CN100504502C - Broad spectral band prepositive aperture telecentric optical system - Google Patents

Broad spectral band prepositive aperture telecentric optical system Download PDF

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CN100504502C
CN100504502C CNB2007100184895A CN200710018489A CN100504502C CN 100504502 C CN100504502 C CN 100504502C CN B2007100184895 A CNB2007100184895 A CN B2007100184895A CN 200710018489 A CN200710018489 A CN 200710018489A CN 100504502 C CN100504502 C CN 100504502C
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lens
cemented doublet
optical glass
optical system
meniscus lens
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CN101165537A (en
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赵葆常
杨建峰
陈立武
常凌颖
贺应红
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XiAn Institute of Optics and Precision Mechanics of CAS
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XiAn Institute of Optics and Precision Mechanics of CAS
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Abstract

The lens group comprises: a positive meniscus lens and a negative meniscus lens; after the negative meniscus lens there are a front doublet lens, a biconvex lens and a rear doublet lens; the front doublet lens is negative focal power; the focal power synthesized by the positive meniscus lens, negative meniscus lens and front doublet lens is negative focal power; the biconvex lens is positive power, and the rear doublet lens is negative focal power.

Description

A kind of broad spectral band prepositive aperture telecentric optical system
Technical field
The present invention relates to a kind of Fu Shi optical system, be specifically related to the telecentric optical system of the automatic apochromatism of a kind of wide spectrum, long working distance, preposition unthreaded hole, can be used as separate optical system and use, be particularly useful for the Fu Shi optical system in the Sagnac type Fu Shi imaging spectrometer.
Technical background
Sagnac type Fourier transform inteference imaging spectrometer, generally by three groups independently optical imaging system serial connection constitute.Preset lens on it is positioned at the slit at focal plane place, produce target once as, through the Sagnac lateral shearing interferometer, slit image is two virtual images by lateral shear.Slit is positioned at again on the object space focal plane of Fu Shi mirror simultaneously, and the output of Fu Shi mirror has two coherent plane waves of certain angle of shear, forms interference fringe.Cylindrical mirror spatially is compressed to the interference fringe of two plane waves on one row or the CCD of the delegation pixel.The image quality of fourier lens had both influenced the spatial image quality of inteference imaging spectrometer, and the spectral resolution of spectrum and the S/N of multispectral image are restored in influence again, are the keys of whole inteference imaging spectrometer spectrum picture quality.Therefore, requirement to fourier lens is very harsh, adopted the several evaluation methods such as the depth of parallelism of how much disperses, MTF, wave aberration, emergent ray to estimate, no matter adopt that evaluation criterion, all require system to have extremely excellent quality, data can both be compatible after various evaluations of estimate were changed mutually.
Existing optical system for the heart feature far away of the automatic apochromatism of wide spectrum, long working distance, preposition unthreaded hole, can possess wherein any two characteristics, do not possess these whole characteristics but still have.
Summary of the invention
The object of the present invention is to provide a kind of broad spectral band prepositive aperture telecentric optical system, its solved still do not have in the technical background possess the automatic apochromatism of wide spectrum, the technical matters of the optical system of long working distance, preposition unthreaded hole heart characteristics far away.
Technical solution of the present invention is as follows:
A kind of broad spectral band prepositive aperture telecentric optical system, comprise lens combination 2, be positioned at the aperture diaphragm 1 at lens combination 2 front focal plane F places, its special character is, described lens combination 2 comprises: be positioned at lens combination 2 front portions and concave surface positive meniscus lens 201 and the diverging meniscus lens 202 near aperture diaphragm 01, be set in turn in diverging meniscus lens 202 preceding cemented doublet 203, biconvex lens 204 and back cemented doublet 205 afterwards; The concave surface of the cemented surface of cemented doublet 203 and back cemented doublet 205 is all near aperture diaphragm 1 before described; Cemented doublet 203 is a negative power before described, and described positive meniscus lens 201, diverging meniscus lens 202 are negative power with the synthetic focal power of preceding cemented doublet 203; Described biconvex lens 204 is a positive light coke; Described back cemented doublet 205 is a negative power.
