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Gas temperature measurements using wavelength modulation spectroscopy at 1.39 žm

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Cai T. , Tan T. , Wang G. , Chen W. , Gao X.

2009

tom Vol. 39, nr 1

13--29

Gas temperature measurements in a combustion system by using wavelength modulation spectroscopy 2f ratio of two selected transitions method were presented for 1.39 žm. Wavelength modulation was performed at 35 kHz, and was superimposed on 500 Hz wavelength scans in order to recover full second-harmonic line shapes. H2O line-pair at 7164.901 cm-1 and 7165.215 cm-1 was selected for this measurement. The criteria of the line-pair selection were discussed. The sensitivity and accuracy of the sensor were demonstrated in a static cell in laboratory (over the temperature range of 400-1000 K, average bias ?T ~ 5 K). Burner experiments demonstrate the ability of our system forin situ measurements. The influence caused by variation of total pressure and species concentration in burning gas during combustion was also discussed.

Highly-efficient fully-fiberized mid-infrared differential frequency generation source and its application to laser spectroscopy

100%

Krzempek K. , Dudzik G. , Hudzikowski A. , Gluszek A. , Abramski K.

tom Vol. 25, No. 4

269--274

Widely-tunable, fully-monolithic, mid-infrared (mid-IR) deference frequency generation source (DFG) is presented. By using a custom designed fiber-pigtailed periodically poled lithium niobate (PPLN) crystal module the idler beam was generated with an efficiency of 21%/W, yielding 2.6 mW of optical output power. The proposed all-fiber configuration radically simplified the optical frequency conversion setup, making it robust and easily configurable. The usefulness of the constructed source was verified by performing simultaneous wavelength modulation spectroscopy (WMS) laser trace gas detection of methane, near 2999 cm⁻¹, and ethane, near 2997 cm⁻¹, via two independently generated, tunable idler beams.