The instrumental assessment of visual range

The instrumental assessment of visual range

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 t...

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Veröffentlicht in:Proceedings of the IEEE 1971-01, Vol.59 (9), p.1370-1371
1. Verfasser: Betts, J.A.
Format: Artikel
Sprache:eng
Schlagworte:
Aging
Atmosphere
Atmospheric measurements
Diodes
Frequency
Instruments
Lamps
Phase measurement
Signal detection
Switches
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Beschreibung
Zusammenfassung: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.
ISSN:0018-9219
DOI:10.1109/PROC.1971.8428