A Photoelectric Method of Measuring Directly the Ratio of Two Illuminations
- 1 February 1945
- journal article
- research article
- Published by IOP Publishing in Journal of Scientific Instruments
- Vol. 22 (2) , 34-36
- https://doi.org/10.1088/0950-7671/22/2/304
Abstract
A circuit is described which utilizes the approximately logarithmic voltage-current characteristic of gas-filled photocells to measure the ratio of two light intensities independent of the absolute intensity within fairly wide limits. Application to absorption and reflection measurements is indicated.This publication has 3 references indexed in Scilit:
- A Photoelectric Photometer for Measuring the Light Scattered by the Surface of a Transparent MaterialJournal of Scientific Instruments, 1944
- Vacuum Tube Circuit to Measure the Logarithm of a Direct CurrentReview of Scientific Instruments, 1939
- A Vacuum-Tube Voltmeter with Logarithmic ResponseReview of Scientific Instruments, 1933