CN105675266A - Device and method for measuring modulation transfer function of optical lens based on infinite conjugate optical path - Google Patents

Device and method for measuring modulation transfer function of optical lens based on infinite conjugate optical path Download PDF

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Publication number
CN105675266A
CN105675266A CN201610078327.XA CN201610078327A CN105675266A CN 105675266 A CN105675266 A CN 105675266A CN 201610078327 A CN201610078327 A CN 201610078327A CN 105675266 A CN105675266 A CN 105675266A
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Prior art keywords
slit
camera lens
measured
image
mtf
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CN201610078327.XA
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CN105675266B (en
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白学坤
庄怀港
谭羽
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Shanghai Xinzhi precision optics Co.,Ltd.
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Shanghai Evenoptics Technology Co Ltd
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01MTESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M11/00Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
    • G01M11/02Testing optical properties
    • G01M11/0207Details of measuring devices

Abstract

The invention relates to a device and method for measuring a modulation transfer function of an optical lens based on an infinite conjugate optical path. The method comprises the following steps: installing a slit target; enabling a to-be-measured lens to be placed in a lens pallet, and placing the lens pallet on a two-dimensional platform; turning on an LED light source, so as to provide illumination for a testing system; searching an optimal focal plane of the to-be-measured lens, and determining the accurate placement position of a slit; adjusting the specific position of an image collection unit, and obtaining the optimal photographing azimuth of a slit image; photographing the tilt image through the to-be-measured lens, and transmitting the slit image to a computer; processing the slit image and obtaining an MTF curve of the to-be-measured lens; precisely controlling the position of the tilt target and the position of the lens pallet through a motor controller, and achieving the continuous online testing of an MTF value of the to-be-measured lens on the computer platform. The method and device can be used for measuring the lens with a big field angle, and solve problems that a conventional infinite conjugate optical system and a conventional edge method are large in optical lens error and poor in stability.

Description

Infinite conjugate optical path measures the device and method of the modulation transfer function (MTF) of optical lens
Technical field
The present invention relates to the measuring method of a kind of modulation transfer function (MTF) and device, especially relate to the device and method that a kind of infinite conjugate optical path based on slit target measures the modulation transfer function (MTF) of optical lens.
Background technology
Modulation transfer function (MTF) (MTF) is accurate, an objective and quantitative image quality evaluation index of optical lens, is acknowledged as current optical camera lens evaluation of imaging quality mode most effective, the most comprehensive. If object being regarded as and being made up of the frequency spectrum of various frequencies, MTF then reflects the optical system transmission capacity to object different frequency composition. In general, the details transmission capacity of HFS reflection object, the level transmission situation of intermediate-frequency section reflection object, low frequency part then reflects the profile transmission situation of object. It is inverse projection visual method that the main method of optical lens MTF is measured by current optical lens factory. The party's ratio juris is: be positioned over outside the image space focal plane of camera lens to be measured by the graticle being carved with detectability pattern and on the position of image space focal plane, floor light light source uniform irradiation is on graticle. Adjust the position of graticle and camera lens to be measured respectively, the enlarged drawing picture of graticle pattern can be imaged on the camera lens thing side to be measured hundreds of millimeter in focal plane to the screen (wall) of number meter Yuan. Operator are imaged on the graticle pattern on screen (wall) number of lines of not collinear pair by range estimation, and then obtain MTF curve. The advantage of the method: 1, equipment cost is low; 2, simple to operate easy to learn. The shortcoming of the method: 1, range estimation mode, relies on the judgement experience of operator, and application condition is big; 2, concrete MTF numerical value cannot be recorded, it is impossible to provide the MTF of full frequency band; 3, test labor intensity is big, operator's fatiguability; 4, whole efficiency is relatively low.
That patent CN104122077A adopts is the MTF of contrast method measurement characteristic frequency. The position of focal plane being carved with the multiple not collinear resolution chart to density and being placed in camera lens to be measured, groove on resolution chart is in lens imaging to be measured to digital camera, then pass through the not collinear contrast to density on analysis and identification rate plate, drawing the mtf value of some characteristic frequency, the program once can only test a camera lens.
Patent CN101813558A describes a kind of method of MTF adopting recognition status to measure optical lens. Knife edge target tilts certain angle relative to image acquisition units, it is achieved oversampling technique, improves sample rate. By analyzing the edge of a knife tilted image that numerical value video camera photographs, obtain the mtf value of full rate.
