CN109407365A - The measuring device and method of liquid crystal grating device diffraction efficiency under laser action - Google Patents
The measuring device and method of liquid crystal grating device diffraction efficiency under laser action Download PDFInfo
- Publication number
- CN109407365A CN109407365A CN201811523904.7A CN201811523904A CN109407365A CN 109407365 A CN109407365 A CN 109407365A CN 201811523904 A CN201811523904 A CN 201811523904A CN 109407365 A CN109407365 A CN 109407365A
- Authority
- CN
- China
- Prior art keywords
- laser
- liquid crystal
- crystal grating
- grating device
- analysis instrument
- 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.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/1306—Details
- G02F1/1309—Repairing; Testing
Landscapes
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
- Testing Of Optical Devices Or Fibers (AREA)
Abstract
The measuring device and method of liquid crystal grating device diffraction efficiency under a kind of laser action, including pump laser source, continuous probe laser source, beam splitter, beam quality analysis instrument, absorption cell and computer.When pump laser source irradiates liquid crystal grating device, continuous probe laser source also irradiates on device simultaneously, it records the spatial distribution through the continuous probe laser power density before and after liquid crystal grating device respectively by beam quality analysis instrument, and obtained power density is integrated in spatial distribution.Defining integrated value of the laser power density in spatial distribution is laser general power, is diffraction efficiency through the ratio between the exploring laser light beam general power before and after liquid crystal grating device.The present invention can accurately measure the diffraction efficiency variation of liquid crystal grating device under laser action, be liquid crystal grating device under continuous laser system using providing foundation.This method most importantly will carry out image pixel intensities extraction to the laser power density distribution map obtained by beam quality analysis instrument, using the size of image pixel intensities characterization laser power density, laser general power is by obtaining integral of the laser power density in spatial distribution.
Description
Technical field
The present invention relates to the testing fields of liquid crystal grating device performance under laser action, and in particular to liquid crystal under laser irradiation
The measuring device and method of the diffraction efficiency of grating device.
Background technique
Liquid crystal grating device is the new device for realizing beam deflection techniques, because having non-mechanical scanning, spatial discrimination
The advantages that rate is high, photoelectricity integration and programmability low in energy consumption and excellent and have weight in the fields such as laser radar and photoelectronic warfare
The application prospect wanted.Diffraction efficiency is one of the important parameter of liquid crystal grating device, studies the device parameter in high power laser light
Variation under effect is to evaluate one of the index of the anti-high power laser light damage performance of liquid crystal grating device.It is right in current research
Liquid crystal grating device is also not directed to the measurement of its diffraction efficiency under the conditions of high power pump Laser shock loading, is swashed to without pumping
The measurement of liquid crystal grating device diffraction efficiency under light loading environment；On the other hand, the measurement of liquid crystal grating device diffraction efficiency is also
Major part is to ask diffraction to imitate based on the technical solution of the signals such as photodetector detection zero-order diffraction light and the intensity of incident light
Rate.It should be pointed out that the heat absorption of the transparency conducting layer and liquid crystal layer of liquid crystal grating device is stronger, so that weaker test light
Variation of the photosignal of test in spatial distribution can also be caused by liquid crystal grating device.
Summary of the invention
The object of the present invention is to provide a kind of simple accurately methods to measure spreading out for liquid crystal grating device under laser action
Efficiency is penetrated, application of the liquid crystal grating device in high power continuous laser system is effectively instructed.
Technical solution of the invention is as follows:
The measuring device of liquid crystal grating device diffraction efficiency under a kind of laser action, comprising: continuous probe laser, beam splitting
Mirror, sample stage, pump laser, absorption cell and the computer placed for sample, which is characterized in that further include the first light beam matter
Measure analyzer and the second beam quality analysis instrument；The input terminal of the computer respectively with the first beam quality analysis instrument
The output end of output end and the second beam quality analysis instrument is connected, and liquid crystal grating device to be measured is clamped on the sample stage；
The laser of the continuous probe laser output is divided into the reflected beams and transmitted light beam, institute after the beam splitter
The reflected beams stated are received by the first beam quality analysis instrument, and the transmitted light beam is vertically irradiated in the liquid crystal to be measured
Grating device surface is received after the liquid crystal grating device transmission to be measured by the second beam quality analysis instrument；Described
Beam quality analysis instrument can measure the spatial distribution of laser power；
The laser of the pump laser output is irradiated with 5-10 ° of incidence angle in the liquid crystal grating device to be measured
On, the laser beam after the liquid crystal grating device to be measured penetrates is received by the absorption cell；
Region and institute of the laser irradiation of the continuous probe laser output on the liquid crystal grating device to be measured surface
State area coincidence of the laser irradiation on the liquid crystal grating device to be measured surface of pump laser output.
