CN108692919A - Camera lens thermal lensing effect detection method - Google Patents
Camera lens thermal lensing effect detection method Download PDFInfo
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- CN108692919A CN108692919A CN201710218456.9A CN201710218456A CN108692919A CN 108692919 A CN108692919 A CN 108692919A CN 201710218456 A CN201710218456 A CN 201710218456A CN 108692919 A CN108692919 A CN 108692919A
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- camera lens
- mark
- thermal lensing
- laser marking
- lensing effect
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/02—Testing optical properties
- G01M11/0242—Testing optical properties by measuring geometrical properties or aberrations
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- Analytical Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Laser Beam Processing (AREA)
Abstract
The embodiment of the invention discloses a kind of camera lens thermal lensing effect detection methods, are related to technical field of laser processing.The camera lens thermal lensing effect detection method includes:Camera lens is mounted on laser marking machine and mark inclined-plane is set;By the laser marking machine on the mark inclined-plane mark straight line;The laser marking machine carries out out light processing, by the laser marking machine on the mark inclined-plane mark Article 2 straight line;Find out camera lens focal length variations amount caused by thermal lensing effect.It is convenient, pollution-free that camera lens thermal lensing effect detection method described in the embodiment of the present invention measures, the focus offset of thermal lensing effect influence camera lens, which can not only be measured, can also measure the direction of offset, and adapt to different mark camera lenses, conveniently select excellent camera lens, be conducive to the practical application of camera lens, it is economically cost-effective, and promote the effect of laser labelling and the uniformity of production in production.
Description
Technical field
The present embodiments relate to technical field of laser processing, especially camera lens thermal lensing effect detection method.
Background technology
After optical element is excited the light beam Continuous irradiation long period, thermal deformation is generated since temperature raises, so as to cause saturating
The reflection direction of the refractive index and reflective optical components of crossing type optical element changes, and this phenomenon belongs to thermal lens effect
It answers.For laser marking equipment, the laser of the isolator head output of laser can pass through the focal position of field lens to material
Mark is carried out, thermal lensing effect mainly generates on field lens.After the generation of thermal lensing effect can be to the pattern of laser and focusing
Focal position have an impact, cause mark effect be deteriorated, influence production uniformity.Therefore it needs to camera lens thermal lensing effect
Caused focal length variations are tested, and select more excellent camera lens.
Inventor has found at least there is following technical problem in the prior art during studying the application:
In camera lens test method traditional at present, the focal length and working range of testing lens, and it is existing in the use of camera lens
, if there is thermal lens effect, it is seen that light dies down, and when seriously affecting mark effect, it is common practice to stop mark, again
Focus is found, this process delays production and time, and this way carries certain blindness, can not determine camera lens movement side
To lacking the measurement method of corresponding camera lens thermal lens effect.
Invention content
The embodiment of the present invention is the technical problem to be solved is that, lack a kind of side that measurement camera lens is influenced by thermal lensing effect
Method, so that the excellent camera lens for improving mark effect and producing uniformity can not be selected.
In order to solve the above-mentioned technical problem, a kind of camera lens thermal lensing effect detection method described in the embodiment of the present invention uses
Technical solution as described below:
A kind of camera lens thermal lensing effect detection method, including:
Camera lens is mounted on laser marking machine and mark inclined-plane is set;
By the laser marking machine on the mark inclined-plane mark straight line;
The laser marking machine carries out out light processing so that the camera lens generates thermal lensing effect;
It is described go out light processing after, by the laser marking machine on the mark inclined-plane mark Article 2 straight line;According to
Offset on the mark inclined-plane between the straight line and the Article 2 straight line finds out the camera lens because of thermal lens
Focal length variations amount caused by effect.
Further, the camera lens thermal lensing effect detection method, the camera lens use vitreous silica camera lens.
Further, the camera lens thermal lensing effect detection method, the laser marking machine are beaten on the mark inclined-plane
When marking the straight line with the Article 2 straight line, the laser beam of the laser marking machine and the mark inclined-plane are kept
Plane perpendicular.
Further, the camera lens thermal lensing effect detection method when laser marking machine carries out out light processing, is kept
The laser marking machine and the mark incline position are constant.
Further, the camera lens thermal lensing effect detection method, it is described go out light processing be the laser marking machine with most
High-power output beam 30 minutes or more.
Further, the camera lens thermal lensing effect detection method, the straight line and the Article 2 straight line
Length is the maximum value of the camera lens mark range.
Further, the camera lens thermal lensing effect detection method, the laser marking machine carry out out the front and back of light processing,
The mark parameter of the laser marking machine is consistent;The mark parameter includes:Pulse width, laser repetition rate, mark
Speed and packed density.
