Photoelectric Spectrophotometry by the Null Method (Classic Reprint) - Softcover

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Excerpt from Photoelectric Spectrophotometry by the Null Method

Another source of trouble in most deflection methods has been the difficulty of eliminating the so-called dark current; 1. E., the current through the cell when not irradiated.5 When this has not been completely eliminated or balanced, its magnitude has usually been measured and corrections made in the computa tions. Gradually, however, the technique of making photo electric cells has been improved, until now most of the cells made on the black-body -principle are found to obey very nearly the straight-line relationship, and the dark current can be much more easily suppressed.

Nevertheless, a method which eliminates any. Possible errors and the necessity of any tests, calibrations, 'or corrections due to these two factors is of much greater value and reliability than is any method into which these factors may enter.

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