CN208421433U - A kind of heavy caliber splicing photon screen - Google Patents
A kind of heavy caliber splicing photon screen Download PDFInfo
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- CN208421433U CN208421433U CN201820824532.0U CN201820824532U CN208421433U CN 208421433 U CN208421433 U CN 208421433U CN 201820824532 U CN201820824532 U CN 201820824532U CN 208421433 U CN208421433 U CN 208421433U
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Abstract
The utility model belongs to optical technical field, lead to the technical issues of photon screen resolution ratio reduces after splicing to solve large-diameter photon sieve stitching error, disclose a kind of heavy caliber splicing photon screen, heavy caliber splicing photon screen is spliced by several sub- photon screens, and the aperture position distribution of spliced heavy caliber splicing photon screen meets following equation:Aperture size is the multiple of Fresnel zone plate bright ring bandwidth；When in use using digital image restoration method by object by splice photon screen imaging carry out restore can be obtained clearly as；The technical program can manufacture large-sized photon screen, and reduce adjustment precision when photon screen splices using wavefront coding technology, and ensure that the image quality of spliced complete photonic sieve simultaneously.
Description
Technical field
The utility model belongs to optical technical field, and in particular to a kind of photon screen, especially a kind of large area are spliced
Photon screen.
Background technique
Photon screen is a kind of novel diffraction optical element proposed by Kipp in 2001, has and is similar to Fresnel
The diffractive optic characteristics of piece.Photon screen is all the Fresnel zone light transmission for making odd number or even number as Fresnel zone plate, and
Keep adjacent wavestrip opaque.The wavestrip of light transmission is designed to the micropore of light transmission by photon screen, these micropores are located in wavestrip, light wave
The distance of focus is reached by each micropore center and the integral multiple that the difference at a distance from focus is wavelength is reached by optical axis, so can
It focuses and is imaged to realize.Photon screen has the features such as light-weight, available spectrum range is wide, and spectral region covers traditional folding
Penetrate formula or SPECTRAL REGION that reflective optical device is difficult to realize, it can be from far infrared to grenz ray, extreme ultraviolet.Due to photon
Sifter device have it is compact-sized, it is light-weight, the advantages that flexible design, gradually start to be applied to space optics field, x-ray imaging, UV
Photoetching etc..
According to Rayleigh criterion, the resolution ratio of optical system and the clear aperture of optical element are directly proportional, if it is desired to improving light
The resolution ratio of system will be realized by increasing the bore of optical system.However have on the biggish photon screen of bore huge
The aperture of quantity disposably makes limitation of such large-diameter photon sieve by place, equipment and time.And work as heavy caliber light
When son sieve is used for astronomical telescope, huge area is unfavorable for the transport of carrier rocket.
To solve the above-mentioned problems, Guang Jin etc. is in document " Flat-stitching error analysis of
It proposes to use commonly in large-aperture photon sieves, Applied Optics, 53 (1): 90-95 (2014) "
Photon screen is spliced, however the experimental results showed that after the resetting difficulty of splicing is too big, and error when splicing leads to splicing
Photon screen image quality it is very poor.
Utility model content
The technical issues of the utility model solves is: existing large-diameter photon sieve stitching error causes photon after splicing to sieve
The technical issues of resolution reduces；To realize that the above technical purpose, technical solution are as follows:
A kind of heavy caliber splicing photon screen establishes orthogonal cartesian coordinate system using the optical axis of photon screen as z-axis, with (xm,
ym) indicate that m-th of small hole center position coordinates of photon screen, the heavy caliber splice photon screen and spliced by several sub- photon screens
It forms, the aperture position distribution of spliced heavy caliber splicing photon screen meets following equation:
In formula, f is the focal length of photon screen, and n is the annulus serial number of light passing annulus, and λ is operation wavelength, and R is the half of photon screen
Diameter, α are that phase coding coefficient, k are wave number, x three timesmAnd ymIt is the center position coordinates of m-th of aperture on n-th of light passing annulus；
Photon screen aperture size is the multiple of Fresnel zone plate bright ring bandwidth.
Using photon screen complete after splicing to image objects, imaging (also known as intermediary image) is fuzzy, because spelling
The position distribution for connecing rear complete photon screen is by phase coding, so information of the object after splicing photon screen obtains
Retain, it can be by blur image restoration at clear image using image restoration technology.
For the offset error of Z-direction: because the aperture position distribution of complete photon screen is by phase coding, institute
There is apparent expansion with the depth of focus that its depth of focus (L) is sieved relative to conventional photonic.The sub-light come is marked off from above-mentioned photon screen
The small pore size distribution of son sieve is also by phase coding, and there has also been apparent extensions for the depth of focus of individual sub- photon screen, so
The overlapping region of each sub- photon screen depth of focus still can retain complete information, can be answered by digital image restoration method
Original comes out.Splice as shown in Fig. 2, photon is sieved into two sub- photon screens, the mutual skew of the Z-direction of two sub- photon screens
△ Z is moved, as long as △ Z < L, the depth of focus of two sub- photon screens have overlapping region, object space information is obtained in this overlapping region
Retain, it can be by blur image restoration at clear image by image restoration technology.
