Linear Densitometer Circuit
作者:
P. Hariharan,
M. S. Bhalla,
期刊:
Review of Scientific Instruments
(AIP Available online 1956)
卷期:
Volume 27,
issue 1
页码: 3-5
ISSN:0034-6748
年代: 1956
DOI:10.1063/1.1715361
出版商: AIP
数据来源: AIP
摘要:
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.
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