CN105675266B - Infinite conjugate optical path measures the device and method of the modulation transfer function of optical lens - Google Patents
Infinite conjugate optical path measures the device and method of the modulation transfer function of optical lens Download PDFInfo
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- CN105675266B CN105675266B CN201610078327.XA CN201610078327A CN105675266B CN 105675266 B CN105675266 B CN 105675266B CN 201610078327 A CN201610078327 A CN 201610078327A CN 105675266 B CN105675266 B CN 105675266B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/02—Testing optical properties
- G01M11/0207—Details of measuring devices
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Abstract
The device and method of the modulation transfer function of optical lens is measured the present invention relates to infinite conjugate optical path.Method includes the following steps：Slit target is installed；Camera lens to be measured is placed in camera lens pallet, and this camera lens pallet is placed in two-dimensional movement platform；LED light source is lighted, illumination is provided for test system；Best camera lens focal plane to be measured is found, determines the accurate placement location of slit；The specific location of image acquisition units is adjusted, obtains best Slit Image shooting orientation；Slit is shot by camera lens imaging to be measured, and transmits it to computer；Slit Image is handled to obtain the MTF curve of the camera lens to be measured；The position of slit target and camera lens pallet is accurately controlled by electric machine controller, realizes the continuous on-line testing of camera lens MTF numerical value to be measured on a computer platform.The method of the present invention and device can be used to measure the big camera lens of field angle, solve current finite conjugate optical system, recognition status measures the problems such as optical lens error is big, stability is poor.
Description
Technical field
The present invention relates to the measuring methods and device of a kind of modulation transfer function, and slit target is based on more particularly, to one kind
Infinite conjugate optical path measure optical lens modulation transfer function device and method.
Background technology
Modulation transfer function (MTF) is accurate, the objective and quantitative image quality evaluation index of one of optical lens, public
It is considered that current optical camera lens is most effective, most comprehensive evaluation of imaging quality mode.If object is regarded as by various frequencies
Frequency spectrum composition, MTF then reflects transmission capacity of the optical system to object different frequency ingredient.In general, high frequency section
Reflect the details transmission capacity of object, the level of intermediate-frequency section reflection object transmits situation, and low frequency part then reflects object
Profile transmits situation.The main method that optical lens factory measures optical lens MTF at present is inverse projection visual method.This method
Principle be：The graticle for being carved with resolution pattern is positioned over outside the image space focal plane of camera lens to be measured and close to image space focal plane
Position on, floor light light source uniform irradiation is on graticle.The position of graticle and camera lens to be measured is adjusted respectively, you can will
The enlarged drawing of graduation plate pattern is imaged on the screen (wall) to number meter Yuan apart from the hundreds of millimeters of camera lens object space focal plane to be measured
On.Operating personnel are obtained by estimating not collinear pair in the graduation plate pattern being imaged on screen (wall) of number of lines
MTF curve.The advantages of this method：1st, equipment cost is low；2nd, it is easy to operate easy to learn.The disadvantages of this method：1st, estimation mode relies on
The judgement experience of operator, application condition are big；2nd, specific MTF numerical value can not be recorded, the MTF of full frequency band can not be provided；3rd, it surveys
It is big to try labor intensity, operator's fatiguability；4th, whole efficiency is than relatively low.
Patent CN104122077A measures the MTF of specific frequency using contrast method.It is a variety of not collinear right being carved with
The resolution chart of density is placed in the position of focal plane of camera lens to be measured, and the groove on resolution chart is taken the photograph by lens imaging to be measured to number
In camera, then by the not collinear contrast to density on analysis and identification rate plate, the mtf value of certain specific frequencies is obtained, it should
Scheme can only once test a camera lens.
Patent CN101813558A describes a kind of method for the MTF that optical lens is measured using recognition status.Knife edge target
Certain angle is tilted relative to image acquisition units, realizes oversampling technique, improves sample rate.By analyzing numerical value video camera
The edge of a knife tilted image taken, obtains the mtf value of full rate.