Offset for X, Y-direction and around X Y Z axis rotation heeling error: because wavefront coding technology has aberration
Certain inhibiting effect, thus as X, Y-direction offset and around X Y Z axis rotate inclination caused by aberration can also obtain one
Determine the inhibition in degree.
Optimal technical scheme are as follows:
The range of phase coding factor alpha is 5 π to 50 π three times.With the increase of phase coding factor alpha three times, optical system
MTF reduce, it is meant that more noises can be introduced in image filtering restoration disposal process, cause the decline of signal-to-noise ratio.With
The reduction of phase coding factor alpha three times, phase coding degree reduce, and the alignment error for splicing photon screen will become larger.So must
Suitable phase coding factor alpha three times must be chosen, to make tradeoff between alignment error and acceptable signal-to-interference ratio.
Aperture is not overlapped is distributed on photon screen annulus at random.Aperture is randomly dispersed on annulus, rather than uniform close
Ground is distributed on annulus, it is possible to reduce the quantity of photon screen aperture reduces data, shortens process time.Aperture is not overlapped
Distribution is more conducive to process.
Sub- photon screen includes transparent flat substrate and the opaque metallic film that is plated in the transparent flat substrate, substrate with
Film is closely coupled, and opaque metallic film is equipped with light passing aperture, after sub- photon screen is spliced into complete photon screen, light passing
Aperture is ring-band shape distribution.
The transparent flat substrate is glass, and with a thickness of 2mm, opaque metallic film is opaque chromium film, thickness
For 100nm.
Aperture on the sub- photon screen of each marked off is complete.The dividing line for dividing sub- photon screen cannot pass through
Aperture.
Complete aperture is more conducive to process.
Since above-mentioned technical proposal is used, this programme has the advantage that compared with prior art
The spatial distribution of photon screen aperture position is subjected to phase coding, then photon screen piecemeal is spliced.Reduce big mouth
The manufacture difficulty of diameter photon screen and the splicing difficulty of piecemeal photon screen, at the same also assure spliced photon screen at image quality
Amount.
Detailed description of the invention
Fig. 1 is the production flow diagram of large-diameter photon sieve,
Fig. 2 is splicing schematic diagram of two sub- photon screens when Z-direction is offset,
Fig. 3 is the structural schematic diagram of complete photon screen,
Fig. 4 is the splicing schematic diagram after photon screening annulus divides,
Fig. 5 is the splicing schematic diagram after photon screen piecemeal divides,
Fig. 6 is the specific division schematic diagram of sub- photon screen,
Fig. 7 is point spread function figure of the directional light by the splicing photon screen of the direction z dislocation 1mm,
Fig. 8 is MTF corresponding to point spread function of the directional light after the splicing photon screen of the direction z dislocation 1mm,
Fig. 9 is resolving power test target formed vague image after the splicing photon screen of the direction z dislocation 1mm,
Figure 10 is sharply defined image of the vague image after restoring,
Figure 11 is the original graph of resolving power test target；
Specific embodiment
The utility model is further described with reference to the accompanying drawings and embodiments:
Embodiment:
This programme is further described with reference to the accompanying drawings and embodiments:
A kind of heavy caliber splicing photon screen, shown in Fig. 3, diameter D, the heavy caliber splices photon screen by several sub-lights
Sieve is spliced, and the aperture position distribution of spliced heavy caliber splicing photon screen meets following equation:
In formula, f is the focal length of photon screen, and n is the annulus serial number of light passing annulus, and λ is operation wavelength, and R is the half of photon screen
Diameter, α are that phase coding coefficient, k are wave number, x three timesmAnd ymIt is the center position coordinates of m-th of aperture on n-th of light passing annulus；
The wherein width of Fresnel zone plate bright ring bandPhoton screen aperture size is Fresnel zone plate bright ring bandwidth
Multiple；Code coefficient α is 20 π.
The heavy caliber splices photon screen can process in processing according to process flow as shown in Figure 1.
The mode that specific photon screen divides is any, and the shape and quantity of the sub- photon screen marked off are also arbitrary.It draws
Point mode includes dividing that annulus sector divides and piecemeal divides.Guarantee the aperture in each the sub- photon screen marked off when division
It is all complete.Below for two specific division examples.