Above-mentioned positive meniscus lens 201 is good to adopt TF3 optical glass, described diverging meniscus lens 202 is good to adopt LAK2 optical glass, cemented doublet 203 is good to be constituted by LAK2 optical glass and TF3 optical glass respectively before described, and described biconvex lens 204 is good to adopt LAK2 optical glass.
Above-mentioned back cemented doublet 205 is to constitute good by LAK2 optical glass and TF3 optical glass respectively; Described back cemented doublet 205 also can be made of K9 optical glass and TF3 optical glass respectively.
After the said lens group 2 prism 3 can be set, this prism 3 is positioned in the back focus of lens combination 2.
Above-mentioned prism 3 is good to adopt the Sagnac interferometer, also can adopt K9 optical glass or other interferometer.
The present invention has following advantage:
(1) design spectrum segment limit of the present invention is 480～960nm, and the spectral coverage width not only can reach diffraction limit more than 480nm; And ripple difference λ/40, disc of confusion is within 10 microns; System's picture element is fine, also has preposition pupil, as side's heart feature far away.
(2) lens combination adopts the focal power of negative positive and negative "-+-" to distribute, and makes the object space interarea pass forward, pass backward as square interarea, can realize that the lens combination both sides have long working distance simultaneously.
(3) two meniscus lens have reduced the height of the outer field rays of axle, and the distance between aperture diaphragm and the lens combination of having furthered has reduced the bore of two meniscus lens back lens.
(4) whole lens combination negative-just-condition that negative unusual focal power is distributed under, all aberrations can both reach rational correction.
(5) lens combination is selected two to three kinds of colouless optical glass pairings of the Chinese trade mark for use, mature production technology, ensure the quality of products easily, and it is cheap, aberration system automatically calibrating second order spectrum is put in digit absorption, common focal power is not distributed the second order spectrum that disappears and do not need to adopt, for the correction of other aberration provides the more freedom degree.Can satisfy the requirement of monochrome correction aberration and aberration, the curvature of field of cutting down now that has solved in the intensive light group approaches zero.
(6) be positioned on the front focal plane of lens combination owing to the effective aperture diaphragm, so satisfy the condition of picture Fang Yuanxin.In the Sagnac interferometer, the chief ray of each visual field all is parallel to optical axis, makes that axle is gone up, axle is outer has an identical optical path difference.Telecentric system has also improved illuminance of image plane simultaneously, and the requirement of out of focus is loosened.More near lens combination, picture element can be better for aperture diaphragm.
(7) the recovery spectrum picture signal to noise ratio (S/N ratio) of each spectrum channel is near photon noise limit, and system stability is reliable.
(8) because fourier lens mainly mates with interferometer, and its output is the coherent plane wave of wide spectrum, so the wave aberration of each each coloured light of visual field is better than Rayleigh criterion λ // 4 at least, the wave aberration average of each each spectral coverage of visual field of the present invention is about λ // 40.The maximum collimation error of each the coloured light emergent ray that sends from slit betides the maximum shear angle error and occurs in the maximum diameter of hole, and it is worth less than 0.00022, and when the aperture slightly dwindled, its collimation error was all less than 0.0001.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Fig. 2 is applied in the inteference imaging spectrometer behind the correcting chromatic aberration second order spectrum from the design aberration curve figure of normal moveout correction for the present invention.
Fig. 3 has reached the MTF figure that visual field, diffraction limit edge descends small for center of the present invention visual field MTF.
Fig. 4 is the point range figure of the maximum disc of confusion in visual field, center of the present invention, the maximum disc of confusion in visual field, edge.
