CN106840408A - A kind of detection means and detection method of imaging lens optic back focal - Google Patents
A kind of detection means and detection method of imaging lens optic back focal Download PDFInfo
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- CN106840408A CN106840408A CN201710011223.1A CN201710011223A CN106840408A CN 106840408 A CN106840408 A CN 106840408A CN 201710011223 A CN201710011223 A CN 201710011223A CN 106840408 A CN106840408 A CN 106840408A
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- 238000003384 imaging method Methods 0.000 title claims abstract description 75
- 238000001514 detection method Methods 0.000 title claims abstract description 74
- 230000003287 optical effect Effects 0.000 claims abstract description 25
- 239000004606 Fillers/Extenders Substances 0.000 claims abstract description 23
- 230000009897 systematic effect Effects 0.000 claims abstract description 18
- 238000005259 measurement Methods 0.000 claims abstract description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- 239000004411 aluminium Substances 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 2
- 238000000576 coating method Methods 0.000 claims description 2
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 5
- 239000011159 matrix material Substances 0.000 description 3
- 238000001931 thermography Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000002310 reflectometry Methods 0.000 description 1
- 238000009738 saturating Methods 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J2005/0077—Imaging
Abstract
The invention discloses a kind of detection means and detection method of imaging lens optic back focal, belong to optical lens technical field；Detection means includes infrared light supply, target, collimator and extender mirror, spectroscope, total reflection lens, standard lens, Infrared Detectors and the control device of sequential, and with an adjustable working condition；Detection method includes：The position adjustment of each part is same high and coaxial to center in detection means；Spectroscope is adjusted to systematic optical axis in angle of 45 degrees；Standard lens and Infrared Detectors are adjusted to the position for making Infrared Detectors be located at its back focal plane；By standard lens and Infrared Detectors adjust to systematic optical axis into 90 degree of angles；Adjustment Infrared Detectors is so as to target into sharply defined image；Measurement obtains the distance between imaging lens and total reflection lens as optic back focal value.The beneficial effect of above-mentioned technical proposal is：Realize that optic back focal is detected, simple structure and accuracy of detection is higher.
Description
Technical field
The present invention relates to optical lens technical field, more particularly to a kind of imaging lens optic back focal detection means and
Detection method.
Background technology
The optic back focal of camera lens is typically one of important parameter of camera lens, and its numerical value difference directly affects the imaging matter of camera lens
Amount.The difference of optic back focal numerical value is typically by the group of the mismachining tolerance of optical work, the mismachining tolerance of structural member and camera lens
What many factors such as error long caused, therefore generally need to be monitored optic back focal after camera lens completion.
Compared with visible light lens, the operating temperature range of imaging lens is wider, and infra-red material and visible ripple
The glass material that section is used is compared, and the relatively more sensitive therefore higher temperature refraction rate coefficient of its change to temperature, temperature become
The factors such as interval variation during change between the radius of curvature of optical surface, the thickness of optical element and element cause infrared optics
System is bigger compared to visible optical system temperature influence.Then for imaging lens, except under detection normal temperature condition
Outside optic back focal, in addition it is also necessary to detect the skew of the lower imaging lens optic back focal of high/low temperature focusing.As can be seen here, to thermal imaging
The optic back focal detection of camera lens is more complicated compared to visible light lens.
And in the prior art, for imaging lens parameter detecting especially optic back focal detect method, device with
And examination criteria lacks compared with visible light lens, the not detection method for imaging lens of standard of comparison in the prior art
And device so that the relevant parameter detection of imaging lens is more difficult to be carried out.
The content of the invention
For the above-mentioned problems in the prior art, now provide a kind of imaging lens optic back focal detection means and
The technical scheme of detection method, it is intended to realize the optic back focal detection of imaging lens, simple structure and accuracy of detection is higher.
