CN206038278U - Concave mirror imaging measurement telephoto lens modulation transfer function's device - Google Patents
Concave mirror imaging measurement telephoto lens modulation transfer function's device Download PDFInfo
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- CN206038278U CN206038278U CN201620971043.9U CN201620971043U CN206038278U CN 206038278 U CN206038278 U CN 206038278U CN 201620971043 U CN201620971043 U CN 201620971043U CN 206038278 U CN206038278 U CN 206038278U
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Abstract
The utility model relates to an optoelectronic integration field, in particular to concave mirror imaging measurement telephoto lens modulation transfer function's device, including measured lens head, light source, even worn -out fur and graticule, be carved with the differentiation rate unit pattern that the multiunit comprises the black and white fine rule on the graticule, the device still includes position adjustment device, concave surface speculum, image sensors and MTF data analyzer, last quantity and the image sensor assorted digital image processing unit of being equipped with of MTF data analyzer, each image sensor respectively with MTF data analyzer on each digital image processing unit one -to -one be connected. The device adopts concave surface speculum of image sensors sharing as the optical imaging camera lens, the measurement that can be used to neglect the modulation transfer function of rink corner telephoto lens multiple spot position, not only the measuring speed is fast, solved moreover since a plurality of optical lens's structure interfere the rink corner telephoto lens leads to neglecting and can't the measuring problem.
Description
Technical field
This utility model is related to field of photoelectric integration, and more particularly to a kind of concave mirror imaging measurement telephoto lens modulation is passed
The device of delivery function.
Background technology
The modulation transfer function (MTF) measurement of telephoto lens, current method are in difference using same collimation camera
Angle position, with amplifying method measurement positioned at the pattern in measured lens head portrait face, obtains the image biography of tested camera lens by data analysiss
The modulation transfer function (MTF) of each position of sensor face.Using the ImageMaster that the typical products of the method are German Trioptics
Universal.During using the product measurement optical lens, the angle of the relatively tested camera lens of mobile collimation camera is needed extremely
Start measurement behind precalculated position.When position to be measured is more, the time that is mobile and adjusting is longer, causes time of measuring to be up to
Several tens minutes, it is impossible to adapt to the requirement of batch production.
Separately there is Chinese patent CN104122077A to be with multiple digital cameras while the target surface of the tested camera lens of survey calculation
The modulation transfer function (MTF) of diverse location.And as each digital camera has independent optical lens and sensor, two digital
The minimum angle formed between video camera is restricted by optical lens mechanical dimension.Sharp scape is up to Electro-optical Technology, INC.'s profit at present
The product researched and developed with the patent, the minimum angle of visual field can only measure 28 °, it is impossible to meet the measurement such as telephoto lens of focal length 500mm
The requirement of as little as 1 ° required of the minimum angle of visual field.
Utility model content
The purpose of this utility model is to overcome disadvantage mentioned above, there is provided a kind of concave mirror imaging measurement telephoto lens modulation is passed
The device of delivery function, the device share a concave mirror as optical imaging lens using multiple images sensor, can use
In the measurement of the modulation transfer function (MTF) of small field of view angular length zoom lens multi-point, not only measuring speed is fast, and solves due to many
The constructive interference of individual optical lens causes the problem that small field of view angular length zoom lens cannot be measured.
What technical solutions of the utility model were realized in：
A kind of device of the method for concave mirror imaging measurement telephoto lens modulation transfer function (MTF), the device include tested camera lens
And it is arranged at measured lens head portrait side side and the light source, even laid successively of drawing near along the incident light axis direction of tested camera lens
Tabula rasa and graticle, be carved with the graticle multigroup meridian from not collinear pair to and the sagitta of arc constitute to the black and white fine rule of arrangement
Detectability unit pattern, the device also includes for adjusting the position regulator of the relatively tested lens location of graticle, setting
Be placed in tested camera lens object space side for cooperatively forming the concave mirror, multiple according to tested for amplifying light path with tested camera lens
The measurement requirement of camera lens be distributed in the imageing sensor on the focal plane of concave mirror and respectively with each imageing sensor phase
The MTF data analyzers of connection, the focal length of the focal length of the concave mirror more than tested camera lens, the concave mirror it is anti-
Penetrate facing to tested camera lens and the optical axis of concave mirror and tested camera lens angle of inclination of the optical axis in setting, the MTF numbers
Be provided with the digital image processing unit that quantity and imageing sensor match according to analyser, each imageing sensor respectively with
Each digital image processing unit on MTF data analyzers connects one to one.