Drawing reference numeral explanation: 1-aperture diaphragm, 2-lens combination, 201-positive meniscus lens, cemented doublet before the 202-diverging meniscus lens, 203-, 204-biconvex lens, cemented doublet behind the 205-, 3-prism.
Embodiment
The present invention be a kind of wide spectrum from the normal moveout correction second order spectrum, have the telecentric optical system of long working distance and preposition unthreaded hole.Can be used as separate optical system and use, also can be used as the fourier lens in the inteference imaging spectrometer, be particularly useful for the Fu Shi optical system in the Sagnac type Fu Shi imaging spectrometer.
Aperture diaphragm 1 is positioned at the front focal plane F place of lens combination 2, thereby has preposition pupil, as side's heart feature far away.In the Sagnac interferometer, the chief ray of each visual field all is parallel to optical axis, makes on the Sagnac interferometer axis, the outer optical path difference of axle is identical, and has improved image illumination uniformity.Aperture diaphragm 1 more shifts near lens combination 2, and off-axis image matter better.The present invention is used for the fourier lens of Sagnac type Fourier transform imaging spectrometer, can satisfy on the inteference imaging spectrometer axis, the requirement of the outer aplanatism difference of axle.In other was used, telecentric system made illuminance of image plane even.Also insensitive in the measurement and positioning system to out of focus.
Lens combination 2 is made up of five group of seven sheet glass, specifically can select simple glasses such as Lak2, the TF3 of China card number or K9 for use.Mature production technology is ensured the quality of products easily, and cheap.For example, the Lak2 of China's trade mark and the pairing of TF3 glass, behind 480nm and 960nm correcting chromatic aberration, because the partial dispersion coefficient of TF3 and Lak2 much at one, so aberration system automatically calibrating second order spectrum is put in digit absorption, common focal power is not distributed the second order spectrum that disappears and do not need to adopt, for the correction of other aberration provides the more freedom degree.Certain Abbe number difference DELTA ν and refractive index difference Δ n are arranged between Lak2 and the TF3 glass, can satisfy the requirement of monochrome correction aberration and aberration.The cemented surface of preceding cemented doublet 203 and back cemented doublet 205 all bends towards aperture diaphragm 1, with the control ratio chromatism.Simultaneously positive lens adopts the Lak2 of high index of refraction, the TF3 that negative lens adopts low-refraction, has solved cutting down the curvature of field now and approach zero in the intensive light group.
The condition of optical system correcting chromatic aberration under the prerequisite that satisfies the focal power requirement is:
C 1 = Σ i = 1 n h i 2 φ i v i = 0
The condition of proofreading and correct second order spectrum simultaneously is:
Σ i n h i 2 φ i v i P i = 0
Illustrate and proofread and correct C 1After, second order spectrum is from normal moveout correction.In the present invention's design, not only can reach And ripple difference λ/40, disperse class is within 10 microns.Because these two kinds of glass of Lak2, TF3 have very approaching partial dispersion coefficient, so need not be assigned as condition with focal power, just can realize from the normal moveout correction second order spectrum, and remaining second order spectrum are 0.0002
Figure C200710018489D00064
In the lens combination 2, it is one positive one negative that the focal power of positive meniscus lens 201 and diverging meniscus lens 202 is respectively, the corrective lens (eye protection) group that is equivalent to a no focal power after synthetic, all bend towards aperture diaphragm 1, airspace of equal value is 62.5mm, and the incident angle of field rays is reduced, and has reduced the height of the outer field rays of axle, furthered simultaneously distance between aperture diaphragm 1 and the lens combination 2 has reduced the bore of back lens.Require from aberration correction, positive meniscus lens 201 and diverging meniscus lens 202 have produced a certain amount of negative S I, S IIAnd S III, offset the positive S that main contributor's biconvex lens 204 of positive light coke produces with part I, S IIAnd S III
