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WELCOME
LIDAR
DEEPTHI
Submitted by,
CONTENTS
• Introduction
• Lidar - What???
Why???
How(operating principle)???
• General Description -
Lidar Vs Radar
Techno...
• History of Lidar
• Basic Architecture of Lidar
• Components
• Working of Lidar
• Applications
• Advantages
• Dis-advanta...
 What is LIDAR ?
• Light Detection And Ranging
• Remote sensing technology
• Similar to RADAR
• Uses shorter wavelength o...
 LASER
• Light Amplification by Stimulated Emission
of Radiation.
• Laser + Receiver System=LIDAR
• Monochromatic,Directi...
Regions of Electromagnetic Spectrum:
• Different Performance: on solid surface,water, on
vegetation
• pinpoint targeting
•...
LIDAR RADAR
Uses optical signals(Near
IR,visible).wavelengths~1um
Uses microwave
signals.Wavelengths~1cm(Approx 100,000
ti...
HISTORY OF LIDAR
• Christian Huelsmeyer’s, “Telemobiloscope”-1904
• LASER - theorized by Albert Einstein 1917,
designed by...
TECHNOLOGIES USED
• 3 Technologies in LIDAR:-
 Lasers – Laser sensor
 Global Positioning System(GPS) – sensor position
...
LIDAR TYPES
 Based on the physical process(range finders,DIAL,doppler lidar)
 Based on scattering process(Mie, Rayleigh,...
Terrestrial Airborne
What can we measure with LIDAR?
• Clouds
• Aerosol
• Water Vapour
• Minor constituents (eg:ozone,hydro carbons)
• Temperat...
BASIC ARCHITECTURE OF LIDAR
Transmitter Receiver
Data Acquisition $
Control System
 Function of Transmitter
• provide laser pulses
• consist of lasers,wavelength control system,diagnostic equipment
• dete...
Function of Data Acquisition & Control System
• record returned data and time-of-flight
• provide system control and coor...
COMPONENTS
• Terrestrial Lidar
• Laser-Nd:YAG Laser
• Optical Telescope
• Mirror Shutter
• Photo multiplier tubes
• Detect...
WORKING OF LIDAR
• Laser-generates an optical pulse
• Return pulse
• High speed counter
• Calculate Distance :-
* Distance=(Speed of Light ...
• LidarTransmitter, Scanner, and Receiver
• Aircraft Positioning –Differential GPS (with post-processing)
• Aircraft Attit...
APPLICATIONS
 AGRICULTURE
 ARCHAEOLOGY
 BIOLOGY & CONSERVATION
 HYDROLOGY
 MILITARY & LAW ENFORCEMENT
 PHYSICS & AST...
• Create a topological map of the fields
Agriculture
• Provide an overview of hidden sites
• Use airborne lidars
Archaeology
OLD maps LIDAR DEM
Biology & Conservation
• Used to retrieve forest canopy structural information
• Use airborne lidars
Hydrology
• Used for Under water investigation:flood risk mapping
• Use Bathymetric Lidar
Military & Law enforcement
Police officer using a hand-held LIDAR speed gun
• Lidar speed gun-measure speed of vehicles
• ...
Physics & astronomy
• Measure the distance to reflectors placed on the moon
• Used in Mars-Orbiting Satellite
• Used to de...
Meterology
• Used for studies of atmospherics conditions , clouds and aerosols.
• Used for measurement of atm. Gases
• Mea...
Robotics
• Allowing it to map the surrounding area and avoid obstacles.
• Use Mobile Lidar
LIDAR-equipped mobile robot
Geology
• Detect fault and measure uplift
• Monitors glaciers
• Use Terrestrial & airborne lidars
Terrestrial Lidar
SHOALS-SPECIFIC APPLICATIONS
• Undersea cable routing
• Wreck detection
• Charting and safety issues
ADVANTAGES
• Higher accuracy
• Minimum human dependence
• Weather or Light independence
• Canopy penetration
• Higher data...
DIS-ADVANTAGES
most lidar data are collected at night, but
unlike radar,lidar cannot penetrate clouds,
rain, or dense haze...
LIDAR
LIDAR
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LIDAR

