Abstract

A split-beam system of spectrophotometry is described in which each of the two beams is modulated at a different frequency. A single photomultiplier is used as a detector. Separation and amplification of the two frequencies are effected by tuned amplifiers. Percent transmission versus wavelength data is recorded automatically in the region 2050A to 4000A using a hydrogen discharge lamp, and in the region 3200A to 7000A using a tungsten lamp as a source. Either of these ranges is scanned in less than ten minutes and the accuracy at an optical density of 2 is about ten percent. The optical system of the commercial monochromator used is in no way altered.

© 1953 Optical Society of America

A Ratio Recording Double-Beam Ultraviolet Spectrophotometer

William H. King
J. Opt. Soc. Am. 43(10) 866-869 (1953)

Photoelectric Raman Spectrometer with Automatic Range Changing. I. Conversion of Photographic Instrument*

Robert F. Stamm, C. F. Salzman, and Thomas Mariner
J. Opt. Soc. Am. 43(2) 119-125 (1953)

An Apparatus for Automatic Recording of Reflection Spectra

James H. Schulman and Clifford C. Klick
J. Opt. Soc. Am. 43(6) 516-519 (1953)

An Automatic Recording Photographic Densitometer*

George Barnes
J. Opt. Soc. Am. 43(12) 1176-1180 (1953)

A Ratio-Recording Double-Beam Infra-Red Spectrophotometer with Automatic Slit-Control*†

D. F. Hornig, G. E. Hyde, and W. A. Adcock
J. Opt. Soc. Am. 40(8) 497-503 (1950)