A Wide-Range, Linear-Scale Photoelectric Cell Densitometer
A photoelectric cell densitometer is described that makes use of a modulated light-source, stable high-vacuum photoelectric cell, and an audio amplifier provided with a logarithmic potentiometer and multiplier supplying the desired linearity of calibration, the instrument being operated entirely by alternating current. Theoretical factors, density standards, and design problems of the instrument are also considered.
- Print ISSN
- 0097-5834
- Published
- 1937-06
- Content type
- Original Research
- DOI
- 10.5594/J08529
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