CN207472424U - A kind of multi-optical spectrum imaging system - Google Patents
A kind of multi-optical spectrum imaging system Download PDFInfo
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- CN207472424U CN207472424U CN201721400041.5U CN201721400041U CN207472424U CN 207472424 U CN207472424 U CN 207472424U CN 201721400041 U CN201721400041 U CN 201721400041U CN 207472424 U CN207472424 U CN 207472424U
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Abstract
The utility model is related to a kind of multi-optical spectrum imaging system, including an objective lens, several spectroscopes, several optical filters, relaying microscope group and detector focal plane composition.Light splitting sum of series quantity is determined according to multispectral spectral coverage number, so that it is determined that spectroscope, optical filter, relaying microscope group and the quantity of detector focal plane, are distributed according to spectral coverage and determine that light splitting piece is that either color light splitting or the two reasonably combine for energy light splitting.By introducing the intermediate image plane with image space telecentricity in systems, the problem of overcoming the multispectral system difference field of view center wave length shift of interference filter chip, by controlling the distance of each detector focal plane and intermediate image plane, the purpose of different detector focal planes while detection is realized；Meanwhile under conditions of multispectral system gives visual field and focal length, increase the bore of system as needed.
Description
Technical field
The utility model belongs to optical imaging field, and in particular to a kind of multi-optical spectrum imaging system has image space telecentricity
Intermediate image plane, the Shared aperture based on light splitting, image has simultaneity, no parallax between spectral coverage.
Background technology
Multi-optical spectrum imaging system is a kind of imaging system that can obtain target image and spectral information simultaneously.It is widely used in
Military target investigation, territorial survey, vegetational analysis, climate watch, Crop Estimation, Matter Composition analysis etc..
Light spectrum image-forming can be divided into high light spectrum image-forming and multispectral imaging by spectral resolution height.The spectrum of multispectral imaging
Resolution ratio is relatively low, generally this technology path of filter plate is added to realize using imaging system.Common multi-optical spectrum imaging system has
Filter wheeled multi-optical spectrum imaging system and array multi-optical spectrum imaging system.The wheeled multi-optical spectrum imaging system advantage that filters is more
Time sharing shared same bore between spectrum picture, no parallax between image, shortcoming is that the image between spectral coverage is not to obtain simultaneously
, existence time is poor, is imaged suitable for closely static object；Array multi-optical spectrum imaging system is just on the contrary, advantage is each
A spectral coverage image is to obtain simultaneously, and without the time difference, shortcoming is that image is not same bore between spectral coverage, and there are parallaxes, are suitble to
It is imaged in remote dynamic object.
Multispectral imaging system based on filter plate there are one it is universal the problem of be exactly：Filter plate is through wave band with light
Incident angle increases to drift about to shortwave.Since filter plate is mostly filtered by being coated with multilayer dielectric film to realize, and with incidence angle
The characteristic that increase transmittance curve moves to left is that multilayer dielectric film is intrinsic.So in multi-optical spectrum imaging system, filter plate is general
All it is positioned over the smaller position of incident angle.In practical applications, it is not destroy the globality of optical lens, filter plate is generally placed
Before optical lens or it is placed in before rear lens focus face.The small-bore system for small field of view or being closely imaged, filter plate
It is typically placed at before optical lens.
For the preposition multispectral system of filter plate, to ensure a consistency for visual field spectrum transmitance, it is desirable that visual field is very
Small or optical lens is object space telecentricity.It is to infinite distance imaging to neglect field system, and general bore is larger, causes to filter chip size
Greatly.Object space telecentric lens can be used for close-in target, as described in ZL200910218528.5 and ZL200920244895.8
Optical system.
System for being placed in before rear lens focus face, to ensure a consistency for visual field spectrum transmitance, it is desirable that optics
Camera lens is image space telecentricity.Typical curious number (MSL) Marsokhod in such as U.S. carries multispectral camera, using quasi-telecentric camera lens, filter
Halo is between camera lens and focal plane.To obtain more wide spectrum multispectral image, optical system should be the image space telecentricity of total reflection
System, as US patents 4,226,501 (1980), U.S.Patent 4,240,707, ZL200910020932.1 and
The optical system such as ZL2013010426053.5.
