CN103063415A - Long-focus lens focus distance measuring method based on moire fringe matching - Google Patents

Long-focus lens focus distance measuring method based on moire fringe matching Download PDF

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CN103063415A
CN103063415A CN201310001055XA CN201310001055A CN103063415A CN 103063415 A CN103063415 A CN 103063415A CN 201310001055X A CN201310001055X A CN 201310001055XA CN 201310001055 A CN201310001055 A CN 201310001055A CN 103063415 A CN103063415 A CN 103063415A
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focus lens
focus
ronchi grating
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CN103063415B (en
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王涌鹏
罗佳
白剑
于红雷
金晓荣
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Zhejiang University ZJU
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Abstract

The invention discloses a long-focus lens focus distance measuring method based on moire fringe matching. According to the long-focus lens focus distance measuring method based on the moire fringe matching, divergent light is adopted to serve as a light source, a moire fringe is collected firstly through a charge coupled device (CCD) camera when a long-focus lens to be measured focus is not added, focus distance between the light source to an initial divergent beam of the first Lang grating, the light source is moved forward and backward after the long-focus lens to be measured focus is added until a present moire fringe collected by the CCD camer is the same as the first moire fringe, combined focal distance between a new divergent beam and the lens to be measured is the same as the focus distance of the initial divergent beam, and then the focus distance of the long-focus lens to be measured is obtained. The long-focus lens focus distance measuring method based on the moire fringe matching has the advantages that focus distance of the long-focus lens (focus distance can be several meters to tens of meters) with a heavy caliber can be measured accurately, uniqueness is achieved by using a moire fringe angle as a criterion, measurement of an included angle between grating lines of two gratings is not needed, and error of the moire fringe angle caused by installation of an imaging system is avoided.

