Optimum time of day and night for measuring distances in turbulent atmosphere with optical range finders (case of high rise of laser beam above ground surfaces)
Abstract
Accurate measurement of distances greater than 10 km, with optical (laser) range finders which presents a problem in geodetic research, are discussed. A modulated laser beam in a turbulent atmosphere was analyzed. Histograms of temperature errors are plotted for diurinal 24 h periods in Central Asia. It is indicated that deviations from a linear temperature profile are largest from 11 AM to 2 PM and smallest from 8 to 11 AM and from 5 to 8 PM.
- Publication:
-
USSR Rept Electron Elec Eng JPRS UEE
- Pub Date:
- May 1984
- Bibcode:
- 1984RpEEE.......40C
- Keywords:
-
- Distance Measuring Equipment;
- Electromagnetic Wave Transmission;
- Laser Beams;
- Laser Range Finders;
- Atmospheric Turbulence;
- Diurnal Variations;
- Electromagnetic Radiation;
- Geodetic Surveys;
- Optical Range Finders;
- Lasers and Masers