Both the above multi-optical spectrum imaging system is required to according to spectral accuracy demand control object space and image-side numerical aperture, light
Bands of a spectrum are wide narrower, it is desirable that numerical aperture is smaller, this can cause to be imaged energy reduction, and reduce image spatial resolution.
Utility model content
In order to solve the above-mentioned technical problem, the utility model proposes a kind of multi-optical spectrum imaging systems.Specifically, it is one
Kind of the intermediate image plane with image space telecentricity, based on be divided Shared aperture, between spectral coverage image with simultaneity, parallax free mostly light
Spectrum imaging system, including entrance pupil 10, objective lens 11, N number of spectroscope and the filter plate set according to spectrum channel quantity, relaying
Microscope group and detector focal plane；The multi-optical spectrum imaging system includes at least two spectrum channels；Visual-field beam passes through entrance pupil first
It is incident in the multi-optical spectrum imaging system, for the objective lens will be focused on by the light beam of entrance pupil incidence, being formed has image space
The mode of the intermediate image plane of telecentricity is set；Spectroscopical quantity N >=1, visual-field beam are divided at least by N number of spectroscope
Two beams form a spectrum channel per beam light；Filter plate is to filter the light beam after light splitting in each spectrum channel
The mode of wave is set；Relaying microscope group is set in a manner of being focused in each spectrum channel to the light beam after light splitting；
Detector focal plane is set in a manner of the light after filtered filtering and relaying microscope group focusing are received in each spectrum channel
It puts；The distance of each detector focal plane to center image planes is equal.
Further, multi-optical spectrum imaging system includes two spectrum channels；Visual-field beam is incident on first by entrance pupil
In the multi-optical spectrum imaging system, intermediate image plane is focused the light beam in by the objective lens, light beam passes through the first spectroscope quilt
It is divided into two beams, wherein light beam forms the first spectrum channel, and the first spectrum channel is formed in the following manner：First spectroscope reflects
Light filtered by the first filter plate and then be focused by the first relaying microscope group and penetrate on the first detector focal plane；Separately
Light beam forms the second spectrum channel, and the second spectrum channel is formed in the following manner：The light beam of first spectroscope transmission passes through the
Two filter plates are filtered and then are focused by the second relaying microscope group and penetrated on the second detector focal plane；First detector is burnt
The distance of plane to intermediate image plane is equal with the distance of the second detector focal plane to intermediate image plane.
Further, the multi-optical spectrum imaging system includes eight spectrum channels；Visual-field beam is incident on by entrance pupil
In objective lens, objective lens focus the light beam in intermediate image plane, and light beam is divided into two beams by the first spectroscope；Wherein first light splitting
The light of mirror reflection is incident on the first secondary light-splitting mirror and carries out secondary light-splitting；The secondary light-splitting light beam transmitted by the first secondary light-splitting mirror
Be incident on the first three-level spectroscope occur three-level light splitting, the reflected beams therein by the first filter plate and first relaying microscope group it
After focus on the first detector focal plane, form the first spectrum channel, transmitted light beam passes through the second filter plate and the second relay lens
The second detector focal plane is focused on after group, forms the second spectrum channel；The secondary light-splitting reflected by the first secondary light-splitting mirror
Light beam is incident on the second three-level spectroscope and three-level light splitting occurs, and the reflected beams therein pass through third filter plate and third relay lens
Third detector focal plane is focused on after group, forms third spectrum channel, transmitted light beam passes through in the 4th filter plate and the 4th
The 4th detector focal plane is focused on after microscope group, forms the 4th spectrum channel；The light of first spectroscope transmission is incident on the
Two secondary light-splitting mirrors carry out secondary light-splitting；The light splitting of third three-level is incident on by the secondary light-splitting light beam that the second secondary light-splitting mirror transmits
Three-level light splitting occurs for mirror, and transmitted light beam therein focuses on the 5th detector after the 5th filter plate and the 5th relaying microscope group
Focal plane, forms the 5th spectrum channel, and the reflected beams focus on the 6th spy after the 6th filter plate and the 6th relaying microscope group
Device focal plane is surveyed, forms the 6th spectrum channel；4th three-level is incident on by the secondary light-splitting light beam that the second secondary light-splitting mirror reflects
Three-level light splitting occurs for spectroscope, and transmitted light beam therein focuses on the 7th spy after the 7th filter plate and the 7th relaying microscope group
Device focal plane is surveyed, forms the 7th spectrum channel, the reflected beams focus on the after the 8th filter plate and the 8th relaying microscope group
Eight detector focal planes form the 8th spectrum channel；The distance of eight detector focal planes to intermediate image planes is equal.
