Softwave-controlled high resolution laser photoacoustic spectrometer. Methods and programs for measuring and processing weak absorption spectra of atmospheric gases
V.A. Kapitanov, K.Y. Osipov
V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, 1, Academician Zuev square, Tomsk, 634055, Russia
Keywords: спектр поглощения, диодный лазер, оптико-акустический детектор, зеркальный модулятор, absorption spectrum, diode laser, photoacoustic detector, mirror modulator
Abstract
A softwave-controlled photoacoustic spectrometer is developed on the basis of TEC-520 diode laser (output power 30 mW, coarse tuning range 6060-6600 cm-1, line width ~ 5E-5 cm-1, fine tuning range 0 - 2.5 cm-1), WS-UIR laser wavelength meter (relative error Δλ/λ ~ 1E-8), and resonance photoacoustic detector with threshold sensitivity ~ 3E-10 W × cm-1 × Hz-1/2. Procedures and computer programs for spectra measurements and processing are developed. The results of the water vapor spectra measurements are presented.
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