Further, the camera lens thermal lensing effect detection method, it is described to find out the camera lens because thermal lensing effect causes
Focal length variations amount include:Focal length variations amount caused by thermal lensing effect is found out according to formula △ H=d*sin (a), wherein △ H
For the focal length variations amount, offsets of the d between two mark straight lines, a is the angle of inclination on the inclined-plane.
Compared with prior art, the embodiment of the present invention mainly has following advantageous effect:
The embodiment of the invention discloses a kind of camera lens thermal lensing effect detection methods, are related to technical field of laser processing.Institute
Stating camera lens thermal lensing effect detection method includes:Camera lens is mounted on laser marking machine and mark inclined-plane is set;By described
Laser marking machine mark straight line on the mark inclined-plane;The laser marking machine carries out out light processing, by described
Laser marking machine mark Article 2 straight line on the mark inclined-plane;Camera lens focal length caused by thermal lensing effect is found out to become
Change amount.It is convenient, pollution-free that camera lens thermal lensing effect detection method described in the embodiment of the present invention measures, and can not only measure thermal lens
The focus offset of effects camera lens can also measure the direction of offset, and adapt to different mark camera lenses, conveniently select
Excellent camera lens is conducive to the practical application of camera lens, economically cost-effective, and promotes the effect of laser marking and life in production
The uniformity of production.
Description of the drawings
Fig. 1 is the implementation schematic diagram of camera lens thermal lensing effect detection method of the embodiment of the present invention;
Fig. 2 is the data statistics figure of camera lens thermal lensing effect detection method of the embodiment of the present invention.
Specific implementation mode
To facilitate the understanding of the present invention, invention is described more fully below with reference to relevant drawings.It is given in attached drawing
Presently preferred embodiments of the present invention is gone out.But the present invention realizes in many different forms, however it is not limited to described herein
Embodiment.It is made the disclosure of the present invention more thorough and comprehensive on the contrary, purpose of providing these embodiments is.
Unless otherwise defined, all of technologies and scientific terms used here by the article and belong to the technical field of the present invention
The normally understood meaning of technical staff is identical.Used term is intended merely to description tool in the description of the invention herein
The purpose of the embodiment of body, it is not intended that in the limitation present invention.Claims of the present invention, specification and Figure of description
In term " first ", " second " etc. be for distinguishing different objects, rather than for describing particular order.
It is the implementation schematic diagram of camera lens thermal lensing effect detection method of the embodiment of the present invention with reference to figure 1.Wherein, left figure is
The side view on mark inclined-plane, mark inclined-plane top have the laser beam projected by laser marking machine, laser marking machine operation to swash
Light beam carries out mark with the angle perpendicular to mark inclined-plane bottom surface on mark inclined-plane, and the angle on mark inclined-plane is a.Right figure is institute
State the front view on mark inclined-plane, the straight line on the left side is the mark line before light processing on mark inclined-plane, and on mark inclined-plane the right
Straight line is light extraction treated mark line, it is illustrated that in offset between two mark straight lines be d.
In laser marking machine, mark can also be arranged for emitting laser beam and executing laser marking in laser marking machine
Parameter.Laser marking machine carries out mark by its galvanometer system, and galvanometer system includes:X galvanometers and Y galvanometers, X galvanometers control laser
The X-axis of mark is moved towards, and Y galvanometers control the Y-axis trend of laser marking;X galvanometers include:Optical mirror and scan module;Optics
Speculum is used for reflection laser beam, and scan module is used to control the movement of optical mirror, and X galvanometers are identical as the construction of Y galvanometers.
Mark inclined-plane then is used to show the straight line of laser marking machine mark.
Camera lens thermal lensing effect detection method described in the embodiment of the present invention is applied to above-mentioned testing lens thermal lensing effect
Device, including:
Step 1:Camera lens is mounted on laser marking machine and mark inclined-plane is set.
Wherein, the camera lens uses vitreous silica camera lens.
Step 2:By the laser marking machine on the mark inclined-plane mark straight line.
Step 3:The laser marking machine carries out out light processing so that the camera lens generates thermal lensing effect.
Step 4:It is described go out light processing after, by the laser marking machine, mark Article 2 is straight on the mark inclined-plane
Line.
When laser marking machine straight line described in mark on the mark inclined-plane is with the Article 2 straight line,
Keep the plane perpendicular of the laser beam and the mark inclined-plane of the laser marking machine.And carry out light extraction in the laser marking machine
When processing, keep the laser marking machine and the mark incline position constant.It is described go out light processing be the laser marking machine
With maximum power output light beam 30 minutes or more.The straight line of mark and the length of the Article 2 straight line are institute
The maximum value for stating camera lens mark range, generally in 85mm or more.The laser marking machine carries out out the front and back of light processing, described to swash
The mark parameter of light marking machine is consistent;The mark parameter includes:Pulse width, laser repetition rate, mark speed and
Packed density.
