CN106226327B - A kind of cambered surface external surface of objects defect inspection method and system - Google Patents
A kind of cambered surface external surface of objects defect inspection method and system Download PDFInfo
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- CN106226327B CN106226327B CN201610779961.6A CN201610779961A CN106226327B CN 106226327 B CN106226327 B CN 106226327B CN 201610779961 A CN201610779961 A CN 201610779961A CN 106226327 B CN106226327 B CN 106226327B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/8806—Specially adapted optical and illumination features
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
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Abstract
The present invention relates to a kind of cambered surface external surface of objects defect inspection method and systems, specifically, the cambered surface of cambered surface object is placed within the focus of concave mirror, and illumination is provided for detecting system by light source, imaging amplification is carried out to the cambered surface of cambered surface object using concave mirror, and the Position Design of the cambered surface by concave mirror, image collecting device and cambered surface object, the picture of tested cambered surface is converted makes image acquisition device be tested the virtual image of the cambered surface in concave mirror to suitable angle.Due to being tested cambered surface in the virtual image that concave mirror imaging is amplification, according to image-forming principle, the curvature of the virtual image is less than the curvature of tested cambered surface, and the arc of the virtual image the arc institute of tested cambered surface is less than to central angle to central angle, so using cambered surface external surface of objects defect inspection method provided in this embodiment, the imaging edge compression problem of image collecting device can be mitigated.
Description
Technical field
The present invention relates to Electrooptical devices detection technique field more particularly to a kind of cambered surface external surface of objects defects detection sides
Method and system.
Background technology
In the industrial production, the defects of there is production defect (such as pit, protrusion) due to the outer surface of product or scratch,
Therefore, it is guarantee product quality, generally use industrial camera carries out the outer surface of product to adopt figure detection, and outer surface is existed
The product of defect pick picking.
In the prior art, many equipment are to pursue aesthetic appearance and hold comfort, the products such as shell and screen
Corner can be designed to the cambered surface with certain radian.Since the depth of field of traditional camera lens is limited, so to the arc of object
When face carries out adopting figure, all the points in cambered surface can not be imaged on same focusing plane by camera, and then be caused in entire cambered surface
In the part imaging clearly in focusing plane, the part imaging other than focal plane is unintelligible.For these reasons, the prior art
In, the cambered surface of cambered surface product is carried out adopting figure usually using telecentric lens, has the characteristics that the ultra-wide depth of field using telecentric lens, is come
Ensure that the various pieces of cambered surface can blur-free imaging.
But either conventional lenses or greatly depth of field camera lens, lens focusing face is plane, so leading to cambered surface
Imaging is compressed, also, when the arc chord angle of cambered surface is bigger or its circular arc curvature of the cambered surface of same arc length is bigger,
Imaging compression situation close to cambered surface edge is more serious.So above-mentioned imaging compression can make the actual size of cambered surface and at film size
Face size does not correspond to, and causes to get the wrong sow by the ear to the flaw size in cambered surface, and defect is not easy to be identified, so cause accuracy of detection compared with
It is low.In addition, when the arc sizes of product are bigger, the big depth of field camera lens of big clear aperture need to be customized, price is usually higher,
And then lead to that increased production cost.
Invention content
To overcome the problems in correlation technique, the present invention provide a kind of cambered surface external surface of objects defect inspection method and
System.
According to a first aspect of the embodiments of the present invention, a kind of cambered surface external surface of objects defect detecting system is provided, including：
Light source, for providing illumination for the detecting system, the cambered surface of cambered surface object is located at the irradiation area of the light source
In range；
Concave mirror, for the cambered surface stretch be imaged, the cambered surface be located at the focus of the concave mirror with
Interior, the radius of curvature of the cambered surface is less than the radius of curvature of the concave mirror, and the arc length of the cambered surface is less than or equal to institute
The arc length of concave mirror is stated, there is certain angle between the optical axis of the concave mirror and the central axes of the cambered surface；
Image collecting device, for acquiring cambered surface imaging in the concave mirror, described image acquisition
There is certain angle between the optical axis of device and the central axes of the cambered surface.
