Comparison of MODTRAN simulations and transmission measurements by path-integrated and in-situ techniques over a rural site in northwestern Germany

Vogelbacher, S.; van Eijk, A.M.J.; Sprung, D.; Cohen, L.H.; Sucher, E.; Stein, K.

doi:10.1117/12.2240644

Comparison of MODTRAN simulations and transmission measurements by path-integrated and in-situ techniques over a rural site in northwestern Germany

Title

Comparison of MODTRAN simulations and transmission measurements by path-integrated and in-situ techniques over a rural site in northwestern Germany

Author

Vogelbacher, S.
van Eijk, A.M.J.
Sprung, D.
Cohen, L.H.
Sucher, E.
Stein, K.

Contributor

Gonglewski, J.D. (editor)
Stein, K.U. (editor)

Publication year

2016

Abstract

A transmission experiment has been performed over an optical path of 1.53 km at a rural test site in Meppen, Northwest Germany. Direct transmission measurements were made by a 7-wavelength transmissometer. Transmission was further estimated from the average voltage received by a BLS2000 scintillometer, and evaluated with Mie theory from in-situ aerosol measurements near the optical path. Furthermore, the transmission was modeled with MODTRAN, driven with local meteorology, visibility and the rural aerosol model. For a central wavelength of 0.88μm, the transmissometer, the BLS200 and MODTRAN agree well. Remaining differences may be due to water transmission and continuum around 0.95μ;m that is picked up by the transmissometer and not by the narrow-banded BLS2000 and MODTRAN calculations. When MODTRAN is run without an aerosol model, or when this model is driven by a "default" visibility, the overlap with the measurements is extremely poor. © 2016 SPIE. The Society of Photo-Optical Instrumentation Engineers (SPIE)

Subject

2015 Observation, Weapon & Protection Systems
ED - Electronic Defence
TS - Technical Sciences
Experiment
MODTRAN
optical particle counter
scintillometer
transmission
transmissometer
Adaptive systems
Aerosols
Experiments
Meteorological instruments
Rural areas
Scintillation
Transmissions
Visibility
Aerosol measurement
MODTRAN
Optical particle counters
Remaining differences
scintillometer
Transmission experiments
Transmission measurements
Transmissometer
Adaptive optics