CN103063415B - A kind of long focus length of lens measuring method based on Moire fringe coupling - Google Patents
A kind of long focus length of lens measuring method based on Moire fringe coupling Download PDFInfo
- Publication number
- CN103063415B CN103063415B CN201310001055.XA CN201310001055A CN103063415B CN 103063415 B CN103063415 B CN 103063415B CN 201310001055 A CN201310001055 A CN 201310001055A CN 103063415 B CN103063415 B CN 103063415B
- Authority
- CN
- China
- Prior art keywords
- long
- measured
- ronchi grating
- focal length
- focus lens
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 14
- 230000008878 coupling Effects 0.000 title claims abstract description 10
- 238000010168 coupling process Methods 0.000 title claims abstract description 10
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 10
- 239000005338 frosted glass Substances 0.000 claims description 7
- 239000011521 glass Substances 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 8
- 238000003384 imaging method Methods 0.000 abstract 1
- 238000001514 detection method Methods 0.000 description 5
- 230000004927 fusion Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
Landscapes
- Testing Of Optical Devices Or Fibers (AREA)
Abstract
The invention discloses a kind of long focus length of lens measuring method based on Moire fringe coupling, the method adopts diverging light as light source, gather a Moire fringe by CCD camera when not adding long-focus lens to be measured, measure now light source to the focal length of the initial divergence light beam at the first Ronchi grating place; Put into long-focus lens to be measured, movable light source, the Moire fringe of CCD collection is just the same with first time Moire fringe heretofore, the combined focal length of so new divergent beams and lens to be measured and the focal length of initial divergence light beam
identical, thus obtain the focal length of long-focus lens to be measured
Description
Technical field
The invention belongs to optical testing art, particularly relate to a kind of long focus length of lens measuring method based on 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 needs of the mankind, thus obtains controlled nuclear fusion energy source, makes the mankind thoroughly break away from energy starved puzzlement.Long-focus lens is basic components very crucial in inertial confinement fusion, and play more and more important effect, and required focal length is more and more longer, 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 current high precision test is particularly accurate to several millimeters even measurement of hundreds of micron and still there is a lot of difficulty, the impact that such as high-precision detection is subject to external interference particularly air turbulence and external shock is difficult to eliminate, and in detection system, the aberration of lens to be measured also increases along with the measurement impact of the increase focusing position of focal length, is difficult to realize high-acruracy survey.Therefore the high precision Long focal length measurement method and apparatus being easy to realize has very large application space and very important application.
Applicant has applied for that a number of patent application is 201110252061.3 for 2011, name is called the patent of invention of " a kind of focal length pick-up unit of high precision long-focus lens ", a kind of method that focal length detects is refer in the instructions of this patent, the method needs the grid line angle of measurement first Ronchi grating and the second Ronchi grating to calculate 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 limits the raising of focometry precision.
Summary of the invention
The object of the invention is for the deficiencies in the prior art, provide a kind of long focus length of lens measuring method based on moiré topography coupling.The present invention adopts the method for coupling Moire fringe, does not need the grid line angle of measurement first Ronchi grating and the second Ronchi grating, improves the focal length accuracy of detection of long-focus lens.
