Ruo-nan JIAO, Kun LIU, Fan-yi KONG, Ting WANG, Xue HAN, Yong-jiang LI, Chang-sen SUN. Research on Coherent Anti-Stokes Raman Spectroscopy Detection of Microplastics in Seawater and Sand[J]. Spectroscopy and Spectral Analysis, 2022, 42(4): 1022
- Spectroscopy and Spectral Analysis
- Vol. 42, Issue 4, 1022 (2022)
Fig. 1. The schematic of CARS process
Fig. 2. Algorithmic framework
Fig. 3. Raman spectrum of polystyrene at different concentrations
Fig. 4. Multi-channel imaging of polystyrene centered at 1 597 cm-1
(a): The white light imaging; (b): The CARS imaging
(a): The white light imaging; (b): The CARS imaging
Fig. 5. Multi-channel imaging of polystyrene centered at 1 597 cm-1 in seawater
(a): The white light imaging; (b): The CARS imaging
(a): The white light imaging; (b): The CARS imaging
Fig. 6. CARS imaging signal of polystyrene in seawater under different exposure times
(a): Exposure time: 2 μs·pixel-1; (b): Exposure time: 8 μs·pixel-1
(a): Exposure time: 2 μs·pixel-1; (b): Exposure time: 8 μs·pixel-1
Fig. 7. CARS imaging of polystyrene in seawater under continuous scanning
Fig. 8. Raman spectrum of different sand
Fig. 9. Multi-channel imaging of sand
(a), (b) are white light and CARS images of transparent sand particles; (c), (d) are white light and CARS images of dark sand particles
(a), (b) are white light and CARS images of transparent sand particles; (c), (d) are white light and CARS images of dark sand particles
Fig. 10. Raman spectrum of different locations in sand containing polystyrene
Fig. 11. Raman spectrum of polystyrene in sand
Fig. 12. CARS imaging of polystyrene in sand centered at 1 597 cm-1
Fig. 13. CARS imaging of polystyrene in sand after processing by algorithm
(a): Median filter; (b): Erode and dilation; (c): Corrosion and expansion combined with median filtering
(a): Median filter; (b): Erode and dilation; (c): Corrosion and expansion combined with median filtering
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