Description

A kind of long focus length of lens measuring method based on the Moire fringe coupling
Technical field
The invention belongs to the optic test field, relate in particular to a kind of long focus length of lens measuring method based on the Moire fringe coupling.
Background technology
Inertial confinement fusion is the effective way of human use's laser controlling nuclear fusion, makes nuclear fusion discharge corresponding energy according to the mankind's needs, thereby obtains controlled nuclear fusion energy source, makes the mankind thoroughly break away from the energy starved puzzlement.Long-focus lens is basic components very crucial in the inertial confinement fusion, is bringing into play more and more important effect, and required focal length is more and more longer, and bore is also increasing.In large scale system, such as national portfire, long-focus lens is crucial collective optics, and the focal length of these lens reaches tens meters.The use of long-focus lens needs corresponding detection technique, but at present high precision detects the measurement that particularly is accurate to several millimeters even hundreds of micron and still has a lot of difficulties, for example high-precision detection be subject to external interference particularly the impact of air turbulence and external shock be difficult to eliminate, and the aberration of lens to be measured is difficult to realize high-acruracy survey along with the measurement of the increase focusing position of focal length impact also increases in the detection system.Therefore the high precision Long focal length measurement method and apparatus that is easy to realize has very large application space and very important application.
The applicant applied for that a number of patent application is 201110252061.3 in 2011, name is called the patent of invention of " a kind of focal length pick-up unit of high precision long-focus lens ", mentioned the method that a kind of focal length detects in the instructions of this patent, the grid line angle that the method need to be measured the first Ronchi grating and the second Ronchi grating calculates long focus length of lens value to be measured, and the degree of accuracy that the grid line angle of the first Ronchi grating and the second Ronchi grating is measured has limited the raising of focometry precision.
Summary of the invention
The objective of the invention is for the deficiencies in the prior art, a kind of long focus length of lens measuring method based on the moiré topography coupling is provided.The present invention adopts the method for coupling Moire fringe, does not need to measure the grid line angle of the first Ronchi grating and the second Ronchi grating, has improved the focal length accuracy of detection of long-focus lens.
The objective of the invention is to be achieved through the following technical solutions: a kind of long focus length of lens measuring method based on the Moire fringe coupling may further comprise the steps:
Step 1: the light that laser instrument sends forms initial divergent beams behind microcobjective and pin hole, incide on the first Ronchi grating, incide again the second Ronchi grating, regulate the distance between the first Ronchi grating and the second Ronchi grating, so that the Taibo picture of the first Ronchi grating and the second Ronchi grating form Moire fringe at frosted glass, with CCD collected by camera striped, obtain initial stripe angle
Figure 201310001055X100002DEST_PATH_IMAGE001
Measure this moment pin hole to the distance of the first Ronchi grating
Figure 307208DEST_PATH_IMAGE002
,
Figure 197803DEST_PATH_IMAGE002
Be the focal length of initial divergent beams;
Step 2: between pin hole and the first Ronchi grating, put into long-focus lens to be measured;
Step 3: synchronizing moving laser instrument, microcobjective and pin hole, the light that laser instrument sends forms new divergent beams behind microcobjective and pin hole, incide on the long-focus lens to be measured, again through the first Ronchi grating and the second Ronchi grating, the Taibo picture of the first Ronchi grating and the second Ronchi grating form new Moire fringe at frosted glass, with CCD collected by camera striped, obtain stripe angle this moment
Figure 201310001055X100002DEST_PATH_IMAGE003
Step 4: contrast
Figure 932541DEST_PATH_IMAGE003
With
Figure 479060DEST_PATH_IMAGE001
If,
Figure 652553DEST_PATH_IMAGE004
, so new divergent beams are identical with the focal length of the combined focal length of lens to be measured and initial divergent beams, enter next step; If
Figure 600917DEST_PATH_IMAGE003
With
Figure 568873DEST_PATH_IMAGE001
Unequal, then repeating step 3, until
Figure 665005DEST_PATH_IMAGE004
Step 5: measure this moment pin hole to the distance of long-focus lens front surface to be measured
Figure 201310001055X100002DEST_PATH_IMAGE005