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LIDAR

  1. 1. WELCOME
  2. 2. LIDAR DEEPTHI Submitted by,
  3. 3. CONTENTS • Introduction • Lidar - What??? Why??? How(operating principle)??? • General Description - Lidar Vs Radar Technologies used in Lidar Types of Lidar
  4. 4. • History of Lidar • Basic Architecture of Lidar • Components • Working of Lidar • Applications • Advantages • Dis-advantages • Future Scope • Conclusion
  5. 5.  What is LIDAR ? • Light Detection And Ranging • Remote sensing technology • Similar to RADAR • Uses shorter wavelength of EM-spectrum • Measures properties of scattered light • System based on a Laser Sensor INTRODUCTION
  6. 6.  LASER • Light Amplification by Stimulated Emission of Radiation. • Laser + Receiver System=LIDAR • Monochromatic,Directional,Coherent • Use of Lasers • Measure objects that are the same size or larger than its own wavelength. • The Scattering Process –Rayleigh,RAMAN,Fluorescence General Description
  7. 7. Regions of Electromagnetic Spectrum: • Different Performance: on solid surface,water, on vegetation • pinpoint targeting • Lidar operates in U.V,visible and infrared region • Wavelengths in a range from about 10 m.m to the UV
  8. 8. LIDAR RADAR Uses optical signals(Near IR,visible).wavelengths~1um Uses microwave signals.Wavelengths~1cm(Approx 100,000 times longer than Near IR) Shorter wavelengths allow detection of smaller objects(cloud particles,aerosols). Target size limited by longer wavelength Focussed beam and high frequency permit high spatial resolution.(<1m horizontal). Beam width and antenna length limit spatial resolution(10s of meters) Downward looking sensor Side looking sensor Limited to clear atmospheric conditions,daytime or nighttime coverage. Can operate in presence of clouds.Daytime or Nighttime coverage. LIDAR Vs RADAR
  9. 9. HISTORY OF LIDAR • Christian Huelsmeyer’s, “Telemobiloscope”-1904 • LASER - theorized by Albert Einstein 1917, designed by Gordon Gould in 1957, developed by American physicist,Theodore Maiman in 1960 • Global Positioning Systems (GPS) -1980 • First commercial airborne Lidar systems -1995
  10. 10. TECHNOLOGIES USED • 3 Technologies in LIDAR:-  Lasers – Laser sensor  Global Positioning System(GPS) – sensor position  Inertial Navigation System(INS) – exact sensor measurment
  11. 11. LIDAR TYPES  Based on the physical process(range finders,DIAL,doppler lidar)  Based on scattering process(Mie, Rayleigh, Raman, Fluorescence Lidar)  Based on the platform(Groundbased, Airborne, Spaceborne)
  12. 12. Terrestrial Airborne
  13. 13. What can we measure with LIDAR? • Clouds • Aerosol • Water Vapour • Minor constituents (eg:ozone,hydro carbons) • Temperature
  14. 14. BASIC ARCHITECTURE OF LIDAR Transmitter Receiver Data Acquisition $ Control System
  15. 15.  Function of Transmitter • provide laser pulses • consist of lasers,wavelength control system,diagnostic equipment • determines the performance of Lidar system  Function of Receiver • collect $ detect returned photon signals • consist of telescopes,filters,photon detectors,discriminators etc • distinguishes the returned photons
  16. 16. Function of Data Acquisition & Control System • record returned data and time-of-flight • provide system control and coordination • consists of multi-channel scalar,discriminator,computer and software • enabling various data acquisition modes
  17. 17. COMPONENTS • Terrestrial Lidar • Laser-Nd:YAG Laser • Optical Telescope • Mirror Shutter • Photo multiplier tubes • Detector- spectrometer
  18. 18. WORKING OF LIDAR
  19. 19. • Laser-generates an optical pulse • Return pulse • High speed counter • Calculate Distance :- * Distance=(Speed of Light * Time of flight) / 2 * Speed of light : 3 x 108 m/s dist=t2way / 2 * c
  20. 20. • LidarTransmitter, Scanner, and Receiver • Aircraft Positioning –Differential GPS (with post-processing) • Aircraft Attitude –Pitch, Roll, Yaw –Inertial Navigation System
  21. 21. APPLICATIONS  AGRICULTURE  ARCHAEOLOGY  BIOLOGY & CONSERVATION  HYDROLOGY  MILITARY & LAW ENFORCEMENT  PHYSICS & ASTRONOMY  METEROLOGY  GEOLOGY
  22. 22. • Create a topological map of the fields Agriculture
  23. 23. • Provide an overview of hidden sites • Use airborne lidars Archaeology OLD maps LIDAR DEM
  24. 24. Biology & Conservation • Used to retrieve forest canopy structural information • Use airborne lidars
  25. 25. Hydrology • Used for Under water investigation:flood risk mapping • Use Bathymetric Lidar
  26. 26. Military & Law enforcement Police officer using a hand-held LIDAR speed gun • Lidar speed gun-measure speed of vehicles • Identifying one vehicle from the traffic stream
  27. 27. Physics & astronomy • Measure the distance to reflectors placed on the moon • Used in Mars-Orbiting Satellite • Used to detect snow in Mars atmosphere • Used to measure molecular density • calculate temperature Astronomical Lidar
  28. 28. Meterology • Used for studies of atmospherics conditions , clouds and aerosols. • Used for measurement of atm. Gases • Measures wind speed • Use Mie scattering ,DIAL and space-based Doppler wind Lidar(DWL)
  29. 29. Robotics • Allowing it to map the surrounding area and avoid obstacles. • Use Mobile Lidar LIDAR-equipped mobile robot
  30. 30. Geology • Detect fault and measure uplift • Monitors glaciers • Use Terrestrial & airborne lidars Terrestrial Lidar
  31. 31. SHOALS-SPECIFIC APPLICATIONS • Undersea cable routing • Wreck detection • Charting and safety issues
  32. 32. ADVANTAGES • Higher accuracy • Minimum human dependence • Weather or Light independence • Canopy penetration • Higher data density
  33. 33. DIS-ADVANTAGES most lidar data are collected at night, but unlike radar,lidar cannot penetrate clouds, rain, or dense haze and must be flown during fair weather.

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