Visual method precision is low, speed is slow；Contrast method can not provide the mtf value of full rate, can only provide certain specific
The mtf value of frequency, test result be not comprehensive；Knife-edge method obtains line diffusion letter due to carry out differential calculation to edge-spread function
Number, therefore anti-noise ability is poor, test result is inaccurate, also unstable.Moreover, the above common method of these types, can not meet
In the demand of the on-line continuous detection needed for the production of large-scale optical lens.
Invention content
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide one kind is based on slit target
Infinite conjugate optical path measure optical lens modulation transfer function device and method, apparatus of the present invention and method can be used for surveying
The modulation transfer function for the optical lens that focal range is 1-12mm is measured, optical lens modulation in background technology is solved and transmits letter
The problems such as error is big, speed is slow, stability is poor in number test process.The invention not only has strong antijamming capability, can provide
MTF in full frequency band, measurement is accurate, easy to operate, measuring speed is fast, and measuring device is small, occupied space is few, is not required to
Darkroom can meet the online detection requirements of optical lens mass production, application easy to spread.
The purpose of the present invention can be achieved through the following technical solutions：
Technical solution of the present invention one：The device that infinite conjugate optical path measures the modulation transfer function of optical lens is provided.
A kind of infinite conjugate optical path measures the device of the modulation transfer function of optical lens, including：
Main frame：It is used to support two-dimension moving platform and slit target；
One-dimensional focusing motor：The lower section of slit target is connected to, slit target is driven to move in the vertical direction；
Camera lens pallet：It is arranged on two-dimension moving platform, is driven and moved in the horizontal direction by two-dimension moving platform, thereon
For placing camera lens to be measured；
Electric machine controller：It is connect with one-dimensional focusing motor and two-dimension moving platform, controls one-dimensional focusing motor and two maintenance and operations
The movement of moving platform；
Umbrella frame：It is disposed on the top of camera lens pallet；
Image collection unit：It is radially arranged on umbrella frame, is made of connected detector with telescope；
LED light source：The light source sent out is transmitted to by light-conductive optic fibre in slit target, and the flashlight with slit information is put down
Row is incident to camera lens to be measured, and the directional light with slit information being emitted from camera lens to be measured is imaged on detector by telescope coke
On test surface, the image with slit information is passed to computer by detector；
Computer：The image obtained to detector is handled, and obtains the modulation transfer function of camera lens to be measured.
In the present invention, the slit target includes a supporting rack, and the centre of the supporting rack is the through-hole of light transmission, in through-hole
Top be provided with diffuser plate, the slit ontology with slit information is placed on diffuser plate, sets and protects in the upper end of supporting rack
Lid sets to be located in the positioning column on main frame in the downside of supporting rack.
For protection cap for slit ontology to be protected not touched by other foreign matters, slit ontology uses the glass with slit,
For Slit Image, diffuser plate is used to carry out dodging to incident light, and Uniform Illumination is provided for slit.Supporting rack is used to support
Slit ontology.
There are three the positioning column is set, the main frame is equipped with the positioning to match with the positioning column of slit target
Slot, the end face of the positioning column is spherical surface, and the locating slot is V-groove, is had between the positioning column and locating slot
Certain magnetic attraction positions slit target by the collective effect of positioning column and locating slot.The height of the positioning column can
It adjusts, and then the levelness of diffuser plate or slit ontology can be adjusted, so as to adjust the optical axis of slit target and camera lens to be measured
Vertically.
