LIDAR Light Detection and Ranging Kate Whalen PHY 3903 Nov. 25, 2005.

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Presentation transcript:

LIDAR Light Detection and Ranging Kate Whalen PHY 3903 Nov. 25, 2005

Outline Some applications How lidar works Examples of current lidar projects –Purple Crow Lidar –Dalhousie Raman Lidar

Applications Distance measurements Atmospheric composition Weather Mapping Speed measurements

Lidar Basics Active remote sensing Light is emitted, scattered, and detected. Since we know the speed of light, we can measure the distance travelled!

Details 3 main parts Transmitter –Example: Pulsed Nd:YAG laser (532 nm) Low beam divergence Narrow spectral width Receiver –Optical telescope Detector –PMT –Chopper Eliminates near-field returns

Purple Crow Lidar (UWO) Detector consists of a 2.65 m mercury mirror, rotating at 10 rpm –Parabolic mirror 532 nm Nd:YAG laser used for Rayleigh scattering –Elastic scattering at km Obtain T(z) from density profile –Assumptions Hydrostatic equilibrium Ideal gas

PCL Projects

Dalhousie Raman Lidar CABOT Observatory –Canadian Atmosphere- Biosphere Observations Trailer 607 nm Nd:YAG laser Raman scattering –Inelastic scattering (change in rotational or vibrational energy) –Frequency of scattered photon depends on temperature, type of molecule Investigates atmospheric aerosols & clouds –Transboundary pollution transport

CABOT Projects

In Conclusion… Lidar is an example of physics for the benefit of the planet!

References Thanks to Dr. Bob Sica and the PCL group at UWO! Argall, P. S. & R. J. Sica, Lidar (Laser Radar). In The Encyclopedia of Optics, Vol. 2, Ed. T. G. Brown et al., Wiley-VCH, Weinheim, Duck, T. J. et al., Lidar measurements of atmospheres. Physics in Canada 61 (5) , Sica, R. J. et al., Lidar measurements taken with a large-aperture liquid mirror. 1. Rayleigh-scatter system. Applied Optics 34 (30) , Environment Canada: Air Quality Processes Research Division [Online]. [Nov. 24, 2005]. Purple Crow Lidar [Online]. [Nov. 24, 2005]. REALM: Regional East Atmospheric Lidar Mesonet [Online]. [Nov. 24, 2005]. The Atmospheric Optics Laboratory [Online]. [Nov. 24, 2005].