The measurement method of liquid crystal grating device diffraction efficiency under a kind of laser action, which is characterized in that specifically comprising following
Step:
1. pump laser and continuous probe laser while irradiation sample, the first beam quality analysis instrument and second
The spatial distribution map of the synchronous continuous acquisition exploring laser light of beam quality analysis instrument；
2. carrying out pixel in the spatial distribution map that t moment measures beam power density to the first beam quality analysis instrument
Intensity is extracted, and is obtained the first beam quality analysis instrument described in t moment and is measured the power density size E (x, y) in the position (x, y),
It is calculated with this by the received general power P of the first beam quality analysis instrument1, formula is as follows:
3. carrying out pixel in the spatial distribution map that t moment measures beam power density to the second beam quality analysis instrument
Intensity is extracted, and is obtained the second laser beam analyzer described in t moment and is measured the power density size E (x, y) in the position (x, y), with this
It calculates by the received general power P of the second beam quality analysis instrument2, formula is as follows:
4. calculating liquid crystal grating device to be measured in the diffraction efficiency of pumping laser irradiation t moment, formula is as follows:
The measurement method of liquid crystal grating device diffraction efficiency under the laser action, which is characterized in that with described first
Product of the exploring laser light power density that beam quality analysis instrument and the second beam quality analysis instrument measure in spatial distribution
Score value is incident on liquid crystal grating device and the true laser total work after liquid crystal grating device diffraction to obtain exploring laser light
Rate.
The present invention has following advantageous effects compared with prior art:
1. the present invention proposes the diffraction efficiency measurement method of liquid crystal grating device under laser action, exist for liquid crystal grating device
Application in practical high power laser system provides reasonable evaluation means.
2. the present invention integrates the distribution of the laser light rate density obtained by beam quality analysis instrument spatially, can be with
Simply and effectively realize the accurate measurement of liquid crystal grating device diffraction efficiency.
Detailed description of the invention
Fig. 1 is the schematic device of liquid crystal grating device diffraction efficiency under present invention measurement laser action
In figure: 1- continuous probe laser, 2- beam splitter, 3- the first beam quality analysis instrument, 5- sample stage, the second light of 6-
Beam quality analyzer, 7- pump laser, 8- absorption cell, 9- computer.
Specific embodiment
Embodiments of the present invention are described further below with reference to embodiment and attached drawing, but this hair should not be limited with this
Bright protection scope.
As shown in Figure 1, under a kind of laser action liquid crystal grating device diffraction efficiency measuring device, comprising: continuous probe
Laser 1, beam splitter 2, sample stage 5, pump laser 7, absorption cell 8 and the computer 9 placed for sample, further include first
Beam quality analysis instrument 3 and the second beam quality analysis instrument 6, the input terminal of the computer 9 respectively with the first light beam matter
The output end of the output end and the second beam quality analysis instrument 6 of measuring analyzer 3 is connected, and liquid crystal grating device 4 to be measured is clamped in institute
It states on sample stage 5；
The laser that the continuous probe laser 1 exports is divided into the reflected beams and transmitted light beam after the beam splitter 2,
The reflected beams are received by the first beam quality analysis instrument 3, and the transmitted light beam is vertically irradiated described to be measured
4 surface of liquid crystal grating device is connect after the liquid crystal grating device 4 to be measured transmits by the second beam quality analysis instrument 6
It receives；
The laser that the pump laser 7 exports is irradiated with 5-10 ° of incidence angle in the liquid crystal grating device 4 to be measured
On, the laser beam after the liquid crystal grating device 4 to be measured penetrates is received by the absorption cell 8；
The laser irradiation that the continuous probe laser 1 exports 4 surface of liquid crystal grating device to be measured region with
Area coincidence of the laser irradiation that the pump laser 7 exports on 4 surface of liquid crystal grating device to be measured.
Pump laser 7 uses homemade 1064nm jointed fiber laser, the laser beam spot of outgoing in the present embodiment
Diameter is 2mm, peak power 100W.
Continuous probe laser 1 is homemade optical fiber laser, and the laser beam spot diameter of outgoing is 1mm, peak power
For 50mW；
Beam splitter 2 is homemade 1064nm semi-transparent semi-reflecting lens；
First beam quality analysis instrument 3 and the second beam quality analysis instrument 6 are the camera-type light beam point of Coherent company
Analyzer-BeamView can detect the respective wavelength of 190-1700nm, the spot diameter of 0.2-6mm；
Absorption cell 8 is homemade absorption cell, can bear the CW Laser of 200W.
