Near infrared diode laser spectroscopy of C2H2, H2O, CO2 and their isotopologues and the application to TDLAS, a tunable diode laser spectrometer for the martian PHOBOS-GRUNT space mission

Open-path atmospheric transmission for a diode-pumped cesium laser

“…TDLAS has previously been used to explore atmospheric water vapor absorption features for a number of applications. Water vapor detection in the Martian atmosphere has been demonstrated for a 120 cm open path and a 10 −4 minimum detectable absorption during a single scan [19,20]. The measurement of water vapor with an uncertainty of about 1.14% was demonstrated with Voigt fits having residuals only 1 to 3 times larger than the noise.…”

Near infrared diode laser absorption spectroscopy of acetylene between 6523 and 6587cm−1

“…Several attempts have been made so far to perform sensitive detection of acetylene utilizing near-infrared laser absorption techniques, such as off-axis integrated cavity output spectroscopy (OA-ICOS) [8], cavity ring-down spectroscopy (CRDS) [9], photoacoustic spectroscopy (PAS) [10] and tunable diode laser absorption spectroscopy (TDLAS) [11]. To achieve a precision error within a few percents in the retrieved C 2 H 2 concentration, a precise knowledge of the spectroscopic parameters for the selected transitions is of high importance.…”

Validation of spectroscopic gas analyzer accuracy using gravimetric standard gas mixtures: impact of background gas composition on CO<sub>2</sub> quantitation by cavity ring-down spectroscopy

“…Although it is not yet feasible to quantify all its sources and sinks within small uncertainties (Conway et al, 1988;Schulze et al, 2009), all countries have agreed to consistently control CO 2 emissions, necessitating accurate measurements of atmospheric CO 2 mole fractions. Gas chromatography coupled with flame ionization detection (GC-FID) (van der Laan et al, 2009), nondispersive infrared spectroscopy (NDIR) at 4.26 µm (Lee et al, 2006;Min et al, 2009;Crawley, 2008;Tohjima et al, 2009), Fourier transform infrared (FTIR) spectroscopy (Griffith et al, 2012), tunable diode laser absorption spectroscopy (TDLAS) (Durry et al, 2010), wavelength-scanned cavity ring-down spectroscopy (WS-CRDS) (Crosson, 2008), and other cavity-enhanced absorption spectroscopies (O'Shea et al, 2013) are well-known techniques for quantifying atmospheric CO 2 . Despite exhibiting the advantage of high measurement precision, GC-FID suffers from long acquisition time due to delayed CO 2 retention in the separation column (typically several tens of minutes).…”