Related Experiment Video
Updated: Aug 15, 2026

Subsurface Defect Localization by Structured Heating Using Laser Projected Photothermal Thermography
Published on: May 15, 2017
Detection of high-temperature water vapor at 940 nm with vertical-cavity surface-emitting lasers
Heidi Cattaneo1, Rolf Hernberg
1Optics Laboratory, Institute of Physics, Tampere University of Technology, P.O. Box 692, FI-33101 Tampere, Finland. heidi.cattaneo@tut.fi
Abstract:
A vertical-cavity surface-emitting laser was used to study the absorption of water vapor in the 940 nm region. Measurements for several absorption lines within the 2 v1 + V3 vibrational band were performed. Line strengths at room temperature and in a heated absorption cell over the temperature range of 420-970 K were obtained. The line strength values were in good agreement with simulations based on the values of the HITRAN 2004 database. The measurements also showed that water vapor transitions near 940 nm are suitable for sensitive temperature determination.
Related Concept Videos
UV–Vis Spectrometers
Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview

