Abstract

A study of the characteristics of low voltage arc discharges in cesium vapor led to the development of a practical lamp that was used in a successful communication system using infra-red radiation. The radiated energy is confined almost entirely to the cesium resonance lines at 8521 and 8944 angstroms. Data are presented that give structural details, operating characteristics, infra-red output, and efficiencies of several lamps of different sizes. Excellent modulability is attained throughout the audiofrequency range with current modulation up to 100 percent.

© 1946 Optical Society of America

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References

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  1. H. Krefft, Zeits. f. Physik 77, 752 (1932).
    [Crossref]
  2. F. L. Mohler, Bur. Stand. J. Research 9, 25 and 493 (1932).
    [Crossref]
  3. M. Beutell, Ann. d. Physik 36, 533 (1939).
    [Crossref]
  4. F. L. Mohler, J. Opt. Soc. Am. 29, 152 (1939).
    [Crossref]

1939 (2)

M. Beutell, Ann. d. Physik 36, 533 (1939).
[Crossref]

F. L. Mohler, J. Opt. Soc. Am. 29, 152 (1939).
[Crossref]

1932 (2)

H. Krefft, Zeits. f. Physik 77, 752 (1932).
[Crossref]

F. L. Mohler, Bur. Stand. J. Research 9, 25 and 493 (1932).
[Crossref]

Beutell, M.

M. Beutell, Ann. d. Physik 36, 533 (1939).
[Crossref]

Krefft, H.

H. Krefft, Zeits. f. Physik 77, 752 (1932).
[Crossref]

Mohler, F. L.

F. L. Mohler, J. Opt. Soc. Am. 29, 152 (1939).
[Crossref]

F. L. Mohler, Bur. Stand. J. Research 9, 25 and 493 (1932).
[Crossref]

Ann. d. Physik (1)

M. Beutell, Ann. d. Physik 36, 533 (1939).
[Crossref]

Bur. Stand. J. Research (1)

F. L. Mohler, Bur. Stand. J. Research 9, 25 and 493 (1932).
[Crossref]

J. Opt. Soc. Am. (1)

Zeits. f. Physik (1)

H. Krefft, Zeits. f. Physik 77, 752 (1932).
[Crossref]

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Figures (3)

Fig. 1
Fig. 1

Cesium vapor lamp.

Fig. 2
Fig. 2

Wiring diagram for operating cesium lamp. L: cesium lamp, M: modulator, C: modulation condenser of 200 to 500 mf, T1: modulation transformer, T2: starting transformer.

Fig. 3
Fig. 3

Circuit used to measure d.c. and a.c. components of infra-red radiation from cesium vapor lamps.

Tables (5)

Tables Icon

Table I Radiant energy from an experimental lamp burned at 5 amperes, mounted in a Dewar flask.

Tables Icon

Table IV Characteristics of 500-watt cesium vapor lamp.