The object of the invention is to be achieved through the following technical solutions: a kind of long focus length of lens measuring method based on Moire fringe coupling, comprises the following steps:
Step 1: the light that laser instrument sends forms an initial divergence light beam after microcobjective and pin hole, incide on the first Ronchi grating, reenter and be mapped to the second Ronchi grating, regulate the distance between the first Ronchi grating and the second Ronchi grating, the Taibo picture of the first Ronchi grating and the second Ronchi grating is made to form Moire fringe on frosted glass, gather striped by CCD camera, obtain initial stripe angle
; Measure now pin hole to the distance of the first Ronchi grating
,
be the focal length of initial divergence light beam;
Step 2: put into long-focus lens to be measured between pin hole and the first Ronchi grating;
Step 3: synchronizing moving laser instrument, microcobjective and pin hole, the light that laser instrument sends forms new divergent beams after microcobjective and pin hole, incide on long-focus lens to be measured, again through the first Ronchi grating and the second Ronchi grating, Taibo picture and second Ronchi grating of the first Ronchi grating form new Moire fringe on frosted glass, gather striped by CCD camera, obtain now stripe angle
;
Step 4: contrast
with
if,
, so new divergent beams are identical with the focal length of initial divergence light beam with the combined focal length of lens to be measured, enter next step; If
with
unequal, then repeat step 3, until
;
Step 5: measure now pin hole to the distance of long-focus lens front surface to be measured
with the distance of long-focus lens front surface to be measured to the first Ronchi grating
; By combined focal length formula:
The focal length of lens to be measured can be obtained
;
In formula,
for the center thickness of long-focus lens to be measured,
for the refractive index of long-focus lens glass to be measured,
for the radius-of-curvature of long-focus lens front surface to be measured,
for the radius-of-curvature of long-focus lens rear surface to be measured.
The invention has the beneficial effects as follows:
1. the present invention uses Moire fringe matching technique, is compared to traditional long-focus measuring technology based on Moire fringe, does not need measurement two grating grid angle.Before and after using, twice Moire fringe angle is identical as criterion, and occurrence is not used in the focal length calculating long-focus lens to be measured.
2. the present invention may be used for the focal range detecting several meters to tens meters, laser instrument, microcobjective, pin hole can be mobile along optical axis precision, when measuring different focal lens, mobile laser instrument, microcobjective, pin hole is only needed to reach suitable position, just can focal length measurement and have high repeatability precision accurately, light path is simple, is easy to realize.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of step 1 of the present invention;
Fig. 2 is the schematic diagram of step 2 of the present invention and 3;
In figure: laser instrument 1, object lens 2, pin hole 3, first Ronchi grating 4, 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 comprises the following steps:
Step 1: as shown in Figure 1, the light that laser instrument 1 sends forms an initial divergence light beam after microcobjective 2 and pin hole 3, incide on the first Ronchi grating 4, reenter and be mapped to the second Ronchi grating 5, regulate the distance between the first Ronchi grating 4 and the second Ronchi grating 5, make the Taibo picture of the first Ronchi grating 4 and the second Ronchi grating 5 form Moire fringe on frosted glass 6, gather striped by CCD camera 7, obtain initial stripe angle
; Measure the distance of now pin hole 3 to the first Ronchi grating 4
,
be the focal length of initial divergence light beam.
Step 2: as shown in Figure 2, puts into long-focus lens 8 to be measured between pin hole 3 and the first Ronchi grating 4.
Step 3: synchronizing moving laser instrument 1, microcobjective 2 and pin hole 3.The light that laser instrument 1 sends forms new divergent beams after microcobjective 2 and pin hole 3, incide on long-focus lens 8 to be measured, again through the first Ronchi grating 4 and the second Ronchi grating 5, Taibo picture and second Ronchi grating 5 of the first Ronchi grating 4 form new Moire fringe on frosted glass 6, gather striped by CCD camera 7, obtain now stripe angle
.
Step 4: contrast
with
if,
, so new divergent beams are identical with the focal length of initial divergence light beam with the combined focal length of lens to be measured, enter next step; If
with
unequal, then repeat step 3, until
.
Step 5: measure now pin hole 3 and arrive the distance of long-focus lens 8 front surface to be measured
with the distance of long-focus lens 8 front surface to be measured to the first Ronchi grating 4
.By combined focal length formula:
The focal length of lens to be measured can be obtained
.
In formula,
for the center thickness of long-focus lens to be measured,
for the refractive index of long-focus lens glass to be measured,
for the radius-of-curvature of long-focus lens front surface to be measured,
for the radius-of-curvature of long-focus lens rear surface to be measured.
The long focus length of lens measuring method that application the present invention is based on Moire fringe coupling measures long focus length of lens, does not need the grid line angle of measurement first Ronchi grating and the second Ronchi grating, improves the focal length accuracy of detection of long-focus lens.