Above-mentioned technical proposal is specifically included：
A kind of detection means of imaging lens optic back focal, wherein, including sequential infrared light supply, target, standard
Straight beam expanding lens, spectroscope, total reflection lens, standard lens, Infrared Detectors and control device；
The collimator and extender mirror is arranged in one first adjustment frame, and the standard lens is connected with the Infrared Detectors,
The Infrared Detectors is arranged in one second adjustment frame, and the control device is connected with the Infrared Detectors；
The control device is used to control the Infrared Detectors, and described in display screen display in the control device
The image of Infrared Detectors；
The detection means has an adjustable working condition, under the working condition：
It is complete with described that the imaging lens of the eyeglass that will be from top to bottom laminated including multi-disc are arranged on the spectroscope
Between reflection lens；
The infrared light supply, the target, the collimator and extender mirror, the imaging lens and the total reflection lens
Center is with high and coaxial；
In angle of 45 degrees, and spectroscopical center and the systematic optical axis are with high for the spectroscope and systematic optical axis；
The Infrared Detectors is located at the position of the back focal plane of the standard lens, and the standard lens, described red
External detector and spectroscopical center with high, the standard lens and the Infrared Detectors respectively with the systematic optical axis
Into 90 degree of angles；
The distance between the imaging lens and described total reflection lens are adjusted, so that the Infrared Detectors is to described
Target is into sharply defined image；
Measurement obtains the distance between the eyeglass of bottom in the imaging lens and described total reflection lens and makees
For the imaging lens optic back focal value and export.
Preferably, the detection means, wherein, wherein, first adjustment frame is four-dimensional adjustable adjustment frame.
Preferably, the detection means, wherein, second adjustment frame is three-dimensional adjustable adjustment frame.
Preferably, the detection means, wherein, the spectroscope towards the imaging lens one side be reflecting surface, institute
State spectroscope towards the collimator and extender mirror one side be transparent area.
Preferably, the detection means, wherein, spectroscopical reflecting surface is 50% reflection for penetrating 50% reflection
Film layer.
Preferably, the detection means, wherein, the total reflection lens are aluminium plane mirror.
Preferably, the detection means, wherein, the Infrared Detectors is to stare focus planardetector.
Preferably, the detection means, wherein, the Infrared Detectors is the long wave non-brake method being operated under 8-12 mum wavelengths
Detector.
A kind of detection method of imaging lens optic back focal, wherein, there is provided a detection means, the detection means includes
The infrared light supply of sequential, target, collimator and extender mirror, spectroscope, total reflection lens, standard lens, Infrared Detectors and control
Device processed；
The collimator and extender mirror is arranged in one first adjustment frame, and the standard lens is connected with the Infrared Detectors,
The Infrared Detectors is arranged in one second adjustment frame, and the control device is connected with the Infrared Detectors；
The control device is used to control the Infrared Detectors, and described in display screen display in the control device
The image of Infrared Detectors；
The detection method includes：
Step S1, will include the imaging lens of eyeglass that multi-disc from top to bottom be laminated be arranged on the spectroscope with
Between the total reflection lens；
Step S2, by the infrared light supply, the target, the collimator and extender mirror, imaging lens and described complete
The position adjustment of reflection lens is to center with high and coaxial；
Step S3, the spectroscope is adjusted to systematic optical axis in angle of 45 degrees, and the spectroscope and the system
System optical axis is with high；
Step S4, by the standard lens and the Infrared Detectors adjust to make the Infrared Detectors be located at the mark
The position of the back focal plane of quasi- camera lens；
Step S5, the standard lens and the Infrared Detectors are adjusted to respectively with the spectroscope with high and difference
With the systematic optical axis into 90 degree of angles；
Step S6, adjusts the distance between the imaging lens and described total reflection lens, so that the infrared acquisition
Device is to target into sharply defined image；
Step S7, measurement is obtained between the eyeglass of bottom in the imaging lens and the total reflection lens
Distance as the imaging lens optic back focal value and export.
