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Laser Range Finder

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Laser Range Finder Mech 207 Advanced Mechatronics I TJ Leising October 23, 2009 Introduction Laser light basics Propagates dominantly in one direction in the form ... – PowerPoint PPT presentation

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Title: Laser Range Finder


1
Laser Range Finder
  • Mech 207 Advanced Mechatronics I
  • TJ Leising
  • October 23, 2009

2
Introduction
  • Laser light basics
  • Propagates dominantly in one direction in the
    form of a beam
  • Beam can maintain integrity for very long
    distances
  • Lasers are ideal to measure distances
  • Different methods used to measure different
    lengths
  • i.e. Triangulation and Time of Flight

All photos courtesy Acuity
3
Introduction (cont.)
  • Time of Flight
  • Measures the time the laser take to travel the
    distance and back
  • Short pulse fired out and time measured for a
    reflected portion to come back
  • Longer time farther away
  • temporal accuracy must be very high e.g. 1?ns
    for a spatial accuracy of 15?cm
  • Triangulation
  • Have sensors offset to measure angle of
    reflectance
  • Based on geometry, distance can be determined

Courtesy Physorg.com
Courtesy Sensorland.com
4
Laser Physics
  • Laser Light is
  • Monochromatic
  • it contains one specific wavelength of photons
  • Coherent
  • All the photons have wave fronts that are in
    unison
  • Directional
  • Propagates generally in one direction in a
    concentrated beam

Atoms are excited and release photons that travel
down the tube reflecting off mirrors and exciting
more atoms until they leave the tube through a
lens in a concentrated laser beam.
5
Implementation
  • Laser is installed to additional sensing
    circuitry
  • A photo sensor receives the reflected signal
  • Triggers timer stopping circuitry or angle
    valve input
  • Data from the time of flight or the angle of
    impact is used to determine the distance to
    target

Courtesy philohome.com
6
Applications
  • Recreation
  • Golf and Hunting
  • Production Control
  • Keep a level surface
  • 3-D mapping
  • For robotics or scouting
  • High Precision Guidance
  • Missiles, Targeting Computers

Courtesy binocularsdirect.com
Courtesy seattlerobotics.org
Courtesy foxnews.com
7
Challenges
  • Issues with lasers
  • Tend to be expensive
  • Dependent on line-of-sight (wall vs. chair)
  • Can involve complicated circuitry that might not
    be necessary
  • Laser pointing fluctuations
  • Laser noise issues

Courtesy Encyclopedia of Laser Physics
8
References
  • Encyclopedia of Laser Physics and Technology
  • http//www.rp-photonics.com/
  • Acroname Robotics
  • http//www.acroname.com/
  • Acuity Laser Measurements
  • http//www.acuitylaser.com/products.shtml
  • Sensorland.com
  • http//www.sensorland.com/HowPage056.html
  • Encoder The Newsletter of the Seattle Robotics
    Society
  • http//www.seattlerobotics.org/encoder/200110/visi
    on.htm
  • How Stuff Works
  • http//www.howstuffworks.com/
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