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Using Multispectral Imaging to Reveal the Relationship between UV Absorbance and Sulphur Dioxide Concentration

Author

Listed:
  • Keru Lu

    (Department of Land Surveying and Geo-Informatics, The Hong Kong Polytechnic University, 181 Chatham Road South, Kowloon, Hong Kong)

  • Zhilin Li

    (Department of Land Surveying and Geo-Informatics, The Hong Kong Polytechnic University, 181 Chatham Road South, Kowloon, Hong Kong
    Faculty of Geosciences and Environment Engineering, Southwest Jiaotong University, Chengdu 611756, China)

  • Man Sing Wong

    (Department of Land Surveying and Geo-Informatics, The Hong Kong Polytechnic University, 181 Chatham Road South, Kowloon, Hong Kong)

Abstract

The sulphur dioxide (SO 2 ) concentration can be monitored via its absorbance in the ultraviolet (UV) region. To address the absence of a systematic study on the UV absorbance of varying SO 2 concentrations, a multispectral imaging method was implemented in the present study. SO 2 concentrations and various environmental conditions were controlled by a purpose-built environmental control system with a light path of 4.2 m. Five narrow-band-pass filters in front of a UV camera were used to implement multispectral imaging. Regression models of the relationship between UV absorbance and SO 2 concentration at each wavelength are presented. Their residuals were kept relatively small by adopting Jenks natural breaks analysis, with a maximum standard deviation of 0.086. Temperature and SO 2 concentrations were significantly associated with UV absorbance. Furthermore, smoothed look-up tables were developed to explicitly elucidate the correlation between UV absorbance and SO 2 . These have been represented as heat maps, showcasing an example of library construction using a combination of abundant research data.

Suggested Citation

  • Keru Lu & Zhilin Li & Man Sing Wong, 2022. "Using Multispectral Imaging to Reveal the Relationship between UV Absorbance and Sulphur Dioxide Concentration," Sustainability, MDPI, vol. 15(1), pages 1-17, December.
    • Handle: RePEc:gam:jsusta:v:15:y:2022:i:1:p:138-:d:1011085
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