The beneficial effect of above-mentioned technical proposal is：
1) a kind of detection means of imaging lens optic back focal is provided, the optic back focal inspection of imaging lens can be realized
Survey, simple structure and accuracy of detection is higher, and the optic back focal of the imaging lens under normal temperature condition can not only be detected, moreover it is possible to
Enough skews of the optic back focal of camera lens of the detection imaging lens under high/low temperature condition；
2) a kind of detection method of imaging lens optic back focal is provided, it would be preferable to support above-mentioned detection device is normally run.
Brief description of the drawings
During Fig. 1 is preferred embodiment of the invention, the structural representation of the detection means of imaging lens optic back focal；
During Fig. 2 is preferred embodiment of the invention, the schematic flow sheet of the detection method of imaging lens optic back focal.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art obtained on the premise of creative work is not made it is all its
His embodiment, belongs to the scope of protection of the invention.
It should be noted that in the case where not conflicting, the embodiment in the present invention and the feature in embodiment can phases
Mutually combination.
The invention will be further described with specific embodiment below in conjunction with the accompanying drawings, but not as limiting to the invention.
In preferred embodiment of the invention, based on problems of the prior art, a kind of imaging lens are now provided
The technical scheme of the detection means of optic back focal, the detection means is specific as shown in fig. 1, including sequential infrared light supply
1st, target 2, collimator and extender mirror 3, spectroscope 4, total reflection lens 6, standard lens 7, Infrared Detectors 8 and control device 9；
Specifically, in above-described embodiment：
Above-mentioned collimator and extender mirror 3 is arranged in one first adjustment frame (not shown)；
Above-mentioned standard camera lens 7 is connected with Infrared Detectors 8；
Above-mentioned Infrared Detectors 8 is arranged in one second adjustment frame (not shown)；
Above-mentioned control device 9 is connected with Infrared Detectors 8.
In above-described embodiment, above-mentioned control device 9 can be a control computer (PC).
In above-described embodiment, above-mentioned control device be used for Infrared Detectors is controlled, with control Infrared Detectors into
Picture, and the image of Infrared Detectors is included on the display screen of control device.
So-called standard lens, refers to the infrared lens of the standard that operation wavelength is consistent with above-mentioned imaging lens.Above-mentioned
In embodiment, above-mentioned standard camera lens 7 is as equally operated in the infrared lens of 8-12 μm of standard.
Then in above-described embodiment, above-mentioned detection device has an adjustable working condition, under the working condition：
1) will include that the imaging lens 5 of the eyeglass that multi-disc is from top to bottom laminated are arranged on spectroscope 4 and total reflection lens 6
Between；
2) center of above-mentioned infrared light supply 1, target 2, collimator and extender mirror 3, imaging lens 5 and total reflection lens 6 is with high
And it is coaxial (as shown in fig. 1)；
3) above-mentioned spectroscope 4 and systematic optical axis A in angle of 45 degrees, and spectroscope 4 center with systematic optical axis A with high；
4) above-mentioned Infrared Detectors 8 is located at the position of the back focal plane of standard lens 7, and the standard lens 7, infrared acquisition
The center of device 8 and spectroscope 4 with high, while the standard lens 7 and Infrared Detectors 8 respectively with systematic optical axis A into 90 degree of angles；
5) the distance between above-mentioned imaging lens 5 and total reflection lens 6 cause that Infrared Detectors 8 is clear to 2 one-tenth of target
Picture, that is, adjust the distance between above-mentioned imaging lens 5 and total reflection lens 6, so that Infrared Detectors 8 is to 2 one-tenth of target
Sharply defined image；
Then in above-described embodiment, above-mentioned imaging lens 5 include that the eyeglass that multi-disc is from top to bottom laminated (does not show in figure
Go out).Specifically, above-mentioned imaging lens 5 are existing imaging lens, therefore the wherein structure and overlapped way of eyeglass stacking
Will not be repeated here.
