A Wide Dynamic Range Photometer for Film Densitometry

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Publisher: SMPTE
Doc Type: Journal Article
Article Type: research-article
Abstract: A wide dynamic range photometer has been designed with a photomultiplier operated at constant anode current by means of a feedback circuit. The output of the photometer is accurately proportional to the logarithm of light intensity over a range as great as eight decades. The internal feedback loop is stable, with a unity-gain bandwidth up to 100 kHz, depending on the photomultiplier type and anode current. Day-long stability is better than 1% or 0.004 log units. The photometer is being used in a photographic film scanning microdensitometer.
Publication Date: 1971-06-01
DOI: 10.5594/J05788
Link: https://doi.org/10.5594/J05788
Author(s): David G. Kocher

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David G. Kocher; A Wide Dynamic Range Photometer for Film Densitometry, Journal of the SMPTE ( Volume: 80, Issue: 6, June 1971); SMPTE, 1971. Available at https://doi.org/10.5594/J05788

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David G. Kocher; A Wide Dynamic Range Photometer for Film Densitometry, Journal of the SMPTE ( Volume: 80, Issue: 6, June 1971); SMPTE, 1971. Available at https://doi.org/10.5594/J05788

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David G. Kocher; A Wide Dynamic Range Photometer for Film Densitometry, Journal of the SMPTE ( Volume: 80, Issue: 6, June 1971); SMPTE, 1971. Available at https://doi.org/10.5594/J05788

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<span class="citation">David G. Kocher; <cite>A Wide Dynamic Range Photometer for Film Densitometry</cite>, Journal of the SMPTE ( Volume: 80, Issue: 6, June 1971); SMPTE, 1971. Available at <a href="https://doi.org/10.5594/J05788" target="_blank" rel="noopener">https://doi.org/10.5594/J05788</a></span>

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David G. Kocher; A Wide Dynamic Range Photometer for Film Densitometry, Journal of the SMPTE ( Volume: 80, Issue: 6, June 1971); SMPTE, 1971
doi: 10.5594/J05788
url: https://doi.org/10.5594/J05788

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David G. Kocher; <cite id="bib-10-5594-j05788">A Wide Dynamic Range Photometer for Film Densitometry</cite>, Journal of the SMPTE ( Volume: 80, Issue: 6, June 1971); SMPTE, 1971
<span class="doi">10.5594/J05788</span>
</li>