In order to reduce volume, this utility model has done and has further improved：The device also include be arranged at concave mirror and
The plane mirror for carrying out bending to light path between imageing sensor.
As a kind of preferred scheme, the optical axis of the concave mirror Jing after plane mirror bending with tested camera lens
Optical axis is parallel.
Used as a kind of preferred scheme, the focal length of the concave mirror is 4～10 times of tested lens focus.
In order to be able to the effectively impact of the aberration to measuring such as curvature of field of reduction concave mirror, each described image sensor phase
Position Independent adjustable to concave mirror.
For prior art, this utility model has advantages below：
(1) device of the concave mirror imaging measurement telephoto lens modulation transfer function (MTF) that this utility model is provided, using multiple
Imageing sensor shares a concave mirror as optical imaging lens, can be used for the tune of small field of view angular length zoom lens multi-point
The measurement of modulation trnasfer function, not only measuring speed is fast, and solves and cause to neglect due to the constructive interference of multiple optical lens
The problem that rink corner telephoto lens cannot be measured；
(2) device of the concave mirror imaging measurement telephoto lens modulation transfer function (MTF) that this utility model is provided, and existing
The product such as ImageMaster Universal of measurement telephoto lens modulation transfer function (MTF) are compared, due to being passed using multiple images
The scheme of sensor and digital image processing unit, can measure the modulation transmission letter of the multi-point of the target surface of tested telephoto lens simultaneously
Number, it is not necessary to the action of position movement, so that the one-shot measurement time is reduced to several seconds from dozens of minutes, can be applicable to batch production
Batch production；
(3) device of the concave mirror imaging measurement telephoto lens modulation transfer function (MTF) that this utility model is provided, with patent
Technology described by CN104122077A is compared, and this utility model is made as multiway images sensor shares a concave mirror
For optical imaging lens, without the need for multiple optical lens, it is not only simple in structure, low cost of manufacture, and no multiple optical lens
Constructive interference, can be used to measure the modulation transfer function (MTF) for neglecting rink corner, telephoto lens；
(4) device of the concave mirror imaging measurement telephoto lens modulation transfer function (MTF) that this utility model is provided, due to using
Plane mirror carries out bending to light path, reduces the volume of whole measurement apparatus, not only takes up room little, and be manufactured into
This is low；
(5) device of the concave mirror imaging measurement telephoto lens modulation transfer function (MTF) that this utility model is provided, due to each
The position Independent adjustable of imageing sensor opposed concave reflecting mirror, can make imageing sensor close to concave mirror
Focal plane, effectively reduces impact of the aberrations such as the curvature of field of concave mirror to measuring, makes measurement result more accurate.
Description of the drawings
The utility model is described in further detail in conjunction with the embodiments with reference to the accompanying drawings：
Fig. 1 is the index path of the device of this utility model concave mirror imaging measurement telephoto lens modulation transfer function (MTF)；
Fig. 2 is the structural representation of the device of this utility model concave mirror imaging measurement telephoto lens modulation transfer function (MTF)；
Fig. 3 is the schematic diagram of several distribution modes of imageing sensor；
Fig. 4 is the schematic diagram of this utility model one of which detectability unit pattern.
Symbol description in figure：1st, light source, 2, even tabula rasa, 3, graticle, 4, tested camera lens, 5, concave mirror, 6, image
Sensor, 7, MTF data analyzers, 71, digital image processing unit, 8, plane mirror.