In the present invention, multiple measured holes are provided on the camera lens pallet, are used to place individually in each measured hole
Camera lens to be measured, the lower surface of the measured hole and camera lens pallet connect；The camera lens pallet lower surface, which is provided with, to be used for
The positioning column being located on two-dimension moving platform also is provided with what is matched with the positioning column of camera lens pallet on two-dimension moving platform
Locating slot, the positioning column end face of camera lens pallet are spherical surface, and the locating slot on two-dimension moving platform is V-groove.Camera lens pallet is determined
The height of position column is adjustable, and then can adjust the levelness of camera lens pallet.On the positioning column and two-dimension moving platform of camera lens pallet
Locating slot between have certain magnetic attraction.
The two-dimension moving platform is used to that camera lens pallet to be driven to move along two vertical direction in the horizontal plane, mobile
There are two purposes, first, the camera lens to be measured on cutaway pallet, another purpose was being tested for camera lens to be measured
Centering operation in journey, refers to that camera lens optical axis to be measured is consistent with telescope, slit target, detector center in.
In the present invention, image collection unit setting is multiple, is set along the radial direction of umbrella frame, and the image is received
Collection unit can be slided in the radial direction of umbrella frame.
The telescope is the preposition optics concentrating portions of image collection unit.Slit is carried from what camera lens to be measured was emitted
On detector test surface, relevant information is obtained convenient for detector by telescope focal imaging for the directional light of information.It measures not
With the camera lens to be measured of focal length, the focal length of the telescope may be different.
The detector is the photoelectric conversion part in image collection unit, using CCD or CMOS sensitive films.Comprising narrow
The optical signal of target information is stitched, by camera lens to be measured and telescope, is incident on detector, it is possible to collect comprising slit image
The Slit Image of Luminance Distribution or intensity profile.
The umbrella frame, be by the circular machinery part on centre position on camera lens pallet centered on camera lens principal point to be measured,
For installing the assembly of detector and telescope sum.Image acquisition units can in the radial direction be slided in umbrella frame,
To test the MTF of the different visual fields of camera lens to be measured.Different slit target, different camera lenses to be measured, different measurement visual fields, all
Position that can be by adjusting image acquisition units on umbrella frame, makes slit blur-free imaging on the detector.
In order to realize the function of on-line continuous detection, using electric machine controller one-dimensional focusing motor is accurately controlled in the present invention
And two-dimension moving platform；And the Slit Image for obtaining detector is transmitted to computer by data collecting card, in computer
Realize the denoising of image and the calculating of MTF；The entirely infinite conjugate based on slit is realized eventually by specific software systems
The global proceduresization control of path optics camera lens modulation transfer function test instrument.
Technical solution of the present invention two：The method that infinite conjugate optical path measures the modulation transfer function of optical lens is provided.
The method that the modulation transfer function of infinite conjugate optical path measurement optical lens is carried out based on above device, including following
Step：
A, slit target is installed：Slit target is positioned over to the middle part of main frame；
B, two-dimension moving platform and camera lens pallet are placed：Two-dimension moving platform is arranged on main frame, placement is needed
The camera lens pallet for surveying camera lens is placed on two-dimension moving platform；
C, LED light source by light-conductive optic fibre with slit target is connect, lights LED light source, illumination is provided for device；
D, optimal focal plane is found：One-dimensional focusing motor is adjusted, until the slit image of central vision is clear, which is exactly to treat
Survey the position near the optimal focal plane of camera lens；And on the basis of this position, one-dimensional focusing motor moving range is set, so as to
By one-dimensional focusing motor, to every, camera lens to be measured is focused；
E, image acquisition units position is adjusted：The position of the image acquisition units of the peripheral field on umbrella frame is adjusted, is made
The slit image of peripheral field is located at detector center；Rotary detector rectifies slit image vertical in level in image
State；
F, Slit Image is shot：Start the Slit Image in detector acquisition respective field of vision；And it is passed using data collecting card
Transport to computer；
G, MTF is calculated：Slit Image of the computer according to acquired in each detector calculates corresponding after denoising
Line spread function, then Fourier transformation is carried out to the line spread function, so as to obtain the mtf value of the slit image in the sub-picture,
The mtf value of camera lens as to be measured, and generate meridian of the camera lens to be measured on different visual angles position to the sagitta of arc to MTF curve；
H, the MTF of continuous on-line testing camera lens to be measured：One-dimensional focusing motor and two dimension are accurately controlled by electric machine controller
Motion platform；MTF test programs are realized using computer complete machine software systems, complete the MTF curve of multiple camera lenses to be measured
Continuous on-line testing.