In above-described embodiment, above-mentioned imaging lens 5 are imaging lens of the service band at 8-12 μm.
In above-described embodiment, above-mentioned imaging lens can make a distinction as measurand with above-mentioned detection device, only
The imaging lens and detection means are applied in combination in the process that imaging lens are carried out with optic back focal detection.Show in Fig. 1
What is gone out is the working condition (detecting state) of detection means, therefore imaging lens 5 have been arranged on spectroscope in Fig. 1
Between 4 and total reflection lens 6.
In above-described embodiment, above-mentioned infrared light supply 1 can be the face source black matrix of a high temperature, and the temperature of the black matrix is not more than
Cross 1000 DEG C.Using high temperature blackbody the temperature stability of black matrix can be utilized to ensure the detection of detection means as infrared light supply 1
Stability.
In above-described embodiment, above-mentioned collimator and extender mirror 3 can be an infrared telescope head, using infrared telescope head conduct
Collimator and extender mirror 3 can reduce the manufacturing cost of whole detection means.
In above-described embodiment, above-mentioned control device 9 by the eyeglass of bottom in imaging lens 5 and total reflection lens 6 it
Between distance as imaging lens 5 optic back focal value and export.
In above-described embodiment, " the adjustable working condition " of so-called detection means refers to actually above-mentioned 1) -4) it is pointed
Working condition be that of the detection means can be adjusted the unit state for reaching, it is also possible in illustrating detection means
Each part can be regulation and fix, to meet the different demands in detection process.
In above-described embodiment, can be using the survey tool (not shown) outside the detection means to above-mentioned thermal imaging
The distance between the eyeglass of bottom and total reflection lens 6 are measured in camera lens 5, for example, be traditionally used for setting for measurement distance
Standby (gage etc.).
In preferred embodiment of the invention, above-mentioned first adjustment frame is four-dimensional adjustable adjustment frame, specifically, above-mentioned the
One adjustment frame is that pitching up and down deflects four-dimensional adjustable adjustment frame.
In preferred embodiment of the invention, above-mentioned second adjustment frame is three-dimensional adjustable adjustment frame, specifically, above-mentioned the
Two adjustment frames are the adjustable adjustment frame of front and rear three-dimensional precise up and down.
In preferred embodiment of the invention, spectroscope 4 towards imaging lens 5 one side be reflecting surface, spectroscope court
It is transparent area to the one side of collimator and extender mirror 3.In other words, above-mentioned spectroscope 4 is half-reflection and half-transmission spectroscope.
Further, in preferred embodiment of the invention, above-mentioned spectroscope 4 is saturating near one end of collimator and extender mirror 3
Bright face is high transmittance film layer, and the reflecting surface near one end of imaging lens 5 is 50% reflective coating for penetrating 50% reflection.
In preferred embodiment of the invention, above-mentioned total reflection lens 6 are the aluminium plane mirror of reflectivity 99%.
In preferred embodiment of the invention, above-mentioned Infrared Detectors 8 is to stare focus planardetector.
Further, in preferred embodiment of the invention, Infrared Detectors is the non-system being operated under 8-12 mum wavelengths
Cold detector, i.e. long wave uncooled detector.
Then in preferred embodiment of the invention, based on it is above-mentioned it is in running order under detection means, to thermal imaging mirror
First 5 carry out the detailed process of optic back focal detection as described hereinafter：
The infrared light of the transmitting of infrared light supply 1 sequentially passes through target 2,3 one-tenth directional lights of collimator and extender mirror, and directional light passes through light splitting
Mirror 4, and focused on total reflection lens 6 by imaging lens 5.Reflection of the light by total reflection lens 6 is focused on, then is passed through
Cross expanding for imaging lens 5 and become directional light.Directional light is by 45 degree of parts of spectroscope 4 of placement by 90 degree of reflections of deviation
To standard lens 7 and Infrared Detectors 8, to form the image of clearly target 2.Finally survey tool using outside (for example
Gage etc.) measurement imaging lens 5 last a piece of eyeglass to the distance between total reflection lens 6 as imaging lens 5
Optic back focal value.