Specific embodiment
This utility model content is described in detail with reference to Figure of description and specific embodiment：
As Figure 1-4, a kind of concave mirror imaging measurement telephoto lens modulation transfer function (MTF) for providing for this utility model
Device, the device includes tested camera lens 4 and is arranged at 4 image space side of tested camera lens and the incident light axis along tested camera lens 4
Direction draws near light source 1, even tabula rasa 2 and the graticle 3 laid successively, is carved with multigroup by not collinear right on the graticle 3
Meridian to detectability unit pattern from the sagitta of arc to the black and white fine rule composition of arrangement, the device also includes for adjusting graticle
The position regulator of 3 relatively tested 4 positions of camera lens, be arranged at tested camera lens object space side for coordinating with tested camera lens 4
Form the focal plane that the concave mirror 5 of amplification light path, multiple measurement requirement according to tested camera lens 4 are distributed in concave mirror 5
On imageing sensor 6 and the MTF data analyzers 7 being connected with each imageing sensor 6 respectively, the concave mirror
Focal length of 5 focal length more than tested camera lens 4, the reflecting surface of the concave mirror 5 is towards tested camera lens 4 and concave mirror 5
Optical axis and tested camera lens 4 angle of inclination of the optical axis in setting, the MTF data analyzers 7 are provided with quantity and are passed with image
The digital image processing unit 71 that sensor 6 matches, each imageing sensor 6 respectively with MTF data analyzers 7 on each number
Word graphics processing unit 71 connects one to one.The position regulator can be manual or automatic, can be machinery
Or it is electronic etc.." angle of inclination of setting " mentioned here refers to that light can enter concave mirror 5 and reflection light
The institute that will not be blocked by the structure of tested camera lens 4 again is angled.As shown in figure 3, for 6 several distribution modes of imageing sensor
Schematic diagram.As shown in figure 4, for the schematic diagram of this utility model one of which detectability unit pattern.
In order to reduce volume, this utility model has done and has further improved：The device also includes being arranged at 5 He of concave mirror
The plane mirror 8 for carrying out bending to light path between imageing sensor 6.
As a kind of preferred scheme, the optical axis of the concave mirror 5 Jing after 8 bending of plane mirror with tested camera lens
4 optical axis is parallel.Certainly the optical axis of the optical axis and tested camera lens 4 of concave mirror 5 can also be not parallel, or other
Angle, simply the volume of whole device can not interfere with measurement result than larger.
The focal length of the concave mirror 5 must be more than several times of 4 focal length of tested camera lens, to ensure the picture of concave mirror 5
Difference affects little to measurement；The focal length of concave mirror 5 must be less than tens times of 4 focal length of tested camera lens so that imageing sensor 6
Needed for the enough MTF measurements of pattern for obtaining.Used as a kind of preferred scheme, the focal length of the concave mirror 5 is tested camera lens 4
4～10 times of focal length.
In order to be able to the effectively impact of the aberration to measuring such as curvature of field of reduction concave mirror, each described image sensor 6
The position Independent adjustable of opposed concave reflecting mirror 5.Concave reflection can be realized by increase adjusting apparatus manually or automatically
The Independent adjustable of 5 position of mirror.When the focal plane of concave mirror 5 is curved surface, each imageing sensor 6 is can adjust, passes image
Focal plane of the sensor 6 close to concave mirror 5.
When in use, the measurement requirement for being first according to tested camera lens 4 is distributed in the focal plane of concave mirror 5 to this utility model
On, by each imageing sensor 6 respectively with MTF data analyzers 7 on each 71 company of one-to-one corresponding of digital image processing unit
Connect, then adjust the relative position of graticle 3 and tested camera lens 4 by position regulator, until graticle 3 is located at measured lens
4 focal plane, to ensure to form clearly detectability list on imageing sensor 6 by the directional light of the generation of tested camera lens 4
The image of first pattern, during then each digital image processing unit 71 is chosen respectively and is located on coupled imageing sensor 6
The image of one detectability unit pattern of heart position, calculated according to the image it is not collinear to the corresponding mtf value of density, finally
MTF data analyzers 7 are calculated according to each 6 place view position of imageing sensor and each digital image processing unit 71
Mtf value, generate meridian of the tested camera lens 4 on different visual angles position to the sagitta of arc to modulation transfer function (MTF) curve.
Above-mentioned specific embodiment is simply explained in detail to the technical solution of the utility model, and this utility model is not
Above-described embodiment is limited only to only, every any improvement or replacement according to this utility model principle all should be new in this practicality
Within the protection domain of type.