In the present invention, using object space scenery of the slit target as test system, stable image space image information is obtained.
In the present invention, one-dimensional focusing motor drives slit target to be moved near the image planes of camera lens to be measured, herein mistake
Cheng Zhong, the detector for acquiring Slit Image shoot a pictures at every fixed time, and then computer analyzes these in difference
The slit image that image planes station acquisition arrives, and then the depth of focus value (Throughfocus values) of the camera lens to be measured is obtained, and this can be found
The optimum image plane position of camera lens to be measured.
The open and close of LED light source and illumination are adjusted to be controlled by program by computer and be completed.
The present invention operation principle be：After LED light source is lighted, by light-conductive optic fibre, it imported into the slit with diffuser plate
In target.Light is after diffuser plate spreads dodging, uniform illumination slit.Flashlight with slit information is parallel to be incident to
Camera lens to be measured is incident in the smaller telephoto lens of field angle (horizontal direction field angle is less than 15 °) later.Directional light passes through
The convergence of telescope, imaging is on the detector.In this way, just there is the slit image by camera lens to be measured and telescope on detector.Meter
Calculation machine is filtered except dry processing the slit image, obtains line spread function, and Fourier transformation is carried out to the line spread function, from
And the mtf value of the slit image in the sub-picture is obtained, the MTF numerical value of camera lens as to be measured, and camera lens to be measured can be generated in difference
Meridian on view position to the sagitta of arc to MTF curve.The accurate adjustment for realizing slit target position is controlled by computer
And the orderly switching of camera lens pallet, it realizes MTF test programs using computer software, completes multiple camera lenses to be measured
The continuous on-line testing of MTF curve.
Compared with prior art, the present invention has the following advantages and beneficial effects：
1st, detection device and method provided by the invention can be used for measuring wide-angle lens, fish eye lens, television system, light guide
The MTF of the big optical system of the field angles such as fiber solves current finite conjugate optical system and measures above-mentioned optical system MTF mistakes
The problem of poor big, stability is poor；
2nd, the infinite conjugate optical path MTF detection methods provided by the invention based on slit not only measure accurately, but also operate
Simplicity, measuring speed are fast, can meet the online of optical lens mass production with the multiple camera lenses to be measured of follow-on test every time
Testing requirements；
3rd, detection device provided by the invention not only can simply and rapidly measure the clarity of camera lens to be measured, but also
It is small, occupied space is few, be not required to darkroom, dependable performance, manufacture application at low cost, easy to spread；
4th, detection device provided by the invention is equipped with umbrella frame installing component, can quickly locate telescope and detector
The angle of conjoined assembly can carry out lift adjustment by a focusing motor, the optical axis of detector can be made rapidly to be aligned
The front principal point of camera lens to be measured further improves measuring speed, user-friendly.
Description of the drawings
Fig. 1 is the structure diagram of apparatus of the present invention；
Fig. 2 is the structure diagram of slit target；
Fig. 3 assembling schematic diagrams between slit target upper positioning column and locating slot；
Fig. 4 is the overlooking the structure diagram of camera lens pallet；
Fig. 5 is the side structure schematic view of camera lens pallet；
Fig. 6 is camera lens pallet and camera lens assembling structure schematic diagram to be measured；
Fig. 7 is narrow slit structure and slit image on slit ontology used in embodiment 1.