Preceding cemented doublet 203 is a negative power, and biconvex lens 204 is a positive light coke, and back cemented doublet 205 is a negative power, and positive meniscus lens 201, diverging meniscus lens 202 are negative power with the synthetic focal power of preceding cemented doublet 203.The cemented surface of preceding cemented doublet 203 and back cemented doublet 205 all bends towards aperture diaphragm 1, and they are except the same S that bears that also produces with correction group I, S IIAnd S IIIOutward, main is to produce positive C IAnd C II, offset the negative C of major part that biconvex lens 204 produces IAnd C II, make whole lens combination negative-just-condition that negative unusual focal power is distributed under, all aberrations all reach rational correction.Because above-mentioned reasonable configuration make the various aberrations of overall optical group all reach perfect correction, and the senior amount of aberration all is controlled within the rational numerical.
That lens combination of the present invention 2 adopts is negative-just-and negative focal power distributes, and makes the object space interarea pass forward, pass backward as square interarea, to reach long unthreaded hole distance and work distance simultaneously.Under the thickening lens condition, object space work is apart from interval greater than 0.78
Figure C200710018489D00064
To insert the cylinder optical system, reach 0.71 as side's work distance
Figure C200710018489D00064
To insert the Sagnac interferometer.Positive meniscus lens 201, diverging meniscus lens 202 are organized before constituting negative power with preceding cemented doublet 203, and their synthetic focal length is: f 1,2,3=-138.2mm; The focal distance f of back cemented doublet 205 5=-41.3mm is the positive light coke group between two groups, and focal length is f 4=26.7mm, constitute one to bear-just-negative focal power distribution.Spacing between positive meniscus lens 201 in the lens combination 2, diverging meniscus lens 202, preceding cemented doublet 203, biconvex lens 204 and the back cemented doublet 205 can be adjusted according to the focal power of designing requirement, volume, picture element etc. and set.
In the specific embodiment of the invention, positive meniscus lens 201 can adopt TF3 optical glass, diverging meniscus lens 202 can adopt LAK2 optical glass, preceding cemented doublet 203 can be made of LAK2 optical glass and TF3 optical glass respectively, biconvex lens 204 can adopt LAK2 optical glass, and back cemented doublet 205 can adopt K9 or LAK2 optical glass and TF3 optical glass to constitute.
Can be provided with prism 3 after the lens combination 2 of the present invention, these prism 3 equivalent interferometers are positioned in the back focus of lens combination 2.Prism 3 can obtain interference fringe, can expand function and application scope of the present invention.Cancellation prism 3, balance also can obtain the aberration quality of high-quality a little.Prism 3 replaceable for the Sagnac interferometer be good.
Empirical tests: the present invention has been applied in the inteference imaging spectrometer, under CCD Nyquist spatial frequency, the total system white light MTF measured value that contains CCD and electronic circuit reaches 0.51, the signal to noise ratio (S/N ratio) of interference fringe is about 500, and the recovery spectrum picture signal to noise ratio (S/N ratio) of each spectrum channel is near photon noise limit.For the mechanical environment condition that stands to make excessive demands, each lens has enough thickness in the lens combination 2, and through the random vibration of 14.4g, system stability is reliable.System to 480nm and two kinds of wavelength calibration aberration of 960nm after, second order spectrum is proofreaied and correct simultaneously.Referring to Fig. 2, remaining second order spectrum only is 0.0002
Figure C200710018489D00064
The result of calculation of transport function shows that visual field, center MTF has reached diffraction limit, and visual field, edge MTF only descends 0.08, when spatial frequency equals 50Lp/mm, and visual field, edge MTF〉0.6, referring to Fig. 3.
Can learn that from the disc of confusion size the maximum disc of confusion radius in visual field, center is: 0.765 micron, mean square deviation is 0.48 micron; The maximum disc of confusion radius in visual field, edge is 5.8 microns, and mean square deviation is 2.6 microns.To 10 microns square CCD pixels, maximum disperse is controlled within the pixel basically.Referring to Fig. 4.
Because fourier lens mainly mates with interferometer, its output is the coherent plane wave of wide spectrum, so the wave aberration of each each coloured light of visual field is better than Rayleigh criterion at least, the wave aberration average of each each spectral coverage of visual field of the present invention is about λ // 40.The maximum collimation error of each the coloured light emergent ray that sends from slit betides the maximum shear angle error and occurs in the maximum diameter of hole, and it is worth less than 0.00022, and when the aperture slightly dwindled, its collimation error was all less than 0.0001.

