Detection of gases by correlation spectroscopy

This paper describes the detection of various common gases by means of correlation spectroscopy, employing a complementary-source-modulation (CoSM) approach based on compact light-emitting diode (LED) sources. Theoretical results for the quantitative detection of O2, CO, and CO2 by this CoSM method are presented, using, as their basis, spectral absorption data from the Hitran database. In demonstrating the proposed detection principle, new experimental results for the detection of O2 in air are presented, with the use of practical low-cost LED sources.