CN103592808A - Compact polarization imaging camera wide in field of view - Google Patents
Compact polarization imaging camera wide in field of view Download PDFInfo
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- CN103592808A CN103592808A CN201310576075.XA CN201310576075A CN103592808A CN 103592808 A CN103592808 A CN 103592808A CN 201310576075 A CN201310576075 A CN 201310576075A CN 103592808 A CN103592808 A CN 103592808A
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Abstract
The invention discloses a compact polarization imaging camera wide in field of view. The distance between the last lens face of an object lens and each image sensor is larger than the focal distance of the object lens. A plurality of beam splitters are arranged between the object lens and the image sensors. After a light beam is divided into a plurality of light beams, each light beam is imaged to one corresponding image sensor through one linear polarizer, wherein the number of the light beams equals that of the image sensors. Because a long rear working distance object lens is formed by a front negative lens assembly and a rear positive lens assembly, under the conditions of the small focal distance of the object lens and a large imaging field angle, the distance between the object lens and each image sensor can be effectively increased, the beam splitters, a plurality of polarization elements and the image sensors can be placed on the space, and the size of a splitting type amplitude measurement-polarization imaging system can be effectively reduced.
Description
Technical field
The present invention 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, compare as Detection Techniques with traditional light intensity map, can obtain the parameters such as polarization intensity, degree of polarization, polarization angle and 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 minute 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 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 invention provides a kind of wide visual field volume compact type polarization imaging camera, this polarization imaging camera optics system bulk is compact, and the Stokes polarization parameter information that can take wide field range target object.
The present invention 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, a plurality of 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 a plurality of 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 a further improvement on the present invention, 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 a further improvement on the present invention, the polarization axle angle of described linear polarizer is followed successively by 0 degree, 45 degree, 90 degree, 135 degree.
As a further improvement on the present invention, the front end that is positioned at linear polarizer in described light path 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 a further improvement on the present invention, the front end that is positioned at linear polarizer in described light path 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 a plurality of single wavelengths successively by also finally being surveyed respectively.
As a further improvement on the present invention, on the front focal plane of the position of diaphragm rear positive lens groups in object lens.
The invention has the beneficial effects as follows: the present invention 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 a plurality of beam splitters, polarizer and imageing sensor, effectively reduce the volume of minute amplitude measurement-polarized imaging system.
Accompanying drawing explanation
Fig. 1 is schematic perspective view of the present invention;
Fig. 2 is the light path principle figure that optical filter of the present invention is positioned at object lens;
Fig. 3 is that optical filter of the present invention is positioned at the light path principle figure before object lens;
Fig. 4 is the schematic diagram that the present invention 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 the understanding of the present invention, below in conjunction with embodiment and accompanying drawing, the invention will be further described, and this embodiment only, for explaining the present invention, does not form limiting the scope of the present invention.
Fig. 1 shows a kind of embodiment of a kind of wide visual field of the present invention volume compact type polarization imaging camera, comprise object lens 1, beam splitter 2, a plurality of 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 3 distance
itsfocal length, between described object lens 1 and imageing sensor 3, be provided with a plurality of beam splitters 2, described beam splitter 2 by light beam 10 be divided into the same number of some light beams of imageing sensor 3 after, each light beams is imaged onto in a corresponding imageing sensor 3 by a linear polarizer 7 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 10, each road light beam 10 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 8 is that the light signal that sample is given off carries out filtering, only allow single wavelength by also finally being surveyed, optical filter 8 can be installed on the inside of object lens, as shown in Figure 2, optical filter 8 also can be installed on the front end of object lens 1, as shown in Figure 3, certainly optical filter 8 can be installed on any light path position before linear polarizer 7, as shown in Figure 4, the front end that is positioned at linear polarizer 7 in described light path 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 9 is that different optical filter 8 is switched, allow a plurality of 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.
