CN100526832C - Off-axis reflection optical lens focus detection method - Google Patents
Off-axis reflection optical lens focus detection method Download PDFInfo
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- CN100526832C CN100526832C CNB2006101632485A CN200610163248A CN100526832C CN 100526832 C CN100526832 C CN 100526832C CN B2006101632485 A CNB2006101632485 A CN B2006101632485A CN 200610163248 A CN200610163248 A CN 200610163248A CN 100526832 C CN100526832 C CN 100526832C
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Abstract
The invention relates to a focus inspection method of abaxial reflective optical lens, which belongs to an inspection method in the technical field of optical inspection. The technical problem needed to be solved aims at providing the focus inspection method of abaxial reflective optical lens. The invention has the technical proposal that: firstly, an abaxial reflective optical lens measuring system is built; secondly, the measuring device is debugged; thirdly, the measuring is acted, a theodolite is rotated to respectively aim at the divided images of A and B with an angle difference of 2 omega; and fourthly, data processing is acted: the focus of the measured lens is obtained through the formulae of f=(y/tg omega)*cos alpha. The invention solves the measurement on focus of abaxial reflective optical lens. The invention is also suitable to be used for inspection on other abaxial optical systems.
Description
Technical field:
The invention belongs in the optical check technical field, relate to a kind of method of inspection that is used for off-axis reflection optical lens focus.
Background technology:
General coaxial reflective optics has two important disadvantages: the one, inevitable central obscuration is arranged; The 2nd, the good visual field of picture element is less.In order to solve central obscuration, way commonly used is to get its part from coaxial reflective optics, avoids central obscuration, and we are referred to as the off-axis reflection optical system.Off-axis reflection optical system light path principle schematic is seen Fig. 1, light reflexes to secondary mirror 3 along the optical axis 1 through primary mirror 2, reflexes to three mirrors 4 by secondary mirror 3 again, arrives image planes 5 by 4 reflections of three mirrors at last, system optical axis 6 has an angle α with the optical axis, is called off-axis angle.Such system does not have central obscuration, but does not have image planes along optical axis direction, and image space is at the off-axis position of optical system.Because off-axis optical system has advantages such as no central obscuration light weight visual field is big, is applied to the Aero-Space imaging optical system in recent years gradually.After optical system was debug and finished, optical system parameter was must check, and focal length be determine the optical system object-image relation important parameter.The focal length of coaxial optical system all is to test near optical axis, and multiple detection methods such as former magnification method and precision angle method all are the methods of the detection of relevant coaxial optical system, because the singularity of off-axis optical system can't be tested near optical axis.Do not find at present ready-made detection method.
Summary of the invention:
In order to overcome the defective that prior art exists, the objective of the invention is in order to solve the test problem of off-axis reflection optical lens focus.Design a kind of measuring method of off-axis reflection optical lens focus for this reason.
The technical problem to be solved in the present invention is: the method for inspection that a kind of off-axis reflection optical lens focus is provided.The technical scheme of technical solution problem: at first, set up the off-axis reflection optical lens test macro as shown in Figure 2, comprise graticule 7, camera lens to be checked 8, transit 9, adjust frock 10 and optical table 11; Groove on the graticule 7 is wanted prior precision measurement, measuring accuracy is selected according to the testing accuracy of focal length, and transit is selected general 0.5 " or 2 " transit at present for use, is required to determine by the focal length measuring accuracy, it is adjustable stable to adjust frock 10, and test is carried out in the controlled optical detection laboratory of humiture.
Secondly, proving installation is debugged,, graticule 7 dividing planes critically are transferred on the image planes of camera lens to be checked earlier with the autocollimatic method.Utilize and adjust frock 10 the camera lens optical axis to be checked leveling, camera lens to be measured 8 mounted thereto is overlapped with the optical axis extended line of transit 9, the optical axis extended line passes the center of the graticule 7 of the position of focal plane that is placed on camera lens 8 to be measured, and 7 focusing clearly become on the telescope dividing plane of transit 9 the graduation picture to graticule.