Visual method precision is low, speed is slow; Contrast method cannot provide the mtf value of full rate, can only provide the mtf value of some characteristic frequency, and test result is not comprehensive; Knife-edge method obtains line spread function owing to edge-spread function is carried out differential calculation, therefore anti-noise ability is poor, and test result is inaccurate, also unstable. And, these several conventional methods above, all cannot be satisfied with large-scale optical lens and produce the demand of required on-line continuous detection.
Summary of the invention
Defect that the purpose of the present invention is contemplated to overcome above-mentioned prior art to exist and the device and method of modulation transfer function (MTF) that a kind of infinite conjugate optical path based on slit target measures optical lens is provided, apparatus of the present invention and method can be used for the modulation transfer function that focal length measurement ranges for the optical lens of 1-12mm, solve in background technology the problems such as in optical lens modulation transfer function test process, error is big, speed slow, poor stability. This invention not only has strong capacity of resisting disturbance, the MTF being provided that in full frequency band, it is accurate, easy and simple to handle to measure, measuring speed is fast, and measurement apparatus volume is little, occupy little space, do not need darkroom, the online detection requirements that optical lens is produced in enormous quantities can be met, it is easy to popularization and application.
The purpose of the present invention can be achieved through the following technical solutions:
Technical solution of the present invention one: the device of the modulation transfer function (MTF) of infinite conjugate optical path measurement optical lens is provided.
A kind of infinite conjugate optical path measures the device of the modulation transfer function (MTF) of optical lens, including:
Main frame: be used for supporting two-dimension moving platform and slit target;
One-dimensional focusing motor: be connected to the lower section of slit target, drives slit target in the vertical direction to move;
Camera lens pallet: be arranged on two-dimension moving platform, is driven by two-dimension moving platform and moves in the horizontal direction, it is used for place camera lens to be measured;
Electric machine controller: be connected with one-dimensional focusing motor and two-dimension moving platform, controls the motion of one-dimensional focusing motor and two-dimension moving platform;
Umbrella frame: be disposed on the top of camera lens pallet;
Image collection unit: be radially arranged on umbrella frame, detector and telescope by being connected form;
LED light source: the light source sent is delivered in slit target by light-conductive optic fibre, have that the flashlight of slit information is parallel is incident to camera lens to be measured, being imaged on detector test surface from the directional light with slit information of camera lens outgoing to be measured through telescope Jiao, the image with slit information is passed to computer by detector;
Computer: the image that detector is obtained processes, and obtains the modulation transfer function (MTF) of camera lens to be measured.
In the present invention; described slit target includes a bracing frame; the centre of this bracing frame is the through hole of printing opacity; it is provided above diffuser plate at through hole; diffuser plate is placed the slit body with slit information; protection lid is set in the upper end of bracing frame, is arranged to the locating dowel being positioned on main frame in the downside of bracing frame.
Protection lid is used for protecting slit body not touched by other foreign bodies, and slit body adopts the glass with slit, and for Slit Image, diffuser plate, for incident illumination is carried out dodging, provides Uniform Illumination for slit.Bracing frame is used for supporting slit body.
Described locating dowel is provided with three, described main frame is provided with the locating slot that the locating dowel with slit target matches, the end face of described locating dowel is sphere, described locating slot is V-groove, there is between described locating dowel and locating slot certain magnetic attraction, position slit target by the combined effect of locating dowel Yu locating slot. The height adjustable of described locating dowel, and then diffuser plate or the levelness of slit body can be regulated, such that it is able to it is vertical with the optical axis of camera lens to be measured to adjust slit target.
In the present invention, described camera lens pallet being provided with multiple measured hole, for placing independent camera lens to be measured in each measured hole, the lower surface of described measured hole and camera lens pallet connects; Described camera lens pallet lower surface is provided with the locating dowel for being positioned on two-dimension moving platform, two-dimension moving platform also is provided with the locating slot matched with the locating dowel of camera lens pallet, the locating dowel end face of camera lens pallet is sphere, and the locating slot on two-dimension moving platform is V-groove. The height adjustable of the locating dowel of camera lens pallet, and then can the levelness of adjustable lens pallet. There is between locating slot in the locating dowel of camera lens pallet and two-dimension moving platform certain magnetic attraction.
