CN102495433A - Scanning method of rotary mirror and galvanometer approximate to in-plane optical imaging - Google Patents
Scanning method of rotary mirror and galvanometer approximate to in-plane optical imaging Download PDFInfo
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- CN102495433A CN102495433A CN2011104037196A CN201110403719A CN102495433A CN 102495433 A CN102495433 A CN 102495433A CN 2011104037196 A CN2011104037196 A CN 2011104037196A CN 201110403719 A CN201110403719 A CN 201110403719A CN 102495433 A CN102495433 A CN 102495433A
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Abstract
The invention relates to an optical imaging scanning mode of an object in a nearly flat region, which comprises a fixed-point rotary mirror type multi-optical imaging system scanning mode that can be used to realize scanning of a fixed optical imaging system by rotating and adjusting a galvanometer or the rotary mirror. According to the method, the problems of definition and the like in scanning an object in the nearly flat or flat region by applying optical imaging are solved by virtue of a mode of scanning optical imaging of an object in the nearly flat region. The method is suitable for optical imaging scanning of the object in the nearly flat region, especially for application of airfield pavement foreign object scanning, so that the scanning accuracy can be improved.
Description
Technical field
The invention belongs to the optical image technology field, relate to the optical imagery scanning detection mode of object in a kind of nearly smooth zone, the optical imagery scan method of object in specifically a kind of nearly smooth zone.
Background technology
Airfield pavement exotic FOD (Foreign Object Debris) gets final product certain external material, chip or the object that can damage aircraft or system.The kind of FOD is quite a lot of, like hard object, soft object, birds, thunder and lightning etc.FOD harm is very serious, and the exotic on the airfield pavement can be easy to be inhaled into engine, causes power failure.Fragment also can be deposited in the mechanical hook-up, influences the normal operation of equipment such as undercarriage, wing flap.FOD not only can wrap up, causes airplane crash and seizes valuable life, but also be accompanied by enormous economic loss.The unplanned engine that changes itself is exactly expensive cost, says nothing of the loss that airliner delay or cancellation bring.According to conservative estimation; The loss that cause because of FOD in the annual whole world is at least at 3,000,000,000-4,000,000,000 dollars; Exotic FOD not only can cause huge direct loss, also can cause airliner delay, abort, close indirect losses such as runway, and indirect loss is at least 4 times of direct loss.
Existing airfield pavement exotic scanning device mainly adopts millimetre-wave radar technology and optical image technology.The millimetre-wave radar technology is exactly through millimeter wave scanning device emission millimeter wave beam scanning airfield pavement; The road face reaches attached to the foreign matter on the road face; Can produce reflected signal after receiving millimeter-wave signal, these signals are mixed by millimeter wave scanister receiver and receive into the mixing ripple, and data handling system is through analysis and processing to mixing ripple signal; After filtering out the earth background angle echo, differentiate the foreign matter on the face of engaging in this profession.Optical image technology is to differentiate road face foreign matter through the mode acquisition scans area image information of optical imagery and through the method for computer software identification.
Summary of the invention
The optical imagery scan method that the purpose of this invention is to provide object in a kind of nearly smooth zone.
Nearly smooth zone of the present invention is to spend smaller or equal to 30 greater than 0 degree with horizontal sextant angle in the zone.
The technical scheme that the present invention solves the problems of the technologies described above is following: in nearly smooth zone, object is adopted the optical imagery scan mode; Comprise many optical imaging systems of fixed point rotary mirror type scan mode; Said optical imaging system comprises video camera, camera lens and light fixture; Said fixed point rotary mirror type is for to fix optical imaging system, realizes scanning thereby make the light in different scanning zone get into optical imaging system one by one through rotation and adjustment galvanometer or tilting mirror.
Further, thus described many optical imaging systems scan mode is to realize accomplishing whole scan tasks through a sector display with the scanning area that many cover optical imaging systems scan respectively from the close-by examples to those far off.
Further, said many optical imaging systems of fixed point rotary mirror type scan mode is that many optical imaging systems are fixed, and makes the light in different scanning zone get into optical imaging system through rotation and adjustment galvanometer or tilting mirror and realizes scanning.
For video acquisition system, the factor that influences scanning step mainly contains two aspects: the one, and the transversal scanning step-length mainly receives the restriction of optical system visual field,
Wherein θ is a field angle of object, and L is the lateral length of image-forming components such as CCD, f
\Focal length for optical system.
