Cavity-enhanced Absorption Spectroscopy for Trace Gas Detection with Frontier

This application note describes cavity-enhanced absorption spectroscopy (CEAS) using a broadband source applied to larger molecules where the spectra are broader. CEAS has similarities with the better known cavity ringdown technique (CRDS) which measures the signal decay as a laser pulse emerges through one of the mirrors after successive reflections. Cavity-enhanced absorption measurements with a SLED source and Frontier with an InGaAs detector can achieve ppm sensitivity for measuring 1,3-butadiene.