download PDFInfo
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- CN105629464A CN105629464A CN201610091474.0A CN201610091474A CN105629464A CN 105629464 A CN105629464 A CN 105629464A CN 201610091474 A CN201610091474 A CN 201610091474A CN 105629464 A CN105629464 A CN 105629464A
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- 238000004088 simulation Methods 0.000 title claims abstract description 16
- 238000003384 imaging method Methods 0.000 title claims abstract description 14
- 239000000835 fiber Substances 0.000 claims abstract description 52
- 238000003780 insertion Methods 0.000 claims abstract description 25
- 230000037431 insertion Effects 0.000 claims abstract description 25
- 239000013307 optical fiber Substances 0.000 claims abstract description 18
- 229910001374 Invar Inorganic materials 0.000 claims abstract description 17
- 230000008878 coupling Effects 0.000 claims abstract description 13
- 238000010168 coupling process Methods 0.000 claims abstract description 13
- 238000005859 coupling reaction Methods 0.000 claims abstract description 13
- 238000006073 displacement reaction Methods 0.000 claims abstract description 9
- 238000005253 cladding Methods 0.000 claims description 6
- 238000004026 adhesive bonding Methods 0.000 claims description 3
- 238000004080 punching Methods 0.000 claims 1
- 229910052736 halogen Inorganic materials 0.000 description 7
- 150000002367 halogens Chemical class 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 238000013461 design Methods 0.000 description 6
- 239000011521 glass Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 3
- 230000004075 alteration Effects 0.000 description 3
- 229910052804 chromium Inorganic materials 0.000 description 3
- 239000011651 chromium Substances 0.000 description 3
- 230000007774 longterm Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 235000019892 Stellar Nutrition 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000002050 diffraction method Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/0012—Optical design, e.g. procedures, algorithms, optimisation routines
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/0025—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for optical correction, e.g. distorsion, aberration
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Couplings Of Light Guides (AREA)
Abstract
The invention relates to a diffraction-limiting imaging pseudo star source simulation system based on a single reflector, and the system comprises a fiber coupling LED white light source, a zero-expansion insertion core single-mode optical fiber beam, an invar adjustment rack, a ULE reflector, an array detector, and a multidimensional displacement platform. The zero-expansion insertion core single-mode optical fiber beam is a single-mode fiber beam with the tail being equipped with a zero-expansion insertion core, wherein the zero-expansion insertion core is disposed on the invar adjustment rack. One end, far from the zero-expansion insertion core, of the single-mode fiber beam is connected with the fiber coupling LED white light source. The array detector is disposed on the multidimensional displacement platform. The array detector and the zero-expansion insertion core of the zero-expansion insertion core single-mode optical fiber beam are located on the same surface of the ULE reflector.
Description
Technical Field
The invention relates to the technical field of astronomy and space, in particular to a diffraction-limited imaging pseudo star source simulation system based on a single reflector.
Background
In the process of a star point image high-precision centroid positioning test, due to the influences of factors such as star point light source type selection, point light source design, optical element design and processing, structural design and the like, the performance of a pseudo star source simulation system is limited to a certain extent, and finally the star point image centroid positioning precision is influenced.
In terms of light source selection, generally, the light sources mainly include halogen lamps, LED lamps and the like. The halogen lamp has a larger size of the light emitting body, and the luminous efficiency of the halogen lamp is obviously weaker than that of the LED lamp, which causes great difficulty in coupling the halogen lamp and the single-mode optical fiber. In addition, the power stability of the halogen lamp is affected by the control of the luminous intensity of the halogen lamp, so that the LED lamp has great advantages compared with the halogen lamp in both aspects. In contrast, the LED light emitting chip is generally in millimeter level and easy to control power, and can well solve the problems of light emitting efficiency and power stability.
In the design of luminous points, one design adopts a diaphragm diffraction method. The method comprises the steps of plating a chromium film on a glass plate, and then generating a light through hole by a chemical corrosion method, wherein the thickness of the chromium film plated by the method is limited, and the OD value is not very large generally, so that the chromium film has certain transmittance except the light through hole, thus background interference can be generated, and the stray light interference has great influence on the measurement precision for high-precision centroid positioning. The diaphragm produced by the method has poor structural stability and high installation and adjustment difficulty. The ideal choice is to use a single-mode fiber bundle, and as the fiber core of the single-mode fiber bundle is generally about several microns, the imaging condition of a point light source can be easily met as long as the object numerical aperture meets certain requirements. The only problem is to use a reasonable fixing means. There are two common problems with the prior art securing means: firstly, zero-expansion materials are not used for the materials of the structural parts of the fixing device, so that the whole structure deforms along with the temperature change; secondly, the common fixing mode has no adjusting mechanism, namely the fixing mode is dead after assembly, and the fixing mode has no flexibility and universality.
