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Journal of the Society of Motion Picture Engineers ( Volume: 33, Issue: 10, October 1939)
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Use of an A-C Polarized Photoelectric Cell for Light-Valve Bias Current Determination

Metadata

Publisher
SMPTE
Doc Type
Journal Article
Article Type
research-article
Abstract
The use of an a-c polarizing potential on a gas type PEC produces an alternating output current as compared with the continuous current obtained with a d-c polarizing potential. If the output voltage from the cell is suitably connected to a conventional audio-frequency amplifier and copper-oxide rectifer meter, the equipment may be conveniently used as an exposure meter. When used for the line-up of variable-density light-valves, the proper bias current, lamp adjustment, and lamp current may be readily determined. Variations of valve spacing and lamp current are also indicated. Numerous other applications for such a meter are being con. sidered.
Publication Date
1939-10-01
DOI
10.5594/J11939
Link
https://doi.org/10.5594/J11939
Author(s)
C. R. Daily
Source Data (JSON)

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Plain text (ISO 690 compliant)

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C. R. Daily; Use of an A-C Polarized Photoelectric Cell for Light-Valve Bias Current Determination, Journal of the Society of Motion Picture Engineers ( Volume: 33, Issue: 10, October 1939); SMPTE, 1939. Available at https://doi.org/10.5594/J11939
Snippet:
C. R. Daily; Use of an A-C Polarized Photoelectric Cell for Light-Valve Bias Current Determination, Journal of the Society of Motion Picture Engineers ( Volume: 33, Issue: 10, October 1939); SMPTE, 1939. Available at https://doi.org/10.5594/J11939

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Preview:
C. R. Daily; Use of an A-C Polarized Photoelectric Cell for Light-Valve Bias Current Determination, Journal of the Society of Motion Picture Engineers ( Volume: 33, Issue: 10, October 1939); SMPTE, 1939. Available at https://doi.org/10.5594/J11939
Snippet:
<span class="citation">C. R. Daily; <cite>Use of an A-C Polarized Photoelectric Cell for Light-Valve Bias Current Determination</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 33, Issue: 10, October 1939); SMPTE, 1939. Available at <a href="https://doi.org/10.5594/J11939" target="_blank" rel="noopener">https://doi.org/10.5594/J11939</a></span>

SMPTE Icon SMPTE's HTML Pub

Preview:
C. R. Daily; Use of an A-C Polarized Photoelectric Cell for Light-Valve Bias Current Determination, Journal of the Society of Motion Picture Engineers ( Volume: 33, Issue: 10, October 1939); SMPTE, 1939
doi: 10.5594/J11939
url: https://doi.org/10.5594/J11939
Snippet:
<li>
C. R. Daily; <cite id="bib-10-5594-j11939">Use of an A-C Polarized Photoelectric Cell for Light-Valve Bias Current Determination</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 33, Issue: 10, October 1939); SMPTE, 1939
<span class="doi">10.5594/J11939</span>
</li>