近赤外半導体レーザーを光源とする光熱変換水分分析(<特集>高度技術を支える分析化学)

概要

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Photothermal spectrometry for water is described in which high-power diode laser with a wavelength coincident with strong vibrational overtone absorption in a near-infrared region was used. In the thermal lens technique, an apparatus consisting of only solid-state devices, such as optical fibers, as fiber-coupler and photodiode, was used. The optical fibers acted as not only optical paths, but also as collimation devices. A water content of 0.15% in acetonitrile could be detected, and a linear analytical curve was obtained in the range of 0%〜7% with a 1478 nm, 100 mW diode laser at an intensity modulation frequency of 20 Hz. A photoacoustic technique could be also applied to water in acetonitrile and water adsorbed on molecular sieves by using a cell equipped with a cylindrical piezoelectric ceramic. These techniques can be a versatile water-analysis tool for the process monitoring and control.
社団法人日本分析化学会の論文
2001-12-05