Claims (5)
1. a kind of device of concave mirror imaging measurement telephoto lens modulation transfer function (MTF), it is characterised in that：The device includes tested
Camera lens (4) and it is arranged at tested camera lens (4) image space side and draws near successively along the incident light axis direction of tested camera lens (4)
The light source (1) of laying, even tabula rasa (2) and graticle (3), be carved with graticle (3) multigroup meridian from not collinear pair to
The detectability unit pattern constituted to the black and white fine rule of arrangement with the sagitta of arc, the device also include relative for adjusting graticle (3)
The position regulator of tested camera lens (4) position, be arranged at tested camera lens object space side for tested camera lens (4) coordinate shape
Concave mirror (5) is distributed in into the concave mirror (5) of light path, multiple measurement requirement according to tested camera lens (4) is amplified
Imageing sensor (6) on focal plane and the MTF data analyzers (7) being connected with each imageing sensor (6) respectively, it is described
Focal length of the focal length of concave mirror (5) more than tested camera lens (4), the reflecting surface of concave mirror (5) is towards measured lens
The optical axis of head (4) and concave mirror (5) and angle of inclination of the optical axis of tested camera lens (4) in setting, the MTF data analysiss
Instrument (7) is provided with the digital image processing unit (71) that quantity is matched with imageing sensor (6), each imageing sensor (6)
Connect one to one with each digital image processing unit (71) on MTF data analyzers (7) respectively.
2. the device of concave mirror imaging measurement telephoto lens modulation transfer function (MTF) according to claim 1, it is characterised in that：Should
Device also includes that the plane for carrying out bending to light path being arranged between concave mirror (5) and imageing sensor (6) is anti-
Penetrate mirror (8).
3. the device of concave mirror imaging measurement telephoto lens modulation transfer function (MTF) according to claim 2, it is characterised in that：Institute
The optical axis for stating concave mirror (5) is parallel with the optical axis of tested camera lens (4) Jing after plane mirror (8) bending.
4. the device of concave mirror imaging measurement telephoto lens modulation transfer function (MTF) according to claim 1, it is characterised in that：Institute
The focal length for stating concave mirror (5) is 4～10 times of tested camera lens (4) focal length.
5. the device of concave mirror imaging measurement telephoto lens modulation transfer function (MTF) according to claim 1, it is characterised in that：Respectively
The position Independent adjustable of individual described image sensor (6) opposed concave reflecting mirror (5).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620971043.9U CN206038278U (en) | 2016-08-29 | 2016-08-29 | Concave mirror imaging measurement telephoto lens modulation transfer function's device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620971043.9U CN206038278U (en) | 2016-08-29 | 2016-08-29 | Concave mirror imaging measurement telephoto lens modulation transfer function's device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106370397A (en) * | 2016-08-29 | 2017-02-01 | 福州锐景达光电科技有限公司 | Method and device for measuring modulation transfer function of telephoto lens through concave mirror imaging |
| CN107192536A (en) * | 2017-04-19 | 2017-09-22 | 华中光电技术研究所（中国船舶重工集团公司第七七研究所） | One kind is without burnt conjugated optical channels MTF test devices and method of testing |
| CN111896230A (en) * | 2020-08-10 | 2020-11-06 | 西安工业大学 | A dynamic MTF transfer function detection system for photoelectric imaging system |
-
2016
- 2016-08-29 CN CN201620971043.9U patent/CN206038278U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106370397A (en) * | 2016-08-29 | 2017-02-01 | 福州锐景达光电科技有限公司 | Method and device for measuring modulation transfer function of telephoto lens through concave mirror imaging |
| CN106370397B (en) * | 2016-08-29 | 2019-01-25 | 福州锐景达光电科技有限公司 | The method and device of concave mirror imaging measurement telephoto lens modulation transfer function |
| CN107192536A (en) * | 2017-04-19 | 2017-09-22 | 华中光电技术研究所（中国船舶重工集团公司第七七研究所） | One kind is without burnt conjugated optical channels MTF test devices and method of testing |
| CN107192536B (en) * | 2017-04-19 | 2019-06-07 | 华中光电技术研究所（中国船舶重工集团公司第七一七研究所） | It is a kind of without burnt conjugated optical channels MTF test device and test method |
| CN111896230A (en) * | 2020-08-10 | 2020-11-06 | 西安工业大学 | A dynamic MTF transfer function detection system for photoelectric imaging system |
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