TDLAS stands for Tunable Diode Laser Absorption Spectroscopy. The emission from a diode laser is scanned across a spectral feature. The laser line is very narrow in frequency, making TDLAS a powerful technique for measurements on the narrow lines of gases at low pressure. A comprehensive review of TDLAS has recently been published by Schiff, et al. (The use of Tunable Diode Laser Absorption Spectroscopy for Atmospheric Measurements, by H. I. Schiff, G. I. Mackay and J. Bechara, pages 239 to 318 in Air Monitoring by Spectroscopic Techniques, Markus Sigrist, Editor, John Wiley & Sons, Inc., 1994.)

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