CN203587939U - Wide-field compact type polarization imaging camera - Google Patents
Wide-field compact type polarization imaging camera Download PDFInfo
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- CN203587939U CN203587939U CN201320727065.7U CN201320727065U CN203587939U CN 203587939 U CN203587939 U CN 203587939U CN 201320727065 U CN201320727065 U CN 201320727065U CN 203587939 U CN203587939 U CN 203587939U
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- 230000010287 polarization Effects 0.000 title claims abstract description 48
- 238000003384 imaging method Methods 0.000 title claims abstract description 33
- 230000003287 optical effect Effects 0.000 claims description 17
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- 239000013307 optical fiber Substances 0.000 claims description 10
- 241000219739 Lens Species 0.000 description 45
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- 238000001514 detection method Methods 0.000 description 6
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Abstract
The utility model discloses a wide-field compact type polarization imaging camera. The distance of the last lens surface of an objective lens to image sensors is much longer than the focal length of the objective lens. A plurality of beam splitters are disposed between the objective lens and the image sensors. After a light beam is split by the beam splitters into a plurality of light beams having the same number as that of the image sensors, each light beam is then imaged through a linear polarizing film into a corresponding image sensor. According to the utility model, by use of a rear long working-distance objective lens composed of a front negative lens group and a rear positive lens group, in the case of small objective lens focal length and large imaging field of view, the distance from the objective lens to the image sensors can be effectively increased, the plurality of beam splitters, polarizing elements and image sensors can be arranged in the space, and the volume of an amplitude-splitting measurement-polarization imaging system is effectively reduced.
Description
Technical field
The utility model relates to a kind of imaging camera, particularly a kind of wide visual field volume compact type polarization imaging camera
Background technology
Polarization imaging (polarization imaging) or Stokes polarization imaging (stokes polarization imaging) technology is the New Image Detection Techniques that development in recent years is got up, with traditional light intensity map as compared with Detection Techniques, can obtain the parameters such as polarization intensity, degree of polarization, polarization angle and the polarization ellipticity of target light radiation, greatly increase the quantity of information of detected target.Based on these advantages, polarization imaging technology has important using value in fields such as medical science, industry and national defence.
Main polarization imaging detection mode has timing method, integrated micro-polarizer Array Method and point amplitude measurement mode at present.At least four width polarization images that time-ordered measurement method adopts machinery to switch or the mode of liquid crystal modulation is obtained different polarization direction successively according to sequential obtain the polarization characteristic of the detection of a target.Time-ordered measurement method depends on target and the hypothesis of polarization imaging detection system in relative static conditions in measuring process, and irradiation condition is constant.Therefore this method is limited to static or without the target detection of polarization variations.
Integrated micro-polarizer Array Method, it is the small polarizer of integrated matrix form on imageing sensor, make the corresponding a kind of linear polarization of the each pixel of imageing sensor or wave plate phase place, then adopt the account form of pixel interpolating, by sacrificing spatial resolution, obtain all polarization informations of photographic subjects.
Divide amplitude measurement mode at first by propositions such as Garlick, this imager comprises four independently image detectors, use same object lens, utilize a series of polarized light beam splitter and period of delay, again through four independently imaging system the polarization image of different polarization directions is imaged on four detectors, so just can obtain four required width polarization images of target Stokes parameter simultaneously.Because the polarization beam apparatus adopting in the method has taken larger space, the focal plane of image-forming objective lens generally can not directly reach four independently imageing sensors.The way addressing this problem at present has two kinds: 1. adopt four relaying camera lenses respectively the picture of image-forming objective lens to be imaged on respectively on four detectors.The method can increase optical system volume and optics is adjusted complexity.2. reduce the thickness of beam splitter prism and the focal length of increase image-forming objective lens.There is at present the polarization imaging camera of three imageing sensors, but owing to being difficult to further compression stroke, be difficult to add the 4th imageing sensor, so do not belong to full Stokes polarization imaging truly; In addition, increase the focal length of image-forming objective lens, can only be limited to the application of neglecting rink corner or wide-long shot, such as looking in the distance, take photo by plane and remote sensing.
Summary of the invention
In order to overcome above-mentioned defect, the utility model provides a kind of wide visual field volume compact type polarization imaging camera, this polarization imaging camera optics system bulk compactness, and the Stokes polarization parameter information that can take wide field range target object.
The utility model for the technical scheme that solves its technical matters and adopt is: a kind of wide visual field volume compact type polarization imaging camera, comprise object lens, beam splitter, multiple imageing sensor, described object lens are zoom lens, by regulating the focal length of these object lens, can obtain different field of view angle, the diaphragm of its front negative lens group by front end, centre and the rear positive lens groups of rear end form, and last lens minute surface of described object lens is greater than to imageing sensor distance
itsfocal length, is provided with multiple beam splitters between described object lens and imageing sensor, described beam splitter by light beam be divided into the same number of some light beams of imageing sensor after, each light beams is imaged onto in a corresponding imageing sensor by a linear polarizer respectively again.
