Lead-Sulfide Photoconductive Cells for Sound Reproduction

Lead-sulfide photoconductive cells developed during the war at Northwestern University show considerable promise in sound reproduction. These cells, in contrast with cesium-oxide phototubes used in present systems, exhibit a much higher signal-to-noise output and a lower impedance. The cell noise is not increased in the presence of background radiation. The frequency response is excellent and the sensitive surface is undamaged by high-light levels. As a result of the high infrared sensitivity of these cells, an indirectly heated exciter lamp has been developed which operates with an ordinary 60-cycle filament transformer. Radio-frequency or direct-current heating of exciter lamps is thus not required.

Print ISSN

0097-5834

Published

1947-10

Content type

Original Research

DOI

10.5594/J11798