Distance corrections for single- and dual-color lasers by ray tracing

Details Distance corrections for single- and dual-color lasers by ray tracing Distance corrections for single- and dual-color lasers by ray tracing

Nov 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980jgr....85.6513b&link_type=abstract

Journal of Geophysical Research, vol. 85, Nov. 10, 1980, p. 6513-6520.

Astronomy and Astrophysics

Astronomy

1

Crustal Fractures, Earth Crust, Laser Range Finders, Ray Tracing, Two-Wavelength Lasers, Astronomical Observatories, Celestial Geodesy, Error Correcting Devices, Instrument Errors, Refractivity

Scientific paper

The physical arc length difference between the red and blue beam of a dual-color laser generates an error term in determining Delta-n as well as n (the refractive index) and D (the line length). Numerical ray trace examples and theoretical approximations show that the resulting relative error Delta-D/D increases as D-squared. Error reduction by a factor of nearly 10 is possible by using the pressure, temperature, and humidity of both endpoints to calculate n. The present study results from a desire to improve the precision of monitoring the local and regional position of the Lunar Laser Ranging Observatory atop Haleakala, Maui, Hawaii; the monitoring of the earth's crustal deformation and strain is a primary concern of the study.

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