CN100552489C - A kind of visual field beam splitter of spatial remotely sensed imaging instrument - Google Patents

A kind of visual field beam splitter of spatial remotely sensed imaging instrument Download PDF

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Publication number
CN100552489C
CN100552489C CNB2007103003567A CN200710300356A CN100552489C CN 100552489 C CN100552489 C CN 100552489C CN B2007103003567 A CNB2007103003567 A CN B2007103003567A CN 200710300356 A CN200710300356 A CN 200710300356A CN 100552489 C CN100552489 C CN 100552489C
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catoptron
slit
infrared
pan
pedestal
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CN101216596A (en
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颜昌翔
马仁宏
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Changchun Institute of Optics Fine Mechanics and Physics of CAS
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Changchun Institute of Optics Fine Mechanics and Physics of CAS
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Abstract

A kind of visual field beam splitter of spatial remotely sensed imaging instrument belongs to a kind of visual field beam splitter that relates in the space optics technical field.The technical matters that solves is: the visual field beam splitter that a kind of spatial remotely sensed imaging instrument is provided.The technical scheme that solves comprises base, PAN detector, PAN catoptron, short-wave infrared slit, pedestal, visible near-infrared catoptron, visible near-infrared slit etc.; Two prisms of the cylindrical body of pedestal 26 and left and right sides both ends of the surface are that the working body of parts such as associated reflections mirror, slit, slit base, PAN detector is installed; Left prism in cylindrical body is installed PAN catoptron 23, and the PAN detector is installed in the left side; At the right prism of cylindrical body visible near-infrared catoptron 27 is installed, install as seen through infrared slit the right side; The optical axis of incident light enters short-wave infrared slit 24 by two catoptron edge of a knife centers; PAN detector 22, short-wave infrared slit 24, visible near-infrared slit 30 threes are on the height of same level.

