Improved Mobile Application for Measuring Aerosol Optical Thickness in the Ultraviolet-A Wavelength

Che Heng Fung, Man Sing Wong

Research output: Journal article publicationJournal articleAcademic researchpeer-review

6 Citations (Scopus)


This paper illustrates an advanced development for mobile measurement of aerosol optical thickness (AOT) in the ultraviolet-A region, with the improvements of 1) a new solar positioning bubble operating in the smartphone that assists accurate pointing of smartphone's camera to the sun and 2) a robust calibration method using Ångström exponent that is applicable to the AOTs at different wavelengths. This paper develops a new calibration method at 340-nm AOT. In addition, a very high adjusted R-square of 96.9% was observed when compared with a Microtops II sunphotometer on five different days. In addition, a mean percentage difference of 7.8% compared with Microtops II sunphotometer was achieved. This new mobile application and new sensing device work well in different atmospheric conditions, and provide effective hand-held, in-situ measurement of AOT that is comparable with a professional-grade instrument.
Original languageEnglish
Article number7350098
Pages (from-to)2055-2059
Number of pages5
JournalIEEE Sensors Journal
Issue number7
Publication statusPublished - 1 Apr 2016


  • aerosol optical thickness
  • bandpass filter
  • MicrotopsII sunphotometer
  • smartphone

ASJC Scopus subject areas

  • Instrumentation
  • Electrical and Electronic Engineering


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