Laser hygrometer using a vertical-cavity surface-emitting laser (VCSEL) with an emission wavelength of 1.84 mu m

This paper presents a hygrometer setup for measuring the concentration of water vapor in air by means of infrared absorption spectroscopy. Recently developed vertical-cavity surface-emitting lasers (VCSELs) emitting near 1.84 mu m are used as source of the infrared light. The laser hygrometer is abl...

Full description

Saved in:

Bibliographic Details
Published in:	IEEE transactions on instrumentation and measurement Vol. 54; no. 3
Main Authors:	Lauer, C, Szalay, S, Bohm, G, Lin, C, Kohler, F, Amann, M-C
Format:	Journal Article
Language:	English
Published:	01-06-2005
Subjects:	Density Hygrometers Infrared Infrared absorption Instrumentation Lasers Mathematical analysis Vertical cavity surface emission lasers
Online Access:	Get full text
Tags:	Add Tag No Tags, Be the first to tag this record!

Description
Summary:	This paper presents a hygrometer setup for measuring the concentration of water vapor in air by means of infrared absorption spectroscopy. Recently developed vertical-cavity surface-emitting lasers (VCSELs) emitting near 1.84 mu m are used as source of the infrared light. The laser hygrometer is able to calculate the density of water molecules from the measurement of one single light-current characteristic, without any additional reference measurement. The absolute and relative humidity are calculated from the water molecule density and the temperature of the ambient air.
Bibliography:	ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23
ISSN:	0018-9456
DOI:	10.1109/TIM.2005.847195