The 3rd, test, rotate transit 9, make telescopical graduation vertical line aim at the picture of graduation A, read the angular readings first time of scale; Rotate transit 9 again, make telescopical graduation vertical line aim at the picture of graduation B, read the angular readings second time of scale.The difference of twice reading is institute's angle measurement 2 ω values.
The 4th, data processing is with known graduation spacing 2y value and the angle 2 ω value substitution formula that record
Can obtain the optical axis oblique distance of camera lens to be checked
Optical axis oblique distance according to camera lens to be checked
With lens focus f ' geometric relationship to be checked, this moment is according to known camera lens off-axis angle α value, according to formula
Can try to achieve tested focal distance f '=(y/tg ω) cos α from the axle optical lens.
Above-mentioned formula is not the principle formula of intellection, but the formula of finding the solution optical system important technology parameter all has introduction on a lot of textbooks.
Principle of work explanation: the principle of work of this method is by measuring two grooves on the reflection optical lens focal plane to be checked along the optical axis, the subtended angle of its principal point is tried to achieve along optical axis oblique distance, calculates focal length according to the relation of optical axis oblique distance, off-axis angle and focal length.The focal length test philosophy is placed graticule 7 as shown in Figure 3 at camera lens focal plane to be checked place, if be spaced apart the graticule 7 of 2y, be 2 ω to the subtended angle of reflection optical lens principal point to be checked, can obtain the optical axis oblique distance of reflection optical lens 8 to be checked
Off-axis optical system optical axis oblique distance
With the relation of reflection optical lens focus f ' as shown in Figure 4, according to known reflection optical lens off-axis angle α value, according to formula
Can try to achieve optical lens to be checked focal distance f '.
Good effect of the present invention: solved the problems of measurement of off-axis reflection optical lens focus, also be applicable to that the focal length of all off-axis optical systems detects simultaneously.
Description of drawings:
Fig. 1 off-axis reflection optical system light path principle schematic
Fig. 2 off-axis reflection optical lens test macro synoptic diagram
Fig. 3 focal length test philosophy synoptic diagram
Fig. 4 off-axis optical system optical axis oblique distance and lens focus concern synoptic diagram
Embodiment:
The present invention goes to implement by the technical scheme of technical solution problem.Reflection optical lens 8 to be checked should be placed on optical detection laboratory constant temperature 24 hours before the test, make the camera lens temperature balance.During test, the graticule 7 according to the design focal length and the accuracy of detection of camera lens to be checked are selected suitable live width and spacing helps the raising of transit 9 pointing accuracies like this, and the graticule material generally adopts optical glass; Transit 9 is selected general 0.5 " or 2 " transit at present for use, is required to determine by the focal length measuring accuracy; Adjusting frock 10 should be adjustable stable; Optical table 11 should have every the battle array basis, avoids the influence of vibrating; When the picture to graduation A and B aims at,, adopt change face repeatedly to aim at the method for averaging in order to improve pointing accuracy; Test should be carried out in the controlled optical detection laboratory of humiture.
