The Eltro transmissometers for visibility measurement comparison work on the principle of a special photometric double beam. The light beam emitted from the light source is chopped and then divided into two beams by means of a beam splitter; one of them passes through the free atmosphere and then is reflected by a triple mirror. The amplitude of the other one — used as reference beam — is modulated a second time.
Airport Installation
On exhibition at the Hanover air show
Aircraft Engineering and Aerospace Technology ; 44 , 4 ; 33-34
1972-04-01
2 pages
Article (Journal)
Electronic Resource
English
Emerald Group Publishing | 1973
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