Described two-dimension moving platform is used for driving camera lens pallet vertically moveable along two in the horizontal plane, the purpose of movement has two, one is the camera lens to be measured on cutaway pallet, another purpose is for the camera lens to be measured centering operation in test process, and centering refers to that camera lens optical axis to be measured and telescope, slit target, detector center are consistent.
In the present invention, described image collection unit arranges multiple, all being radially arranged along umbrella frame, and described image collection unit can slide in the radial direction of umbrella frame.
Described telescope is the preposition optics concentrating portions of image collection unit. From the directional light with slit information of camera lens outgoing to be measured through telescope focal imaging on detector test surface, it is simple to detector obtain relevant information. Measuring the camera lens to be measured of different focal, this telescopical focal length is likely to difference.
Described detector is the photoelectric conversion part in image collection unit, adopts CCD or CMOS sensitive film. Comprise the optical signal of slit target information, by camera lens to be measured and telescope, incide on detector, it is possible to collect the Slit Image comprising slit image Luminance Distribution or intensity profile.
Described umbrella frame, is circular machinery part centered by camera lens principal point to be measured on camera lens pallet on centre position, for installing detector and the assembly of telescope sum. Image acquisition units can be slided in the radial direction at umbrella frame, to test the MTF of the different visual fields of camera lens to be measured. Different slit targets, different camera lenses to be measured, different measurement visual fields, such as through adjusting image acquisition units position on umbrella frame, make slit blur-free imaging on the detector.
In order to realize the function of on-line continuous detection, the present invention use electric machine controller accurately control one-dimensional focusing motor and two-dimension moving platform; And the Slit Image of detector acquisition is transmitted to computer by data collecting card, in computer, realize the denoising of image and the calculating of MTF; The global proceduresization realizing the whole infinite conjugate optical path optical lens modulation transfer function test instrument based on slit eventually through specific software system controls.
Technical solution of the present invention two: the method that the modulation transfer function (MTF) of infinite conjugate optical path measurement optical lens is provided.
Carry out, based on said apparatus, the method that infinite conjugate optical path measures the modulation transfer function (MTF) of optical lens, comprise the following steps:
A, installation slit target: slit target is positioned over the middle part of main frame;
B, placement two-dimension moving platform and camera lens pallet: two-dimension moving platform is arranged on main frame, the camera lens pallet being placed with camera lens to be measured is placed on two-dimension moving platform;
C, LED light source is connected with slit target by light-conductive optic fibre, lights LED light source, illuminate for device offer;
D, searching optimal focal plane: regulate one-dimensional focusing motor, until the slit image of central vision is clear, this position is exactly the position near the optimal focal plane of camera lens to be measured; And on the basis of this position, set one-dimensional focusing motor moving range, in order to by one-dimensional focusing motor, every camera lens to be measured is focused;
E, image acquisition units position adjustments: the position of the image acquisition units of the peripheral field on adjustment umbrella frame, make the slit image of peripheral field be positioned at detector center; Rotary detector, making the image that is arranged in that slit image is rectified is the vertical state of level;
F, shooting Slit Image: start detector and obtain the Slit Image in respective field of vision; And utilize data collecting card to transmit to computer;
G, MTF calculate: computer is according to the acquired Slit Image of each detector, corresponding line spread function is calculated after denoising, again this line spread function is carried out Fourier transformation, thus the mtf value of the slit image obtained in this sub-picture, be the mtf value of camera lens to be measured, and generate the camera lens to be measured meridian on different visual angles position to the sagitta of arc to MTF curve;
H, continuous on-line testing camera lens to be measured MTF: accurately control one-dimensional focusing motor and two-dimension moving platform by electric machine controller; Utilize computer complete machine software system to realize MTF test program, complete the continuous on-line testing of the MTF curve of multiple camera lens to be measured.
In the present invention, adopt slit target as thing side's scenery of test system, obtain stable image space image information.
In the present invention, one-dimensional focusing driven by motor slit target moves near the image planes of camera lens to be measured, in the process, the detector gathering Slit Image shoots a pictures every regular time, then these slit images arrived in different image planes station acquisition analyzed by computer, and then obtain the depth of focus value (Throughfocus value) of this camera lens to be measured, and the optimum image plane position of this camera lens to be measured can be found.
The open and close of LED light source and illumination are regulated and are completed by programme-control by computer.