Step 5:According to the offset on the mark inclined-plane between the straight line and the Article 2 straight line, ask
Go out camera lens focal length variations amount caused by thermal lensing effect.
The camera lens focal length variations amount caused by thermal lensing effect that finds out specifically includes:According to formula △ H=d*
Sin (a) finds out focal length variations amount caused by thermal lensing effect, wherein △ H are the focal length variations amount, and d is two marks
Offset between straight line, a are the angle of inclination on the inclined-plane.
Camera lens thermal lensing effect detection method described in the embodiment of the present invention, before going out light processing by detection laser marking machine
The offset between the straight line of mark calculates camera lens focal length variations amount caused by thermal lensing effect afterwards, is imitated to camera lens thermal lens
The influence answered is detected, and the detection method is easy to operate, and detection process automatically completes, and adapts to different mark mirrors
Head facilitates selecting for excellent camera lens, economically cost-effective, can promote the effect of laser marking and the unification of production in production
Property.
Those of ordinary skill in the art are to be understood that:Detector is the device of observation and record particle.Use tekite
The main function of English camera lens has:Edge light beam is improved to be incident on the ability of detector, make the non-homogeneous light on detector photosurface
According to be able to homogenization, can be with the curvature of field of compensation system and distortion etc..
Light extraction:Refer to laser and runs output beam.Laser marking is divided into positive burnt and defocusing:Hot spot is minimum when positive burnt,
Label is high-visible on material;Hot spot is bigger when defocusing, and laser beam energy is more dispersed, will shine at can not be clear
Label.By laser marking machine, mark straight line, straight line on the slope, not on a horizontal plane, have difference in height on the slope,
Its rear and front end, which reach a certain height after difference, can lead to lack light, and scarce light can lead to the place beyond straight line both ends because defocusing can not
Label.
In mark parameter, pulse width:Refer to single pulse duration, pulse width is smaller, the laser duration
Shorter, peak power is higher, and the destructive power of laser is bigger.Conversely, pulse width is bigger, the laser duration is longer, peak work
Rate is lower, and laser is mainly reflected in thermal energy.
Laser repetition rate:Refer to the pulse laser umber of pulse per second sent out, under same time, frequency is higher, simple venation
Rush that energy is smaller, the destructive power of laser is also smaller, and laser is mainly reflected in thermal energy at this time.
Mark speed:Mark speed is faster, and laser pulse residence time is shorter, heat distribute it is faster, conversely, mark is fast
Degree is slower, and laser residence action time is longer, and heat build-up is not easy to distribute.
Packed density:Since laser marking is line scan mode, i.e., line is formed with laser pulse, pressed successively toward a direction
It is superimposed according to certain spacing, achievees the effect that mark is completely covered in laser, packed density is enough just, too close to influence processing instead
Efficiency.
Further citing illustrates camera lens thermal lensing effect detection method described in the embodiment of the present invention below:
Prepare six sections of vitreous silica camera lenses, model is respectively:SL-1064-112-160Q,SL-1064-112-163Q,
TSL-1064-90-163Q-D15, TelecentricF167, Linos-f167 and self-control 03.03.3081.With pulse wavelength
For two infrared optical fiber the laser marking machine IPG-100W and IPG-200W of 1055nm-1075nm, mark ginseng when mark
Number:Mark speed is 500mm/s, pulse width 200ns, laser repetition rate 100KHz, packed density 0.03mm.
At this point, the camera lens thermal lensing effect detection method according to embodiments of the present invention, first by model SL-1064-
The vitreous silica camera lens of 112-160Q is on the infrared optical fiber laser marking machine of model IPG-100W, and it is oblique that mark is arranged
Face;Then by the infrared optical fiber laser marking machine on the mark inclined-plane mark straight line;The laser is kept to beat
Mark machine and the mark incline position are constant, after the laser marking machine is with maximum power light extraction 30 minutes or more, by described
Laser marking machine another straight line of mark on the mark inclined-plane;Then measure light extraction mark before and after the processing two are straight
Offset between line;Focal length variations amount caused by thermal lensing effect is found out further according to formula △ H=d*sin (a), wherein △ H
For the focal length variations amount, d is the offset between two straight lines that the light extraction marks before and after the processing, and a is the inclined-plane
Angle of inclination.Vitreous silica camera lens is replaced after recording detection data, respectively to model SL-1064-112-163Q, TSL-
1064-90-163Q-D15, TelecentricF167, Linos-f167 and make by oneself 03.03.3081 vitreous silica camera lens into
Row detection, then replaces the infrared optical fiber laser marking machine of model IPG-200W, again respectively to six sections of vitreous silica camera lenses
Test simultaneously recording detection data.
