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This paper was published in:

Applied Physics B
Lasers and Optics

Springer-Verlag 1998
Appl. Phys. B 67, 297-305

Gas Monitoring in Process Industry Using Diode Laser Spectroscopy

Ivar Linnerud Peter Kaspersen and Tycho Jæger
Norsk Elektro Optikk A/S
Solheimv. 62 A, P.O. Box 384
N-1471 Skårer, Norway (1)
Fax. +47 67 97 49 00


Abstract

Gas monitors for industrial applications must have high reliability and require little maintenance. Monitors for in-situ measurements using tuneable diode laser absorption spectroscopy in the near infra-red, can meet these requirements. A brief description of monitors using high frequency wavelength modulation spectroscopy with second harmonic detection, is presented. Some problems related to industrial applications are discussed, in particular line broadening effects, and frequency drift of diode lasers. Typical applications for monitoring of O2, CO, NH3, HCl and HF are described together with measurements from several installations. The monitors show continuous measurements with fast response and good sensitivity, all of which is difficult to obtain with conventional techniques such as wet chemical analysis.

PACS: 42.60.Fc; 42.62.Cf; 82.80.Ch


(1) New Address:
Norsk Elektro Optikk A/S
Solheimv. 62 A, P.O. Box 384
N-1471 Lørenskog, Norway


Download: Complete paper in .pdf format (Adobe Acrobat) (427kB)

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