The operation principle of the present invention is: after LED light source is lighted, and through light-conductive optic fibre, imports in the slit target with diffuser plate. Light spreads after dodging through diffuser plate, uniform illumination slit. Have that the flashlight of slit information is parallel is incident to camera lens to be measured, incide afterwards (the horizontal direction angle of visual field is less than 15 °) in the telephoto lens that the angle of visual field is smaller. Directional light is through telescopical convergence, and imaging is on the detector. So, detector just has through camera lens to be measured and telescopical slit image. This slit image is filtered removing dry process by computer, obtain line spread function, this line spread function is carried out Fourier transformation, thus the mtf value of the slit image obtained in this sub-picture, be the MTF numerical value of camera lens to be measured, and can generate the camera lens to be measured meridian on different visual angles position to the sagitta of arc to MTF curve.Accurately adjusting of computer control realization slit target position and switching in order of camera lens pallet, utilize computer software to realize MTF test program, complete the continuous on-line testing of the MTF curve of multiple camera lens to be measured.
Compared with prior art, the present invention has the following advantages and beneficial effect:
1, detecting device provided by the invention and method can be used for measuring the MTF of the big optical system of the angles of visual field such as wide-angle lens, fish eye lens, television system, optical fibers, solve current finite conjugate optical system and measure that above-mentioned optical system MTF error is big, the problem of poor stability;
2, the infinite conjugate optical path MTF detection method based on slit provided by the invention is not only measured accurately, and easy and simple to handle, measuring speed is fast, every time can the multiple camera lens to be measured of follow-on test, it is possible to meet the online detection requirements that optical lens is produced in enormous quantities;
3, detecting device provided by the invention is possible not only to simply and rapidly, measure the definition of camera lens to be measured, and volume is little, occupy little space, do not need darkroom, dependable performance, low cost of manufacture, application easy to spread;
4, detecting device provided by the invention is provided with umbrella frame installing component, telescope and the angle of detector conjoined assembly can be quickly located, lift adjustment can be carried out by a focusing motor, the optical axis that can make detector is directed at the front principal point of camera lens to be measured rapidly, further increase measuring speed, user-friendly.
Accompanying drawing explanation
Fig. 1 is the structural representation of apparatus of the present invention;
Fig. 2 is the structural representation of slit target;
Fig. 3 assembles schematic diagram between locating dowel and locating slot on slit target;
Fig. 4 is the plan structure schematic diagram of camera lens pallet;
Fig. 5 is the side-looking structural representation of camera lens pallet;
Fig. 6 is camera lens pallet and camera lens to be measured assembling structural representation;
Fig. 7 is narrow slit structure and slit image on the slit body used in embodiment 1.
Number in the figure: 1 is LED light source, 2 is slit target, and 21 is protection lid, and 22 is slit body; 23 is diffuser plate, and 24 is bracing frame, and 25 is locating dowel, and 3 is one-dimensional focusing motor; 4 is camera lens pallet, and 41 is measured hole, and 42 is locating dowel, and 5 is two-dimension moving platform; 6 is data collecting card, and 7 is telescope, and 8 is detector, and 9 is umbrella frame; 10 is camera lens to be measured, and 11 is electric machine controller, and 12 is computer; 13 is main frame, and 131 is locating slot, and 14 is light-conductive optic fibre.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
Embodiment 1
A kind of infinite conjugate optical path measures the device of the modulation transfer function (MTF) of optical lens, as shown in Figure 1, including main frame 13, 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 is used for supporting 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 2 in the vertical direction to move; Camera lens pallet 4 is arranged on two-dimension moving platform 5, is driven by two-dimension moving platform 5 and moves in the horizontal direction, it is used for place camera lens 10 to be measured; Electric machine controller 11 is connected with one-dimensional focusing motor 3 and two-dimension moving platform 5, controls the motion 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 up of detector 8 and the telescope 7 being connected;The light source that LED light source 1 sends is delivered in slit target 2 by light-conductive optic fibre 14, have that the flashlight of slit information is parallel is incident to camera lens 10 to be measured, being imaged on detector 8 test surface from the directional light with slit information of camera lens 10 to be measured outgoing through telescope 7 Jiao, the image with slit information is passed to computer 12 by detector 8; The image that detector 8 is obtained by computer 12 processes, and obtains the modulation transfer function (MTF) of camera lens 10 to be measured.
