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Proceedings Paper

Dual-channel two-tone frequency modulation tunable diode laser spectrometer for ground-based and airborne trace gas measurements
Author(s): Frank G. Wienhold; J. Thomas Zenker; Geoff W. Harris
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Paper Abstract

We describe a new, dual-channel Tunable Diode Laser (TDL) field spectrometer for the rapid, simultaneous measurement of two species. The instrument uses two-tone frequency modulation (TTFM) with signal detection at approximately equals 12 MHz. Multiplexing is achieved using a dichroic optical element and a mechanical chopper which blocks each beam alternately. A control program running on a dedicated digital signal processor (DSP) allows the registration of the full absorption line shape each millisecond and simultaneous zero overhead on-line data reduction using a multiple linear regression algorithm. Gas exchange through the compact multireflection cell (2.71 volume, total path 53 m.) takes place in approximately equals 200 ms and thus determines the instrument response time. Applications of the spectrometer in airborne and ground based field measurement campaigns are described.

Paper Details

Date Published: 3 June 1994
PDF: 14 pages
Proc. SPIE 2112, Tunable Diode Laser Spectroscopy, Lidar, and DIAL Techniques for Environmental and Industrial Measurements, (3 June 1994); doi: 10.1117/12.177313
Show Author Affiliations
Frank G. Wienhold, Max Planck Institute for Chemistry (Germany)
J. Thomas Zenker, Max Planck Institute for Chemistry (Germany)
Geoff W. Harris, Max Planck Institute for Chemistry (Germany)


Published in SPIE Proceedings Vol. 2112:
Tunable Diode Laser Spectroscopy, Lidar, and DIAL Techniques for Environmental and Industrial Measurements
Alan Fried; Dennis K. Killinger; Harold I. Schiff, Editor(s)

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