CN103823303B - A kind of meticulous Fourier's imaging device - Google Patents
A kind of meticulous Fourier's imaging device Download PDFInfo
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- CN103823303B CN103823303B CN201410077486.9A CN201410077486A CN103823303B CN 103823303 B CN103823303 B CN 103823303B CN 201410077486 A CN201410077486 A CN 201410077486A CN 103823303 B CN103823303 B CN 103823303B
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Abstract
The invention discloses a kind of meticulous Fourier's imaging device, comprise four lens set gradually, wherein, first piece of lens is meniscus shaped lens, concave surface facing target, convex surface facing image planes, second piece of lens is meniscus shaped lens, convex surface facing target, concave surface facing image planes, the 3rd piece of lens are lenticular lens, and the 4th piece of lens are meniscus shaped lens, convex surface facing target, concave surface facing image planes.Adopt total transmissivity formula structure, have optical texture simple, debug conveniently, image quality is good etc. a little, be applicable to modulate the Fourier of infinite distance target.
Description
Technical field
The present invention relates to optical technical field, particularly relate to a kind of meticulous Fourier's imaging device.
Background technology
Only carry the important carrier with transmission of information, and optical system collects and transmit the system of optical information.Light wave is all a kind of Fourier transform process through any optical system, and for conventional imaging optical system, only has paraxial visual field to meet accurate Fourier transform.Fourier transform lens meets requirement full filed light wave being carried out to strict Fourier transform, is the basic element of character in optical information processing system, for work such as image frequency content analysis, spatial filtering and relevant treatment.
Fourier transform optical system is different from common imaging optical system, and when designing, it has its oneself exclusive principle of design.
1) what Fourier transform lens obtained on back focal plane is not picture but the spectrum information of input face, and spectral linearity requires strict.This characteristic is also the one of the main reasons of Fourier transform lens as optical information processing components and parts.
2) Fourier transform lens must to the whole aberrations of two pairs of conjugate positions corrections except distortion, and be for a pair using the directional light after input face place diffraction as object space (being equivalent to thing in infinite distance), corresponding image space is frequency plane; Another is to being using input face as object, and corresponding picture is at image space infinite point.
3) Fourier transform lens must meet sine condition y=sin θ.This makes the spectrum position on back focal plane and the secondary linear necessary condition of the order of diffraction.
4) Fourier transform lens is generally used in coherent light, and therefore the flaw such as dust cut, bubble can cause strong coherent noise, and noise can become serious along with the increase of lens number.Therefore should reduce the quantity of eyeglass when optical design as far as possible.
Illustrated by the imaging characteristics of above-mentioned Fourier transform optical system, visible, need to consider to realize as far as possible large focal length with as far as possible few lens structure, complete the Fourier transform of light.
Summary of the invention
The object of the embodiment of the present invention is to provide a kind of meticulous Fourier's imaging device, realizes Fourier transform effect with less eyeglass.
The object of the embodiment of the present invention is achieved through the following technical solutions:
A kind of meticulous Fourier's imaging device, comprises four lens set gradually, wherein, first piece of lens is meniscus shaped lens, concave surface facing target, convex surface facing image planes, second piece of lens is meniscus shaped lens, convex surface facing target, concave surface facing image planes, the 3rd piece of lens are lenticular lens, and the 4th piece of lens are meniscus shaped lens, convex surface facing target, concave surface facing image planes.
The technical scheme provided as can be seen from the invention described above embodiment, adopt total transmissivity formula structure, with four mirrors, meet the index request of Fourier transform optical system, image resolution ratio is high, have optical texture simple, debug conveniently, image quality is good etc. a little, be applicable to modulate the Fourier of infinite distance target.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme of the embodiment of the present invention, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawings can also be obtained according to these accompanying drawings.
The formation schematic diagram of meticulous Fourier's imaging device that Fig. 1 provides for the embodiment of the present invention.
The transfer curve schematic diagram of meticulous Fourier's imaging device that Fig. 2 provides for the embodiment of the present invention.
The point range schematic diagram of meticulous Fourier's imaging device that Fig. 3 provides for the embodiment of the present invention.
Meticulous Fourier's imaging device that Fig. 4 provides for the embodiment of the present invention differs schematic diagram at the ripple of central wavelength.
The energy diagram of meticulous Fourier's imaging device that Fig. 5 provides for the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on embodiments of the invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to protection scope of the present invention.