As shown in Figure 2 and Figure 3; slit target 2 includes a bracing frame 24; the centre of this bracing frame 24 is the through hole of printing opacity; it is provided above diffuser plate 23 at through hole; diffuser plate 23 is placed the slit body 22 with slit information; protection lid 21 is set in the upper end of bracing frame 24, is arranged to the locating dowel 25 being positioned on main frame 13 in the downside of bracing frame 24. Protection lid 21 is used for protecting slit body 22 not touched by other foreign bodies, and slit body 22 adopts the glass with slit, and for Slit Image, diffuser plate 23, for incident illumination is carried out dodging, provides Uniform Illumination for slit. Bracing frame 24 is used for supporting slit body 22. Locating dowel 25 is provided with three, main frame 13 is provided with the locating slot 131 that the locating dowel 25 with slit target 2 matches, the end face of locating dowel 25 is sphere, locating slot 131 is V-groove, there is between locating dowel 25 and locating slot 131 certain magnetic attraction, position slit target 2 by the combined effect of locating dowel 25 with locating slot 131. The height adjustable of locating dowel 25, and then diffuser plate 23 or the levelness of slit body 22 can be regulated, such that it is able to it is vertical with the optical axis of camera lens 10 to be measured to adjust slit target 2.
As shown in Figure 4,5, 6, camera lens pallet 4 being provided with multiple measured hole 41, for placing independent camera lens to be measured 10 in each measured hole 41, the lower surface of measured hole 41 and camera lens pallet 4 connects; Camera lens pallet 4 lower surface is provided with the locating dowel 42 for being positioned on two-dimension moving platform 5, two-dimension moving platform 5 also is provided with the locating slot that the locating dowel 42 with camera lens pallet 4 matches, locating dowel 42 end face of camera lens pallet 4 is sphere, and the locating slot on two-dimension moving platform 5 is V-groove. The height adjustable of the locating dowel 42 of camera lens pallet 4, and then can the levelness of adjustable lens pallet 4. Between locating slot in the locating dowel 42 of camera lens pallet 4 and two-dimension moving platform 5, there is certain magnetic attraction.
Two-dimension moving platform 5 is used for driving camera lens pallet 4 vertically moveable along two in the horizontal plane, the purpose of movement has two, one is for the camera lens to be measured 10 on cutaway pallet 4, another purpose is for the camera lens 10 to be measured centering operation in test process, and centering refers to that camera lens 10 optical axis to be measured and telescope 7, slit target 2, detector 8 center are consistent.
Image collection unit arranges multiple, all being radially arranged along umbrella frame 9, and image collection unit can slide in the radial direction of umbrella frame 9.
Telescope 7 is the preposition optics concentrating portions of image collection unit. From the directional light with slit information of camera lens 10 to be measured outgoing through telescope 7 focal imaging on detector 8 test surface, it is simple to detector 8 obtains relevant information. Measuring the camera lens to be measured 10 of different focal, the focal length of this telescope 7 is likely to difference.
Detector 8 is the photoelectric conversion part in image collection unit, adopts CCD or CMOS sensitive film. Comprise the optical signal of slit target 2 information, by camera lens 10 to be measured and telescope 7, incide on detector 8, it is possible to collect the Slit Image comprising slit image Luminance Distribution or intensity profile.
Umbrella frame 9, is circular machinery part centered by camera lens 10 principal point to be measured on camera lens pallet 4 on centre position, for installing detector 8 and the assembly of telescope 7 sum. Image acquisition units can be slided in the radial direction at umbrella frame 9, to test the MTF of the different visual fields of camera lens 10 to be measured. Different slit targets 2, different camera lenses to be measured 10, different measurement visual fields, such as through adjusting image acquisition units position on umbrella frame 9, make slit blur-free imaging on the detector 8.
In order to realize the function of on-line continuous detection, the present invention use electric machine controller 11 accurately control one-dimensional focusing motor 3 and two-dimension moving platform 5; And the Slit Image obtained by detector 8 transmitted to computer 12 by data collecting card 6, in computer 12, realize the denoising of image and the calculating of MTF; The global proceduresization realizing the whole infinite conjugate optical path optical lens modulation transfer function test instrument based on slit eventually through specific software system controls.
