Mid-infrared multi-mode absorption spectroscopy using interband cascade lasers for multi-species sensing

摘要

An interband cascade laser (ICL) operating at 3.7 mu m has been used to perform multimode absorption spectroscopy, MUMAS, at scan rates up to 10 kHz. Line widths of individual modes in the range 10-80 MHz were derived from isolated lines in the MUMAS signatures of HCl. MUMAS data for methane covering a spectral range of 30 nm yielded a detection level of 30 mu bar.m for 1 s measurement time at 100 Hz. Simultaneous detection of methane, acetylene, and formaldehyde in a gas mixture containing all three species is reported. (C) 2015 Optical Society of America