The measurement method of liquid crystal grating device diffraction efficiency under a kind of laser action, comprising the following steps:
1. the laser power that continuous pump laser output is arranged is P'；
2. the first beam quality analysis instrument 3 continuous acquisition exploring laser light synchronous with the second beam quality analysis instrument 6
Spatial distribution map；
3. carrying out picture in the spatial distribution map that t moment measures beam power density to the first beam quality analysis instrument 3
Plain intensity is extracted, obtain the first beam quality analysis instrument 3 described in t moment measure the position (x, y) power density size E (x,
Y), it is calculated with this by the received general power P of the first beam quality analysis instrument 31, formula is as follows:
4. carrying out picture in the spatial distribution map that t moment measures beam power density to the second beam quality analysis instrument 6
Plain intensity is extracted, and is obtained the second laser beam analyzer 6 described in t moment and is measured the power density size E (x, y) in the position (x, y), with
This is calculated by the received general power P of the second beam quality analysis instrument 62, formula is as follows:
5. calculating liquid crystal grating device 4 to be measured in the diffraction efficiency of pumping laser irradiation t moment, formula is as follows:
The measurement method of liquid crystal grating device diffraction efficiency under the laser action, which is characterized in that with described first
Integrated value of the laser intensity that beam quality analysis instrument 3 and the second beam quality analysis instrument 6 measure in spatial distribution is come
Determine the diffraction efficiency of the liquid crystal grating device 4.
Claims (3)
1. the measuring device of liquid crystal grating device diffraction efficiency under a kind of laser action, comprising: continuous probe laser (1) divides
Shu Jing (2), sample stage (5), pump laser (7), absorption cell (8) and the computer (9) placed for sample, feature exists
In, it further include the first beam quality analysis instrument (3) and the second beam quality analysis instrument (6), the input terminal point of the computer (9)
It is not connected with the output end of the output end of the first beam quality analysis instrument (3) and the second beam quality analysis instrument (6), it is to be measured
Liquid crystal grating device (4) is clamped on the sample stage (5)；
The laser of continuous probe laser (1) output is divided into the reflected beams and transmitted light beam after the beam splitter (2),
The reflected beams are received by the first beam quality analysis instrument (3), the transmitted light beam vertically irradiate it is described to
Liquid crystal grating device (4) surface is surveyed, after liquid crystal grating device (4) transmission to be measured, by second beam quality analysis
Instrument (6) receives；
The laser of pump laser (7) output is irradiated with 5-10 ° of incidence angle in the liquid crystal grating device (4) to be measured
On, the laser beam after the liquid crystal grating device (4) to be measured penetrates is received by the absorption cell (8)；
The laser irradiation of the continuous probe laser (1) output liquid crystal grating device (4) surface to be measured region with
Area coincidence of the laser irradiation of pump laser (7) output on liquid crystal grating device (4) surface to be measured.
2. the measurement method of liquid crystal grating device diffraction efficiency under a kind of laser action measures light to the beam quality analysis instrument
The space diagram of beam power density carries out image pixel intensities extraction, and definition image pixel intensities are laser power density, which is characterized in that specific
It comprises the steps of:
1. pump laser and continuous probe laser while irradiation sample, the first beam quality analysis instrument (3) and the second light beam matter
Measure the spatial distribution map of analyzer (6) synchronous continuous acquisition exploring laser light；
2. carrying out pixel in the spatial distribution map that t moment measures beam power density to the first beam quality analysis instrument (3)
Intensity is extracted, and is obtained the first beam quality analysis instrument (3) described in t moment and is measured the power density E (x, y) in the position (x, y), counts
It calculates by the received general power P of the first beam quality analysis instrument (3)1, formula is as follows:
3. carrying out pixel in the spatial distribution map that t moment measures beam power density to the second beam quality analysis instrument (6)
