RELATIVE VAPOR-PRESSURE MEASUREMENTS USING A FREQUENCY-MODULATED TUNABLE DIODE-LASER, A TOOL FOR WATER ACTIVITY DETERMINATION IN SOLUTIONS

被引：12

作者：

KAURANEN, P ^{[1
]}

HARWIGSSON, I ^{[1
]}

JONSSON, B ^{[1
]}

机构：

[1] LUND UNIV,DEPT PHYS CHEM 1,S-22100 LUND,SWEDEN

来源：

JOURNAL OF PHYSICAL CHEMISTRY | 1994年 / 98卷 / 05期

关键词：

D O I：

10.1021/j100056a007

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Two-tone frequency modulation spectroscopy (TTFMS) is applied to the determination of water activity using an 820-nm GaAlAs diode laser. By measuring the relative light absorption of water vapor over a solution and over a pure water reference, the water activity in the solution is determined. Fast, nonintrusive, and selective measurements are demonstrated. The detection limit for measuring a relative water vapor pressure change was 0.3%. The application of laser modulation spectroscopy to the determination Of water activity is discussed, and suggestions on increasing the sensitivity and accuracy are presented.

引用

页码：1411 / 1415

页数：5

共 24 条

[1] DIODE-LASER MEASUREMENTS OF TEMPERATURE-DEPENDENT LINE PARAMETERS FOR WATER-VAPOR NEAR 820-NM [J].