Preferably, the concave mirror is made of two or more concave reflection mirror units, wherein：
The curvature of concave surface mirror unit is with the concave reflection mirror unit and the cambered surface in the concave mirror
Between spacing increase and gradually decrease；
Point in the cambered surface is located in the focal range for the concave reflection mirror unit being imaged to the point.
Preferably, the light source is concave surface annular light source, and the concave surface light-emitting surface of the concave surface annular light source is towards the arc
Face.
Preferably, the light source is made of three concave surface annular light sources, wherein：
Three concave surface annular light sources are arranged along the circular arc direction of the cambered surface, are respectively used to irradiate the two of the cambered surface
Edge area and central area.
Preferably, the radius of curvature of the concave mirror is 3~20 times of the cambered surface radius of curvature.
Preferably, the angle between the optical axis of the concave mirror and the central axes of the cambered surface is 15 °~50 °, institute
State 65 °~100 ° of angle between the optical axis of image collecting device and the central axes of the cambered surface.
Preferably, the angle number of degrees between the optical axis of the concave mirror and the central axes of the cambered surface be 30 °~
45 °, 85 °~100 ° of the angle between the optical axis of described image harvester and the central axes of the cambered surface.
Preferably, the concave mirror is arranged by connector on described image harvester.
According to a second aspect of the embodiments of the present invention, a kind of cambered surface external surface of objects defect inspection method is provided, this is utilized
Any detecting system of inventive embodiments first aspect, including：
The cambered surface of cambered surface object is irradiated using light source, the cambered surface is located within the scope of the irradiation area of the light source；
The cambered surface is imaged using concave mirror, wherein picture of the cambered surface in the concave mirror
For the virtual image of amplification；
Using cambered surface described in image acquisition device, the formed virtual image in the concave mirror, obtains the cambered surface
Detection image.
Preferably, the formed virtual image in the concave mirror using cambered surface described in image acquisition device, including：
Cambered surface formed virtual image in the concave mirror is shot using area array cameras, or utilizes line-scan digital camera
Scan the cambered surface formed virtual image in the concave mirror.
By above technical scheme as it can be seen that a kind of cambered surface external surface of objects defect inspection method provided in an embodiment of the present invention and
The cambered surface of cambered surface object is placed within the focus of concave mirror by system, and provides illumination by light source for detecting system, profit
Imaging amplification is carried out to the cambered surface of cambered surface object with concave mirror, and passes through concave mirror, image collecting device and arc
The Position Design of the cambered surface of face object converts the picture of tested cambered surface to suitable angle, makes image acquisition device cambered surface
Picture in concave mirror.Be the virtual image amplified due to being tested cambered surface in concave mirror imaging, according to image-forming principle,
The curvature of the virtual image is less than the curvature of tested cambered surface, and the arc of virtual image institute is less than the arc of tested cambered surface to circle to central angle
Heart angle, the flattening so the relatively tested cambered surface of tested cambered surface formed virtual image in concavees lens is stretched, and then mitigate Image Acquisition
The imaging edge compression problem of device.
It should be understood that above general description and following detailed description is only exemplary and explanatory, not
It can the limitation present invention.
Description of the drawings
The drawings herein are incorporated into the specification and forms part of this specification, and shows the implementation for meeting the present invention
Example, and be used to explain the principle of the present invention together with specification.
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, for those of ordinary skill in the art
Speech, without having to pay creative labor, other drawings may also be obtained based on these drawings.
Fig. 1 is that a kind of first basic structure of cambered surface external surface of objects defect detecting system provided in an embodiment of the present invention is shown
It is intended to；
Fig. 2 is that a kind of second basic structure of cambered surface external surface of objects defect detecting system provided in an embodiment of the present invention is shown
It is intended to；
Fig. 3 is a kind of flow diagram of cambered surface external surface of objects defect inspection method provided in an embodiment of the present invention.
Specific implementation mode
Example embodiments are described in detail here, and the example is illustrated in the accompanying drawings.Following description is related to
When attached drawing, unless otherwise indicated, the same numbers in different drawings indicate the same or similar elements.Following exemplary embodiment
Described in embodiment do not represent and the consistent all embodiments of the present invention.On the contrary, they be only with it is such as appended
The example of the consistent device and method of some aspects being described in detail in claims, of the invention.