As shown in Figure 1, the embodiment of the present invention provides a kind of meticulous Fourier's imaging device, comprise four lens set gradually (first piece of lens, 11, second piece of lens 12, the 3rd piece of lens 13, the 4th piece of lens 14), wherein, first piece of lens 11 is meniscus shaped lens, concave surface facing target, convex surface facing image planes, second piece of lens 12 is meniscus shaped lens, convex surface facing target, and concave surface facing image planes, 3rd piece of lens 13 are lenticular lens, 4th piece of lens 14 are meniscus shaped lens, convex surface facing target, and concave surface facing image planes.
The meticulous Fourier's imaging device of the embodiment of the present invention adopts total transmissivity formula structure, have optical texture simple, debug conveniently, image quality is good etc. a little, be applicable to modulate the Fourier of infinite distance target.
The meticulous Fourier's imaging device of the embodiment of the present invention, can also comprise aperture diaphragm 10, aperture diaphragm 10 is positioned at the front focal plane of described lens combination.
In order to reduce unnecessary veiling glare, aperture diaphragm 10 being placed on front focal plane place, controlling the size of processed surface, the diameter made it needed for ensureing can reduce unnecessary veiling glare again.
First piece of lens, 11, second piece of lens 12, the 3rd piece of lens 13, the 4th piece of lens 14 can be spherical mirror or aspheric mirror, unrestricted.
First piece of lens, 11, second piece of lens 12, the 3rd piece of lens 13, the 4th piece of lens 14, only meet the index request of Fourier transform optical system with four pieces of formations, structure is simple, has enough rear cut-off distances.
Concrete, table 1 is the optical mirror slip parameter of lens in the meticulous Fourier's imaging device of the embodiment of the present invention, and wherein sign symbol illustrates the bending direction of optical mirror slip.
Table 1:
The embodiment of the present invention also provides a kind of Fourier's imaging system, and comprise above-mentioned meticulous Fourier's imaging device and imaging detector, light is imaging on imaging detector after Fourier transform lens.
The meticulous Fourier's imaging device of the embodiment of the present invention only meets the index request of Fourier transform optical system with four pieces of formations, structure is simple, has enough rear cut-off distances.
Below from design angle, for Fourier's mirror, in order to by first-order diffraction light, most high spatial frequency Nmax, lens focus f ' and frequency plane diameter D
2between should meet following relationship:
Exemplary, as the Nmax=56lp/mm of certain detector, frequency plane diameter D
2=20mm, wavelength centered by λ, then system focal distance f ' <357mm, Fourier Optical System more easily realizes for focal length is more long specifically to select f '=260mm(to consider, can realize the index request of Fourier Optical System in the design process).
First piece of lens 11 is meniscus shaped lens, and concave surface facing target, convex surface facing image planes; Second piece of lens 12 is meniscus shaped lens, convex surface facing target, and concave surface facing image planes; 3rd piece of lens 13 are lenticular lens; 4th piece of lens 14 are meniscus shaped lens, convex surface facing target, and concave surface facing image planes.
Aperture diaphragm 10 be positioned at first piece of lens 11 front surface before 248.2mm place, this value is through the optical texture front focal plane place of accounting, and debug in process in system and find focal plane to determine stop position, aperture, therefore not to repeat here.
In order to optical manufacturing, optical detection convenience and reduce costs, lensed optical surface of the present invention is sphere.
The key technical indexes of the meticulous Fourier's imaging device of the embodiment of the present invention is: operation wavelength is within the scope of 450nm ~ 700nm, and centre wavelength is 560nm, and image planes size D is 21.6mm, system F/#=f '/D=12.
Visible, 260mm focal length selected by the meticulous Fourier's imaging device of the embodiment of the present invention, belongs to middle long-focus.
Namely the meticulous Fourier's imaging device of the embodiment of the present invention can realize modulating the Fourier of infinite distance target, and the target nearby that can also realize focusing plane place conversely obtains its frequency plane at diaphragm place.
As shown in Figure 2, the typical wavelengths of the meticulous Fourier's imaging device of the embodiment of the present invention is in the transport function of full filed, and as can be seen from Figure 2, the image quality of each wavelength within nyquist frequency is all close to diffraction limit.
As shown in Figure 3, the point range figure of the transform lens structure of the meticulous Fourier's imaging device of the embodiment of the present invention, as can be seen from Figure 3, the RMS value of all wavelengths is all in Airy disk.
As shown in Figure 4, the Fourier transform lens of the meticulous Fourier's imaging device of the embodiment of the present invention differs at the ripple of central wavelength, as can be seen from Figure 4, PTV (PeakToValley) value of centre wavelength is (1/60) wavelength, root-mean-square value is (1/217) wavelength, meets the optical requirement of fourier lense.Visible, embodiment of the present invention Fourier transform lens, PTV value can reach 1/60, and therefore image resolution ratio is high, belongs to meticulous middle long focal length optical imaging arrangement.