Figure label：1 is LED light source, and 2 be slit target, and 21 be protection cap, and 22 be slit ontology, and 23 be diffuser plate, 24
It is positioning column for supporting rack, 25,3 be one-dimensional focusing motor, and 4 be camera lens pallet, and 41 be measured hole, and 42 be positioning column, and 5 be two dimension
Motion platform, 6 be data collecting card, and 7 be telescope, and 8 be detector, and 9 be umbrella frame, and 10 be camera lens to be measured, and 11 be motor control
Device processed, 12 be computer, and 13 be main frame, and 131 be locating slot, and 14 be light-conductive optic fibre.
Specific embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
Embodiment 1
A kind of infinite conjugate optical path measures the device of the modulation transfer function of optical lens, as shown in Figure 1, including main frame
13rd, one-dimensional focusing motor 3, camera lens pallet 4, electric machine controller 11, umbrella frame 9, LED light source 1 and computer 12, main frame 13 are used
In support two-dimension moving platform 5 and slit target 2；One-dimensional focusing motor 3 is connected to the lower section of slit target 2, drives slit target
Mark 2 moves in the vertical direction；Camera lens pallet 4 is arranged on two-dimension moving platform 5, is driven by two-dimension moving platform 5 and in water
Square to movement, thereon for placing camera lens 10 to be measured；Electric machine controller 11 and one-dimensional focusing motor 3 and two-dimension moving platform 5
Connection controls the movement of one-dimensional focusing motor 3 and two-dimension moving platform 5；Umbrella frame 9 is disposed on the top of camera lens pallet 4；
Image collection unit radial is arranged on umbrella frame 9, is made of connected detector 8 with telescope 7；The light that LED light source 1 is sent out
Source is transmitted to by light-conductive optic fibre 14 in slit target 2, has the flashlight of slit information is parallel to be incident to camera lens 10 to be measured, from
The directional light with slit information that camera lens 10 to be measured is emitted is imaged on by 7 coke of telescope on 8 test surface of detector, detector
Image with slit information is passed to computer 12 by 8；The image that computer 12 obtains detector 8 is handled, and is obtained
The modulation transfer function of camera lens 10 to be measured.
As shown in Figure 2 and Figure 3, slit target 2 includes a supporting rack 24, and the centre of the supporting rack 24 is the through-hole of light transmission,
Diffuser plate 23 is provided with above through-hole, the slit ontology 22 with slit information is placed on diffuser plate 23, in supporting rack 24
Upper end sets protection cap 21, sets to be located in the positioning column 25 on main frame 13 in the downside of supporting rack 24.Protection cap 21
For slit ontology 22 to be protected not touched by other foreign matters, slit ontology 22 is using the glass with slit, for slit figure
Picture, diffuser plate 23 are used to carry out dodging to incident light, and Uniform Illumination is provided for slit.Supporting rack 24 is used to support slit sheet
Body 22.There are three positioning column 25 is set, main frame 13 is equipped with the locating slot 131 to match with the positioning column 25 of slit target 2, fixed
The end face of position column 25 is spherical surface, and locating slot 131 is V-groove, has certain magnetic attraction between positioning column 25 and locating slot 131,
Slit target 2 is positioned by the collective effect of positioning column 25 and locating slot 131.The height of positioning column 25 is adjustable, and then can be with
The levelness of diffuser plate 23 or slit ontology 22 is adjusted, it is vertical with the optical axis of camera lens 10 to be measured so as to adjust slit target 2.
As shown in Figure 4,5, 6, multiple measured holes 41 are provided on camera lens pallet 4, are used to place list in each measured hole 41
Only camera lens to be measured 10, measured hole 41 and the lower surface of camera lens pallet 4 connect；4 lower surface of camera lens pallet is provided with for fixed
Positioning column 42 of the position on two-dimension moving platform 5, also is provided with and 42 phase of the positioning column of camera lens pallet 4 on two-dimension moving platform 5
Matched locating slot, 42 end face of positioning column of camera lens pallet 4 are spherical surface, and the locating slot on two-dimension moving platform 5 is V-groove.Mirror
The height of the positioning column 42 of head rest disk 4 is adjustable, and then can adjust the levelness of camera lens pallet 4.The positioning column 42 of camera lens pallet 4
There is certain magnetic attraction between the locating slot on two-dimension moving platform 5.