Claims (1)
1., based on a long focus length of lens measuring method for Moire fringe coupling, it is characterized in that, comprise the following steps:
Step 1: the light that laser instrument (1) sends forms an initial divergence light beam after microcobjective (2) and pin hole (3), incide on the first Ronchi grating (4), reenter and be mapped to the second Ronchi grating (5), regulate the distance between 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) is made to form Moire fringe on frosted glass (6), gather striped by CCD camera (7), obtain initial stripe angle
; Measure now pin hole (3) to the distance of the first Ronchi grating (4)
,
be the focal length of initial divergence light beam;
Step 2: put into long-focus lens to be measured (8) between pin hole (3) and the first Ronchi grating (4);
Step 3: synchronizing moving laser instrument (1), microcobjective (2) and pin hole (3), the light that laser instrument (1) sends forms new divergent beams after microcobjective (2) and pin hole (3), incide on 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) above form new Moire fringe at frosted glass (6), gather striped by CCD camera (7), obtain now stripe angle
;
Step 4: contrast
with
if,
, so new divergent beams are identical with the focal length of initial divergence light beam with the combined focal length of lens to be measured, enter next step; If
with
unequal, then repeat step 3, until
;
Step 5: measure now pin hole (3) to the distance of long-focus lens to be measured (8) front surface
with the distance of long-focus lens to be measured (8) front surface to the first Ronchi grating (4)
; Namely by combined focal length formula:
Obtain the focal length of lens to be measured
;
In formula,
for the center thickness of long-focus lens to be measured,
for the refractive index of long-focus lens glass to be measured,
for the radius-of-curvature of long-focus lens front surface to be measured,
for the radius-of-curvature of long-focus lens rear surface to be measured.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310001055.XA CN103063415B (en) | 2013-01-05 | 2013-01-05 | A kind of long focus length of lens measuring method based on Moire fringe coupling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310001055.XA CN103063415B (en) | 2013-01-05 | 2013-01-05 | A kind of long focus length of lens measuring method based on Moire fringe coupling |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103063415A CN103063415A (en) | 2013-04-24 |
| CN103063415B true CN103063415B (en) | 2015-09-02 |
Family
ID=48106133
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310001055.XA Active CN103063415B (en) | 2013-01-05 | 2013-01-05 | A kind of long focus length of lens measuring method based on Moire fringe coupling |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103063415B (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105737763B (en) * | 2014-12-11 | 2018-03-13 | 高瑞 | A kind of spherical mirror curvature radius measurement method based on Moire fringe |
| 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 |
| CN107764518B (en) * | 2017-09-26 | 2019-07-12 | 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 |
| CN109741231B (en) * | 2018-12-27 | 2020-10-16 | 浙江大学 | Screen shooting picture tracing method based on Moire patterns |
| 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 |
| CN112082490B (en) * | 2020-10-21 | 2022-02-08 | 中北大学南通智能光机电研究院 | Displacement sensor based on Talbot image and COMS camera structure |
| 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 |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005214807A (en) * | 2004-01-29 | 2005-08-11 | Fujinon Corp | Grid projection type moire device |
| CN101403650A (en) * | 2008-11-21 | 2009-04-08 | 北京理工大学 | Differential confocal combination ultra-long focal length measuring method and apparatus |
| CN101408478A (en) * | 2008-11-21 | 2009-04-15 | 北京理工大学 | Method and apparatus for measuring cofocal combined ultra-long focal distance |
| CN101493376A (en) * | 2009-03-06 | 2009-07-29 | 北京理工大学 | Pentaprism combination ultralong focal-length measurement method and apparatus |
| CN101852676A (en) * | 2010-05-10 | 2010-10-06 | 北京理工大学 | Method and device for multifocal holographic differential confocal super-long focus measurement |
| CN102252824A (en) * | 2011-04-12 | 2011-11-23 | 浙江大学 | Compound differential type long-focus measuring device based on Talbot effect |
