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Proceedings Paper

Correction for transmitter vibrations in laser scintillation measurements
Author(s): Volker Thiermann; Andreas Rummel
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Paper Abstract

Mechanical transmitter vibration is an important reason for errors in scintillation measurements, especially when using laser sources. The effect is due to the movement of the emitted beam caused by translational and rotational vibrations of the transmitter in combination with the finite beam width. The movement of the beam across the receiver results in intensity fluctuations which are not caused but often erroneously interpreted by turbulence. This paper presents a technique to identify and quantify the contribution of vibration to the measured intensity fluctuations. The technique uses detectors with a spacing larger than the Fresnel zone. Correlations of the intensity fluctuations measured at these spaced detectors are mainly caused by transmitter vibrations and are used for correcting the measured intensity fluctuations at the individual detectors to infer the pure turbulence effect. In an experiment, vibrations of different magnitude are simulated using a rotating wedge prism in front of a scintillometer transmitter. The measured data are compared with the data of a second scintillometer, with and without the vibration correction applied. Structure function constant Cn2 and inner scale l0 of refractive index fluctuations are derived from corrected and uncorrected data. This demonstrates the effectiveness and importance of the vibration correction.

Paper Details

Date Published: 7 December 1998
PDF: 10 pages
Proc. SPIE 3494, Atmospheric Propagation, Adaptive Systems, and Lidar Techniques for Remote Sensing II, (7 December 1998); doi: 10.1117/12.332419
Show Author Affiliations
Volker Thiermann, Scintec Atmosphaerenmesstechnik AG (Germany)
Andreas Rummel, Scintec Atmosphaerenmesstechnik AG (Germany)

Published in SPIE Proceedings Vol. 3494:
Atmospheric Propagation, Adaptive Systems, and Lidar Techniques for Remote Sensing II
Adam D. Devir; Anton Kohle; Ulrich Schreiber; Christian Werner, Editor(s)

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