Abstract

A detailed study has been made of the electrical characteristics and light-modulation properties of a 90-watt cesium vapor arc having a three-inch column. The range of frequencies used extend from 100 to 10⁶ c.p.s. When operated on a d.c. biasing current of 5 amp., the arc has a positive resistance; below 20,000 c.p.s. its reactance is inductive, while above this frequency the reactance is chiefly capacitative. The modulation ratio for the resonance lines at 8521A and 8944A has a nearly constant value of 0.85 below 2000 c.p.s., and for higher frequencies varies inversely with the square root of the frequency.

© 1947 Optical Society of America

Spectral and Modulation Characteristics of the Concentrated-Arc*

W. S. Huxford and J. R. Platt
J. Opt. Soc. Am. 37(1) 10-15 (1947)

Cesium Vapor Lamps*

N. C. Beese
J. Opt. Soc. Am. 36(10) 555-560 (1946)

The Measurement of the Intensity Ratios of Spectral Lines with Electron Multiplier Photo-Tubes

K. G. Kessler and R. A. Wolfe
J. Opt. Soc. Am. 37(3) 133-144 (1947)

A Study Concerning Characteristics of the High-Voltage a.c. Arc

E. A. Boettner and C. F. Tufts
J. Opt. Soc. Am. 37(3) 192-198 (1947)

Power Losses from Heated Objects in Still Air

B. T. Barnes, W. E. Forsythe, and E. Q. Adams
J. Opt. Soc. Am. 37(10) 808-809 (1947)