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Applied Optics

Applied Optics


  • Vol. 44, Iss. 23 — Aug. 10, 2005
  • pp: 4985–4994

Multibeam long-path differential optical absorption spectroscopy instrument: a device for simultaneous measurements along multiple light paths

Irene Pundt and Kai Uwe Mettendorf  »View Author Affiliations

Applied Optics, Vol. 44, Issue 23, pp. 4985-4994 (2005)

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A novel long-path differential optical absorption spectroscopy (DOAS) apparatus for measuring tropospheric trace gases and the first results from its use are presented: We call it the multibeam instrument. It is the first active DOAS device that emits several light beams simultaneously through only one telescope and with only one lamp as a light source, allowing simultaneous measurement along multiple light paths. In contrast to conventional DOAS instruments, several small mirrors are positioned near the lamp, creating multiple virtual light sources that emit one light beam each in one specific direction. The possibility of error due to scattering between the light beams is negligible. The trace-gas detection limits of NO2, SO2, O3, and H2CO are similar to those of the traditional long-path DOAS instrument.

© 2005 Optical Society of America

OCIS Codes
(120.6200) Instrumentation, measurement, and metrology : Spectrometers and spectroscopic instrumentation
(280.1120) Remote sensing and sensors : Air pollution monitoring
(300.6540) Spectroscopy : Spectroscopy, ultraviolet

Original Manuscript: July 29, 2004
Revised Manuscript: January 7, 2004
Manuscript Accepted: February 14, 2005
Published: August 10, 2005

Irene Pundt and Kai Uwe Mettendorf, "Multibeam long-path differential optical absorption spectroscopy instrument: a device for simultaneous measurements along multiple light paths," Appl. Opt. 44, 4985-4994 (2005)

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