Yet the system visual field is by the resolution decision, and after image-forming components such as CCD were selected, the resolution of imaging only depended on the optical system focal distance f
\
So the resolution of selected optical imaging system has determined the size of horizontal step-length.
The 2nd, the longitudinal scanning step-length mainly receives the restriction of the optical system depth of field.The depth of field:
Wherein Δ L is the depth of field, f
\Optical system focal length, D are relative aperture, and L is an object distance, and δ is the size of disc of confusion.
The depth of field changes and changes along with object distance, so the longitudinal scanning step-length is a value that changes to gradually change with object distance.Arranging of each optical imaging system in many optical imaging systems confirmed according to the longitudinal scanning step-length.Therefore the arrangement mode of fixed optics imaging system is confirmed by the longitudinal scanning step-length, changes gradually changing with object distance.
The beneficial effect of the invention is: the optical imagery scan method of object provides a kind of and uses optical imagery to its scan mode that scans to object in the nearly smooth or smooth zone in the nearly smooth zone of the present invention.Scan mode of the present invention is applied to corresponding airfield pavement foreign matter monitoring equipment, 5 millimeters foreign matters of I identification.
Description of drawings
Fig. 1 is fix a point three optical imaging system scanning area cut-open views of many optical imaging systems of rotary mirror type scan mode of the present invention.Among the figure, vertically being divided into four zones, is non-scanning area in video camera x0 wherein, mainly is made up of lawn, equipment installation region, part road surface beyond the curb.X1, x2, three zones of x3 are aimed at three optical imaging systems respectively and are scanned, and first optical imaging system is aimed at the x1 zone and scanned, and second optical imaging system is aimed at the x2 zone and scanned, and the 3rd optical imaging system is aimed at the x3 zone and scanned.。
Fig. 2 is fix a point three optical imaging system scanning area vertical views of many optical imaging systems of rotary mirror type scan mode of the present invention.Among the figure, can find out that L2 is the maximum scan radius of first optical imaging system, L3 is the maximum scan radius of second optical imaging system, and L4 is the maximum scan radius of the 3rd optical imaging system.
Fig. 3 is a sector display process synoptic diagram for fix a point three optical imaging system transversal scanning of many optical imaging systems of rotary mirror type scan mode of the present invention, and O is the video camera present position among the figure, and ∠ AOB, ∠ BOC are adjacent two scanning steps.
Fig. 4 is fix a point three optical imaging system vibration mirror scanning process synoptic diagram of many optical imaging systems of rotary mirror type scan mode of the present invention, and I first optical imaging system, II second optical imaging system, III the 3rd optical imaging system among the figure are represented three cover optical systems; 1 represents galvanometer, and on behalf of imaging len, 3,2 represent image device; A, b, c represent the position of galvanometer.
Fig. 5 is fix a point three optical imaging system rotating mirror scanning process synoptic diagram of many optical imaging systems of rotary mirror type scan mode of the present invention; Among the figure; I first optical imaging system, II second optical imaging system, III the 3rd optical imaging system are represented three cover optical systems; 4 represent tilting mirror, are an isogonism multi-faceted column, and on behalf of imaging len, 3,2 represent image device; D, e, e represent the position of tilting mirror.
Embodiment
Below in conjunction with accompanying drawing scanning process of the present invention and characteristic are described, institute gives an actual example and only is used to explain the present invention, is not to be used to limit scope of the present invention.
Many optical imaging systems of fixed point rotary mirror type scan mode is example with three cover optical imaging systems to the airfield pavement sector scanning that length and width are respectively L, H; As shown in Figure 1; Vertically be divided into four zones; Wherein the zone apart from video camera x0 is non-scanning area, mainly is made up of lawn, equipment installation region, part road surface beyond the curb.X1, x2, three zones of x3 are aimed at three optical imaging systems respectively and are scanned; It is sector display that first optical imaging system aligning x1 laterally scans in the zone; It is sector display that second optical imaging system aligning x2 carries out transversal scanning in the zone, and it is sector display that the 3rd optical imaging system aligning x3 carries out transversal scanning in the zone.As can be seen from Figure 2 L2 is the maximum scan radius of first optical imaging system, and L3 is the maximum scan radius of second optical imaging system, and L4 is the maximum scan radius of the 3rd optical imaging system.The image scanning zone of three kinds of respectively corresponding three optical imaging systems in different shading district among the figure; Optical imaging system only is respectively the rectangular scanning zone collection vision signal of L and H with regard to length and width; Video acquisition is not done in zone beyond the rectangular area, and the scanning area total area is L * H.Among Fig. 3 ∠ OAB pairing fan-shaped be a scanning step, ∠ OBC is next step-length.