Two-dimension moving platform 5 is for driving camera lens pallet 4 to be moved in the horizontal plane along two vertical direction, mobile purpose
There are two, first, the camera lens to be measured 10 on cutaway pallet 4, another purpose was being tested for camera lens 10 to be measured
Centering operation in journey, refers to that 10 optical axis of camera lens to be measured is consistent with telescope 7, slit target 2,8 center of detector in.
The setting of image collection unit is multiple, is set along the radial direction of umbrella frame 9, image collection unit can be in umbrella frame 9
Radial direction is slided.
Telescope 7 is the preposition optics concentrating portions of image collection unit.Believe from what camera lens 10 to be measured was emitted with slit
On 8 test surface of detector, relevant information is obtained convenient for detector 8 by 7 focal imaging of telescope for the directional light of breath.It measures not
With the camera lens to be measured 10 of focal length, the focal length of the telescope 7 may be different.
Detector 8 is the photoelectric conversion part in image collection unit, using CCD or CMOS sensitive films.Include slit target
The optical signal of 2 information is marked, by camera lens 10 to be measured and telescope 7, is incident on detector 8, it is possible to collect comprising slit
Image brightness is distributed or the Slit Image of intensity profile.
Umbrella frame 9 is by the circular machinery part on centre position on camera lens pallet 4 centered on 10 principal point of camera lens to be measured, uses
In the assembly of installation 7 sum of detector 8 and telescope.Image acquisition units can in the radial direction be slided in umbrella frame 9,
To test the MTF of the different visual fields of camera lens 10 to be measured.Different slit target 2, different camera lenses to be measured 10, different measurements regard
, position that can be by adjusting image acquisition units on umbrella frame 9 makes slit blur-free imaging on the detector 8.
In order to realize the function of on-line continuous detection, accurately control one-dimensional focusing electric using electric machine controller 11 in the present invention
Machine 3 and two-dimension moving platform 5；And the Slit Image that detector 8 obtains is transmitted to computer 12 by data collecting card 6,
The denoising of image and the calculating of MTF are realized in computer 12；It is realized eventually by specific software systems and is entirely based on slit
Infinite conjugate optical path optical lens modulation transfer function test instrument global proceduresization control.
The method that the modulation transfer function of infinite conjugate optical path measurement optical lens is carried out based on above device, including following
Step：
A, installation slit target 2：Slit target 2 is positioned over to the middle part of main frame 13；
B, two-dimension moving platform 5 and camera lens pallet 4 are placed：Two-dimension moving platform 5 is arranged on main frame 13, placement
The camera lens pallet 4 for having camera lens 10 to be measured is placed on two-dimension moving platform 5；
C, LED light source 1 by light-conductive optic fibre 14 with slit target 2 is connect, lights LED light source 1, photograph is provided for device
It is bright；
D, optimal focal plane is found：One-dimensional focusing motor 3 is adjusted, until the slit image of central vision is clear, which is exactly
Position near the optimal focal plane of camera lens 10 to be measured；And on the basis of this position, set one-dimensional focusing motor 3 and move model
It encloses, will pass through one-dimensional focusing motor 3, to every, camera lens 10 to be measured is focused；
E, image acquisition units position is adjusted：The position of the image acquisition units of the peripheral field on umbrella frame 9 is adjusted, is made
The slit image of peripheral field is located at 8 center of detector；Rotary detector 8 makes what slit image rectified to be located in image in horizontal vertical
Straight state；
F, Slit Image is shot：Start the Slit Image in the acquisition respective field of vision of detector 8；And utilize data collecting card 6
It is transmitted to computer 12；
G, MTF is calculated：Slit Image of the computer 12 according to acquired in each detector 8 calculates after denoising
Corresponding line spread function, then Fourier transformation is carried out to the line spread function, so as to obtain the MTF of the slit image in the sub-picture
Value, the mtf value of camera lens 10 as to be measured, and generate meridian of the camera lens 10 to be measured on different visual angles position to the sagitta of arc to
MTF curve；
H, the MTF of continuous on-line testing camera lens 10 to be measured：One-dimensional focusing 3 He of motor is accurately controlled by electric machine controller 11
Two-dimension moving platform 5；MTF test programs are realized using 12 complete machine software systems of computer, complete multiple camera lenses 10 to be measured
The continuous on-line testing of MTF curve.
