Hybrid Faraday rotation spectrometer for sub-ppm detection of atmospheric O_2 | Zendy

Eric Zhang | Zendy; Brian E. Brumfield | Zendy; Gerard Wysocki | Zendy

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Hybrid Faraday rotation spectrometer for sub-ppm detection of atmospheric O_2

Author(s) -

Eric Zhang,

Brian E. Brumfield,

Gerard Wysocki

Publication year - 2014

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.22.015957

Subject(s) - faraday effect , optics , spectrometer , polarization (electrochemistry) , materials science , offset (computer science) , laser , spectrum analyzer , faraday rotator , spectroscopy , optical isolator , polarimetry , sensitivity (control systems) , rotation (mathematics) , remote sensing , physics , magnetic field , scattering , chemistry , geometry , mathematics , quantum mechanics , electronic engineering , geology , computer science , programming language , engineering

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.

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