Linear Densitometer Circuit
- 1 January 1956
- journal article
- research article
- Published by AIP Publishing in Review of Scientific Instruments
- Vol. 27 (1) , 3-5
- https://doi.org/10.1063/1.1715361
Abstract
A densitometer circuit is described which uses two photomultiplier tubes operated at constant anode current as a balanced range compressor, followed by a logarithmic difference amplifier. A density scale linear to ±0.01 density unit over a density range of 2.5 is obtained. The circuit is stable, requires no critical adjustments, and is unaffected by changes in the luminous output of the source.This publication has 6 references indexed in Scilit:
- An Electronic Circuit Which Extracts Antilogarithms DirectlyReview of Scientific Instruments, 1950
- Neutral Density Filters of Chromel A1Journal of the Optical Society of America, 1947
- A Logarithmic Photo-Multiplier Tube Photo-Meter*Journal of the Optical Society of America, 1947
- Multiplier Photo-Tube Characteristics: Application to Low Light Levels*Journal of the Optical Society of America, 1947
- A Photoelectric Cell Circuit with a Logarithmic ResponseReview of Scientific Instruments, 1937
- A Photoelectric Colorimeter with Logarithmic Response*Journal of the Optical Society of America, 1935