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Proceedings Paper

Position sensing resolution in atmospheric turbulence using a position-sensitive detector (PSD)
Author(s): Anssi Jaakko Maekynen; Juha Tapio Kostamovaara
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Paper Abstract

The displacement sensing accuracy of the reflected beam method in turbulent environment is studied experimentally. The method includes an illuminated corner cube retroreflector (CCR) and a lateral effect photodiode (LEP) by which the image position of the CCR is detected. The results show turbulence (Cn approximately 5*10-7 m-1/3) limited measurement resolution to vary from 0.6 to 9 mm (standard deviation) in the distance range from 50 to 300 m. The result is 1.4 to 2.1 times worse than that measured for the direct beam sensor in the same atmospheric conditions. The type of CCR used is found to have no systematic effect on the achievable resolution but the method is found very sensitive to receiver defocusing. An approximately tenfold increase in standard deviation is observed when the receiver is defocused by 2%. The possibility to average out part of the angular fluctuations by using multiple CCRs is verified. By using two CCRs instead of one, when positioned 1.3 m apart from each other at the distance of 150 m, a resolution better by 22% is achieved. The averaging in case of the LEP, however, is not effective because the noncorrelated intensity fluctuations of the reflections from the different CCRs cancel the averaging effect.

Paper Details

Date Published: 25 September 1997
PDF: 9 pages
Proc. SPIE 3100, Sensors, Sensor Systems, and Sensor Data Processing, (25 September 1997); doi: 10.1117/12.287731
Show Author Affiliations
Anssi Jaakko Maekynen, Univ. of Oulu (Finland)
Juha Tapio Kostamovaara, Univ. of Oulu (Finland)

Published in SPIE Proceedings Vol. 3100:
Sensors, Sensor Systems, and Sensor Data Processing
Otmar Loffeld, Editor(s)

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