It is the example that point annulus divides represented by Fig. 4.First it will be divided into three by the photon screen of phase coding in diagram
The section of ring-band shape, then by each interval division, finally obtain sub- photon screen to be processed.Sub- photon screen quantity is with light
Son sieve bore and change.The bore of photon screen is bigger, and the quantity of sub- photon screen is also more.The center for splicing photon screen can be with
It is the lesser complete photon screen of radius, is also possible to the photon screen that several sub- photon screens are spliced.Splice the outer of photon screen
Ring is spliced by the sub- photon screen of several ring-band shapes.
Fig. 5 and it is shown in fig. 6 be piecemeal divide example, wherein Fig. 5 is that photon screen is divided into four pieces, and Fig. 6 is to Fig. 5
In section further division.When being divided, it should ensure that the aperture on each section is complete.The bore of photon screen
Bigger, the sub- photon screen of division is more.
Ready-portioned sub-light screening block is processed, the sub- photon screen processed in the present embodiment includes transparent flat substrate
With the opaque metallic film being plated in the transparent flat substrate, wherein opaque metallic film is equipped with the logical of ring-band shape distribution
Light aperture.Transparent flat substrate is glass, with a thickness of 2mm.Opaque metallic film is opaque chromium film, with a thickness of
100nm。
Digital image restoration method will be restored by imaging after splicing photon screen.
The sub- photon screen of the two panels half of sieve (complete photonic) is spliced in the present embodiment, allows the direction z to misplace 1mm, puts down
Point spread function of the row light after the splicing photon screen is as shown in fig. 7, MTF is as shown in Figure 8.Resolving power test target is by splicing photon
Imaging after sieve is as shown in figure 9, the sharply defined image after being restored with image restoration technology is as shown in Figure 10.It is original with resolving power test target
Figure (Figure 11) is compared, and the picture of recovery has similar resolution ratio with original graph.This explanation, even if reaching in the direction z stitching error
In the case where 1mm, the photon screen of splicing image quality still with higher.
Therefore, the utility model in order to solve large-diameter photon sieve manufacture problem and tradition splicing photon screen splicing
The problems such as error is big, and image quality is bad, proposes a kind of heavy caliber splicing photon screen, and the aperture position distribution of the photon screen is
By phase coding, to reduce the adjustment precision of splicing, while also assure spliced large-diameter photon sieve at
Image quality amount.
The technical program unspecified part belongs to techniques well known.
Claims (7)
1. a kind of heavy caliber splicing photon screen establishes orthogonal cartesian coordinate system using the optical axis of photon screen as z-axis, with (xm, ym)
Indicate m-th of small hole center position coordinates of photon screen, it is characterised in that: the heavy caliber splices photon screen by several sub-lights
Sieve is spliced, and the aperture position distribution of spliced heavy caliber splicing photon screen meets following equation:
In formula, f is the focal length of photon screen, and n is the annulus serial number of light passing annulus, and λ is operation wavelength, and R is the radius of photon screen, α
For phase coding coefficient three times, k is wave number；
Photon screen aperture size is the multiple of Fresnel zone plate bright ring bandwidth.
2. a kind of heavy caliber described in claim 1 splices photon screen, it is characterised in that: the factor alpha of phase coding three times
Range is 5 π to 50 π.
3. a kind of heavy caliber according to claim 1 splices photon screen, it is characterised in that: the aperture is not overlapped point at random
Cloth is on photon screen annulus.
4. a kind of heavy caliber according to claim 1 splices photon screen, it is characterised in that: sub- photon screen includes transparent flat
Substrate and the opaque metallic film being plated in the transparent flat substrate, substrate is closely coupled with film, opaque metallic film
It is equipped with light passing aperture, light passing aperture is ring-band shape distribution.
5. a kind of heavy caliber according to claim 4 splices photon screen, it is characterised in that: the transparent flat substrate is glass
Glass, with a thickness of 2mm, opaque metallic film is opaque chromium film, with a thickness of 100nm.
6. according to a kind of heavy caliber splicing photon screen described in claim 1, it is characterised in that: the aperture on each sub- photon screen
It is completely, the dividing line for dividing sub- photon screen is not passed through aperture.
7. a kind of heavy caliber splicing photon screen described in one of -6 according to claim 1, it is characterised in that: the sub- photon screen
Boundary shape includes that annulus is fan-shaped, blocky.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820824532.0U CN208421433U (en) | 2018-05-30 | 2018-05-30 | A kind of heavy caliber splicing photon screen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820824532.0U CN208421433U (en) | 2018-05-30 | 2018-05-30 | A kind of heavy caliber splicing photon screen |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208421433U true CN208421433U (en) | 2019-01-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201820824532.0U Active CN208421433U (en) | 2018-05-30 | 2018-05-30 | A kind of heavy caliber splicing photon screen |
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2018
- 2018-05-30 CN CN201820824532.0U patent/CN208421433U/en active Active
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