Intensity is extracted, and is obtained the second laser beam analyzer (6) described in t moment and is measured the power density E (x, y) in the position (x, y), calculate by
The received general power P of second beam quality analysis instrument (6)2, formula is as follows:
4. calculating liquid crystal grating device (4) to be measured in the diffraction efficiency of pumping laser irradiation t moment, formula is as follows:
3. the measurement method of liquid crystal grating device diffraction efficiency under laser action according to claim 2, which is characterized in that
The exploring laser light power measured by the first beam quality analysis instrument (3) and the second beam quality analysis instrument (6) is close
The integrated value spent in spatial distribution is incident on liquid crystal grating device and through liquid crystal grating device diffraction to obtain exploring laser light
True laser general power afterwards.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811523904.7A CN109407365B (en) | 2018-12-13 | 2018-12-13 | Device and method for measuring diffraction efficiency of liquid crystal grating device under laser action |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811523904.7A CN109407365B (en) | 2018-12-13 | 2018-12-13 | Device and method for measuring diffraction efficiency of liquid crystal grating device under laser action |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109407365A true CN109407365A (en) | 2019-03-01 |
| CN109407365B CN109407365B (en) | 2021-07-06 |
Family
ID=65459031
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811523904.7A Active CN109407365B (en) | 2018-12-13 | 2018-12-13 | Device and method for measuring diffraction efficiency of liquid crystal grating device under laser action |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109407365B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111289225A (en) * | 2020-02-26 | 2020-06-16 | 中国科学院上海光学精密机械研究所 | Device and method for measuring phase characteristics of liquid crystal wave plate under continuous laser loading |
| CN113567092A (en) * | 2021-09-24 | 2021-10-29 | 上海钜成锐讯科技有限公司 | Device and method for measuring diffraction efficiency of liquid crystal grating |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4060316A (en) * | 1975-02-25 | 1977-11-29 | Xerox Corporation | Imaging method |
| CN1209892A (en) * | 1995-12-18 | 1999-03-03 | 计量器具公司 | Holographic laser scanning system, and process and apparatus and methods for designing and constructing same |
| WO2006041990A2 (en) * | 2004-10-04 | 2006-04-20 | Board Of Regents, The University Of Texas System | Switchable holographic gratings |
| JP2008098496A (en) * | 2006-10-13 | 2008-04-24 | Sumitomo Heavy Ind Ltd | Chirp pulse amplifier, and amplification method |
| US20100123902A1 (en) * | 2008-11-14 | 2010-05-20 | Chen Cheng-Fu | Method for Determining the Dynamic Range of Volume Holographic Memories |
| CN102539122A (en) * | 2012-01-04 | 2012-07-04 | 西北工业大学 | Method and system for measuring diffraction efficiency of grating by using parabolic reflector |
| CN102564741A (en) * | 2012-01-04 | 2012-07-11 | 西北工业大学 | Method and system for measuring grating diffraction efficiency by using ellipsoidal reflecting mirror |
| CN103226058A (en) * | 2013-04-02 | 2013-07-31 | 中国科学院长春光学精密机械与物理研究所 | Method for measuring grating diffraction efficiency based on compensation algorithm |
| CN105928688A (en) * | 2016-04-19 | 2016-09-07 | 中国科学院上海光学精密机械研究所 | Measurement device and method of grating diffraction efficiency spectrum based on single time exposure mode |
| CN207515999U (en) * | 2017-11-27 | 2018-06-19 | 苏州大学 | The device that a kind of large-area metal dielectric gratings diffraction efficiency measures |
| CN108332945A (en) * | 2017-12-26 | 2018-07-27 | 湖北航天技术研究院总体设计所 | A kind of diffraction efficiency of grating test system and method |
| JP2018139300A (en) * | 2018-04-09 | 2018-09-06 | キヤノン株式会社 | Laser device, and spectroscopic method |
-
2018
- 2018-12-13 CN CN201811523904.7A patent/CN109407365B/en active Active
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4060316A (en) * | 1975-02-25 | 1977-11-29 | Xerox Corporation | Imaging method |
| CN1209892A (en) * | 1995-12-18 | 1999-03-03 | 计量器具公司 | Holographic laser scanning system, and process and apparatus and methods for designing and constructing same |
| WO2006041990A2 (en) * | 2004-10-04 | 2006-04-20 | Board Of Regents, The University Of Texas System | Switchable holographic gratings |
| JP2008098496A (en) * | 2006-10-13 | 2008-04-24 | Sumitomo Heavy Ind Ltd | Chirp pulse amplifier, and amplification method |
| US20100123902A1 (en) * | 2008-11-14 | 2010-05-20 | Chen Cheng-Fu | Method for Determining the Dynamic Range of Volume Holographic Memories |