Description

A kind of visual field beam splitter of spatial remotely sensed imaging instrument
Technical field
The invention belongs to the visual field beam splitter of using in a kind of spatial remotely sensed imaging instrument that relates in the space optics technical field.
Background technology
The wavelength band of spatial remotely sensed imaging instrument is 400nm-2500nm, in wide like this spectral range, though can all cover with an autocollimator, but spectrometer can not adopt a spectrometer to realize the requirement of wide spectral band (generally using 2～4 spectrometers) because of being subjected to the restriction of dispersion element and focal plane device performance.Therefore, on shared telescope focal plane, adopt visual field beam splitter, the information separated of the different visual fields that telescope is observed is to different azimuth, observation in the time of visible near-infrared to realize (VNIR) spectrometer wavelength band (400nm-1000nm), short-wave infrared (SWIR) spectrometer wavelength band (1000nm-2500nm) and PAN detector full color imaging wavelength band (500nm-800nm).
Can visual field beam splitter decision remotely sensed imaging instrument realize the wide spectral range imaging of 400nm～2500nm, and directly what of each spectrometer and PAN detector energy influence enter, and also influences the spatial registration of spectrometer and the spectrum face picture element of spectrometer.From debuging angle, visual field beam splitter is the debugging benchmark with the spatial remotely sensed imaging instrument of its coupling.Two spectrometers in front end telescopic system and back and PAN detector will be benchmark with the slit of visual field beam splitter all, and string also connects the spatial remotely sensed imaging instrument hierarchal arrangement compact conformation that makes with its coupling; Visual field beam splitter is again and the coupling mechanism of spatial remotely sensed imaging instrument of its coupling that four parts in front and back are located butt joint here for unified complete instrument, can resolve into several standalone modules again easily simultaneously, debug separately and test, and realize modular design.Therefore visual field beam splitter is an important gordian technique interface of spatial remotely sensed imaging instrument.
The beam splitting way that has at home and abroad adopted in the spatial remotely sensed imaging instrument have with optical fiber, have use double color plate, but transmitance is low, instrument signal to noise ratio is low.The prior art the most approaching with the present invention is the patent of invention of Changchun Institute of Optics, Fine Mechanics and Physics, CAS in September, 1997 application, denomination of invention is imaging spectrometer spectral coverage separation method and spectral coverage tripping device, and the patent No. is ZL97118726.6.Comprise as shown in Figure 1
Screw 1, VNIR slit 2, catoptron 3, SWIR slit 4,
Compressing tablet 5, slit base 6, base plate 7, link stopper 8,
Screw 9, upper saddle 10, link stopper 11, compressing tablet 12,
Screw 13, lower slider 14, screw 15, slit base 16,
Screw 17, compressing tablet 18, base 19, spring leaf 20,
This spatial remotely sensed imaging instrument spectral coverage tripping device, the light by sending at a distance of two object points of certain intervals on the measured target projects the spectral coverage separation vessel through preposition telescope.The light that wherein sends converges directly to the entrance slit place of visible near-infrared (VNIR) spectrometer through preposition telescope, the light that another point sends converges to entrance slit 4 places of short-wave infrared (SWIR) spectrometer through preposition telescope, catoptron 3, the position of accommodation reflex mirror 3, some light beam that sends is all reflected enter SWIR slit 4, and don't block the light beam that another point sends and enter VNIR slit 2, observation when realizing two spectrometers.
The spectral coverage that this spectral coverage tripping device has only been made two spectrometers separates, in its device main, and VNIR slit 2, SWIR slit 4 and catoptron 3, their shape all is not only thin but also long, all only by the bottom very contact point of small size, fixes with glue and compressing tablet.And cut off large tracts of land all nothing support and supports of clear aperature part just, this structure can not be applicable to the requirement of space flight instrument anti shock and vibration.Physical dimension is big in addition, and particularly the adjusting mechanism size of catoptron is big, and it is unreliable to locate, and can not be used in the focal plane that is positioned at telescope and two spectrometers, PAN detector four systems, promptly in the narrow space size, realizes the request for utilization that separate three visual fields.
Summary of the invention
In order to overcome the problem that prior art exists, the objective of the invention is to make the visual field beam splitter that is positioned on the telescope focal plane, can dock observation when realizing many spectrometers of wide spectral range, a kind of visual field beam splitter that is suitable for wide spectral band beam splitting of ad hoc meter with many spectrometers.