Carry out, based on said apparatus, the method that infinite conjugate optical path measures the modulation transfer function (MTF) of optical lens, comprise the following steps:
A, installation slit target 2: slit target 2 is positioned over the middle part of main frame 13;
B, placement two-dimension moving platform 5 and camera lens pallet 4: two-dimension moving platform 5 is arranged on main frame 13, the camera lens pallet 4 being placed with camera lens 10 to be measured is placed on two-dimension moving platform 5;
C, LED light source 1 is connected with slit target 2 by light-conductive optic fibre 14, lights LED light source 1, provide for device and illuminate;
D, searching optimal focal plane: regulate one-dimensional focusing motor 3, until the slit image of central vision is clear, this position is exactly the 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 moving range, in order to by one-dimensional focusing motor 3, every camera lens 10 to be measured is focused;
E, image acquisition units position adjustments: the position of the image acquisition units of the peripheral field on adjustment umbrella frame 9, make the slit image of peripheral field be positioned at detector 8 center; Rotary detector 8, making the image that is arranged in that slit image is rectified is the vertical state of level;
F, shooting Slit Image: start detector 8 and obtain the Slit Image in respective field of vision; And utilize data collecting card 6 to transmit to computer 12;
G, MTF calculate: computer 12 is according to the acquired Slit Image of each detector 8, corresponding line spread function is calculated after denoising, again this line spread function is carried out Fourier transformation, thus the mtf value of the slit image obtained in this sub-picture, be the mtf value of camera lens 10 to be measured, and generate the camera lens 10 to be measured meridian on different visual angles position to the sagitta of arc to MTF curve;
H, continuous on-line testing camera lens to be measured 10 MTF: accurately control one-dimensional focusing motor 3 and two-dimension moving platform 5 by electric machine controller 11; Utilize computer 12 complete machine software system to realize MTF test program, complete the continuous on-line testing of the MTF curve of multiple camera lens to be measured 10.
Wherein, adopt slit target 2 as thing side's scenery of test system, obtain stable image space image information.
Wherein, one-dimensional focusing motor 3 drives slit target 2 to move near the image planes of camera lens 10 to be measured, in the process, the detector 8 gathering Slit Image shoots a pictures every regular time, then these slit images arrived in different image planes station acquisition analyzed by computer 12, and then obtain the Throughfocus value of this camera lens 10 to be measured, and the optimum image plane position of this camera lens 10 to be measured can be found.
The open and close of LED light source 1 and illumination are regulated and are completed by programme-control by computer 12.
As it is 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-mentioned description to embodiment is to be understood that for ease of those skilled in the art and use invention. These embodiments obviously easily can be made various amendment by person skilled in the art, and General Principle described herein is applied in other embodiments without through performing creative labour. Therefore, the invention is not restricted to above-described embodiment, those skilled in the art's announcement according to the present invention, the improvement made without departing from scope and amendment all should within protection scope of the present invention.

Claims (10)

1. the device of the modulation transfer function (MTF) of an infinite conjugate optical path measurement optical lens, it is characterised in that including:
Main frame (13): be used for supporting two-dimension moving platform (5) and slit target (2);
One-dimensional focusing motor (3): be connected to the lower section of slit target (2), drives slit target (2) in the vertical direction to move;
Camera lens pallet (4): be arranged on two-dimension moving platform (5), is driven by two-dimension moving platform (5) and moves in the horizontal direction, it is used for place camera lens to be measured (10);
Electric machine controller (11): be connected with one-dimensional focusing motor (3) and two-dimension moving platform (5), controls the motion of one-dimensional focusing motor (3) and two-dimension moving platform (5);
Umbrella frame (9): be disposed on the top of camera lens pallet (4);
Image collection unit: be radially arranged on umbrella frame (9), detector (8) and telescope (7) by being connected form;
LED light source (1): the light source sent is delivered in slit target (2) by light-conductive optic fibre (14), have that the flashlight of slit information is parallel is incident to camera lens to be measured (10), being imaged on detector (8) test surface from the directional light with slit information of camera lens to be measured (10) outgoing through telescope (7) Jiao, the image with slit information is passed to computer (12) by detector (8);
Computer (12): the image that detector (8) is obtained processes, and obtains the modulation transfer function (MTF) of camera lens to be measured (10).
