使用拉曼光谱快速、准确和精确地测量甲醇-水混合物的浓度
Rapid, accurate, and precise concentration measurements of a methanol-water mixture using Raman spectroscopy
摘要：
在这里，我们设计，构建和表征一个紧凑的拉曼光谱为基础的传感器，测量水-甲醇混合物的浓度。传感器测量浓度的精度为0.5%，精度为0.2%，测量时间为1秒。在较长的测量时间下，精度可低至0.006%。我们表征了仪器在11天的恒定测量期间的长期稳定性，并确认系统漂移在0.02%的水平上。我们描述了提高传感器性能的方法，为在恶劣环境中实现准确、精确和可靠的浓度测量提供了一条途径。该传感器也适用于其他水-醇混合物或其他小分子液体混合物。
英文摘要：
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.
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