Image sensor chip L for 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, the objective focal length f for giving provisioning request, selects 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 a plurality of 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
2first three parameter in four parameters of Stokes, is 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), a plurality of 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 a plurality of beam splitters (2), described beam splitter (2) by light beam (10) be divided into the same number of some light beams of imageing sensor (3) (10) after, each light beams (10) 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) in described light path 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) in described light path 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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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104298051A (en) * | 2014-11-04 | 2015-01-21 | 苏州精创光学仪器有限公司 | Light filter switching device for polarization imaging camera |
| CN105021284A (en) * | 2015-06-29 | 2015-11-04 | 中国人民解放军陆军军官学院 | System and method for rapidly measuring space polarization information of random space vector polarized light |
| CN105511096A (en) * | 2015-12-09 | 2016-04-20 | 大连理工大学 | A single-input four-camera real-time polarization imaging system |
| CN108332850A (en) * | 2018-03-23 | 2018-07-27 | 广东建元和安科技发展有限公司 | A kind of the test system and its test method of laser transmission characteristic under low contrast environment |
| CN108873366A (en) * | 2018-06-27 | 2018-11-23 | 河海大学 | Multi-band Polarization light splitting and integrated approach and system |
| CN110166675A (en) * | 2019-06-14 | 2019-08-23 | 深圳扑浪创新科技有限公司 | Synchronous shooting device and sync pulse jamming method |
| US10539763B2 (en) | 2016-03-31 | 2020-01-21 | Sony Corporation | Optical system, electronic device, camera, method and computer program |
| CN112345078A (en) * | 2020-10-27 | 2021-02-09 | 衡阳市智谷科技发展有限公司 | Polarization measurement system based on light wave polarization state |
| CN112470071A (en) * | 2020-02-28 | 2021-03-09 | 深圳市大疆创新科技有限公司 | Three-light camera, tripod head structure and mobile platform |
| WO2021243088A1 (en) * | 2020-05-27 | 2021-12-02 | Boston Polarimetrics, Inc. | Multi-aperture polarization optical systems using beam splitters |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104298051A (en) * | 2014-11-04 | 2015-01-21 | 苏州精创光学仪器有限公司 | Light filter switching device for polarization imaging camera |
| CN105021284A (en) * | 2015-06-29 | 2015-11-04 | 中国人民解放军陆军军官学院 | System and method for rapidly measuring space polarization information of random space vector polarized light |
| CN105511096A (en) * | 2015-12-09 | 2016-04-20 | 大连理工大学 | A single-input four-camera real-time polarization imaging system |
| US10539763B2 (en) | 2016-03-31 | 2020-01-21 | Sony Corporation | Optical system, electronic device, camera, method and computer program |
| CN108332850A (en) * | 2018-03-23 | 2018-07-27 | 广东建元和安科技发展有限公司 | A kind of the test system and its test method of laser transmission characteristic under low contrast environment |
| CN108873366A (en) * | 2018-06-27 | 2018-11-23 | 河海大学 | Multi-band Polarization light splitting and integrated approach and system |
| CN110166675A (en) * | 2019-06-14 | 2019-08-23 | 深圳扑浪创新科技有限公司 | Synchronous shooting device and sync pulse jamming method |
| CN110166675B (en) * | 2019-06-14 | 2024-02-13 | 深圳扑浪创新科技有限公司 | Synchronous shooting device and synchronous shooting method |
| CN112470071A (en) * | 2020-02-28 | 2021-03-09 | 深圳市大疆创新科技有限公司 | Three-light camera, tripod head structure and mobile platform |
| WO2021243088A1 (en) * | 2020-05-27 | 2021-12-02 | Boston Polarimetrics, Inc. | Multi-aperture polarization optical systems using beam splitters |
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| CN112345078A (en) * | 2020-10-27 | 2021-02-09 | 衡阳市智谷科技发展有限公司 | Polarization measurement system based on light wave polarization state |
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