Broadband cavity enhanced absorption spectroscopy using light emitting diodes
Abstract
A broadband variant of cavity enhanced absorption spectroscopy has been demonstrated at visible wavelengths using red and green light emitting diodes. The broadband CEAS spectrum of a mixture of molecular oxygen and water vapour has been recorded with a bandwidth of 60 nm centred at 675 nm. Quantitative amounts of three atmospherically important absorbers (NO 3, NO 2 and I 2) have also been retrieved from broadband CEAS spectra of laboratory samples at high dilution using spectral fitting techniques adapted from differential optical absorption spectroscopy.
- Publication:
-
Chemical Physics Letters
- Pub Date:
- November 2004
- DOI:
- 10.1016/j.cplett.2004.08.144
- Bibcode:
- 2004CPL...398...68B