DocumentCode :
1124161
Title :
9.6 - A dual wavelength optical distance measuring instrument which corrects for air density
Author :
Earnshaw, K.B. ; Owens, J.C.
Author_Institution :
Environmental Science Service Admin., Boulder, Colo.
Volume :
3
Issue :
11
fYear :
1967
fDate :
11/1/1967 12:00:00 AM
Firstpage :
544
Lastpage :
550
Abstract :
An instrument has been constructed which simultaneously measures optical path length at two wavelengths and so permits determination of average refractive index over the common path and hence distance to 1 \\times 10^{-6} or better without extensive meteorological observations. Using a He-Ne laser (6328 Å) and a filtered high-pressure mercury arc lamp (3681 Å), the instrument is expected to measure distances to 15 kilometers with accuracies as high as a few parts in ten million. Preliminary measurements over a 5.3-km path give a standard deviation of 0.15 cm, or better than 3 \\times 10^{-7} .
Keywords :
Density measurement; Instruments; Length measurement; Measurement standards; Meteorology; Optical filters; Optical refraction; Optical variables control; Refractive index; Wavelength measurement;
fLanguage :
English
Journal_Title :
Quantum Electronics, IEEE Journal of
Publisher :
ieee
ISSN :
0018-9197
Type :
jour
DOI :
10.1109/JQE.1967.1074403
Filename :
1074403
Link To Document :
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