00000cam 2200000zi 4500 9.958333 CaOODSP 20251217114402 m o d f cr bn||||||||| 251217e19750528oncad obt f000 0 eng d CaOODSP eng rda CaOODSP eng eng fre n-cn-on En57-58/820-1975E-PDF Sheppard, B. E. (Brian E.) author. The development of a prototype ambient light sensor for use in the runway visual range system / by Brian Sheppard = Développement du prototype d'un détecteur de la lumière ambiante pour le système de mesure de la portée visuelle de piste / par Brian Sheppard. Développement du prototype d'un détecteur de la lumière ambiante pour le système de mesure de la portée visuelle de piste Downsview, Ontario : Environment Canada, Atmospheric Environment Service, 28 May 1975. 1 online resource (36 pages, 2 unnumbered pages) : illustrations, graphs. text txt rdacontent computer c rdamedia online resource cr rdacarrier Technical memoranda, 0708-2878 ; TEC 820 ISSN of series supplied from ISSN Portal. Incorrect ISSN (0068-7804) printed in this publication. Digitized edition from print [produced by Environment and Climate Change Canada]. Includes bibliographical references (page 15). "This technical memorandum describes the development of a prototype ambient light sensor for use in the runway visual range (RVR) system. We review the definition and the computation of RVR. We compare the values of the ambient light related RVR parameters used in Canada with those used by other nations. The advantage of a continuous or multi-level ambient light measurement is considered. The results of laboratory and field tests of photovoltaic cells and photoresistors are compared with the basic sensor performance requirements for such continuous or multi-level light measurements. A circuit using a photoresistor as detector was constructed, calibrated and installed for evaluation at Toronto International Airport"--Abstract. Includes abstracts in English and French. Visibility Measurement Instruments Calibration. Airports Visibility Ontario Toronto. Visibilité Mesure Instruments Étalonnage. Visibilité sur les aéroports Ontario Toronto. Technical reports lcgft Rapports techniques rvmgf Canada. Atmospheric Environment Service, issuing body. Technical memoranda (Canada. Atmospheric Environment Service) 0708-2878 ; TEC 820. (CaOODSP)9.934501 PDF 1.41 MB https://publications.gc.ca/collections/collection_2025/eccc/en57/En57-58-820-1975-eng.pdf UDC 551.508.92 672672428