The technical problem to be solved in the present invention is: the visual field beam splitter that a kind of spatial remotely sensed imaging instrument is provided.The technical scheme of technical solution problem comprises base 21, PAN detector 22, PAN catoptron 23, short-wave infrared slit 24, bonnet 25, pedestal 26, visible near-infrared catoptron 27, preceding washer 28, seam seat 29, visible near-infrared slit 30, gland 31, pedestal register pin 32, pedestal elongated slot 33, base register pin 34, base elongated slot 35 as shown in Figures 2 and 3
Two ends, the left and right sides on the base 21 have a base elongated slot 35 respectively, base register pin 34 is passed base elongated slot 35 to be fixed on the imaging spectrometer, move forward and backward along two elongated slots 35 on the base 21, can make base 21 can only be Y to moving, accurately be installed on the telescopical focal plane, use screw-driving then.Respectively there is a pedestal elongated slot 33 both sides before and after the bottom surface of pedestal 26, pass pedestal elongated slot 33 with pedestal register pin 32 and be fixed on location on the base 21,26 works of pedestal are moved along pedestal elongated slot 33, make the optical axis coincidence of visual field beam splitter and spatial remotely sensed imaging instrument, then with the fixing screw-driving of base 21.Central part at the upper surface of pedestal 26, it is a cylindrical body vertical with base-plates surface, cylindrical body and pedestal 26 are one, and two prisms of cylindrical body and left and right sides face are the working bodies that associated reflections mirror, slit, slit base, PAN detector parts are installed; On the propagation light path of incident light, H distance before the telescope focal plane is installed PAN catoptron 23 on the left prism of cylindrical body, and PAN catoptron 23 can be finely tuned about on the left prism, changes corresponding position, and both are connected the back, location with screw; On the right prism of cylindrical body, visible near-infrared catoptron 27 is installed, visible near-infrared catoptron 27 can be finely tuned about on the right prism, changes corresponding position, and both are connected the back, location with screw; Angle between the reflecting surface of the reflecting surface of PAN catoptron 23 and visible near-infrared catoptron 27 at an angle of 90, these two catoptrons can be finely tuned about on the prism separately, changing the distance of two reflecting surface angled end catoptron edges of a knife, the optical axis that makes incident ray enters short-wave infrared slit 24 by the center line of two catoptron edges of a knife; At the left surface of cylindrical body PAN detector 22 is installed, is made the angle angle at 45 of the reflecting surface of the image planes of PAN detector 22 and PAN catoptron 23, both are highly identical; Right flank in cylindrical body is installed visible near-infrared slit 30 by the seam seat 29 and the gland 31 that are fixed on the cylindrical body, make angle at 45 between the reflecting surface of visible near-infrared slit 30 and visible near-infrared catoptron 27, the left side at visible near-infrared slit 30, washer 28 before being equipped with, fixing with screw with seam seat 29; Telescope focal plane position in the back H distance of distance PAN catoptron 23 and visible near-infrared catoptron 27 reflecting surface that forms is equipped with short-wave infrared slit 24 by the bonnet 25 that is fixed on the cylindrical body; Make PAN detector 22, short-wave infrared slit 24, visible near-infrared slit 30 threes on the height of same level.
The principle of work explanation: the visual field beam splitter principle of work as shown in Figure 4.Choose light from the different visual fields of terrain object, be imaged on a, b, c 3 points on the telescope focal plane place short-wave infrared slit 24 respectively, their visual field is B at interval, the H distance adds PAN catoptron 23 and visible near-infrared catoptron 27 before the telescope focal plane, and visible near-infrared catoptron 27 is turned back 90 ° to the right to visible near-infrared slit 30 with the picture point a light beam of visible near-infrared visual field correspondence; PAN catoptron 23 is turned back 90 ° left to PAN detector image planes with the picture point c light beam of PAN detector 22 full color imaging instrument visual field correspondences; The picture point b light beam of short-wave infrared visual field correspondence passes in the middle of the edge of a knife of PAN catoptron 23 and visible near-infrared catoptron 27, and direct imaging is at short-wave infrared slit 24 places.The position of PAN catoptron 23 and visible near-infrared catoptron 27 needs to be provided with meticulously, guarantee that a, b, c three-beam divide three the tunnel to enter visible-near-infrared spectrum instrument, short-wave infrared spectrometer and PAN detector separately, the light beam of three visual fields separates fully, guarantees not produce each light beam again and mixes mutually.