As further improvement of the utility model, in described imaging camera, be provided with four imageing sensors, three beam splitters between described object lens and imageing sensor, described beam splitter is divided into four tunnels by light beam, and each road light beam is imaged onto in imageing sensor by a linear polarizer.
As further improvement of the utility model, the polarization axle angle of described linear polarizer is followed successively by 0 degree, 45 degree, 90 degree, 135 degree.
As further improvement of the utility model, the front end that is positioned at linear polarizer is provided with optical filter, and the effect of optical filter is that the light signal that sample is given off carries out filtering, only allows single wavelength by also finally being surveyed, and concrete placement location is not limit.
As further improvement of the utility model, the front end that is positioned at linear polarizer is provided with switching device of optical fiber, and different optical filters is installed on described switching device of optical fiber.The effect of switching device of optical fiber is that different optical filters is switched, and allows multiple single wavelengths successively by also finally being surveyed respectively.
As further improvement of the utility model, on the front focal plane of the position of diaphragm rear positive lens groups in object lens.
The beneficial effects of the utility model are: the utility model is by adopting the long back work consisting of front negative lens group and rear positive lens groups apart from object lens, can be the in the situation that of less objective focal length and large imaging field angle, effectively increase object lens to the distance between imageing sensor, can on this space, place multiple beam splitters, polarizer and imageing sensor, effectively reduce the volume of point amplitude measurement-polarized imaging system.
Accompanying drawing explanation
Fig. 1 is schematic perspective view of the present utility model;
Fig. 2 is the light path principle figure that the utility model optical filter is positioned at object lens;
Fig. 3 is that the utility model optical filter is positioned at the light path principle figure before object lens;
Fig. 4 is the schematic diagram that the utility model adopts switching device of optical fiber;
In figure, indicate: 1-object lens; 2-beam splitter; 3-imageing sensor; Negative lens group before 4-; 5-diaphragm; Positive lens groups after 6-; 7-linear polarizer; 8-optical filter; 9-switching device of optical fiber; 10-light beam.
Embodiment
In order to deepen understanding of the present utility model, below in conjunction with embodiment and accompanying drawing, the utility model is described in further detail, and this embodiment only, for explaining the utility model, does not form the restriction to the utility model protection domain.
Fig. 1 shows a kind of embodiment of a kind of wide visual field of the utility model volume compact type polarization imaging camera, comprise object lens 1, beam splitter 2, multiple imageing sensor 3, described object lens 1 are zoom lens, 6 groups of the rear positive lenss of its front negative lens group 4 by front end, middle diaphragm 5 and rear end form, and described object lens 1 last lens minute surface is greater than to imageing sensor distance
itsfocal length, between described object lens 1 and imageing sensor 3, be provided with multiple beam splitters 2, described beam splitter 2 by light beam 10 be divided into the same number of some light beams of imageing sensor after, each light beams is imaged onto in a corresponding imageing sensor 3 by a linear polarizer respectively again, in described imaging camera, be provided with four imageing sensors 3, three beam splitters 2 between described object lens 1 and imageing sensor 3, described beam splitter 2 is divided into four tunnels by light beam, each road light beam is imaged onto in imageing sensor 3 by a linear polarizer 7, the polarization axle angle of described linear polarizer 7 is followed successively by 0 degree, 45 degree, 90 degree, 135 degree, the front end that is positioned at linear polarizer 7 in described light path is provided with optical filter 8, the effect of optical filter is that the light signal that sample is given off carries out filtering, only allow single wavelength by also finally being surveyed, optical filter can be installed on the inside of object lens, as shown in Figure 2, optical filter also can be installed on the front end of object lens 1, as shown in Figure 3, certainly optical filter can be installed on any light path position before linear polarizer,
As shown in Figure 4, the front end that is positioned at linear polarizer 7 is provided with switching device of optical fiber 9, on described switching device of optical fiber 9, different optical filter 8 is installed, the effect of switching device of optical fiber is that different optical filters is switched, allow multiple single wavelengths successively by also finally being surveyed respectively, described diaphragm 5 is located on the front focal plane of rear positive lens groups 6 in object lens.
For the image sensor chip L of certain size
s, the field angle of camera
with objective focal length
be inversely proportional to
Therefore, large field angle be obtained, objective focal length need to be shortened.If long back work is f apart from front negative group of focal length of object lens
1(f
1<0), rear positive lens groups focal length is f
2(f
2>0), the spacing between the principal plane of two groups of front and back is d, according to optical principle, has
Wherein L is rear positive lens groups principal plane to the distance of the focal plane of these object lens, back work distance from.By these two formula, can be found out, for the objective focal length f that gives provisioning request, select suitable f
1and the spacing d between two groups of front and back, can obtain back work distance much larger than focal distance f from L.Therefore can on back work distance, place multiple beam splitters, and for focal length length unrestricted.
