Position sensing resolution in atmospheric turbulence using a position-sensitive detector (PSD)

Anssi Jaakko Maekynen; Juha Tapio Kostamovaara

doi:10.1117/12.287731

25 September 1997 Position sensing resolution in atmospheric turbulence using a position-sensitive detector (PSD)

Anssi Jaakko Maekynen, Juha Tapio Kostamovaara

Proceedings Volume 3100, Sensors, Sensor Systems, and Sensor Data Processing; (1997) https://doi.org/10.1117/12.287731
Event: Lasers and Optics in Manufacturing III, 1997, Munich, Germany

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 (C_n 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.

Citation Download Citation

Anssi Jaakko Maekynen and Juha Tapio Kostamovaara "Position sensing resolution in atmospheric turbulence using a position-sensitive detector (PSD)", Proc. SPIE 3100, Sensors, Sensor Systems, and Sensor Data Processing, (25 September 1997); https://doi.org/10.1117/12.287731

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