Further, the spectroscope is that energy light splitting or color light splitting or the two reasonably combine.
Since objective lens are image space telecentricities, and intermediate image plane to each detector focal plane apart from equal, different detectors
Focal plane can detect image simultaneously, and the visual field that different detector focal plane detections arrive is identical, will not generate difference and regard
The situation of field centre wavelength drift.
Further, under conditions of multispectral system gives visual field and focal length, system can be increased as needed
Bore.Advantageous effect：By introducing beam splitter, two advantages of no time difference and no parallax can be met simultaneously.By introducing picture
The intermediate image plane of Fang Yuanxin, we can determine the f# of object lens according to the spectral resolution of system, and (general spectral resolution is got over
Height, f# are bigger) it can be by adjusting the enlargement ratio of objective lens, to adjust system-wide f#.Multispectral system is come in this way
It says, the energy (spatial resolution) and spectral resolution of image, just becomes the variable of mutual Independent adjustable.
Description of the drawings
Fig. 1 is a kind of structure diagram of two spectrum channels multi-optical spectrum imaging system of the utility model；
Fig. 2 is a kind of structure diagram of eight spectrum channels multi-optical spectrum imaging system of the utility model；
Specific embodiment
For the purpose of this utility model, technical solution and advantage is more clearly understood, below in conjunction with specific embodiment, and
With reference to attached drawing, the utility model is further described.But those skilled in the art know, the utility model is not limited to
Attached drawing and following embodiment.
Fig. 1 is a kind of structure diagram of two spectrum channels multi-optical spectrum imaging system described in the utility model, this is multispectral
Imaging system includes two spectrum channels；Visual-field beam is incident on by entrance pupil 10 in the multi-optical spectrum imaging system first, is led to
It crosses the objective lens 11 and focuses the light beam in intermediate image plane, light beam is divided into two beams by the first spectroscope 21,
Wherein light beam forms the first spectrum channel, and the first spectrum channel is formed in the following manner：First spectroscope 21 is anti-
The light penetrated is filtered by the first filter plate 31 and then is incident on the first detector focal plane by the first relaying focusing of microscope group 41
On 51；
Another light beam forms the second spectrum channel, and the second spectrum channel is formed in the following manner：First spectroscope 21 transmits
Light beam filtered by the second filter plate 32 and then by second relaying microscope group 42 focusing be incident on the second detector focal plane
On 52；
First detector focal plane is to the distance of intermediate image plane and the distance phase of the second detector focal plane to intermediate image plane
Deng.
Fig. 2 is a kind of structure diagram of eight spectrum channels multi-optical spectrum imaging system described in the utility model, described more
Spectrum imaging system includes eight spectrum channels；Visual-field beam is incident on by entrance pupil 10 in objective lens 11, and objective lens 11 are by light
Beam focuses on intermediate image plane, and light beam is divided into two beams by the first spectroscope 21；
The light of wherein the first spectroscope 21 reflection is incident on the first secondary light-splitting mirror 22 and carries out secondary light-splitting；By the first two level
The secondary light-splitting light beam that spectroscope 22 transmits is incident on the first three-level spectroscope 24 and three-level light splitting, the reflected beams warp therein occurs
It crosses the first filter plate 31 and the first relaying microscope group 41 focuses on the first detector focal plane 51 later, form the first spectrum channel,
Transmitted light beam focuses on the second detector focal plane 52 after the second filter plate 32 and the second relaying microscope group 42, forms second
Spectrum channel；Second three-level spectroscope 25 is incident on by the secondary light-splitting light beam that the first secondary light-splitting mirror 22 reflects, three fractions occur
Light, the reflected beams therein focus on third detector focal plane after third filter plate 33 and third relaying microscope group 43
53, third spectrum channel is formed, transmitted light beam focuses on the 4th spy after the 4th filter plate 34 and the 4th relaying microscope group 44
Device focal plane 54 is surveyed, forms the 4th spectrum channel；
