Die Photoakustische Infrarot-Laserspektroskopie Zur Schadgasanalyse (Photoacoustic Infrared Laser Spectroscopy for Analyzing Gaseous Contaminants)

摘要

Photoacoustic laser spectroscopy for trace gas analyses is discussed. Concentrations up to the ppb-scale and even molecular parameters as the line strength can be measured with great precision. A developed cell, 102 cm long, using 50 mw (monomode), with comparatively less laser energy than a carbon dioxide laser, can indicate an absorption difference up to 0.00001, which corresponds to 44 ppb of CO.