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Height dependence of characteristics of power spectra of temperature investigated in the surface layer of White Sands, US

: Sprung, Detlev; Sucher, Erik; Eijk, Alexander M.J. van; Eisele, Christian; Seiffer, Dirk; Stein, Karin


Stein, K.U. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Environmental Effects on Light Propagation and Adaptive Systems : 12-13 September 2018, Berlin, Germany
Bellingham, WA: SPIE, 2018 (Proceedings of SPIE 10787)
ISBN: 978-1-5106-2157-2
ISBN: 978-1-5106-2158-9
Paper 1078705, 11 pp.
Conference "Environmental Effects on Light Propagation and Adaptive Systems" <2018, Berlin>
Conference Paper
Fraunhofer IOSB ()
optical turbulence; height dependence; surface layer; ultrasonic anemometer; spectral analysis

A field trial was performed in the arid scrub area of White Sands, NM / USA in October 2017 investigating the atmospheric influence on imaging and sensor performance. In this paper we focus on the strength of optical turbulence. Optical turbulence is described by the structure function parameter of the refractive index 𝐶2𝑛. It is responsible for beam wander, blurring. and scintillation. “Ground truth” measurements of optical turbulence were carried out using a Boundary Layer Scintillometer (BLS2000). The measurements were taken along an optical path of 3.64 km and a height of 1.5 m. Additionally, height dependency of 𝐶2𝑛 is explored in the surface layer using 4 ultrasonic anemometers at discrete heights between 1 and 10 m. Power spectra of temperature were determined from time series of the ultrasonic anemometer data, which were inspected for the height dependency of spectral characteristics. The effect of the arid scrubs area on the applicability of Kolmogorov turbulence was investigated and discussed in this paper.