Computer-controlled programmable monochromator with repetitive optical scanner for accurate peak detection and background correction

Abstract

A 0.5-m grating monochromator is controlled by a minicomputer for multi-element analysis of solutions with a microwave-induced argon plasma as light source. The monochromator slews at a rate of 3.4 nm s -1 between wavelengths of analytical interest and remains at a particular wavelength until the measurement is made. A vibrating quartz plate placed behind an entrance slit repetitively scans narrow wavelength regions around the spectral lines of interest. Data acquisition is synchronized with the vibration of the quartz plate so that the profile of each line can be obtained and accurate peak detection and background correction are possible.