Journal
APPLIED PHYSICS B-LASERS AND OPTICS
Volume 90, Issue 2, Pages 191-196Publisher
SPRINGER
DOI: 10.1007/s00340-007-2821-5
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A photoacoustic (PA) sensor has been developed to monitor hydrogen chloride at sub-ppm level in the 1740-nm region. The system was designed to control the process in the novel low-water-peak optical fiber manufacturing process. Relaxation effects in hydrogen chloride PA detection in oxygen-helium and nitrogen-helium gas mixtures are presented, showing that the generation of the PA signal is strongly affected by the ratio of these substances. In addition, the role of water vapor in the PA signal is investigated.
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