Wherein, using object space scenery of the slit target 2 as test system, stable image space image information is obtained.
Wherein, one-dimensional focusing motor 3 drives slit target 2 to be moved near the image planes of camera lens 10 to be measured, herein mistake
Cheng Zhong, the detector 8 for acquiring Slit Image shoot a pictures at every fixed time, and then computer 12 analyzes these not
With the slit image that image planes station acquisition arrives, and then the Throughfocus values of the camera lens 10 to be measured are obtained, and it is to be measured to find this
The optimum image plane position of camera lens 10.
The open and close of LED light source 1 and illumination are adjusted to be controlled by program by computer 12 and be completed.
As shown in fig. 7, the left side is narrow slit structure, the right is slit imaging after camera lens 10 to be measured.
The above description of the embodiments is intended to facilitate ordinary skill in the art to understand and use the invention.
Person skilled in the art obviously can easily make these embodiments various modifications, and described herein general
Principle is applied in other embodiment without having to go through creative labor.Therefore, the present invention is not limited to above-described embodiment, abilities
Field technique personnel announcement according to the present invention, improvement and modification made without departing from the scope of the present invention all should be the present invention's
Within protection domain.
Claims (8)
1. a kind of infinite conjugate optical path measures the device of the modulation transfer function of optical lens, which is characterized in that including：
Main frame (13)：It is used to support two-dimension moving platform (5) and slit target (2)；
One-dimensional focusing motor (3)：The lower section of slit target (2) is connected to, slit target (2) is driven to move in the vertical direction；
Camera lens pallet (4)：It is arranged on two-dimension moving platform (5), is driven by two-dimension moving platform (5) and moved in the horizontal direction
It is dynamic, it is used to place camera lens to be measured (10) thereon；
Electric machine controller (11)：It is connect with one-dimensional focusing motor (3) and two-dimension moving platform (5), controls one-dimensional focusing motor (3)
And the movement of two-dimension moving platform (5)；
Umbrella frame (9)：It is disposed on the top of camera lens pallet (4)；
Image collection unit：It is radially arranged on umbrella frame (9), is made of connected detector (8) with telescope (7)；
LED light source (1)：The light source sent out is transmitted to by light-conductive optic fibre (14) in slit target (2), has the letter of slit information
Number light is parallel is incident to camera lens to be measured (10), from the directional light with slit information that camera lens to be measured (10) is emitted by telescope
(7) coke is imaged on detector (8) test surface, and the image with slit information is passed to computer (12) by detector (8)；
Computer (12)：The image obtained to detector (8) is handled, and obtains the modulation transfer function of camera lens to be measured (10)；
The slit target (2) includes a supporting rack (24), and the centre of the supporting rack (24) is the through-hole of light transmission, in through-hole
Top is provided with diffuser plate (23), the slit ontology (22) with slit information is placed on diffuser plate (23), in supporting rack (24)
Upper end setting protection cap (21), set in the downside of supporting rack (24) for the positioning column that is located on main frame (13)
(25)。
2. a kind of infinite conjugate optical path according to claim 1 measures the device of the modulation transfer function of optical lens,
It is characterized in that, multiple measured holes (41) is provided on the camera lens pallet (4), are used to place individually in each measured hole (41)
Camera lens to be measured (10), the measured hole (41) and the lower surface of camera lens pallet (4) connect.