The embodiment of the present invention utilize speculum amplification image-forming principle, using concave mirror by the cambered surface of cambered surface object into
Row amplification imaging makes the relatively tested cambered surface curvature of tested cambered surface imaging in concave mirror reduce, and then mitigates image and adopt
The imaging edge compression problem of acquisition means.
It is that the first of a kind of cambered surface external surface of objects defect detecting system provided in an embodiment of the present invention is basic referring to Fig. 1
Structural schematic diagram, the system include light source, concave mirror 2 and image collecting device 3.
Specifically, light source is used to provide illumination for the detecting system, the cambered surface 41 of tested cambered surface object 4 is located at the light
Within the scope of the irradiation area in source, the present embodiment is illustrated by taking right angle cambered surface object as an example, i.e. the corresponding central angle of its cambered surface is
For 90 °, but be not limited to the face type, can also be other cambered surface objects at any angle, and to off-gauge elliptic arc,
Curve arc etc..Meanwhile concave mirror 2 is also not limited to the concave mirror 2 of spherical surface, may be designed in other face types,
It and can also be to be made of multiple concave reflection mirror units, wherein when concave mirror is by multiple concave reflection mirror unit groups
Cheng Shi, since there are one focuses for each concave reflection mirror unit, so its focus is made of multiple sub- focuses.
Concave mirror 2 is used to stretch cambered surface 41 and be imaged, wherein amplifies image-forming condition, cambered surface 41 according to speculum
Within the focus of concave mirror 2, in this way, the imaging in concave mirror 2 of cambered surface 41 is just the virtual image of upright amplification.
According to the surface structure feature of cambered surface 41, the spacing between the point and concave mirror of the different location in cambered surface 41
And differ, the focus to make all different location points in cambered surface 41 be in concave mirror 2 (it is empty to meet into amplification
Slice part), so the radius of curvature of cambered surface 41 is less than the radius of curvature of concave mirror 2 in the present embodiment；Meanwhile in order to make arc
Face 41 can in concave mirror 2 can complete imaging, and the arc length of cambered surface 41 be less than or equal to concave mirror arc length.
To enable the imaging in concave mirror 2 of cambered surface 41 to be collected by image collecting device 3, concave mirror
There is certain angle between 2 optical axis and the central axes of cambered surface 41.
Image collecting device 3 is for acquiring the imaging in concave mirror 2 of cambered surface 41, likewise, image collector
Setting also has certain angle between 3 optical axis and the central axes of cambered surface.
It is that the second of a kind of cambered surface external surface of objects defect detecting system provided in an embodiment of the present invention is basic referring to Fig. 2
Structural schematic diagram, it is contemplated that system components are easy to arrangement property, the optical axis of concave mirror 2 and cambered surface 41 in the present embodiment
Angle theta 1 between central axes is 15 °~50 °, the angle theta 2 between the optical axis and the central axes of cambered surface 41 of image collecting device 3
It is 65 °~100 °, corresponds to the right angle cambered surface object in the present embodiment, the optical axis of concave mirror 2 and tested cambered surface object 4
Vertical edges (Y-axis) angle be 15 °~50 °, the vertical edges (Y-axis) of the optical axis of image collecting device 3 and tested cambered surface object 4
Angle be 50 °~85 °.
Further, for make system arrangement it is more compact and meanwhile ensure acquire image effect, the light of concave mirror 2
The angle number of degrees between axis and the central axes of cambered surface 41 are 30 °~45 °, the axis of the optical axis and cambered surface 41 of image collecting device 3
85 °~100 ° of angle between line, corresponding right angle cambered surface object in the present embodiment, the optical axis of concave mirror 2 with it is tested
The angle of the vertical edges (Y-axis) of cambered surface object 4 is 10 °~25 °, the optical axis of image collecting device 3 hangs down with tested cambered surface object 4
The angle of straight flange (Y-axis) is 70 °~85 °.
