Abstract

A method for the compensation of a variable light source in photoelectric spectrophotometry is presented. The outputs of a scanning photo-cell and a monitoring cell are fed to two amplifiers. The outputs of these amplifiers are then fed to a self-balancing recording potentiometer. The equipment has laboratory as well as astrophysical applications. The limiting magnitude at which useful spectrophotometry with a resolution of 1A is approximately 4. Further development work is in progress.

© 1950 Optical Society of America

Application of Photoelectric Multiplier Tubes to the Sensitive Measurement of Absorption or of Changes of Relative Light Intensities

O. Oldenberg and H. P. Broida
J. Opt. Soc. Am. 40(6) 381-385 (1950)

Slit-Width Effects in Spectrophotometry

W. H. Eberhardt
J. Opt. Soc. Am. 40(3) 172-176 (1950)

A Photometric Separator for Precision Visual Spectrophotometry

J. Terrien and F. Desvignes
J. Opt. Soc. Am. 40(12) 845-848 (1950)

Photoelectric Light-Scattering Photometer for Determining High Molecular Weights*

B. A. Brice, M. Halwer, and R. Speiser
J. Opt. Soc. Am. 40(11) 768-778 (1950)

High Precision Measurements with Simple Equipment*

A. C. S. van Heel
J. Opt. Soc. Am. 40(12) 809-816 (1950)