Optical turbulence over paved surfaces

Volker Thiermann; Anandakumar Karipot; Inge Dirmhirn; Peter Poschl; Christian Czekits

doi:10.1117/12.211928

15 June 1995 Optical turbulence over paved surfaces

Volker Thiermann, Anandakumar Karipot, Inge Dirmhirn, Peter Poschl, Christian Czekits

Proceedings Volume 2471, Atmospheric Propagation and Remote Sensing IV; (1995) https://doi.org/10.1117/12.211928
Event: SPIE's 1995 Symposium on OE/Aerospace Sensing and Dual Use Photonics, 1995, Orlando, FL, United States

Abstract

Modelling refractive index turbulence over paved surfaces is of significant importance to predict limitations on optical remote sensing systems operated over roads, airport runways, or urban areas. Since optical turbulence is generated by the turbulent heat transfer between ground and atmosphere, its magnitude depends on the thermal and dynamical properties of the surface. Compared with typical vegetated and unvegetated surfaces, the pavement has a significantly smaller roughness length, a lower albedo, and a higher heat conductivity and capacity. This results in a turbulent situation which is very different from that found over other areas and therefore needs special investigation. This paper presents a model to calculate the structure function constant C_n² and the inner scale l₀ of the refractive index fluctuations over a paved road. The basic input parameters are air temperature, surface temperature, and wind speed. We limit ourselves to the dry case. The model is verified by measurements taken in summer 1994 over a motorway near Vienna. Both C_n² and l₀ were determined using displaced-beam laser scintillation. The optical data is compared with the model applied to on-site meteorological observations. Good agreement is observed.

Citation Download Citation

Volker Thiermann, Anandakumar Karipot, Inge Dirmhirn, Peter Poschl, and Christian Czekits "Optical turbulence over paved surfaces", Proc. SPIE 2471, Atmospheric Propagation and Remote Sensing IV, (15 June 1995); https://doi.org/10.1117/12.211928

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available