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Journal of the Society of Motion Picture Engineers ( Volume: 49, Issue: 4, October 1947)
[ACTIVE]

Lead-Sulfide Photoconductive Cells for Sound Reproduction

Metadata

Publisher
SMPTE
Doc Type
Journal Article
Article Type
research-article
Abstract
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.
Publication Date
1947-10-01
DOI
10.5594/J11798
Link
https://doi.org/10.5594/J11798
Author(s)
R. J. Cashman
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R. J. Cashman; Lead-Sulfide Photoconductive Cells for Sound Reproduction, Journal of the Society of Motion Picture Engineers ( Volume: 49, Issue: 4, October 1947); SMPTE, 1947. Available at https://doi.org/10.5594/J11798
Snippet:
R. J. Cashman; Lead-Sulfide Photoconductive Cells for Sound Reproduction, Journal of the Society of Motion Picture Engineers ( Volume: 49, Issue: 4, October 1947); SMPTE, 1947. Available at https://doi.org/10.5594/J11798

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R. J. Cashman; Lead-Sulfide Photoconductive Cells for Sound Reproduction, Journal of the Society of Motion Picture Engineers ( Volume: 49, Issue: 4, October 1947); SMPTE, 1947. Available at https://doi.org/10.5594/J11798
Snippet:
<span class="citation">R. J. Cashman; <cite>Lead-Sulfide Photoconductive Cells for Sound Reproduction</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 49, Issue: 4, October 1947); SMPTE, 1947. Available at <a href="https://doi.org/10.5594/J11798" target="_blank" rel="noopener">https://doi.org/10.5594/J11798</a></span>

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Preview:
R. J. Cashman; Lead-Sulfide Photoconductive Cells for Sound Reproduction, Journal of the Society of Motion Picture Engineers ( Volume: 49, Issue: 4, October 1947); SMPTE, 1947
doi: 10.5594/J11798
url: https://doi.org/10.5594/J11798
Snippet:
<li>
R. J. Cashman; <cite id="bib-10-5594-j11798">Lead-Sulfide Photoconductive Cells for Sound Reproduction</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 49, Issue: 4, October 1947); SMPTE, 1947
<span class="doi">10.5594/J11798</span>
</li>