Good effect of the present invention: this visual field beam splitter shows that through overtesting and detection in the 400nm-2500nm wavelength band, its transmitance all is higher than 96%, two mirror reflects ratio greater than 97%, and visual field beam splitting pixel registration error is less than 0.0023mm.Light beam mixes error (the non-light of choosing enters the veiling glare that is brought) mutually less than 1.6%.
The visual field beam splitter of employing brand-new design is divided into the light of different visual fields on the spatial remotely sensed imaging instrument telescopic system focal plane three-beam of different in width exactly at regular intervals, a branch of visible-near-infrared spectrum instrument that enters, a branch of short-wave infrared spectrometer that enters, another bundle enters the PAN detector, problems such as it has not only solved optical Fiber Method and double color plate method poor optical properties, transmitance is low, the spectrum shake is big, instrument signal to noise ratio is low simultaneously can anti shock and vibration.
Description of drawings:
Fig. 1 is the structural representation of prior art;
Fig. 2 is a visual field beam splitter master TV structure synoptic diagram of the present invention;
Fig. 3 is the plan structure synoptic diagram of Fig. 2;
Fig. 4 be principle of work of the present invention explanation with reference to synoptic diagram;
Fig. 5 be in the embodiment pedestal 26 install relevant catoptron, slit, PAN detector with reference to synoptic diagram.
Embodiment
The present invention presses Fig. 2 and structure shown in Figure 3 is implemented, and Fig. 2 and Fig. 3 comprise base 21, PAN detector 22, PAN catoptron 23, infrared slit 24, bonnet 25, pedestal 26, visible near-infrared catoptron 27, preceding washer 28, seam seat 29, visible near-infrared slit 30, gland 31, pedestal register pin 32, pedestal elongated slot 33, base register pin 34, base elongated slot 35.
Base 21 adopts titanium alloy processing; PAN detector 22 is outsourcing pieces; Stainless steel, electroplate are adopted in PAN catoptron 23 and 27 substrates of visible near-infrared catoptron.Because do not producing between each field rays mixes mutually, the positional precision of two catoptron cutting edges will guarantee in the 0.29mm.On the other hand, for fear of veiling glare, PAN catoptron 23 and visible near-infrared catoptron 27 sharp blades divide very sharp, flatness will be got well, it is impossible adopting common optical glass manufacturing, must adopt metal material processing through accurate adjustment assembling after grinding, otherwise be difficult to guarantee precision.We adopt stainless steel precision grinding rear surface silver-plated, guarantee that beauty defects is better than the III level, corrugated local error PV value λ/3; At 420nm～1000nm reflectivity 〉=96%.Short-wave infrared slit 24 and visible near-infrared slit 30, because slit is directly in the focal plane array detector imaging, any small defect on the slit all is deployed on the picture plane by the spectrometer chromatic dispersion, therefore very strict to the every error requirements of slit: as to stitch wide error 0.002mm, site error 0.005mm, slit surface does not allow defects such as pit greater than 0.001mm, burr, cut, and dark background does not allow defects such as the pin hole, bubble of 0.005mm.Visible near-infrared slit 30 and short-wave infrared slit 24 adopt the method processing that makes bright slit at quartz glass surface black chromium plating again by lithography.Bonnet 25 is selected titanium alloy processing for use, and pedestal 26 is selected titanium alloy processing for use, and pedestal 26 is as the installing and locating benchmark of visual field beam splitter, and two catoptrons and four optical elements of two slits all are installed on the visual field beam splitter pedestal.As shown in Figure 5, short-wave infrared slit 24 is by A face, the F face location of pedestal 26, (by base size L 1With SWIR slit sizes L 2Accuracy guarantee), make the SWIR slit be centered close to the telescope optic axis center.Visible near-infrared slit 30 positions are size L by the C face of pedestal 26 3Accuracy guarantee, visible near-infrared slit 30 can be regulated along the C face, make the visible near-infrared optical axis of slit centrally aligned.PAN catoptron 23 is contained on the D face of pedestal 26, and visible near-infrared catoptron 27 is contained on the B face of pedestal 26.A face, B face and D face angle are respectively α, β, and α, β angle and C face machining precision cause closes importantly, and accurately whether relative position directly influences the precision of visual field beam splitter between them.The pedestal 26 of visual field beam splitter can be done X, the adjustment of Y direction, guarantees that visual field beam splitter and telescope are coaxial.Preceding washer 28 usefulness copper sheets processing is contained on the seam seat 29 and plays fixation.Seam seat 29 is selected titanium alloy processing for use, and the C among meeting Fig. 5 is a benchmark, and four end faces of seam seat 29 bottom surfaces and dress slit are vertical with the C face, with fit dimension tolerance+0.010 of slit to+0.030.Gland 31 also with titanium alloy processing, is used for fixing slit.

