Rapid, accurate, and precise concentration measurements of a methanol-water mixture using Raman spectroscopy
Abstract
Here we design, construct, and characterize a compact Raman-spectroscopy-based sensor that measures the concentration of a water-methanol mixture. The sensor measures the concentration with an accuracy of 0.5% and a precision of 0.2% with a 1 second measuring time. With longer measurement times, the precision reaches as low as 0.006%. We characterize the long-term stability of the instrument over an 11-day period of constant measurement, and confirm that systematic drifts are on the level of 0.02%. We describe methods to improve the sensor performance, providing a path towards accurate, precise, and reliable concentration measurements in harsh environments. This sensor should be adaptable to other water-alcohol mixtures, or other small-molecule liquid mixtures.
Keywords
Cite
@article{arxiv.1806.06404,
title = {Rapid, accurate, and precise concentration measurements of a methanol-water mixture using Raman spectroscopy},
author = {Daniel D. Hickstein and Russell Goldfarmmuren and Jack Darrah and Luke Erickson and Laura A. Johnson},
journal= {arXiv preprint arXiv:1806.06404},
year = {2018}
}
Comments
13 pages, 6 figures