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Time-resolved polarization lock-in filtering for background suppression in Raman spectroscopy of biomass pyrolysis
- Source :
- Combustion and Flame; 224, pp 219-224 (2020), Combustion and Flame
-
Abstract
- Laser-based Raman spectroscopy is a powerful technique for non-intrusive measurements of chemical composition in gas, liquid, and solids. However, weak signals make it challenging to employ the technique for diagnostics under harsh conditions with various background interferences. To overcome such limitations, we have devised a method, polarization lock-in filtering (PLF) based on temporal modulation of the excitation laser polarization, to filter out polarization-independent signals from acquired data. The PLF method applied for continuous Raman spectroscopy measurements of a biomass pyrolysis process showed promising filtering abilities for unwanted background fluorescence signals. A broadband fluorescence background interference was suppressed by up to a factor of 50. Therefore, released species during the biomass pyrolysis process were readily identified with their Raman spectrum signatures and their amounts quantified. In addition, the PLF method provided Raman spectra of low background, from which a gradual change in hydrocarbons released at different stages during the pyrolysis could be observed. Altogether, the efficient background suppression method increases the general applicability of Raman spectroscopy under conditions where interfering signals present a challenge and a limiting factor.
- Subjects :
- Limiting factor
Materials science
General Chemical Engineering
Atom and Molecular Physics and Optics
General Physics and Astronomy
Energy Engineering and Power Technology
Energy Engineering
02 engineering and technology
Biomass pyrolysis
01 natural sciences
law.invention
symbols.namesake
Laser diagnostics
020401 chemical engineering
law
0103 physical sciences
0204 chemical engineering
010304 chemical physics
business.industry
General Chemistry
Filter (signal processing)
Polarization (waves)
Laser
Fluorescence
Fuel Technology
Raman spectroscopy
symbols
Optoelectronics
Polarization lock-in filtering
business
Pyrolysis
Excitation
Subjects
Details
- Language :
- English
- ISSN :
- 00102180
- Volume :
- 224
- Database :
- OpenAIRE
- Journal :
- Combustion and Flame
- Accession number :
- edsair.doi.dedup.....4392e7771ad4b6caaa34714a64ce0874
- Full Text :
- https://doi.org/10.1016/j.combustflame.2020.12.011