Binsbergen, S.A. vanS.A. vanBinsbergenGrossmann, P.P.GrossmannCohen, L.H.L.H.CohenEijk, A.M.J. vanA.M.J. vanEijkStein, K.U.K.U.Stein2022-03-142022-03-142017https://publica.fraunhofer.de/handle/publica/40263810.1117/12.2279424This paper compares in-situ and path-averaged measurements of the electro-optical transmission, with emphasis on aerosol effects. The in-situ sensors consisted of optical particle counters (OPC) and a visibility meter, the path-averaged data was provided by a 7-wavelength transmissometer (MSRT) and a scintillometer (BLS). Data was collected at a test site in Northern Germany. A retrieval algorithm was developed to infer characteristics of the aerosol size distribution (Junge approximation) from the MSRT data. A comparison of the various sensors suggests that the optical particle counters are over-optimistic in their estimate of the transmission.en004670conference paper