Analytical quantification and process control

摘要

A method for high speed spectroscopic constituent verification. The method includes the steps of illuminating a sample with broadband light and measuring two preselected wavelengths of reflected light: a first narrow-range of wavelengths lambd1 that is not significantly absorbed by the constituent of interest, and a second narrow-range of wavelengths lambd2 that is substantially absorbed by the constituent of interest. Given the two measurements of reflection, upper and lower thresholds are determined (the latter based on a percentage of the measured baseline reflected light of wavelengths lambd1). Finally, the presence of the constituent of interest is indicated if the measure of the reflected discriminant wavelength lambd1 is within the upper and lower threshold measures of reflected baseline light lambd1.