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Spatial mapping and analysis of aerosols during a forest fire using computational mobile microscopy
Author(s): Yichen Wu; Ashutosh Shiledar; Yi Luo; Jeffrey Wong; Cheng Chen; Bijie Bai; Yibo Zhang; Miu Tamamitsu; Aydogan Ozcan
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Paper Abstract

Forest fires are a major source of particulate matter (PM) air pollution on a global scale. The composition and impact of PM are typically studied using only laboratory instruments and extrapolated to real fire events owing to a lack of analytical techniques suitable for field-settings. To address this and similar field test challenges, we developed a mobilemicroscopy- and machine-learning-based air quality monitoring platform called c-Air, which can perform air sampling and microscopic analysis of aerosols in an integrated portable device. We tested its performance for PM sizing and morphological analysis during a recent forest fire event in La Tuna Canyon Park by spatially mapping the PM. The result shows that with decreasing distance to the fire site, the PM concentration increases dramatically, especially for particles smaller than 2 µm. Image analysis from the c-Air portable device also shows that the increased PM is comparatively strongly absorbing and asymmetric, with an aspect ratio of 0.5–0.7. These PM features indicate that a major portion of the PM may be open-flame-combustion-generated element carbon soot-type particles. This initial small-scale experiment shows that c-Air has some potential for forest fire monitoring.

Paper Details

Date Published: 13 February 2018
PDF: 9 pages
Proc. SPIE 10485, Optics and Biophotonics in Low-Resource Settings IV, 104850T (13 February 2018); doi: 10.1117/12.2288889
Show Author Affiliations
Yichen Wu, Univ. of California, Los Angeles (United States)
Ashutosh Shiledar, Univ. of California, Los Angeles (United States)
Yi Luo, Univ. of California, Los Angeles (United States)
Jeffrey Wong, Univ. of California, Los Angeles (United States)
Cheng Chen, Univ. of California, Los Angeles (United States)
Bijie Bai, Univ. of California, Los Angeles (United States)
Yibo Zhang, Univ. of California, Los Angeles (United States)
Miu Tamamitsu, Univ. of California, Los Angeles (United States)
Aydogan Ozcan, Univ. of California, Los Angeles (United States)


Published in SPIE Proceedings Vol. 10485:
Optics and Biophotonics in Low-Resource Settings IV
David Levitz; Aydogan Ozcan; David Erickson, Editor(s)

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