Disclosure of Invention
The invention aims to solve the problems of insufficient satellite spacing stability, point spread function geometric aberration distortion, large adjustment difficulty and the like of the traditional pseudo-satellite source simulation system, and provides a pseudo-satellite source simulation system which can effectively keep the long-term stability of the satellite-point spacing, has no geometric aberration distortion of the point spread function and is simple and easy to install and debug.
In order to achieve the above object, the present invention provides a single-mirror-based diffraction-limited imaging pseudo-star source simulation system, comprising: the device comprises an optical fiber coupling LED white light source, a zero-expansion insertion core single-mode fiber bundle, an invar adjusting frame, a ULE reflector, an array detector and a multi-dimensional displacement platform; wherein,
the zero-expansion ferrule single-mode fiber bundle is a single-mode fiber bundle with a zero-expansion ferrule mounted at the tail, wherein the zero-expansion ferrule is mounted on the invar steel support frame, and one end of the single-mode fiber bundle, which is far away from the zero-expansion ferrule, is connected with a fiber coupling LED white light source; the array detector is installed on a multi-dimensional displacement table, and the array detector and a zero expansion insertion core in the zero expansion insertion core single-mode fiber bundle are located on the same face of the ULE reflector.
In the above technical scheme, all the light emitting points of the zero-expansion insertion core single-mode fiber bundle are formed in a single-mode fiber pigtail output mode.
In the technical scheme, when the zero-expansion ferrule single-mode fiber bundle is assembled, firstly, holes are punched in the zero-expansion ferrule, and the size of each hole is equivalent to the diameter of a cladding of a single-mode fiber; then the fiber core or the cladding of the optical fiber is directly inserted into the round hole, and finally the optical fiber and the ferrule are integrated by gluing.
In the above technical scheme, the invar adjusting frame comprises two parts: the adjusting frame is arranged on the mounting base, the two parts are connected through threads, and the lifting and the rotation of the adjusting frame are adjusted through the threads; and after the adjustment is finished, the mounting base and the adjusting frame are locked by the fastening nut.
In the technical scheme, the adjusting frame comprises a V-shaped groove for installing the zero-expansion insertion core single-mode fiber bundle, two threaded holes are formed in the V-shaped groove, and a screw penetrates into the threaded holes, so that the zero-expansion insertion core single-mode fiber bundle is fixed.
The invention has the advantages that:
1. the invention adopts the optical fiber coupling LED white light source, and can simulate the spectrum type of the actual fixed star more truly;
2. the invention adopts the single-mode fiber bundle design, can effectively avoid off-axis aberration and is easy to install and adjust;
3. the invention adopts the zero expansion inserting core, the invar steel adjusting frame and the ULE reflector, and can ensure the long-term stability of the inter-satellite distance.
Drawings
FIG. 1 is a schematic diagram of the structure of a single mirror diffraction limited imaging pseudo-star source simulation system of the present invention;
FIG. 2 is a schematic view of a ferrule of a zero expansion ferrule single mode fiber bundle;
fig. 3 is a schematic structural diagram of an invar adjusting frame.
Detailed Description
The invention will now be further described with reference to the accompanying drawings.
Referring to fig. 1, the single-mirror-based diffraction-limited imaging pseudo-star source simulation system of the present invention comprises: the device comprises an optical fiber coupling LED white light source, a zero-expansion insertion core single-mode fiber bundle, an invar adjusting frame, a ULE reflector, an array detector and a multi-dimensional displacement platform; the zero-expansion ferrule single-mode fiber bundle is a single-mode fiber bundle with a zero-expansion ferrule mounted at the fiber tail, wherein the zero-expansion ferrule is mounted on the invar steel support frame, and one end of the single-mode fiber bundle, which is far away from the zero-expansion ferrule, is connected with a fiber coupling LED white light source; the array detector is installed on a multi-dimensional displacement table, and the array detector and a zero expansion insertion core in the zero expansion insertion core single-mode fiber bundle are located on the same face of the ULE reflector.
The various components of the present invention are further described below.
All luminous points of the zero-expansion insertion core single-mode fiber bundle are formed in a mode of single-mode fiber pigtail output. Referring to fig. 2, when the zero-expansion ferrule single-mode fiber bundle is assembled, a hole is firstly punched on the zero-expansion ferrule, and the size of the hole is generally equivalent to the diameter of a cladding of a single-mode fiber; then the fiber core or the cladding of the optical fiber is directly inserted into the round hole, and finally the optical fiber and the ferrule are integrated by gluing. Such an assembly method does not exist in the prior art, so that the assembly method of the invention can effectively solve the problem of inter-satellite distance stability. Because the inserting core can be made very small, the fixing and adjusting problems of the single-mode optical fiber bundle are solved by combining the inserting core with the invar steel adjusting frame.
