Absorption Spectrometry of Trace Moisture in Ammonia Gas with a 1371 nm Distributed-Feedback Diode Laser

We report on the sensitivity improvement of in the quantitative measurement of trace moisture in ammonia gas. A 1371 nm lnGaAsP distributed-feedback diode laser operating at room temperature was used as the light source. A dual-cell optical configuration was employed in the scheme of tunable diode l...

Full description

Saved in:
Bibliographic Details
Published in:Japanese Journal of Applied Physics 1999-08, Vol.38 (8R), p.4788
Main Authors: Wu, Shang-Qian, Masusaki, Hiroshi, Kimishima, Tetsuya, Kuze, Hiroaki, Takeuchi, Nobuo
Format: Article
Language:English
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:We report on the sensitivity improvement of in the quantitative measurement of trace moisture in ammonia gas. A 1371 nm lnGaAsP distributed-feedback diode laser operating at room temperature was used as the light source. A dual-cell optical configuration was employed in the scheme of tunable diode laser absorption spectrometry. Using signal and reference cells, both 92 cm in length, the interfering effects of absorption lines of the major constituent gas (ammonia) were canceled in a remarkable manner. Other common mode noises including the etalon fringes associated with the wavelength scan were also reduced. The system is capable of detecting trace moisture content of as low as 12 parts per billion. This is an improvement of more than two orders of magnitude compared with the conventional method of single-cell detection.
ISSN:0021-4922
1347-4065
DOI:10.1143/JJAP.38.4788