With the distance of long-focus lens front surface to be measured to the first Ronchi grating
Figure 314292DEST_PATH_IMAGE006
By the combined focal length formula:
Figure 201310001055X100002DEST_PATH_IMAGE007
Can obtain the focal length of lens to be measured
Figure 117163DEST_PATH_IMAGE008
In the formula,
Figure 201310001055X100002DEST_PATH_IMAGE009
Be the center thickness of long-focus lens to be measured,
Figure 193704DEST_PATH_IMAGE010
Be the refractive index of long-focus lens glass to be measured,
Figure 201310001055X100002DEST_PATH_IMAGE011
Be the radius-of-curvature of long-focus lens front surface to be measured,
Figure 711885DEST_PATH_IMAGE012
Radius-of-curvature for long-focus lens to be measured rear surface.
The invention has the beneficial effects as follows:
1. the present invention uses the Moire fringe matching technique, is compared to traditional long-focus measuring technology based on Moire fringe, does not need to measure two grating grid angles.Twice Moire fringe angle is identical as criterion before and after using, and occurrence is not used in the focal length that calculates long-focus lens to be measured.
2. the present invention can be for detection of several meters to tens meters focal range, laser instrument, microcobjective, pin hole can move along optical axis is accurate, when measuring the different focal lens, only need mobile laser instrument, microcobjective, pin hole to reach suitable position, focal length measurement and high repeatability precision is arranged accurately just, light path is simple, is easy to realize.
Description of drawings
Fig. 1 is the synoptic diagram of step 1 of the present invention;
Fig. 2 is the synoptic diagram of step 2 of the present invention and 3;
Among the figure: laser instrument 1, object lens 2, pin hole 3, the first Ronchi grating 4, the second Ronchi grating 5, frosted glass 6, CCD camera 7, long-focus lens to be measured 8.
Embodiment
As shown in the figure, the long focus length of lens measuring method that the present invention is based on Moire fringe coupling may further comprise the steps:
Step 1: as shown in Figure 1, the light that laser instrument 1 sends forms initial divergent beams behind microcobjective 2 and pin hole 3, incide on the first Ronchi grating 4, incide again the second Ronchi grating 5, regulate the distance between the first Ronchi grating 4 and the second Ronchi grating 5, so that the Taibo picture of the first Ronchi grating 4 and the second Ronchi grating 5 form Moire fringe at frosted glass 6, gather striped with CCD camera 7, obtain initial stripe angle
Figure 899284DEST_PATH_IMAGE001
Measure the distance of pin hole 3 to first Ronchi gratings 4 this moment
Figure 884557DEST_PATH_IMAGE002
, Be the focal length of initial divergent beams.
Step 2: as shown in Figure 2, between pin hole 3 and the first Ronchi grating 4, put into long-focus lens 8 to be measured.
Step 3: synchronizing moving laser instrument 1, microcobjective 2 and pin hole 3.The light that laser instrument 1 sends forms new divergent beams behind microcobjective 2 and pin hole 3, incide on the long-focus lens 8 to be measured, again through the first Ronchi grating 4 and the second Ronchi grating 5, the Taibo picture of the first Ronchi grating 4 and the second Ronchi grating 5 form new Moire fringe at frosted glass 6, gather striped with CCD camera 7, obtain stripe angle this moment
Step 4: contrast
Figure 193813DEST_PATH_IMAGE003
With
Figure 33593DEST_PATH_IMAGE001
If,
Figure 451936DEST_PATH_IMAGE004
, so new divergent beams are identical with the focal length of the combined focal length of lens to be measured and initial divergent beams, enter next step; If
Figure 744377DEST_PATH_IMAGE003
With
Figure 601475DEST_PATH_IMAGE001
Unequal, then repeating step 3, until
Figure 233444DEST_PATH_IMAGE004
Step 5: measure this moment pin hole 3 to the distance of long-focus lens 8 front surfaces to be measured
Figure 885006DEST_PATH_IMAGE005
With the distance of long-focus lens 8 front surfaces to be measured to the first Ronchi grating 4
Figure 868005DEST_PATH_IMAGE006
By the combined focal length formula:
Figure 263214DEST_PATH_IMAGE007
Can obtain the focal length of lens to be measured
Figure 749690DEST_PATH_IMAGE008
In the formula,
Figure 837732DEST_PATH_IMAGE009
Be the center thickness of long-focus lens to be measured,
Figure 39519DEST_PATH_IMAGE010
Be the refractive index of long-focus lens glass to be measured,
Figure 238419DEST_PATH_IMAGE011
Be the radius-of-curvature of long-focus lens front surface to be measured,
Figure 579402DEST_PATH_IMAGE012
Radius-of-curvature for long-focus lens to be measured rear surface.
Application the present invention is based on the long focus length of lens measuring method of Moire fringe coupling and measures long focus length of lens, does not need to measure the grid line angle of the first Ronchi grating and the second Ronchi grating, has improved the focal length accuracy of detection of long-focus lens.