Claims (1)

  1. The visual field beam splitter of 1 one kinds of spatial remotely sensed imaging instruments comprises visible near-infrared slit, visible near-infrared catoptron, short-wave infrared slit, slit base, base; It is characterized in that also comprising PAN detector (22), PAN catoptron (23), bonnet (25), pedestal (26), preceding washer (28), seam seat (29), gland (31), pedestal register pin (32), pedestal elongated slot (33), base register pin (34), base elongated slot (35); Two ends, the left and right sides on the base (21) have a base elongated slot (35) respectively, base register pin (34) is passed base elongated slot (35) be fixed on the imaging spectrometer, move forward and backward along two elongated slots (35) on the base (21); Respectively there is a pedestal elongated slot (33) both sides before and after the bottom surface of pedestal (26), pass pedestal elongated slot (33) with pedestal register pin (32) and are fixed on upward location of base (21), make pedestal (26) only do to move along pedestal elongated slot (33); Central part at the upper surface of pedestal (26), it is a cylindrical body vertical with base-plates surface, cylindrical body and pedestal (26) are integral pieces, and two prisms of cylindrical body and left and right sides face are the working bodies that associated reflections mirror, slit, slit base, PAN detector parts are installed; On the propagation light path of incident light, H distance before the telescope focal plane is installed PAN catoptron (23) on the left prism of cylindrical body, and PAN catoptron (23) can be finely tuned about on the left prism, and both are connected the back, location with screw; On the right prism of cylindrical body, visible near-infrared catoptron (27) is installed, visible near-infrared catoptron (27) can be finely tuned about on the right prism, and both are connected the back, location with screw; Angle between the reflecting surface of the reflecting surface of PAN catoptron (23) and visible near-infrared catoptron (27) at an angle of 90, these two catoptrons can fine setting about on the prism separately, is changing the distance of two reflecting surface angled end catoptron edges of a knife; At the left surface of cylindrical body PAN detector (22) is installed, is made the angle angle at 45 of the reflecting surface of the image planes of PAN detector (22) and PAN catoptron (23), both are highly identical; Right flank in cylindrical body is installed visible near-infrared slit (30) by the seam seat (29) and the gland (31) that are fixed on the cylindrical body, make angle at 45 between the reflecting surface of visible near-infrared slit (30) and visible near-infrared catoptron (27), the left side in visible near-infrared slit (30), preceding washer (28) is housed, fixing with screw and seam seat (29); Telescope focal plane position in the back H distance of distance PAN catoptron (23) and visible near-infrared catoptron (27) reflecting surface that forms is equipped with short-wave infrared slit (24) by the bonnet (25) that is fixed on the cylindrical body; PAN detector (22), short-wave infrared slit (24), visible near-infrared slit (30) three are on the height of same level.
CNB2007103003567A 2007-12-29 2007-12-29 A kind of visual field beam splitter of spatial remotely sensed imaging instrument Expired - Fee Related CN100552489C (en)

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CN101943602B (en) * 2010-07-28 2013-07-03 中国科学院长春光学精密机械与物理研究所 Field-of-view beam splitter of wide-width imaging spectrograph
CN107631797A (en) * 2017-09-01 2018-01-26 天津津航技术物理研究所 A kind of airborne multiband high light spectrum image-forming spectrometer opto-mechanical interface
CN113109949B (en) * 2021-04-09 2022-09-02 长春长光格瑞光电技术有限公司 Pinhole adjusting method of wide-spectrum high-resolution echelle grating monochromator

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CN1211728A (en) * 1997-09-17 1999-03-24 中国科学院长春光学精密机械研究所 Spectral segment separating method for imaging spectrometer and its separating device
CN201138389Y (en) * 2007-12-29 2008-10-22 中国科学院长春光学精密机械与物理研究所 Field beam splitter of space remotely sensed image instrument

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Publication number Priority date Publication date Assignee Title
CN1211728A (en) * 1997-09-17 1999-03-24 中国科学院长春光学精密机械研究所 Spectral segment separating method for imaging spectrometer and its separating device
CN201138389Y (en) * 2007-12-29 2008-10-22 中国科学院长春光学精密机械与物理研究所 Field beam splitter of space remotely sensed image instrument

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