Advanced

Relative Vapor-pressure Measurements Using A Frequency-modulated Tunable Diode-laser, A Tool For Water Activity Determination In Solutions

Kauranen, P; Harwigsson, I and Jonsson, B (1994) In Journal of Physical Chemistry 98(5). p.1411-1415
Abstract
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.
Please use this url to cite or link to this publication:
author
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Physical Chemistry
volume
98
issue
5
pages
1411 - 1415
publisher
The American Chemical Society
external identifiers
  • Scopus:0346164874
ISSN
0022-3654
DOI
10.1021/j100056a007
language
English
LU publication?
no
id
366cb002-cdc0-4914-9e7c-d66096f77220 (old id 2258576)
date added to LUP
2012-02-18 14:06:08
date last changed
2017-01-01 07:49:14
@article{366cb002-cdc0-4914-9e7c-d66096f77220,
  abstract     = {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.},
  author       = {Kauranen, P and Harwigsson, I and Jonsson, B},
  issn         = {0022-3654},
  language     = {eng},
  number       = {5},
  pages        = {1411--1415},
  publisher    = {The American Chemical Society},
  series       = {Journal of Physical Chemistry},
  title        = {Relative Vapor-pressure Measurements Using A Frequency-modulated Tunable Diode-laser, A Tool For Water Activity Determination In Solutions},
  url          = {http://dx.doi.org/10.1021/j100056a007},
  volume       = {98},
  year         = {1994},
}