Claims (1)

1. the long focus length of lens measuring method based on the Moire fringe coupling is characterized in that, may further comprise the steps:
Step 1: the light that laser instrument (1) sends forms initial divergent beams behind microcobjective (2) and pin hole (3), incide on the first Ronchi grating (4), incide again the second Ronchi grating (5), regulate the distance between the first Ronchi grating (4) and the second Ronchi grating (5), so that the Taibo picture of the first Ronchi grating (4) and the second Ronchi grating (5) form Moire fringe at frosted glass (6), gather striped with CCD camera (7), obtain initial stripe angle
Figure 201310001055X100001DEST_PATH_IMAGE001
Measure pin hole this moment (3) to the distance of the first Ronchi grating (4) ,
Figure 968069DEST_PATH_IMAGE002
Be the focal length of initial divergent beams;
Step 2: between pin hole (3) and the first Ronchi grating (4), put into long-focus lens to be measured (8);
Step 3: synchronizing moving laser instrument (1), microcobjective (2) and pin hole (3), the light that laser instrument (1) sends forms new divergent beams behind microcobjective (2) and pin hole (3), incide on the long-focus lens to be measured (8), again through the first Ronchi grating (4) and the second Ronchi grating (5), the Taibo picture of the first Ronchi grating (4) and the second Ronchi grating (5) form new Moire fringe at frosted glass (6), gather striped with CCD camera (7), obtain stripe angle this moment
Figure 201310001055X100001DEST_PATH_IMAGE003
Step 4: contrast
Figure 127786DEST_PATH_IMAGE003
With
Figure 540313DEST_PATH_IMAGE001
If,
Figure 505995DEST_PATH_IMAGE004
, so new divergent beams are identical with the focal length of the combined focal length of lens to be measured and initial divergent beams, enter next step; If
Figure 687578DEST_PATH_IMAGE003
With
Figure 814934DEST_PATH_IMAGE001
Unequal, then repeating step 3, until
Figure 652440DEST_PATH_IMAGE004
Step 5: measure pin hole this moment (3) to the distance of long-focus lens to be measured (8) front surface
Figure 201310001055X100001DEST_PATH_IMAGE005
With the distance of long-focus lens to be measured (8) front surface to the first Ronchi grating (4)
Figure 156233DEST_PATH_IMAGE006
Can pass through the combined focal length formula:
Figure 201310001055X100001DEST_PATH_IMAGE007
Obtain the focal length of lens to be measured
Figure 392655DEST_PATH_IMAGE008
In the formula,
Figure 201310001055X100001DEST_PATH_IMAGE009
Be the center thickness of long-focus lens to be measured,
Figure 628595DEST_PATH_IMAGE010
Be the refractive index of long-focus lens glass to be measured,
Figure 201310001055X100001DEST_PATH_IMAGE011
Be the radius-of-curvature of long-focus lens front surface to be measured,
Figure 953398DEST_PATH_IMAGE012
Radius-of-curvature for long-focus lens to be measured rear surface.
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Cited By (9)

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CN105547653A (en) * 2016-01-06 2016-05-04 中国科学院光电技术研究所 Double-telecentric lens magnification measuring method based on Moire interference
CN105737763A (en) * 2014-12-11 2016-07-06 高瑞 Spherical mirror curvature radius measurement method based on More stripes
CN107764518A (en) * 2017-09-26 2018-03-06 北京空间机电研究所 A kind of optical lens focal length measuring equipment and method
CN107941473A (en) * 2017-12-06 2018-04-20 西南技术物理研究所 A kind of Long focal length measurement device with fringe contrast automatic regulation function
CN109741231A (en) * 2018-12-27 2019-05-10 浙江大学 It is a kind of to take the photograph screen picture source tracing method based on moire fringes
CN110631509A (en) * 2019-10-10 2019-12-31 南京理工大学 Object surface curvature detection system and method based on grating Talbot image
CN112082490A (en) * 2020-10-21 2020-12-15 中北大学南通智能光机电研究院 Displacement sensor based on Talbot image and COMS camera structure
CN112526745A (en) * 2020-10-28 2021-03-19 南京信息工程大学 Optical lens design method based on thermal flow field
US11821755B1 (en) * 2023-07-19 2023-11-21 Mloptic Corp. Moiré-based distance measurement method

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CN107764518A (en) * 2017-09-26 2018-03-06 北京空间机电研究所 A kind of optical lens focal length measuring equipment and method
CN107941473A (en) * 2017-12-06 2018-04-20 西南技术物理研究所 A kind of Long focal length measurement device with fringe contrast automatic regulation function
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CN109741231A (en) * 2018-12-27 2019-05-10 浙江大学 It is a kind of to take the photograph screen picture source tracing method based on moire fringes
CN110631509A (en) * 2019-10-10 2019-12-31 南京理工大学 Object surface curvature detection system and method based on grating Talbot image
CN110631509B (en) * 2019-10-10 2021-10-08 南京理工大学 Object surface curvature detection system and method based on grating Talbot image
CN112082490A (en) * 2020-10-21 2020-12-15 中北大学南通智能光机电研究院 Displacement sensor based on Talbot image and COMS camera structure
CN112526745A (en) * 2020-10-28 2021-03-19 南京信息工程大学 Optical lens design method based on thermal flow field
CN112526745B (en) * 2020-10-28 2022-04-01 南京信息工程大学 Optical lens design method based on thermal flow field
US11821755B1 (en) * 2023-07-19 2023-11-21 Mloptic Corp. Moiré-based distance measurement method

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