Correction for transmitter vibrations in laser scintillation measurements

Volker Thiermann; Andreas Rummel

doi:10.1117/12.332419

7 December 1998 Correction for transmitter vibrations in laser scintillation measurements

Volker Thiermann, Andreas Rummel

Proceedings Volume 3494, Atmospheric Propagation, Adaptive Systems, and Lidar Techniques for Remote Sensing II; (1998) https://doi.org/10.1117/12.332419
Event: Remote Sensing, 1998, Barcelona, Spain

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 C_n² 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.

Citation Download Citation

Volker Thiermann and Andreas Rummel "Correction for transmitter vibrations in laser scintillation measurements", Proc. SPIE 3494, Atmospheric Propagation, Adaptive Systems, and Lidar Techniques for Remote Sensing II, (7 December 1998); https://doi.org/10.1117/12.332419

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