DocumentCode
919365
Title
The instrumental assessment of visual range
Author
Betts, J.A.
Volume
59
Issue
9
fYear
1971
Firstpage
1370
Lastpage
1371
Abstract
The theory of a transmissometer is described in which low-frequency sine wave modulation is applied to two light sources separated by the atmosphere whose transmittance is to be measured. The phase difference between the signals detected by two photocells, one at each end of the system, is related to the transmittance by an almost linear relationship.
Keywords
Aging; Atmosphere; Atmospheric measurements; Diodes; Frequency; Instruments; Lamps; Phase measurement; Signal detection; Switches;
fLanguage
English
Journal_Title
Proceedings of the IEEE
Publisher
ieee
ISSN
0018-9219
Type
jour
DOI
10.1109/PROC.1971.8428
Filename
1450358
Link To Document