In the present embodiment, due to having certain angle, institute between the optical axis and the central axes of cambered surface 41 of concave mirror 2
It is different with the spacing between the both ends of cambered surface and concave mirror 2, according to concave mirror imaging formula：
In formula (1), u is distance of object distance, the i.e. object to concave mirror vertex, and v is image distance, i.e. imaging to recessed
The distance on face speculum vertex, f are the focal length on concave mirror vertex, and R is the radius of curvature of concave mirror, concave mirror
Focal length and the relationship of its radius of curvature be
Meanwhile the vertical axis magnifying power formula of concave mirror imaging：
According to formula (1) and (2), cambered surface can be obtained closer to the focus of concave mirror, magnifying power is bigger, formed
The virtual image is also bigger, so the spacing between the both ends of cambered surface and concave mirror 2 is different, cambered surface 41 can be caused in concave mirror
Imaging is asymmetric in 2, and difficulty is brought to subsequent image analysis.
To solve the above-mentioned problems, in the present embodiment, concave mirror 2 is designed as by two or more concave surfaces
Mirror unit is spliced to form, wherein the curvature of concave surface mirror unit is with the concave reflection mirror unit in concave mirror 2
The increase of spacing between cambered surface and gradually decrease, i.e., the radius of curvature of concave surface mirror unit is with this in concave mirror 2
The increase of spacing between concave reflection mirror unit and cambered surface and gradually increase, each point of cambered surface 41 also it is corresponding be located at it is imaged
Concave reflection mirror unit focal range in, and then can make up above-mentioned because of position and concave mirror different in cambered surface 41
The different caused asymmetric problems of imaging of spacing between 2, are finally reached the more consistent effect of entire cambered surface magnifying power.
It should be noted that it can also be one that each concave reflection mirror unit, which can be independent structure, in concave mirror 2
Molding structure, the present embodiment are not specifically limited herein.
Further, since the focal length of concave mirror and the relationship of its radius of curvature areSo concave reflection
The radius of curvature of mirror 2 is bigger, its corresponding focal length is bigger.According to above-mentioned analysis, to make cambered surface 41 more lean on the coke of concave mirror 2
Point, to obtain the magnifying power of bigger, the radius of curvature of concave mirror 2 is bigger, the spacing between cambered surface 41 and concave mirror 2
Also bigger, whole system the space occupied can also become larger, so being saving system occupied space, should meet image-forming condition
Under, the radius of curvature of concave mirror 2 is designed as small as possible.
Meanwhile according to imaging formula (1) and (2), the identical condition of spacing between cambered surface 41 and concave mirror 2
Under, the radius of curvature of concave mirror 2 is bigger, and the vertical axis magnifying power of concave mirror imaging is bigger.
Consider above-mentioned two factor, in the present embodiment, it is bent that the radius of curvature of concave mirror 2 is designed as cambered surface 41
3~20 times of rate radius.
Can not be selectively system light filling since the light that the light source of planar structure is launched more dissipates, so
Light source design is concave surface annular light source by the present embodiment, while the concave surface light-emitting surface of concave surface annular light source is towards cambered surface 41.It utilizes
Light can preferably be reflected into image collecting device 3 by concave surface annular light source, can preferably be shown the defect on 41 surface of cambered surface
Come.
In conjunction with the flexure plane type feature of cambered surface, to make all the points in cambered surface 41 that can be illuminated uniformly, Yi Jigeng
Facilitate the arrangement of system and device, as shown in Figure 1, light source is made of three concave surface annular light sources in the present embodiment, respectively first
Concave surface annular light source 1, the second concave surface annular light source 2 and third concave surface annular light source 3, three concave surface annular light sources are described in
The circular arc direction of cambered surface arranges, and is respectively used to irradiate the both sides of the edge region of the cambered surface and central area, further, above-mentioned
Three concave surface annular light sources can also be made of two or more concave surface annular light source units.
In alternatively possible realization method provided in an embodiment of the present invention, concave mirror 2 can also pass through connection
Part be arranged on described image harvester, select suitable image sensor size, it can be achieved that cambered surface object it is Polaroid,
Detection efficiency is improved, equipment complexity is reduced.
Using above system, the present embodiment additionally provides a kind of cambered surface external surface of objects defect inspection method, and Fig. 3 is this hair
A kind of flow diagram for cambered surface external surface of objects defect inspection method that bright embodiment provides, the method specifically includes as follows
Step：
S110；The cambered surface of cambered surface object is irradiated using light source, the cambered surface is located within the scope of the irradiation area of the light source.