Claims (1)
1. the method for inspection of off-axis reflection optical lens focus is characterized in that: at first, set up the off-axis reflection optical lens test macro, comprise graticule (7), camera lens to be checked (8), transit (9), adjust frock (10) and optical table (11); Groove on the graticule (7) is wanted prior precision measurement, measuring accuracy is selected according to the testing accuracy of focal length, transit is selected general 0.5 " or 2 " transit at present for use, require to determine by the focal length measuring accuracy, it is adjustable stable to adjust frock (10), and test is carried out in the controlled optical detection laboratory of humiture;
Secondly, proving installation is debugged,, graticule (7) dividing plane critically is transferred on the image planes of camera lens to be checked earlier with the autocollimatic method; Utilize and adjust frock (10) the camera lens optical axis to be checked leveling, camera lens to be measured (8) mounted thereto is overlapped with the optical axis extended line of transit (9), the optical axis extended line passes the center of the graticule (7) of the position of focal plane that is placed on camera lens to be measured (8), and focusing clearly becomes on the telescope dividing plane of transit (9) the graduation picture to graticule (7);
The 3rd, test, rotate transit (9), make telescopical graduation vertical line aim at the picture of graduation A, read the angular readings first time of scale; Rotate transit (9) again, make telescopical graduation vertical line aim at the picture of graduation B, read the angular readings second time of scale, the difference of twice reading is institute's angle measurement 2 ω values;
The 4th, with known graduation spacing 2y value and the angle 2 ω value substitution formula that record
Can obtain the optical axis oblique distance of camera lens to be checked
Optical axis oblique distance according to camera lens to be checked
With lens focus f ' geometric relationship to be checked, this moment is according to known camera lens off-axis angle α value, according to formula
Can try to achieve tested focal distance f '=(y/tg ω) cos α from the axle optical lens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101632485A CN100526832C (en) | 2006-12-14 | 2006-12-14 | Off-axis reflection optical lens focus detection method |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2006101632485A CN100526832C (en) | 2006-12-14 | 2006-12-14 | Off-axis reflection optical lens focus detection method |
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| CN101169350A CN101169350A (en) | 2008-04-30 |
| CN100526832C true CN100526832C (en) | 2009-08-12 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101852677A (en) * | 2010-05-24 | 2010-10-06 | 中国科学院长春光学精密机械与物理研究所 | Method for improving focal distance detection precision of long focal distance collimator |
| CN102636181A (en) * | 2012-03-16 | 2012-08-15 | 长春奥普光电技术股份有限公司 | Method for detecting focal length of high-precision spatial aerial camera |
| CN103149013B (en) * | 2013-01-30 | 2016-01-13 | 中国科学院长春光学精密机械与物理研究所 | Based on the collimator tube reticle high precision Method of Adjustment of plane interference principle |
| CN103149014B (en) * | 2013-02-07 | 2015-05-06 | 中国科学院光电技术研究所 | Detection device and detection method for visual axis shake and focal length value of optical system |
| CN103869595B (en) * | 2014-02-24 | 2017-03-15 | 北京空间机电研究所 | A kind of method that off-axis three anti-camera focal plane is debug |
| CN104655409B (en) * | 2015-02-13 | 2017-07-14 | 中国科学院长春光学精密机械与物理研究所 | Space optical remote sensor focus adjusting mechanism simulates in-orbit gravity release detection method |
| CN109520525A (en) * | 2018-11-29 | 2019-03-26 | 中国科学院长春光学精密机械与物理研究所 | The theodolite light axis consistency method of inspection, device, equipment and readable storage medium storing program for executing |
| CN117347015B (en) * | 2023-12-06 | 2024-02-20 | 中国航天三江集团有限公司 | High-energy laser beam quality outfield high-precision measurement method and system |
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| US20040085884A1 (en) * | 2002-10-31 | 2004-05-06 | Konica Minolta Holdings, Inc. | Optical system for optical pickup apparatus |
| US20050230599A1 (en) * | 2004-04-14 | 2005-10-20 | Kanjo Orino | Illumination optical system, exposure apparatus, and device manufacturing method using the same |
| CN1687815A (en) * | 2005-03-21 | 2005-10-26 | 中国工程物理研究院激光聚变研究中心 | Method for mounting and adjusting focusing lens of off-axis paraboloid |
| CN1847973A (en) * | 2005-04-14 | 2006-10-18 | 联诚光电股份有限公司 | Abaxial optical machine with projection LCD system on silicon |
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Patent Citations (4)
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| US20040085884A1 (en) * | 2002-10-31 | 2004-05-06 | Konica Minolta Holdings, Inc. | Optical system for optical pickup apparatus |
| US20050230599A1 (en) * | 2004-04-14 | 2005-10-20 | Kanjo Orino | Illumination optical system, exposure apparatus, and device manufacturing method using the same |
| CN1687815A (en) * | 2005-03-21 | 2005-10-26 | 中国工程物理研究院激光聚变研究中心 | Method for mounting and adjusting focusing lens of off-axis paraboloid |
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