The optical fiber coupling LED white light source can ensure that the light source is close to a real stellar spectrum, and meanwhile, the coupling efficiency of the optical fiber in a visible light wave band is improved through the high luminous efficiency of the LED, so that the brightness of a pseudo-stellar source luminous point is ensured.
Referring to fig. 3, the invar adjusting stand includes two parts: the adjusting frame is arranged on the mounting base, the two parts are connected through threads, and the lifting and the rotation of the adjusting frame can be adjusted through the threads, so that the adjustment of two degrees of freedom is realized. And the adjusting device can be locked by a fastening nut after the adjustment is finished. The adjusting frame comprises a V-shaped groove for installing the zero-expansion insertion core single-mode fiber bundle, two threaded holes are formed in the V-shaped groove, and screws can penetrate into the threaded holes, so that the zero-expansion insertion core single-mode fiber bundle is fixed. The invar steel adjusting frame is combined with the zero-expansion insertion core of the zero-expansion insertion core single-mode fiber bundle, and the fixing and adjusting problems of the single-mode fiber bundle are solved.
The invar adjusting frame adopts zero expansion material, namely invar, as a supporting structure, so that the mechanical and thermal stability of the supporting structure is improved.
The ULE reflector is processed by ULE glass, and the ULE glass is a zero-expansion material, so that the optical stability can be increased, and the long-term stability of the inter-satellite distance can be ensured.
The array detector is used as an image acquisition component; the multi-dimensional displacement platform is used as a supporting and adjusting mechanism and can acquire two-dimensional star point images through adjustment of multiple dimensions.
Referring to fig. 1, when the diffraction-limited imaging pseudo star source simulation system of the single reflector of the present invention works, an optical fiber coupling LED white light source emits light, the emitted light is transmitted by a zero-expansion insertion core single-mode fiber bundle and then exits, the light is reflected by ULE glass, and finally captured and imaged by an array detector to obtain a two-dimensional star point image.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and are not limited. Although the present invention has been described in detail with reference to the embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (5)
1. A diffraction-limited imaging pseudo-star source simulation system based on a single reflector is characterized by comprising: the device comprises an optical fiber coupling LED white light source, a zero-expansion insertion core single-mode fiber bundle, an invar adjusting frame, a ULE reflector, an array detector and a multi-dimensional displacement platform; wherein,
the zero-expansion ferrule single-mode fiber bundle is a single-mode fiber bundle with a zero-expansion ferrule mounted at the tail, wherein the zero-expansion ferrule is mounted on the invar steel support frame, and one end of the single-mode fiber bundle, which is far away from the zero-expansion ferrule, is connected with a fiber coupling LED white light source; the array detector is installed on a multi-dimensional displacement table, and the array detector and a zero expansion insertion core in the zero expansion insertion core single-mode fiber bundle are located on the same face of the ULE reflector.
2. The single-mirror based diffraction limited imaging pseudolite source simulation system of claim 1, wherein all light emitting points of the zero-expansion ferrule single mode fiber bundle are formed by single mode fiber pigtail output.
3. The single-reflector-based diffraction-limited imaging pseudo-star source simulation system according to claim 1, wherein the zero-expansion ferrule single-mode fiber bundle is assembled by firstly punching a hole on the zero-expansion ferrule, wherein the size of the hole is equivalent to the cladding diameter of the single-mode fiber; then the fiber core or the cladding of the optical fiber is directly inserted into the round hole, and finally the optical fiber and the ferrule are integrated by gluing.
4. The single-mirror based diffraction limited imaging pseudostar source simulation system of claim 1, wherein the invar adjustment frame comprises two parts: the adjusting frame is arranged on the mounting base, the two parts are connected through threads, and the lifting and the rotation of the adjusting frame are adjusted through the threads; and after the adjustment is finished, the mounting base and the adjusting frame are locked by the fastening nut.
5. The single-reflector-based diffraction-limited imaging pseudo-star source simulation system according to claim 4, wherein the adjusting frame comprises a "V-shaped groove" for installing the zero-expansion ferrule single-mode fiber bundle, two threaded holes are formed in the "V-shaped groove", and screws are inserted into the threaded holes so as to fix the zero-expansion ferrule single-mode fiber bundle.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610091474.0A CN105629464A (en) | 2016-02-18 | 2016-02-18 | Diffraction-limiting imaging pseudo star source simulation system based on single reflector |
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| CN201610091474.0A CN105629464A (en) | 2016-02-18 | 2016-02-18 | Diffraction-limiting imaging pseudo star source simulation system based on single reflector |
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| CN201610091474.0A Pending CN105629464A (en) | 2016-02-18 | 2016-02-18 | Diffraction-limiting imaging pseudo star source simulation system based on single reflector |
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