It is detected cambered surface specifically, being irradiated using light source, so that enough light is reflected into image collecting device, image is made to adopt
Acquisition means can collect more clearly image.
S120：The cambered surface is imaged using concave mirror, wherein the cambered surface is in the concave mirror
Picture be amplification the virtual image.
Specifically, being arranged tested cambered surface in the focal range of concave mirror, according to mirror imager condition, it is tested
Cambered surface can be at the virtual image of amplification in concave mirror.
Wherein, it is imaged caused by the spacing difference between position different in cambered surface and concave mirror to make up to state
Asymmetric problem, in the present embodiment, concave mirror is made of multiple concave reflection mirror units, and concave mirror concave
The radius of curvature of face mirror unit gradually increases with the increase of spacing between the concave reflection mirror unit and tested cambered surface,
Cambered surface is imaged by multiple concave reflection mirror units, each point of same tested cambered surface is also corresponding anti-positioned at each concave surface
It penetrates in the focal range of mirror unit.
At the same time it can also according to be tested cambered surface in concave mirror institute at the virtual image amplification factor requirement and the virtual image
Curvature requirement, to tested position relationship between cambered surface and concave mirror and the radius of curvature to concave mirror, face
Type etc. is designed.
S130：Using cambered surface described in image acquisition device, the formed virtual image in the concave mirror, obtains institute
State the detection image of cambered surface.
Wherein, according to the structure of tested cambered surface difference, the tested cambered surface of different image acquisition devices may be used and exist
The formed virtual image in concave mirror can utilize line-scan digital camera scanning to scan frame by frame for example, when the length of cambered surface object is longer
Then tested cambered surface formed virtual image in concave mirror spat subsequent processing and obtains the complete image for being tested cambered surface；Work as arc
When face object is shorter, then it can directly utilize area array cameras to shoot and be tested cambered surface formed void in the concave mirror
Picture.
By above technical scheme as it can be seen that a kind of cambered surface external surface of objects defect inspection method of present invention offer and system, are incited somebody to action
The cambered surface of cambered surface object is placed within the focus of concave mirror, and provides illumination by light source for detecting system, utilizes concave surface
Speculum carries out imaging amplification to the cambered surface of cambered surface object, then, passes through concave mirror, image collecting device and cambered surface object
The Position Design of the cambered surface of body converts the picture of tested cambered surface to suitable angle, makes image acquisition device cambered surface recessed
Picture in the speculum of face.
At the same time it can also according to demand to tested position relationship between cambered surface and concave mirror and to concave surface
Radius of curvature, face type of speculum etc. are designed, and may be implemented have different degrees of put to tested cambered surface imaging in this way
It is big to stretch, for example, tested cambered surface imaging in concave mirror is made to be plane.
According to first-order theory, the vertical axis magnifying power of image is:β=y '/y=- (f/x), wherein f is concave mirror focal length,
X is distance of the cambered surface to focus, and since tested cambered surface is located within the focus of concave mirror, f is more than x, so cambered surface
Vertical axis magnifying power be more than 1, simultaneously as image angular magnification be the inverse of axis magnifying power of hanging down, so the angle of tested surface is amplified
Rate is less than 1, and therefore, tested cambered surface is in the virtual image that concave mirror imaging is amplification, also, the curvature of the virtual image is less than quilt
Survey the curvature of cambered surface, the arc of virtual image institute is less than the arc institute of tested cambered surface to central angle to central angle, and then tested cambered surface process
After concave mirror amplification imaging, the imaging edge compression problem of image collecting device can be mitigated.
In addition, the present embodiment additionally provides the structure that concave mirror is formed by concave mirror unit spliced, by recessed
The face type design of face mirror unit, changes the image space for the different piece for being tested cambered surface, makes circular arc correspondence of the institute at the virtual image
The corresponding rise of the relatively tested cambered surface of rise reduce, and then institute is made to be stretched flattening at the relatively tested cambered surface of the virtual image, so adopting
With common lens to the virtual image process Image Acquisition, can so that tested cambered surface correspond to the various pieces of the virtual image can clearly at
Therefore picture can reduce production cost in the case where ensureing detection result.