The light of first spectroscope 21 transmission is incident on the second secondary light-splitting mirror 23 and carries out secondary light-splitting；By the second secondary light-splitting
The secondary light-splitting light beam that mirror 23 transmits is incident on third three-level spectroscope 26 and three-level light splitting occurs, and transmitted light beam therein passes through
The 5th detector focal plane 55 is focused on after 5th filter plate 35 and the 5th relaying microscope group 45, forms the 5th spectrum channel, instead
Irradiating light beam focuses on the 6th detector focal plane 56 after the 6th filter plate 36 and the 6th relaying microscope group 46, forms the 6th light
Compose channel；4th three-level spectroscope 27 is incident on by the secondary light-splitting light beam that the second secondary light-splitting mirror 23 reflects, three fractions occur
Light, transmitted light beam therein focus on the 7th detector focal plane after the 7th filter plate 37 and the 7th relaying microscope group 47
57, the 7th spectrum channel is formed, the reflected beams focus on the 8th spy after the 8th filter plate 38 and the 8th relaying microscope group 48
Device focal plane 58 is surveyed, forms the 8th spectrum channel；The distance of eight detector focal planes to intermediate image planes is equal.
Further, the multi-optical spectrum imaging system involved in above-described embodiment, spectroscope are energy light splitting or color
Light splitting or the two reasonably combine.
The relevant parameter of system is determined according to the size for measuring visual field and detector focal plane first, since objective lens are pictures
Fang Yuanxin's, when light beam focuses on to form intermediate image plane, if the focal length of objective lens is excessive, the area of intermediate image plane can be caused to increase
Greatly, and then increase the volume of system, and the focal length of objective lens is too small, the cone angle that light beam focuses on can be caused to become larger so that be incident on
The beam incident angle degree increase of filter plate, increases to shortwave drift value with angle of incidence of light so as to cause wave band and becomes larger, pass through
The balance between system bulk and measurement accuracy can be realized to the adjusting of objective lens.
Since objective lens are image space telecentricities, and intermediate image plane to each detector focal plane apart from equal, different detectors
Focal plane can detect image simultaneously, and the visual field that different detector focal plane detections arrive is identical, will not generate difference and regard
The situation of field centre wavelength drift.
By introducing the intermediate image plane with image space telecentricity in systems, the multispectral system of interference filter chip is overcome
The problem of different market centre wave length shifts；It, can be according to need meanwhile under conditions of multispectral system gives visual field and focal length
Increase the bore of system.
More than, the embodiment of the utility model is illustrated.But the utility model is not limited to above-mentioned implementation
Mode.Within the spirit and principle of the utility model, any modification, equivalent substitution, improvement and etc. done, should be included in
Within the scope of protection of the utility model.
Claims (4)
1. a kind of multi-optical spectrum imaging system, including entrance pupil (10), objective lens (11), N number of spectroscope and according to spectrum channel quantity
Filter plate, relaying microscope group and the detector focal plane of setting；It is characterized in that：
The multi-optical spectrum imaging system includes at least two spectrum channels；
Visual-field beam is incident on by entrance pupil (10) in the multi-optical spectrum imaging system first, and the objective lens (11) will be will pass through
The light beam of entrance pupil (10) incidence focuses on, and the mode for forming the intermediate image plane with image space telecentricity is set；
Spectroscopical quantity N >=1, visual-field beam are divided at least two beams by N number of spectroscope, and a light is formed per beam light
Compose channel；
Filter plate is set in a manner of being filtered in each spectrum channel to the light beam after light splitting；
Relaying microscope group is set in a manner of being focused in each spectrum channel to the light beam after light splitting；
Side of the detector focal plane to receive filtered filtering in each spectrum channel and relay the light after microscope group focuses on
Formula is set；
The distance of each detector focal plane to center image planes is equal.
