4 record(s) found for principle investigator "Lehn, W.H." (multi-year projects are grouped):
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Polar Atmospheric Refraction
Principal Investigator: Lehn, W.H.
Licenced Year(s): 1994
Summary: Mirages occur fairly frequently in the arctic. They distort image and landform shapes as well as our perception of distance. This study will examine the underlying causes of mirages by collecting data using time lapse and video photography. This data will be used to examine a theoretical model which attempts to explain the distortion properties of mirages....


Atmospheric Refraction Phenomena
Principal Investigator: Lehn, W.H.
Licenced Year(s): 1987
Summary: To study the optical refraction and image transmission in the lower layer of the atmosphere, in particular under conditions of temperature inversion. To improve the understanding of these processes, and to continue to search for remote sensing techniques that provide temperature profiles through optical measurements....


Licence #5020
Principal Investigator: Lehn, W.H.
Licenced Year(s): 1985
Summary: To further study meteorological optics by photographic recording of land forms and their refracted images over horizontal lines of sight; measurement of refraction and horizon shift by theodolite; local surveys of the photographed land forms and observation sites....


Licence #4015
Principal Investigator: Lehn, W.H.
Licenced Year(s): 1984
Summary: To investigate optical refraction in the lower layers of the atmosphere (anomalous refraction, such as the superior mirage and optical ducting). Photographic recording of land forms and their refracted images: measurement of refraction and horizon shift; some measurement of atmospheric temperatures in the lowest layers (10-15 meters); local surveys of the photographed land forms....


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