Abstract
Fiber laser intracavity spectroscopy (FLICAS) with Er-doped fiber laser has been applied for the first in situ detection of ammonia and hydrogen cyanide in a low pressure (30 Torr) stoichiometric methane/nitrogen/oxygen flame doped with 0.13–1.36% of NH 3. High resolution spectra of NH 3 and HCN have been recorded in the range of 1.5 μm (6440–6540 cm −1). The minimum detectable concentration of HCN and NH 3 at a laser pulse duration of 8 μs and room temperature is 1 × 10 13 molecule/cm 3. The method can be used for in situ detection of many other molecules in the hostile combustion environment.
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