As shown in Figure 5, the energygram of the Fourier transform lens of the meticulous Fourier's imaging device of the embodiment of the present invention, as can be seen from Figure 5, Fourier's imaging device because of number of lenses few, rational in infrastructure, its transmission potential is close to diffraction limit.
The meticulous Fourier's imaging device of the embodiment of the present invention is compared with prior art:
The embodiment of the present invention meticulous Fourier's imaging device movement-less part, compact conformation, system stability is good, and reliability is high;
Namely the embodiment of the present invention meticulous Fourier imaging device is the image space heart far away, is again the object space heart far away, can be convenient to be connected with other mirror group structures, form more complicated optical system, realize the change action of fourier lense;
The optical system structure form of the meticulous Fourier's imaging device of the embodiment of the present invention is simple, and easily realize, all optical elements are coaxial, are easy to debug.
Claims (3)
1. meticulous Fourier's imaging device, is characterized in that, comprises four lens set gradually, wherein, first piece of lens is meniscus shaped lens, concave surface facing target, convex surface facing image planes, second piece of lens is meniscus shaped lens, convex surface facing target, and concave surface facing image planes, 3rd piece of lens are lenticular lens, 4th piece of lens are meniscus shaped lens, convex surface facing target, and concave surface facing image planes;
The curvature r1 of described first piece of lens front surface is-50.575, and rear surface curvature r2 is-79.206, and refractive index is 1.514777, and Abbe number is 0.5895, and thickness is 6mm;
The curvature r1 of described second piece of lens front surface is 248.036, and rear surface curvature r2 is 77.938, and refractive index is 1.514777, and Abbe number is 38.0299, and thickness is 5mm;
The curvature r1 of described 3rd piece of lens front surface is 81.802, and rear surface curvature r2 is-75.684, and refractive index is 1.514777, and Abbe number is 81.6079, and thickness is 12mm;
The curvature r1 of described 4th piece of lens front surface is 43.02, and rear surface curvature r2 is 37.417, and refractive index is 1.514777, and Abbe number is 27.5306, and thickness is 10mm.
2. meticulous Fourier's imaging device according to claim 1, it is characterized in that, also comprise aperture diaphragm, described aperture diaphragm is positioned at the front focal plane of described lens combination.
3. meticulous Fourier's imaging device according to claim 1 and 2, is characterized in that, described first piece of lens, described second piece of lens, described 3rd piece of lens and described 4th piece of lens are spherical mirror or aspheric mirror.
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| CN201410077486.9A CN103823303B (en) | 2014-03-04 | 2014-03-04 | A kind of meticulous Fourier's imaging device |
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| CN201410077486.9A CN103823303B (en) | 2014-03-04 | 2014-03-04 | A kind of meticulous Fourier's imaging device |
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| CN103823303B true CN103823303B (en) | 2016-03-09 |
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| CN114279690A (en) * | 2021-12-24 | 2022-04-05 | 中国科学院光电技术研究所 | Fourier transform objective lens for micro fly's eye lens array element measurement |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07311351A (en) * | 1994-05-16 | 1995-11-28 | Kiyousera Opt Kk | Wide angle eyepiece system |
| JPH11133297A (en) * | 1997-11-04 | 1999-05-21 | Fuji Photo Film Co Ltd | Fourier transform lens |
| TWI260010B (en) * | 2005-06-03 | 2006-08-11 | Hon Hai Prec Ind Co Ltd | Fourier-transform optical system and volume holographic storage optical system |
| CN1862306A (en) * | 2005-05-13 | 2006-11-15 | 清华大学 | Asymmetric Fourier transform optical system and holographic storage optical system |
| CN1866077A (en) * | 2005-05-20 | 2006-11-22 | 清华大学 | Fourier transform optical system and volume holographic storage Fourier transform optical system |
-
2014
- 2014-03-04 CN CN201410077486.9A patent/CN103823303B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07311351A (en) * | 1994-05-16 | 1995-11-28 | Kiyousera Opt Kk | Wide angle eyepiece system |
| JPH11133297A (en) * | 1997-11-04 | 1999-05-21 | Fuji Photo Film Co Ltd | Fourier transform lens |
| CN1862306A (en) * | 2005-05-13 | 2006-11-15 | 清华大学 | Asymmetric Fourier transform optical system and holographic storage optical system |
| CN1866077A (en) * | 2005-05-20 | 2006-11-22 | 清华大学 | Fourier transform optical system and volume holographic storage Fourier transform optical system |
| TWI260010B (en) * | 2005-06-03 | 2006-08-11 | Hon Hai Prec Ind Co Ltd | Fourier-transform optical system and volume holographic storage optical system |
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