| CN102313642A (en) * | 2011-08-30 | 2012-01-11 | 浙江大学 | High-precision focus detection device for long-focus lens |
| CN102331336A (en) * | 2011-06-15 | 2012-01-25 | 浙江大学 | Method and device for measuring focal distance of long-focal-length and large-aperture lens |
| CN102589851A (en) * | 2012-01-16 | 2012-07-18 | 北京理工大学 | Method for measuring focal length of reflection type confocal lens |
-
2013
- 2013-01-05 CN CN201310001055.XA patent/CN103063415B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005214807A (en) * | 2004-01-29 | 2005-08-11 | Fujinon Corp | Grid projection type moire device |
| CN101403650A (en) * | 2008-11-21 | 2009-04-08 | 北京理工大学 | Differential confocal combination ultra-long focal length measuring method and apparatus |
| CN101408478A (en) * | 2008-11-21 | 2009-04-15 | 北京理工大学 | Method and apparatus for measuring cofocal combined ultra-long focal distance |
| CN101493376A (en) * | 2009-03-06 | 2009-07-29 | 北京理工大学 | Pentaprism combination ultralong focal-length measurement method and apparatus |
| CN101852676A (en) * | 2010-05-10 | 2010-10-06 | 北京理工大学 | Method and device for multifocal holographic differential confocal super-long focus measurement |
| CN102252824A (en) * | 2011-04-12 | 2011-11-23 | 浙江大学 | Compound differential type long-focus measuring device based on Talbot effect |
| CN102331336A (en) * | 2011-06-15 | 2012-01-25 | 浙江大学 | Method and device for measuring focal distance of long-focal-length and large-aperture lens |
| CN102313642A (en) * | 2011-08-30 | 2012-01-11 | 浙江大学 | High-precision focus detection device for long-focus lens |
| CN102589851A (en) * | 2012-01-16 | 2012-07-18 | 北京理工大学 | Method for measuring focal length of reflection type confocal lens |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103063415A (en) | 2013-04-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103063415B (en) | A kind of long focus length of lens measuring method based on Moire fringe coupling | |
| CN102313642B (en) | High-precision focus detection device for long-focus lens | |
| CN102589851B (en) | Method for measuring focal length of reflection type confocal lens | |
| CN103063414B (en) | Focal length measuring device adopting symmetrical grating | |
| CN102589854B (en) | Method for measuring focal length of reflection type differential confocal lens | |
| CN104567738A (en) | System and method for precisely measuring optical axis parallelism | |
| CN103017681B (en) | Real time detecting method for rotary shaft symmetrically concave aspheric surfaces approximate to paraboloids | |
| CN102879182B (en) | Method for measuring off-axis aspheric surface eccentricity by laser tracker | |
| CN203216702U (en) | Focal length measuring device for long focal length optical system | |
| CN102252824B (en) | Compound differential type long-focus measuring device based on Talbot effect | |
| CN102589852B (en) | Autocollimating type confocal method for measuring focal length of lens | |
| CN103969787A (en) | Initial assembly positioning method for four off-axis lenses | |
| CN102937421B (en) | Real-time detection method of symmetrical optical non-spherical face of rotary shaft | |
| CN102589853B (en) | Focal length measuring method of auto-collimating differential confocal lens | |
| CN101408478A (en) | Method and apparatus for measuring cofocal combined ultra-long focal distance | |
| CN104075881A (en) | Parallel error measuring method suitable for multiband common-path telescope | |
| CN104535300A (en) | Large-diameter collimator wavefront and image surface position calibration device and method | |
| CN104316082A (en) | Theodolite external field infinite remote calibration method | |
| CN107589518A (en) | Optical lens and the laser alignment measuring apparatus with the optical lens | |
| CN102853992B (en) | Method for improving installation accuracy of collimator tube reticle | |
| CN108507501B (en) | Portable artillery multi-barrel axis parallelism detector | |
| CN109151461B (en) | Method for testing angle deviation of focusing optical axis of high-precision tracking camera | |
| CN203298974U (en) | Digital type white light sighting telescope comprehensive calibration instrument | |
| CN114459618B (en) | Fizeau interferometer wavelength meter and optical device for measuring laser | |
| CN102322839B (en) | Device and method for measuring light emergent angle of optical virtual light source |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |