title: Hybrid Faraday rotation spectrometer for sub-ppm detection of atmospheric O2.
abstract: Faraday rotation spectroscopy (FRS) of O(2) is performed at atmospheric conditions using a DFB diode laser and permanent rare-earth magnets. Polarization rotation is detected with a hybrid-FRS detection method that combines the advantages of two conventional approaches: balanced optical-detection and conventional FRS with an optimized analyzer offset angle for maximum sensitivity enhancement. A measurement precision of 0.6 ppmv·Hz(-1/2) for atmospheric O(2) has been achieved. The theoretical model of hybrid detection is described, and the calculated detection limits are in excellent agreement with experimental values.
authors: Eric J
authors: EJ
authors: Zhang
authors: Brian
authors: B
authors: Brumfield
authors: Gerard
authors: G
authors: Wysocki