Claims (5)

1. broad spectral band prepositive aperture telecentric optical system, comprise lens combination (2), be positioned at the aperture diaphragm (1) that lens combination (2) front focal plane (F) is located, it is characterized in that, described lens combination (2) comprising: be positioned at the positive meniscus lens (201) of the close aperture diaphragm (1) of lens combination (2) front portion and concave surface and be positioned at lens combination (2) front portion and the diverging meniscus lens (202) of the close aperture diaphragm (1) of concave surface, be set in turn in diverging meniscus lens (202) preceding cemented doublet (203), biconvex lens (204) and back cemented doublet (205) afterwards; The concave surface of the cemented surface of cemented doublet (203) and back cemented doublet (205) is all near aperture diaphragm (1) before described; Cemented doublet (203) is a negative power before described, and described positive meniscus lens (201), diverging meniscus lens (202) are negative power with the synthetic focal power of preceding cemented doublet (203); Described biconvex lens (204) is a positive light coke; Described back cemented doublet (205) is a negative power.
2. broad spectral band prepositive aperture telecentric optical system according to claim 1, it is characterized in that, described positive meniscus lens (201) is a TF3 optical glass, described diverging meniscus lens (202) is a LAK2 optical glass, cemented doublet (203) is made of LAK2 optical glass and TF3 optical glass respectively before described, and described biconvex lens (204) is a LAK2 optical glass.
3. broad spectral band prepositive aperture telecentric optical system according to claim 1 and 2 is characterized in that, described back cemented doublet (205) is made of LAK2 optical glass and TF3 optical glass respectively; Or described back cemented doublet (205) is made of K9 optical glass and TF3 optical glass respectively.
4. broad spectral band prepositive aperture telecentric optical system according to claim 3 is characterized in that, the rear of described lens combination (2) is provided with prism (3), and this prism (3) is positioned in the back focus of lens combination (2).
5. broad spectral band prepositive aperture telecentric optical system according to claim 4 is characterized in that, described prism (3) is replaceable to be replaced for the Sagnac interferometer or with glass prism.
CNB2007100184895A 2007-08-15 2007-08-15 Broad spectral band prepositive aperture telecentric optical system Expired - Fee Related CN100504502C (en)

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Cited By (1)

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CN101846794A (en) * 2010-04-30 2010-09-29 北京工业大学 Image space telecentric direct writing projection imaging objective lens for excimer laser microprocessing

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CN103926680B (en) * 2014-04-08 2016-02-03 中国科学院空间科学与应用研究中心 A kind of long-focal distance optical system with the image space heart far away
CN104315973A (en) * 2014-10-31 2015-01-28 中国科学院长春光学精密机械与物理研究所 Dual-wavelength Fizeau laser interferometer standard reference mirror
CN105403980B (en) * 2015-12-15 2017-12-29 桂林电子科技大学 A kind of big visual field for Machine Vision Detection is without CaF2Superchromaticity camera lens
CN111556264A (en) * 2020-04-27 2020-08-18 中国科学院长春光学精密机械与物理研究所 Novel hyperspectral optical TDI camera imaging system
CN111854950A (en) * 2020-07-30 2020-10-30 中国科学院长春光学精密机械与物理研究所 Optical system of multi-time image surface spectrometer

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CN1213087A (en) * 1997-09-29 1999-04-07 松下电器产业株式会社 Projection lens
US6078048A (en) * 1998-04-27 2000-06-20 The Regents Of The University Of California Immersion echelle spectrograph
CN2884235Y (en) * 2006-02-16 2007-03-28 宁波广博数码科技有限公司 Lens of digital camera

Patent Citations (3)

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Publication number Priority date Publication date Assignee Title
CN1213087A (en) * 1997-09-29 1999-04-07 松下电器产业株式会社 Projection lens
US6078048A (en) * 1998-04-27 2000-06-20 The Regents Of The University Of California Immersion echelle spectrograph
CN2884235Y (en) * 2006-02-16 2007-03-28 宁波广博数码科技有限公司 Lens of digital camera

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101846794A (en) * 2010-04-30 2010-09-29 北京工业大学 Image space telecentric direct writing projection imaging objective lens for excimer laser microprocessing
CN101846794B (en) * 2010-04-30 2011-09-14 北京工业大学 Image space telecentric direct writing projection imaging objective lens for excimer laser microprocessing

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