2. a kind of infinite conjugate optical path according to claim 1 measures the device of the modulation transfer function (MTF) of optical lens, it is characterized in that, described slit target (2) includes a bracing frame (24), the through hole that centre is printing opacity of this bracing frame (24), it is provided above diffuser plate (23) at through hole, diffuser plate (23) is upper places the slit body (22) with slit information, protection lid (21) is set in the upper end of bracing frame (24), the locating dowel (25) being positioned on main frame (13) it is arranged in the downside of bracing frame (24).
3. a kind of infinite conjugate optical path according to claim 1 measures the device of the modulation transfer function (MTF) of optical lens, it is characterized in that, described camera lens pallet (4) is provided with multiple measured hole (41), for placing independent camera lens to be measured (10) in each measured hole (41), the lower surface of described measured hole (41) and camera lens pallet (4) connects.
4. a kind of infinite conjugate optical path according to claim 1 measures the device of the modulation transfer function (MTF) of optical lens, it is characterized in that, described two-dimension moving platform (5) is used for driving camera lens pallet (4) vertically moveable along two in the horizontal plane.
5. a kind of infinite conjugate optical path according to claim 1 measures the device of the modulation transfer function (MTF) of optical lens, it is characterized in that, described image collection unit arranges multiple, all being radially arranged along umbrella frame (9), described image collection unit can slide in the radial direction of umbrella frame (9).
6. a kind of infinite conjugate optical path according to claim 1 measures the device of the modulation transfer function (MTF) of optical lens, it is characterised in that described detector (8) is the photoelectric conversion part in image collection unit, adopts CCD or CMOS sensitive film.
7. carry out, based on device according to any one of claim 1-6, the method that infinite conjugate optical path measures the modulation transfer function (MTF) of optical lens, it is characterised in that the method comprises the following steps:
A, installation slit target (2): slit target (2) is positioned over the middle part of main frame (13);
B, placement two-dimension moving platform (5) and camera lens pallet (4): two-dimension moving platform (5) is arranged on main frame (13), the camera lens pallet (4) being placed with camera lens to be measured (10) is placed on two-dimension moving platform (5);
C, LED light source (1) is connected with slit target (2) by light-conductive optic fibre (14), lights LED light source (1), provide illumination for device;
D, searching optimal focal plane: regulate one-dimensional focusing motor (3), until the slit image of central vision is clear, this position is exactly the position near the optimal focal plane of camera lens to be measured (10); And on the basis of this position, set one-dimensional focusing motor (3) moving range, in order to by one-dimensional focusing motor (3), every camera lens to be measured (10) is focused;
E, image acquisition units position adjustments: the position of the image acquisition units of the peripheral field in adjustment umbrella frame (9), make the slit image of peripheral field be positioned at detector (8) center; Rotary detector (8), making the image that is arranged in that slit image is rectified is the vertical state of level;
F, shooting Slit Image: start detector (8) and obtain the Slit Image in respective field of vision; And transmit to computer (12);
G, MTF calculate: computer (12) is according to the acquired Slit Image of each detector (8), corresponding line spread function is calculated after denoising, again this line spread function is carried out Fourier transformation, thus the mtf value of the slit image obtained in this sub-picture, be the mtf value of camera lens to be measured (10), and generate the camera lens to be measured (10) meridian on different visual angles position to the sagitta of arc to MTF curve;
H, continuous on-line testing camera lens to be measured (10) MTF: accurately control one-dimensional focusing motor (3) and two-dimension moving platform (5) by electric machine controller (11); Utilize computer (12) to realize MTF test program, complete the continuous on-line testing of the MTF curve of multiple camera lens to be measured (10).
8. the method that a kind of infinite conjugate optical path according to claim 7 measures the modulation transfer function (MTF) of optical lens, it is characterised in that adopt slit target (2) as thing side's scenery of test system, obtain stable image space image information.
9. the method that a kind of infinite conjugate optical path according to claim 7 measures the modulation transfer function (MTF) of optical lens, it is characterized in that, one-dimensional focusing motor (3) drives slit target (2) to move near the image planes of camera lens to be measured (10), in the process, the detector (8) gathering Slit Image shoots a pictures every regular time, then these slit images arrived in different image planes station acquisition analyzed by computer (12), and then obtain the depth of focus value of this camera lens to be measured (10), and the optimum image plane position of this camera lens to be measured (10) can be found.
10. the method that a kind of infinite conjugate optical path according to claim 7 measures the modulation transfer function (MTF) of optical lens, it is characterized in that, the open and close of LED light source (1) and illumination are regulated and are completed by programme-control by computer (12).
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