Fig. 4 is the scanning synoptic diagram with the galvanometer regulative mode, and Fig. 5 is the scanning synoptic diagram with the tilting mirror regulative mode.I, II, III represent three cover optical systems among Fig. 4; 1 represents galvanometer, and on behalf of imaging len, 3,2 represent image device; A, b, c represent the position of galvanometer.I, II, III represent three cover optical systems among Fig. 5; 4 represent tilting mirror, are an isogonism multi-faceted column, and on behalf of imaging len, 3,2 represent image device; D, e, f represent the position of tilting mirror.The purpose of two kinds of regulative modes of galvanometer and tilting mirror is through the position of regulating galvanometer and tilting mirror and makes the light in different transversal scanning zone get into optical imaging system, thereby under the fixed situation of optical imaging system, realizes the scanning to whole scanning areas through above-mentioned two kinds of regulative modes.
The above is merely preferred embodiment of the present invention, and is in order to restriction the present invention, not all within spirit of the present invention and principle, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. the optical imagery scan method of object in the nearly smooth zone; It is characterized in that adopting many optical imageries of fixed point rotary mirror type scan mode; To scanning with optical imaging system greater than the object of 0 degree with horizontal sextant angle in the zone smaller or equal to 30 degree; Said optical imaging system comprises video camera, camera lens and light fixture; Said fixed point rotary mirror type is for to fix optical imaging system, realizes scanning thereby make the light in different scanning zone get into optical imaging system one by one through rotation and adjustment galvanometer or tilting mirror.
2. the optical imagery scan method of object in the nearly smooth zone according to claim 1, thus it is characterized in that described many optical imageries scan mode is to realize accomplishing whole scan tasks through a sector display with the scanning area that many cover optical imaging systems scan respectively from the close-by examples to those far off.
3. the optical imagery scan method of object in the nearly smooth zone according to claim 2; It is characterized in that said many optical imageries of fixed point rotary mirror type scan mode is that many optical imaging systems are fixed, make the light in different scanning zone get into optical imaging system through rotation and adjustment galvanometer (1) or tilting mirror (4) and realize that transversal scanning is sector display.
4. the optical imagery scan method of object in the nearly smooth zone according to claim 3 is characterized in that the size of optical imaging system transversal scanning step-length is confirmed by the resolution of selected optical imaging system.
5. the optical imagery scan method of object in the nearly smooth zone according to claim 3; The arrangement mode that it is characterized in that the fixed optics imaging system is confirmed by the longitudinal scanning step-length; The longitudinal scanning step-length is a value that gradually changes with the object distance variation, and arranging of optical imaging system also is to change with object distance to gradually change.
6. the optical imagery scan method of object in the nearly smooth zone according to claim 3; It is characterized in that it is sector display that first optical imaging system aligning x1 zone is laterally scanned; It is sector display that second optical imaging system aligning x2 carries out transversal scanning in the zone, and it is sector display that the 3rd optical imaging system aligning x3 carries out transversal scanning in the zone; The maximum scan radius of first optical imaging system is L2, and the maximum scan radius of second optical imaging system is L3, and the maximum scan radius of the 3rd optical imaging system is L4; Optical imaging system only is respectively the rectangular scanning zone collection vision signal of L and H with regard to length and width, the scanning area total area is L * H, and scanning step is the corresponding sector region of ∠ OAB, and ∠ OBC is next step-length.
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| CN 201110403719 CN102495433B (en) | 2011-09-30 | 2011-12-07 | Rotary mirror with approximate in-plane optical imaging and galvanometer scanning method |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101852869A (en) * | 2010-05-18 | 2010-10-06 | 中国民航大学 | Airfield runway foreign object detection system |
| CN201754190U (en) * | 2010-03-09 | 2011-03-02 | 高国华 | Laser scanning, detecting and imaging system for road surface |
| JP2011185836A (en) * | 2010-03-10 | 2011-09-22 | Mitsubishi Electric Corp | Foreign matter detector |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201754190U (en) * | 2010-03-09 | 2011-03-02 | 高国华 | Laser scanning, detecting and imaging system for road surface |
| JP2011185836A (en) * | 2010-03-10 | 2011-09-22 | Mitsubishi Electric Corp | Foreign matter detector |
| CN101852869A (en) * | 2010-05-18 | 2010-10-06 | 中国民航大学 | Airfield runway foreign object detection system |
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