3. a kind of infinite conjugate optical path according to claim 1 measures the device of the modulation transfer function of optical lens,
It is characterized in that, the two-dimension moving platform (5) is for driving camera lens pallet (4) to be moved in the horizontal plane along two vertical direction
It is dynamic.
4. a kind of infinite conjugate optical path according to claim 1 measures the device of the modulation transfer function of optical lens,
It is characterized in that, image collection unit setting is multiple, is set along the radial direction of umbrella frame (9), the image collection list
Member can be slided in the radial direction of umbrella frame (9).
5. a kind of infinite conjugate optical path according to claim 1 measures the device of the modulation transfer function of optical lens,
It is characterized in that, the detector (8) is the photoelectric conversion part in image collection unit, using CCD or CMOS sensitive films.
6. letter is transmitted in the modulation that infinite conjugate optical path measurement optical lens is carried out based on any one of claim 1-5 described devices
Several method, which is characterized in that this method includes the following steps：
A, installation slit target (2)：Slit target (2) is positioned over to the middle part of main frame (13)；
B, two-dimension moving platform (5) and camera lens pallet (4) are placed：Two-dimension moving platform (5) is arranged on main frame (13),
The camera lens pallet (4) for being placed with camera lens to be measured (10) is placed on two-dimension moving platform (5)；
C, LED light source (1) by light-conductive optic fibre (14) with slit target (2) is connect, lights LED light source (1), provided for device
Illumination；
D, optimal focal plane is found：One-dimensional focusing motor (3) is adjusted, until the slit image of central vision is clear, which is exactly to treat
Survey the position near the optimal focal plane of camera lens (10)；And on the basis of this position, set one-dimensional focusing motor (3) and move model
It encloses, will pass through one-dimensional focusing motor (3), to every, camera lens (10) to be measured is focused；
E, image acquisition units position is adjusted：The position of the image acquisition units of the peripheral field on umbrella frame (9) is adjusted, makes side
The slit image of edge visual field is located at detector (8) center；Rotary detector (8) makes what slit image rectified to be located in image in level
Vertical state；
F, Slit Image is shot：Start the Slit Image in detector (8) acquisition respective field of vision；And it is transmitted to computer (12)；
G, MTF is calculated：Slit Image of the computer (12) according to acquired in each detector (8) calculates after denoising
Corresponding line spread function, then Fourier transformation is carried out to the line spread function, so as to obtain the MTF of the slit image in the sub-picture
Value, the mtf value of camera lens (10) as to be measured, and generate meridian of the camera lens to be measured (10) on different visual angles position to the sagitta of arc to
MTF curve；
H, the MTF of continuous on-line testing camera lens to be measured (10)：One-dimensional focusing motor (3) is accurately controlled by electric machine controller (11)
With two-dimension moving platform (5)；MTF test programs are realized using computer (12), and the MTF for completing multiple camera lenses (10) to be measured is bent
The continuous on-line testing of line.
7. the method that a kind of infinite conjugate optical path according to claim 6 measures the modulation transfer function of optical lens,
It is characterized in that, one-dimensional focusing motor (3) drives slit target (2) nearby to be moved in the image planes of camera lens to be measured (10), herein
In the process, the detector (8) for acquiring Slit Image shoots a pictures at every fixed time, and then computer (12) analyzes this
The slit image arrived a bit in different image planes station acquisitions, and then the depth of focus value of the camera lens (10) to be measured is obtained, and it is to be measured to find this
The optimum image plane position of camera lens (10).
8. the method that a kind of infinite conjugate optical path according to claim 6 measures the modulation transfer function of optical lens,
It is characterized in that, the open and close of LED light source (1) and illumination are adjusted to be controlled by program by computer (12) and be completed.
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