Application of imaging spectrometer in gas analysis by Raman scattering

Duluo Zuo; Anlan Yu; Zhe Li; Xingbing Wang; Youhui Xiong

doi:10.1117/12.2187188

1 September 2015 Application of imaging spectrometer in gas analysis by Raman scattering

Duluo Zuo, Anlan Yu, Zhe Li, Xingbing Wang, Youhui Xiong

Proceedings Volume 9611, Imaging Spectrometry XX; 96110N (2015) https://doi.org/10.1117/12.2187188
Event: SPIE Optical Engineering + Applications, 2015, San Diego, California, United States

Abstract

Spontaneous Raman scattering is an effective technique in gas analysis, but the detection of minor constituents is difficult because of the low signal level and the usually existed background. Imaging spectrometer can provide highly spatial resolved spectra, so it should be much easier to pick up Raman signal of minor constituents from the Raman/fluorescence background of the sample cell and transporting optics compared with the widely used fiber-coupled spectrometers. For this reason, an imaging spectrometer was constructed from transmitting volume phase holographic grating, camera lenses and CCD detector. When it was used to analyze the gas sample in metal-lined capillary, which is a sample cell believed with great enhancement of Raman signal, the background was compressed obviously. When it was used to analyze the gas in a sample cell including a parabolic reflector, only weak background signal was observed, as the wide separation between the collecting zone (the focus point of the parabolic surface) and the wall of sample cell benefitted to the analysis by imaging spectrometer. By using the last sample cell, the signal from CO₂ in ambient air was able to be found by an exposure time about 20 sec, and limits of detection for H₂, CO₂ and CO were estimated as 60 ppm, 100 ppm and 300 ppm respectively by the results of a longer exposure time. These results show that an imaging spectrometer paired with a well-arranged sample cell will lower the detecting limit effectively.

Citation Download Citation

Duluo Zuo, Anlan Yu, Zhe Li, Xingbing Wang, and Youhui Xiong "Application of imaging spectrometer in gas analysis by Raman scattering", Proc. SPIE 9611, Imaging Spectrometry XX, 96110N (1 September 2015); https://doi.org/10.1117/12.2187188

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