Those skilled in the art will readily occur to its of the present invention after considering specification and putting into practice the invention invented here
Its embodiment.This application is intended to cover the present invention any variations, uses, or adaptations, these modifications, purposes or
Person's adaptive change follows the general principle of the present invention and includes the common knowledge in the art that the present invention does not invent
Or conventional techniques.The description and examples are only to be considered as illustrative, and true scope and spirit of the invention are by following
Claim is pointed out.
It should be understood that the invention is not limited in the precision architectures for being described above and being shown in the accompanying drawings, and
And various modifications and changes may be made without departing from the scope thereof.The scope of the present invention is limited only by the attached claims.
Claims (10)
1. a kind of cambered surface external surface of objects defect detecting system, including light source, the light source for the detecting system for providing
Illumination, which is characterized in that further include：
The cambered surface (41) of cambered surface object (4), the cambered surface object (4) is located within the scope of the irradiation area of the light source；
Concave mirror (2), is imaged for being stretched to the cambered surface (41), and the cambered surface (41) is located at the concave mirror
(2) within focus, the radius of curvature of the cambered surface (41) is less than the radius of curvature of the concave mirror (2), the cambered surface
(41) arc length is less than or equal to the arc length of the concave mirror (2), the optical axis of the concave mirror (2) and the cambered surface
(41) there is certain angle between central axes；
Image collecting device (3), for acquiring the cambered surface (41) imaging, figure in the concave mirror (2)
There is certain angle between the optical axis and the central axes of the cambered surface (41) of picture harvester (3).
2. cambered surface external surface of objects defect detecting system according to claim 1, which is characterized in that the concave mirror
(2) it is made of two or more concave reflection mirror units, wherein：
The curvature of concave surface mirror unit is with the concave reflection mirror unit and the cambered surface in the concave mirror (2)
(41) increase of spacing between and gradually decrease；
Point in the cambered surface (41) is located in the focal range for the concave reflection mirror unit being imaged to the point.
3. cambered surface external surface of objects defect detecting system according to claim 1, which is characterized in that the light source is concave surface ring
Shape light source, the concave surface light-emitting surface of the concave surface annular light source is towards the cambered surface (41).
4. cambered surface external surface of objects defect detecting system according to claim 1, which is characterized in that the light source is recessed by three
Face annular light source composition, wherein：
Three concave surface annular light sources are arranged along the circular arc direction of the cambered surface (41), are respectively used to irradiate the cambered surface (41)
Both sides of the edge region and central area.
5. cambered surface external surface of objects defect detecting system according to claim 1, which is characterized in that the concave mirror
(2) radius of curvature is 3~20 times of the cambered surface (41) radius of curvature.
6. cambered surface external surface of objects defect detecting system according to claim 1, which is characterized in that the concave mirror
(2) angle between optical axis and the central axes of the cambered surface (41) is 15 °~50 °, the optical axis of described image harvester (3)
65 °~100 ° of angle between the central axes of the cambered surface (41).
7. cambered surface external surface of objects defect detecting system according to claim 1, which is characterized in that the concave mirror
(2) the angle number of degrees between optical axis and the central axes of the cambered surface (41) are 30 °~45 °, described image harvester (3)
85 °~100 ° of angle between optical axis and the central axes of the cambered surface (41).
8. cambered surface external surface of objects defect detecting system according to claim 1, which is characterized in that the concave mirror
(2) it is arranged on described image harvester (3) by connector.
9. a kind of cambered surface external surface of objects defect inspection method, which is characterized in that utilize any detections of claim 1-8
System, including：
The cambered surface of cambered surface object is irradiated using light source, the cambered surface is located within the scope of the irradiation area of the light source；
The cambered surface is imaged using concave mirror, wherein picture of the cambered surface in the concave mirror is to put
The big virtual image；
Using cambered surface described in image acquisition device, the formed virtual image in the concave mirror, obtains the inspection of the cambered surface
Altimetric image.
10. cambered surface external surface of objects defect inspection method according to claim 9, which is characterized in that utilize Image Acquisition
Device acquires cambered surface formed virtual image in the concave mirror, including：
Cambered surface formed virtual image in the concave mirror is shot using area array cameras, or is scanned using line-scan digital camera
The cambered surface formed virtual image in the concave mirror.
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