2. multi-optical spectrum imaging system according to claim 1, it is characterised in that：Multi-optical spectrum imaging system includes two spectrum
Channel；Visual-field beam is incident on by entrance pupil (10) in the multi-optical spectrum imaging system first, will by the objective lens (11)
Light beam focuses on intermediate image plane, and light beam is divided into two beams by the first spectroscope (21),
Wherein light beam forms the first spectrum channel, and the first spectrum channel is formed in the following manner：First spectroscope (21) reflects
Light filtered by the first filter plate (31) and then focused on by the first relaying microscope group (41) and be incident on the first detector coke and put down
On face (51)；
Another light beam forms the second spectrum channel, and the second spectrum channel is formed in the following manner：First spectroscope (21) transmission
Light beam is filtered by the second filter plate (32) and then is incident on the second detector coke by the second relaying microscope group (42) focusing and put down
On face (52)；
The distance of first detector focal plane to intermediate image plane is equal with the distance of the second detector focal plane to intermediate image plane.
3. multi-optical spectrum imaging system according to claim 1, it is characterised in that：The multi-optical spectrum imaging system includes eight
Spectrum channel；Visual-field beam is incident on by entrance pupil (10) in objective lens (11), and objective lens (11) focus the light beam in intermediary image
Face, light beam are divided into two beams by the first spectroscope (21)；
The light of wherein the first spectroscope (21) reflection is incident on the first secondary light-splitting mirror (22) and carries out secondary light-splitting；By the first two level
The secondary light-splitting light beam of spectroscope (22) transmission is incident on the first three-level spectroscope (24) and three-level light splitting, reflected light therein occurs
Beam focuses on the first detector focal plane (51) after the first filter plate (31) and the first relaying microscope group (41), forms first
Spectrum channel, transmitted light beam focus on the second detector coke after the second filter plate (32) and the second relaying microscope group (42) and put down
Face (52) forms the second spectrum channel；Second three-level is incident on by the secondary light-splitting light beam that the first secondary light-splitting mirror (22) reflects
Three-level light splitting occurs for spectroscope (25), and the reflected beams therein are after third filter plate (33) and third relaying microscope group (43)
Third detector focal plane (53) is focused on, forms third spectrum channel, transmitted light beam passes through the 4th filter plate (34) and the 4th
The 4th detector focal plane (54) is focused on after relaying microscope group (44), forms the 4th spectrum channel；
The light of first spectroscope (21) transmission is incident on the second secondary light-splitting mirror (23) and carries out secondary light-splitting；By the second secondary light-splitting
The secondary light-splitting light beam of mirror (23) transmission is incident on third three-level spectroscope (26) and three-level light splitting, transmitted light beam warp therein occurs
It crosses the 5th filter plate (35) and the 5th relaying microscope group (45) focuses on the 5th detector focal plane (55) later, form the 5th spectrum
Channel, the reflected beams focus on the 6th detector focal plane after the 6th filter plate (36) and the 6th relaying microscope group (46)
(56), the 6th spectrum channel is formed；Four or three fraction is incident on by the secondary light-splitting light beam that the second secondary light-splitting mirror (23) reflects
Three-level light splitting occurs for light microscopic (27), and transmitted light beam therein is poly- after the 7th filter plate (37) and the 7th relaying microscope group (47)
Coke forms the 7th spectrum channel, the reflected beams are passed through in the 8th filter plate (38) and the 8th to the 7th detector focal plane (57)
The 8th detector focal plane (58) is focused on after microscope group (48), forms the 8th spectrum channel, eight detector focal planes are arrived
The distance of intermediate image plane is equal.
4. according to claim 1-3 any one of them multi-optical spectrum imaging systems, it is characterised in that：The spectroscope is energy point
Light or color light splitting or the two reasonably combine.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107741275A (en) * | 2017-10-26 | 2018-02-27 | 中国科学院地理科学与资源研究所 | A kind of multi-optical spectrum imaging system |
| CN114942069A (en) * | 2022-07-25 | 2022-08-26 | 长春长光辰谱科技有限公司 | Wide-spectrum micro spectrometer |
-
2017
- 2017-10-26 CN CN201721400041.5U patent/CN207472424U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107741275A (en) * | 2017-10-26 | 2018-02-27 | 中国科学院地理科学与资源研究所 | A kind of multi-optical spectrum imaging system |
| CN114942069A (en) * | 2022-07-25 | 2022-08-26 | 长春长光辰谱科技有限公司 | Wide-spectrum micro spectrometer |
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