It is the data statistics figure of camera lens thermal lensing effect detection method of the embodiment of the present invention with reference to figure 2.The data statistics
Figure has recorded the part detection data of above-mentioned detection process.It can be seen from this figure that when using with a galvanometer, each camera lens it
Between the basic indifference of thermal lensing effect.Wherein, the vitreous silica camera lens of model TSL-1064-90-163Q-D15 is by thermal lens
Effects unobvious, effect are best.
Camera lens thermal lensing effect detection method described in the embodiment of the present invention according to measure laser marking machine light extraction before and after the processing
Offset between the straight line of mark calculates camera lens focal length variations amount caused by thermal lensing effect, judges camera lens heat penetration with this
The influence of mirror effect, and pick out excellent camera lens according to the detection data of different camera lenses, detection process is easy to operate, without dirt
Dye, and different mark camera lenses is adapted to, be conducive to the actual use of camera lens, promote the effect of laser marking and production in production
Uniformity.
The present invention is not limited to the above embodiment, the above is the preferred embodiment of the present invention, which only uses
In illustrating the present invention rather than limit the scope of the invention, it is noted that those skilled in the art are come
It says, without departing from the principle of the present invention, some improvements and modifications can also be made, the improvement of such equivalent forms and repair
Decorations also should be regarded as including within the scope of the present invention.
Claims (8)
1. a kind of camera lens thermal lensing effect detection method, which is characterized in that including:
Camera lens is mounted on laser marking machine and mark inclined-plane is set;
By the laser marking machine on the mark inclined-plane mark straight line;
The laser marking machine carries out out light processing so that the camera lens generates thermal lensing effect;
It is described go out light processing after, by the laser marking machine on the mark inclined-plane mark Article 2 straight line;
According to the offset on the mark inclined-plane between the straight line and the Article 2 straight line, the camera lens is found out
The focal length variations amount caused by thermal lensing effect.
2. camera lens thermal lensing effect detection method according to claim 1, which is characterized in that the camera lens uses tekite
English camera lens.
3. camera lens thermal lensing effect detection method according to claim 1, which is characterized in that the laser marking machine is in institute
When stating straight line described in mark and the Article 2 straight line on mark inclined-plane, the laser beam of the laser marking machine is kept
With the plane perpendicular on the mark inclined-plane.
4. camera lens thermal lensing effect detection method according to claim 3, which is characterized in that the laser marking machine carries out
When going out light processing, keep the laser marking machine and the mark incline position constant.
5. camera lens thermal lensing effect detection method according to claim 4, which is characterized in that it is described go out light processing be described
Laser marking machine is with maximum power output light beam 30 minutes or more.
6. camera lens thermal lensing effect detection method according to claim 5, which is characterized in that the straight line and institute
The length for stating Article 2 straight line is the maximum value of the camera lens mark range.
7. camera lens thermal lensing effect detection method according to claim 1, which is characterized in that the laser marking machine carries out
Go out the front and back of light processing, the mark parameter of the laser marking machine is consistent;The mark parameter includes:Pulse width swashs
Light repetition rate, mark speed and packed density.
8. camera lens thermal lensing effect detection method according to claim 1, which is characterized in that it is described find out the camera lens because
Focal length variations amount caused by thermal lensing effect includes:Focal length caused by thermal lensing effect is found out according to formula △ H=d*sin (a)
Variable quantity, wherein △ H are the focal length variations amount, and offsets of the d between two mark straight lines, a is the inclined-plane
Angle of inclination.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710218456.9A CN108692919B (en) | 2017-04-05 | 2017-04-05 | Lens thermal lens effect detection method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710218456.9A CN108692919B (en) | 2017-04-05 | 2017-04-05 | Lens thermal lens effect detection method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113369681A (en) * | 2021-05-26 | 2021-09-10 | 力神动力电池系统有限公司 | Detection apparatus for laser welding focus |
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| CN101013061A (en) * | 2006-12-26 | 2007-08-08 | 中国人民解放军国防科学技术大学 | Method for measuring focus and equivalent f coefficient using optical grating type wave-front curvature sensing unit |
| WO2013007460A1 (en) * | 2011-07-08 | 2013-01-17 | Carl Zeiss Smt Gmbh | Method and apparatus for determining the absorption in a blank |
| CN102889981A (en) * | 2012-10-15 | 2013-01-23 | 中国科学院上海光学精密机械研究所 | Device and method for measuring thermal focus of side pumped laser crystal |
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