In preferred embodiment of the invention, based on the above detection means, a kind of imaging lens are now provided
The detection method of optic back focal, the detection method it is specific as shown in Fig. 2 including：
Step S1, will include that the imaging lens of the eyeglass that multi-disc is from top to bottom laminated are arranged on spectroscope and completely reflecting mirror
Between head；
Step S2, by the position adjustment of infrared light supply, target, collimator and extender mirror, imaging lens and total reflection lens extremely
Center is with high and coaxial；
Step S3, spectroscope is adjusted to systematic optical axis in angle of 45 degrees, and spectroscope with systematic optical axis with high；
Step S4, standard lens and Infrared Detectors are adjusted to the back focal plane for making Infrared Detectors be located at standard lens
Position；
Step S5, by standard lens and Infrared Detectors adjust to respectively with spectroscope with it is high and respectively with systematic optical axis into
90 degree of angles；
Step S6, the distance between adjustment imaging lens and total reflection lens, so that Infrared Detectors is to target Cheng Qing
Clear picture；
Step S7, measurement obtain the distance between eyeglass of bottom in imaging lens and total reflection lens as heat into
As camera lens optic back focal value and export.
In above-described embodiment, the other structures of above-mentioned detection device and setting are no longer gone to live in the household of one's in-laws on getting married herein with reference to the above
State.
Preferred embodiments of the present invention are the foregoing is only, embodiments of the present invention and protection model is not thereby limited
Enclose, to those skilled in the art, should can appreciate that done by all utilization description of the invention and diagramatic content
Scheme obtained by equivalent and obvious change, should be included in protection scope of the present invention.
Claims (9)
1. a kind of detection means of imaging lens optic back focal, it is characterised in that the infrared light supply including sequential, mark
Target, collimator and extender mirror, spectroscope, total reflection lens, standard lens, Infrared Detectors and control device；
The collimator and extender mirror is arranged in one first adjustment frame, and the standard lens is connected with the Infrared Detectors, described
Infrared Detectors is arranged in one second adjustment frame, and the control device is connected with the Infrared Detectors；
The control device is used to control the Infrared Detectors, and infrared described in display screen display in the control device
The image of detector；
The detection means has an adjustable working condition, under the working condition：
To include that the imaging lens of the eyeglass that multi-disc is from top to bottom laminated are arranged on the spectroscope with the total reflection
Between camera lens；
The center of the infrared light supply, the target, the collimator and extender mirror, the imaging lens and the total reflection lens
With high and coaxial；
In angle of 45 degrees, and spectroscopical center and the systematic optical axis are with high for the spectroscope and systematic optical axis；
The Infrared Detectors is located at the position of the back focal plane of the standard lens, and the standard lens, the infrared spy
Device and spectroscopical center are surveyed with high, the standard lens and the Infrared Detectors respectively with the systematic optical axis into 90
Degree angle；
The distance between the imaging lens and described total reflection lens are adjusted, so that the Infrared Detectors is to the target
Into sharply defined image；
Measurement obtains the distance between the eyeglass of bottom in the imaging lens and described total reflection lens as institute
State the optic back focal value of imaging lens and export.
2. detection means as claimed in claim 1, it is characterised in that characterized in that, first adjustment frame can for the four-dimension
The adjustment frame of tune.
3. detection means as claimed in claim 1, it is characterised in that second adjustment frame is three-dimensional adjustable adjustment frame.
4. detection means as claimed in claim 1, it is characterised in that one side of the spectroscope towards the imaging lens
Be reflecting surface, the spectroscope towards the collimator and extender mirror one side be transparent area.
