CN2569177Y

CN2569177Y - Polarized imaging device

Info

Publication number: CN2569177Y
Application number: CN 02264579
Authority: CN
Inventors: 罗睿智; 乔延利; 洪津; 王乐意; 杨伟锋; 杨世植
Original assignee: Anhui Institute of Optics and Fine Mechanics of CAS
Current assignee: Anhui Institute of Optics and Fine Mechanics of CAS
Priority date: 2002-09-20
Filing date: 2002-09-20
Publication date: 2003-08-27
Anticipated expiration: 2012-09-20

Abstract

The utility model discloses a polarized imaging device. The utility model is formed by that a polarizing sheet (9), a converging lens (5) and a photoelectric detector (3) are orderly arranged on each of three light paths which are collimated in a same scene, and the polarization directions of the three polarizing sheets (9) totally and mutually differ by 60 DEG; the positions of pixels in the scene are correspondingly same, and particularly, a collimating lens (7) and a tripartition prism (8) are orderly connected in series in a light path between the scene and one polarizing sheet (9); a convergent lens (1), a light diaphragm (2) and a light filter (4) are connected in series between the scene and the collimating lens (7), and a plane reflecting mirror (6) is arranged between the tripartition prism (8) and the polarizing sheet (9); the photoelectric detector (3) is a charge coupled device CCD for an area array or a digital camera. The utility model can effectively detects multiple wave bands to a target in any distance, and is particularly suitable for detection by being carried on an aeroplane or a satellite. The utility model can widely be used for obtaining polarizing images of various objects to be measured.

Description

Polarization imaging device

Technical field

The utility model relates to a kind of optical measuring device, especially polarization imaging device.

Background technology

According to obtaining complete polarization information theory, obtain the polarization information of measurement target, should survey same target from three polarization directions at least, in detection process, the state of target and extraneous condition must remain unchanged, and the polarization information that obtains like this is only authentic and valid information.For this reason, people often use many polarimeters to survey same target simultaneously in order to obtain the polarization imaging figure of target to be measured, as the currently used polarizer of the applicant.The polarimeter that it is made of polaroid, convergent lens and charge-coupled device (CCD) three covers is through combining, and wherein, three mutual polarization angle of polaroid all differ 60 degree, and the position of the picture dot in the target to be measured on three CCD is also corresponding identical.During detection, target beam becomes the image that includes its polarization information behind single polaroid, through convergent lens it is projected on the CCD again, and follow-up data processor is with complete polarization image of information integrated one-tenth of three CCD.But, the weak point that this polarizer exists is only can survey resting, be that scene and its distance can only be certain values or be the infinite distance, if the change range finding then must readjust three convergent lenses, simultaneously so that the position of corresponding picture dot on three CCD of determinand transferred coincidence once more, this difficulty of not only adjusting is big, and time-consuming, particularly when aerial survey, also have little time, the data volume of the need subsequent treatment of Yin Faing is also big and complicated therefrom.

Summary of the invention

The technical problems to be solved in the utility model provides a kind of polarization imaging device for overcoming weak point of the prior art.

The technical scheme that is adopted comprises collimating on three light paths with scene and is equipped with polaroid, convergent lens and photodetector successively, polarization direction between said three polaroids all differs 60 degree, it is identical that picture dot in the said scene is positioned at three position correspondences on the photodetector, particularly is serially connected with collimation lens and three fens prisms on the light path between scene and polaroid successively.

As the further improvement of technical scheme, be serially connected with convergent lens, diaphragm and light filter on the light path between described scene and collimation lens successively; The diameter of described convergent lens is more than or equal to 90 millimeters; The aperture of described diaphragm is 10～15 millimeters; Described light filter is the optical filter that is equipped with the polylith different-waveband on the filter wheel of being located on the step motor shaft; Be equipped with plane mirror on the light path between described three minutes prisms and polaroid; Described photodetector is surface array charge-coupled device CCD or digital camera.

Beneficial effect with respect to prior art is, one, the setting of collimation lens and three fens prisms, it can be surveyed far, can survey again closely, can effectively survey the target on any distance, and it is simple and easy to do when regulating, time saving and energy saving, particularly be fit to airborne or spaceborne detection, the data that need to handle are also measured little, simple; Its two, the adverse effect of veiling glare to it both eliminated in the access of convergent lens, diaphragm, reduced the bore of subsequent optical system again, also had the effect of aberration correction, can satisfy the requirement of different-waveband image definition; Its three, the employing of optical filter makes it can carry out the detection of a plurality of wave bands to target to be measured; Its four, select the preposition convergent lens of larger caliber for use, guaranteed that follow-up light beam still has enough big energy; Its five, the use of plane mirror makes its compact conformation, volume little, is convenient to open-air dynamic instrumentation.

Description of drawings

Below in conjunction with accompanying drawing optimal way of the present utility model is described in further detail.

Fig. 1 is a kind of basic structure synoptic diagram of the present utility model.

Embodiment

Referring to Fig. 1, be provided with convergent lens 1, diaphragm 2, light filter 4 and collimation lens 7 successively on the light path that object-scene to be measured and three fens prisms are 8, wherein, the diameter of convergent lens 1 is 95 millimeters, the aperture of diaphragm 2 is 13 millimeters and is positioned at convergent lens 1 and the focus place of collimation lens 7 that light filter 4 is equipped with three optical filters on the filter wheel.All be equipped with plane mirror 6, polaroid 9, convergent lens 5 and photodetector 3 successively on pairing three light paths of three reflectings surface of three fens prisms 8, three polaroids 9 wherein are towards different directions, its mutual polarization direction all differs 60 degree, three convergent lenses 5 all are adjusted to the picture dot in the scene the corresponding same position of the photodetector 3 on its light path respectively, and three photodetectors 3 are selected surface array charge-coupled device CCD for use.

During use, target beam is focused to diaphragm 2 to eliminate veiling glare behind convergent lens 1, behind light filter 4 and collimation lens 7, become the parallel beam of required wave band again, by three fens prisms 8 it is divided into the three-beam of three plane mirrors 6 of directive then, this three-beam becomes the light beam that contains corresponding polarization information respectively behind the polaroid on its light path 9, be focused on the CCD through convergent lens 5 again, so that subsequent treatment becomes required polarization image.

Claims

1, a kind of polarization imaging device, comprise collimating and on three light paths, be equipped with polaroid (9), convergent lens (5) and photodetector (3) successively with scene, polarization direction between said three polaroids (9) all differs 60 degree, the position correspondence that picture dot in the said scene is positioned on three photodetectors (3) is identical, it is characterized in that: be serially connected with collimation lens (7) and three fens prisms (8) on the light path between scene and polaroid (9) successively.

2, device according to claim 1 is characterized in that being serially connected with successively on the light path between scene and collimation lens (7) convergent lens (1), diaphragm (2) and light filter (4).

3, device according to claim 2, the diameter that it is characterized in that convergent lens (1) is more than or equal to 90 millimeters.

4, device according to claim 2, the aperture that it is characterized in that diaphragm (2) is 10～15 millimeters.

5, device according to claim 2 is characterized in that light filter (4) is for being located at the optical filter that is equipped with the polylith different-waveband on the filter wheel on the step motor shaft.

6, device according to claim 1 is characterized in that being equipped with plane mirror (6) on the light path between three fens prisms (8) and polaroid (9).

7, device according to claim 1 is characterized in that photodetector (3) is surface array charge-coupled device CCD or digital camera.