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