The light signal of target object institute radiation by this long back work apart from object lens imaging after, after three beam splitter light splitting, be divided into four tunnels, finally by four different linear polarizer of polarization printing opacity direction, (the polarization axle angle of four linear polarizer is followed successively by 0 degree respectively, 45 degree, 90 degree, 135 degree), converge on four imageing sensors, these four imageing sensors send this four width image simultaneously capturing to computing machine, finally by Computer, are calculated the polarization information of target object institute radiant light signal.
For great majority application, partial poolarized light has three parameters important: light intensity I, linear polarization degree DoLP and polarization angle AoP.
DoLP=
AoP=
S in above two formula
0, S
1and S
2for first three parameter in four parameters of Stokes, be given by the following formula
Wherein I (0
o) for corresponding polarization axis direction be the image intensity of 0 degree linear polarizer, the like I (45
o), I (90
o), I (135
o) to be respectively corresponding polarization axis direction be 45 degree, 90 degree, the image intensity that the imageing sensors of 135 degree linear polarizer collect.
Claims (6)
1. one kind wide visual field volume compact type polarization imaging camera, comprise object lens (1), beam splitter (2), multiple imageing sensor (3), it is characterized in that: described object lens (1) are zoom lens, the diaphragm (5) of its front negative lens group (4) by front end, centre and the rear positive lens (6) of rear end group form, and last lens minute surface of described object lens (1) is greater than to imageing sensor distance
itsfocal length, between described object lens (1) and imageing sensor (3), be provided with multiple beam splitters (2), described beam splitter (2) by light beam (10) be divided into the same number of some light beams of imageing sensor after, each light beams is imaged onto in a corresponding imageing sensor (3) by a linear polarizer (7) respectively again.
2. wide visual field according to claim 1 volume compact type polarization imaging camera, it is characterized in that: in described imaging camera, be provided with four imageing sensors (3), three beam splitters (2) between described object lens (1) and imageing sensor (3), described beam splitter (2) is divided into four tunnels by light beam, and each road light beam is imaged onto in imageing sensor (3) by a linear polarizer (7).
3. wide visual field according to claim 2 volume compact type polarization imaging camera, is characterized in that: the polarization axle angle of described linear polarizer (7) is followed successively by 0 degree, 45 degree, 90 degree, 135 degree.
4. wide visual field according to claim 1 volume compact type polarization imaging camera, is characterized in that: the front end that is positioned at linear polarizer (7) is provided with optical filter (8).
5. wide visual field according to claim 1 volume compact type polarization imaging camera, it is characterized in that: the front end that is positioned at linear polarizer (7) is provided with switching device of optical fiber (9), and different optical filter (8) is installed on described switching device of optical fiber (9).
6. wide visual field according to claim 1 volume compact type polarization imaging camera, is characterized in that: described diaphragm (5) is located on the front focal plane of rear positive lens groups (6) in object lens.
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| CN201320727065.7U CN203587939U (en) | 2013-11-18 | 2013-11-18 | Wide-field compact type polarization imaging camera |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103592808A (en) * | 2013-11-18 | 2014-02-19 | 苏州精创光学仪器有限公司 | Compact polarization imaging camera wide in field of view |
| CN104535187A (en) * | 2014-12-26 | 2015-04-22 | 中国人民解放军理工大学 | Automatic device for compact multi-band and full-polarization imaging |
| CN105511096A (en) * | 2015-12-09 | 2016-04-20 | 大连理工大学 | A single-input four-camera real-time polarization imaging system |
| US11105612B2 (en) | 2019-03-22 | 2021-08-31 | Corning Incorporated | Hybrid systems and methods for characterizing stress in chemically strengthened transparent substrates |
-
2013
- 2013-11-18 CN CN201320727065.7U patent/CN203587939U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103592808A (en) * | 2013-11-18 | 2014-02-19 | 苏州精创光学仪器有限公司 | Compact polarization imaging camera wide in field of view |
| CN104535187A (en) * | 2014-12-26 | 2015-04-22 | 中国人民解放军理工大学 | Automatic device for compact multi-band and full-polarization imaging |
| CN104535187B (en) * | 2014-12-26 | 2016-05-04 | 中国人民解放军理工大学 | A kind of automation equipment of compact multiband full polarization imaging |
| CN105511096A (en) * | 2015-12-09 | 2016-04-20 | 大连理工大学 | A single-input four-camera real-time polarization imaging system |
| US11105612B2 (en) | 2019-03-22 | 2021-08-31 | Corning Incorporated | Hybrid systems and methods for characterizing stress in chemically strengthened transparent substrates |
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| CB03 | Change of inventor or designer information |
Inventor after: Chen Liping Inventor after: Tang Xiang Inventor after: Yan Fei Inventor after: Wang Xudong Inventor before: Shang Xiuxin Inventor before: Chen Liping Inventor before: Yan Fei Inventor before: Wang Xudong |
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Free format text: CORRECT: INVENTOR; FROM: SHANG XIUXIN CHEN LIPING YAN FEI WANG XUDONG TO: CHEN LIPING TANG XIANG YAN FEI WANG XUDONG |
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