Sensitive carbon monoxide detection based on light-induced thermoelastic spectroscopy with a fiber-coupled multipass cell [Invited]

A sensor based on light-induced thermoelastic spectroscopy (LITES) with a fiber-coupled multipass cell was demonstrated for carbon monoxide (CO) detection. The fiber-coupled structure has the merits of reducing optical interference and difficulty in optical alignment and increasing system robustness. A 1.57 mu m continuous wave distributed feedback diode laser was used as the excitation source. A minimum detection limit of 9 ppm was obtained, and the calculated normalized noise equivalent absorption coefficient was 1.15 x 10(-7) cm(-1).W.Hz(-1/2). The reported CO-LITES sensor showed excellent linear concentration response and system stability.

Automated summary

A carbon monoxide (CO) sensor based on light-induced thermoelastic spectroscopy (LITES) with a fiber-coupled multipass cell was demonstrated, showing excellent linear concentration response and system stability. The sensor achieved a minimum detection limit of 9 ppm and a calculated normalized noise equivalent absorption coefficient of 1.15 x 10(-7) cm(-1).W.Hz(-1/2).