Westinghouse CL-2 Cesium Vapor “Talking” Lamp 90W 5.5A
Lampe à vapeur de césium
Cäsium Dampflampe

The CL-2 lamp is an efficient source of near-infrared energy with most of the radiation associated with two strong emission lines at 8521 and 8944 Å (852.1 and 894.3 nm). Blue, green, and orange lines are also present in its spectrum. The lamp was developed in the 1940s by Westinghouse at the request of the United States Navy for infrared signaling and can be modulated at frequencies up to 10 kHz at a level up to 100% modulation. But the device was not ready for use when WW II closed.

In shipboard installations, the lamp was mounted in a parabolic reflector similar to that of a searchlight. Words spoken into a microphone in the pilothouse or beside the lamp alternately dim and brighten its infrared emanations thousands of times a second. The receiving instrument, a photo-electric cell mounted in another parabolic reflector, picked up the infrared rays; they were converted and amplified into a reproduction of the human voice.

Fiche technique • Data sheet • Datenblatt: CL-2.pdf
• H. P. Stabler, Cesium Vapor Lamp, American Journal of Physics 28, IX, 1960
• N. C. Beese, Light Sources for Optical Communication, Infrared Physics, Vol. 1, 1961
• N. C. Beese, Cesium Vapor Lamps, Journal of the Optical Society of America, Vol. 36, No. 10, October, 1946
• J. M. Frank, W.S. Huxford, and W.R. Wilson, Modulation of the Resonance Lines in a Cesium Arc, Journal of the Optical Society of America, Vol. 37, No. 9, September, 1947

 

Hauteur • Height • Höhe : 32,2 cm • 12" 5/8
Diamètre • Diameter • Durchmesser : 50 mm • 2"

Popular Science, October, 1946

 

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