Vol. 18, issue 09, article # 7

pdf Grigoriev G. Yu., Malyugin S. L., Nabiev Sh. Sh., Nadezhdinskii A. I., Stavrovskii D. B., Ponurovskii Ya. Ya., Ustinov A. L. Measurements of water isotopic composition by diode laser spectroscopy method. // Atmospheric and oceanic optics. 2005. V. 18. No. 09. P. 712-716.
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A prototype of a device intended for express-measurements of water isotopic composition (Н217O, H217O, H218O, HD16O, D216O) by diode laser spectroscopy (DLS) methods is proposed for the first time. A diode laser (DL) with a distributed feedback (product of "Laser Components") with λ = 1.39 μm was used in the measurements. The DL was pumped by trapezoidal pulses with a pulse length of 0.5-1 ms, a pulse repetition frequency of 1-2 kHz, and tuning range in a mode of 1.5 cm-1 (7183.2-7185 cm--1). These parameters allowed a simultaneous determination of concentration of five water isotopomers. Real-time detection and processing of absorption spectra for water isotopes were conducted with the use of a National Instruments data acquisition board and LabVIEW software. A single measurement of isotopic ratio factor took less than 3-5 min. The range of H2O isotope measured concentrations made 0.01-100%.