Application of parabolic reflector on Raman analysis of gas samples

Anlan Yu; Duluo Zuo; Jun Gao; Bin Li; Xingbing Wang

doi:10.1117/12.2222778

12 May 2016 Application of parabolic reflector on Raman analysis of gas samples

Anlan Yu, Duluo Zuo, Jun Gao, Bin Li, Xingbing Wang

Proceedings Volume 9855, Next-Generation Spectroscopic Technologies IX; 98550A (2016) https://doi.org/10.1117/12.2222778
Event: SPIE Commercial + Scientific Sensing and Imaging, 2016, Baltimore, MD, United States

Abstract

Studies on the application of a parabolic reflector in spontaneous Raman scattering for low background Raman analysis of gas samples are reported. As an effective signal enhancing sample cell, photonic bandgap fiber (HC-PBF) or metallined capillary normally result in a strong continuous background in spectra caused by the strong Raman/fluorescence signal from the silica wall and the polymer protective film. In order to obtain enhanced signal with low background, a specially designed sample cell with double-pass and large collecting solid angle constructed by a parabolic reflector and a planar reflector was applied, of which the optical surfaces had been processed by diamond turning and coated by silver film and protective film of high-purity alumina. The influences of optical structure, polarization characteristic, collecting solid-angle and collecting efficiency of the sample cell on light propagation and signal enhancement were studied. A Raman spectrum of ambient air with signal to background ratio of 94 was acquired with an exposure time of 1 sec by an imaging spectrograph. Besides, the 3σ limits of detection (LOD) of 7 ppm for H₂, 8 ppm for CO₂ and 12 ppm for CO were also obtained. The sample cell mainly based on parabolic reflector will be helpful for compact and high-sensitive Raman system.

Citation Download Citation

Anlan Yu, Duluo Zuo, Jun Gao, Bin Li, and Xingbing Wang "Application of parabolic reflector on Raman analysis of gas samples", Proc. SPIE 9855, Next-Generation Spectroscopic Technologies IX, 98550A (12 May 2016); https://doi.org/10.1117/12.2222778

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