| CN102539122A (en) * | 2012-01-04 | 2012-07-04 | 西北工业大学 | Method and system for measuring diffraction efficiency of grating by using parabolic reflector |
| CN102564741A (en) * | 2012-01-04 | 2012-07-11 | 西北工业大学 | Method and system for measuring grating diffraction efficiency by using ellipsoidal reflecting mirror |
| CN103226058A (en) * | 2013-04-02 | 2013-07-31 | 中国科学院长春光学精密机械与物理研究所 | Method for measuring grating diffraction efficiency based on compensation algorithm |
| CN105928688A (en) * | 2016-04-19 | 2016-09-07 | 中国科学院上海光学精密机械研究所 | Measurement device and method of grating diffraction efficiency spectrum based on single time exposure mode |
| CN207515999U (en) * | 2017-11-27 | 2018-06-19 | 苏州大学 | The device that a kind of large-area metal dielectric gratings diffraction efficiency measures |
| CN108332945A (en) * | 2017-12-26 | 2018-07-27 | 湖北航天技术研究院总体设计所 | A kind of diffraction efficiency of grating test system and method |
| JP2018139300A (en) * | 2018-04-09 | 2018-09-06 | キヤノン株式会社 | Laser device, and spectroscopic method |
Non-Patent Citations (8)
| Title |
|---|
| SHIMIZU,A: "Simple measuring technique for the diffraction efficiency of slanted volume gratings at various wavelengths", 《APPLIED OPTICS》 * |
| 公维超等: "多层电介质衍射光栅高功率激光辐照特性研究", 《中国激光》 * |
| 公维超等: "高功率激光照射下多层电介质光栅的热光效应研究", 《2016年红外、遥感技术与应用研讨会暨交叉学科论坛论文集》 * |
| 朱晓亮著: "《微结构光纤耦合理论及技术》", 31 October 2016, 沈阳：东北大学出版社 * |
| 李俊昌: "《激光热处理优化控制研究》", 30 December 1995, 冶金工业出版社 * |
| 王丽主编: "《光电子与光通信实验》", 28 February 2008, 北京：北京工业大学出版社 * |
| 王伟: "超短脉冲激光照射下光栅Talbot效应的实验研究", 《光子学报》 * |
| 王驰: "《激光检测技术及应用》", 31 December 2016, 上海大学出版社 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111289225A (en) * | 2020-02-26 | 2020-06-16 | 中国科学院上海光学精密机械研究所 | Device and method for measuring phase characteristics of liquid crystal wave plate under continuous laser loading |
| CN113567092A (en) * | 2021-09-24 | 2021-10-29 | 上海钜成锐讯科技有限公司 | Device and method for measuring diffraction efficiency of liquid crystal grating |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109407365B (en) | 2021-07-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103091255B (en) | Terahertz time-space resolution imaging system, formation method and application thereof | |
| CN103175808B (en) | Laser-induced breakdown spectroscopy analysis system and method | |
| KR101545419B1 (en) | Device for detecting foreign matter and method for detecting foreign matter | |
| CN101526477B (en) | Laser differential confocal spectrum microscopy tomography device | |
| CN102384836B (en) | Laser multi-parameter real-time measuring device | |
| CN201993440U (en) | Laser characteristic test device | |
| CN105548099B (en) | The lossless three-dimensional imaging of historical relic based on two-photon fluorescence excitation and Components identification method | |
| CN106645033B (en) | The ultrafast diagnostic device of optical element laser damage integration | |
| CN103033488B (en) | Z scanning optical nonlinear measurement device and method capable of observing and monitoring in real time | |
| CN105021627B (en) | The highly sensitive quick on-line water flushing method of optical thin film and element surface damage from laser | |
| CN106093011B (en) | Coal quality detecting method and its coal quality laser detection analysis instrument of application | |
| CN109406453B (en) | Z scanning measurement method for automatically determining optimal incident light intensity | |
| WO2017070997A1 (en) | High-speed three-dimensional microscopic imaging system and method | |
| CN103175629B (en) | Method for fast measuring sea water temperature | |
| CN207515999U (en) | The device that a kind of large-area metal dielectric gratings diffraction efficiency measures | |
| CN102243098B (en) | In-situ test system of strong laser beam quality | |
| CN108120702A (en) | A kind of super resolution fluorescence lifetime imaging method and device based on parallel detecting | |
| CN203745385U (en) | Laser ultrasonic optical interference detection device | |
| CN209086170U (en) | A kind of high reflection mirror beauty defects parameter characterization device | |
| CN104635129B (en) | A kind of liquid dielectric space electric field rapid measurement device and method | |
| CN109444191A (en) | A kind of high pressure sample test method of pulsed laser heating | |
| CN109407365A (en) | The measuring device and method of liquid crystal grating device diffraction efficiency under laser action | |
| CN105258802A (en) | Unstable environment transient-state temperature measuring device based on coarse and fine two-stage light splitting structure | |
| CN106680186B (en) | A kind of flow cytometer polymorphic type scattering optical detection system | |
| Shao et al. | Feasibility study of wood-leaf separation based on hyperspectral LiDAR Technology in indoor circumstances |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |