Dual-wavelength wide area illumination Raman difference spectroscopy for remote detection of chemicals

Remote Raman instruments have become powerful analytical tools in some special environments. However, ambient daylight is the main limitation in the data acquisition process. To suppress daylight background interference and obtain a high signal-to-background ratio (SBR), we develop a dual-wavelength...

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Bibliographic Details
Published in:Applied optics (2004) 2021-04, Vol.60 (12), p.3540
Main Authors: Ye, Jianfeng, Tian, Ziyang, Hu, Yuxin, Wei, Haoyun, Li, Yan, Zhao, Yi, Zou, Mingqiang
Format: Article
Language:English
Subjects:
Daylight
Daytime
Excitation spectra
Explosives detection
Illumination
Interference
Polystyrene resins
Raman spectra
Signal processing
Spectroscopy
Spectrum analysis
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Summary:Remote Raman instruments have become powerful analytical tools in some special environments. However, ambient daylight is the main limitation in the data acquisition process. To suppress daylight background interference and obtain a high signal-to-background ratio (SBR), we develop a dual-wavelength wide area illumination Raman difference spectroscopy (WAIRDS) system for daytime remote detection. In the WAIRDS system, a wide area illumination scheme and shifted-excitation Raman difference spectroscopy method are used to improve the reliability of collected Raman spectra. Measurements of polystyrene indicate that the WAIRDS system can be operated to obtain background-free Raman spectra under different levels of daylight background interference. The remote results show that the improvement in SBR is about three- to fivefold, and the system can work at distances of up to 9.2 m on a sunny afternoon. Moreover, to be close to the actual detection, the system is used for mineral and explosive raw material detection during daytime measurement. Measurements show that the WAIRDS system will be a useful tool for many remote applications in the future.
ISSN:1559-128X
2155-3165
DOI:10.1364/AO.422321