5. detection means as claimed in claim 4, it is characterised in that spectroscopical reflecting surface is penetrated for 50%
The reflective coating of 50% reflection.
6. detection means as claimed in claim 1, it is characterised in that the total reflection lens are aluminium plane mirror.
7. detection means as claimed in claim 1, it is characterised in that the Infrared Detectors is to stare focus planardetector.
8. detection means as claimed in claim 7, it is characterised in that the Infrared Detectors is to be operated under 8-12 mum wavelengths
Long wave uncooled detector.
9. a kind of detection method of imaging lens optic back focal a, it is characterised in that detection means, the detection means are provided
Infrared light supply, target, collimator and extender mirror including sequential, spectroscope, total reflection lens, standard lens, Infrared Detectors
And control device；
The collimator and extender mirror is arranged in one first adjustment frame, and the standard lens is connected with the Infrared Detectors, described
Infrared Detectors is arranged in one second adjustment frame, and the control device is connected with the Infrared Detectors；
The control device is used to control the Infrared Detectors, and infrared described in display screen display in the control device
The image of detector；
The detection method includes：
Step S1, will include the imaging lens of eyeglass that multi-disc from top to bottom be laminated be arranged on the spectroscope with it is described
Between total reflection lens；
Step S2, by the infrared light supply, the target, the collimator and extender mirror, the imaging lens and the total reflection
The position adjustment of camera lens is to center with high and coaxial；
Step S3, the spectroscope is adjusted to systematic optical axis in angle of 45 degrees, and the spectroscope and the system light
Axle is with high；
Step S4, by the standard lens and the Infrared Detectors adjust to make the Infrared Detectors be located at the standard mirror
The position of the back focal plane of head；
Step S5, by the standard lens and the Infrared Detectors adjust to respectively with the spectroscope with it is high and respectively with institute
State systematic optical axis into 90 degree of angles；
Step S6, adjusts the distance between the imaging lens and described total reflection lens, so that the Infrared Detectors pair
Target is into sharply defined image；
Step S7, measurement obtains the distance between the eyeglass of bottom in the imaging lens and described total reflection lens
As the imaging lens optic back focal value and export.
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| CN201710011223.1A CN106840408A (en) | 2017-01-06 | 2017-01-06 | A kind of detection means and detection method of imaging lens optic back focal |
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| CN201710011223.1A CN106840408A (en) | 2017-01-06 | 2017-01-06 | A kind of detection means and detection method of imaging lens optic back focal |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102564731A (en) * | 2010-12-16 | 2012-07-11 | 中国科学院西安光学精密机械研究所 | Device for measuring focal length and wavefront distortion of 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 |
| CN102589852A (en) * | 2012-01-16 | 2012-07-18 | 北京理工大学 | Autocollimating type confocal method for measuring focal length of lens |
| CN204314057U (en) * | 2014-12-19 | 2015-05-06 | 茂莱（南京）仪器有限公司 | A kind of focal length measuring equipment for Diode laser camera lens |
| CN105181298A (en) * | 2015-05-13 | 2015-12-23 | 北京理工大学 | Multiple reflection type laser con-focal long focal length measuring method and device |
-
2017
- 2017-01-06 CN CN201710011223.1A patent/CN106840408A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102564731A (en) * | 2010-12-16 | 2012-07-11 | 中国科学院西安光学精密机械研究所 | Device for measuring focal length and wavefront distortion of 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 |
| CN102589852A (en) * | 2012-01-16 | 2012-07-18 | 北京理工大学 | Autocollimating type confocal method for measuring focal length of lens |
| CN204314057U (en) * | 2014-12-19 | 2015-05-06 | 茂莱（南京）仪器有限公司 | A kind of focal length measuring equipment for Diode laser camera lens |
| CN105181298A (en) * | 2015-05-13 | 2015-12-23 | 北京理工大学 | Multiple reflection type laser con-focal long focal length measuring method and device |
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Application publication date: 20170613 |
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