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

Che Heng Fung; Man Sing Wong

doi:10.1109/JSEN.2015.2507202

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

Che Heng Fung, Man Sing Wong

Research output: Journal article publication › Journal article › Academic research › peer-review

6 Citations (Scopus)

Abstract

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 language	English
Article number	7350098
Pages (from-to)	2055-2059
Number of pages	5
Journal	IEEE Sensors Journal
Volume	16
Issue number	7
DOIs	https://doi.org/10.1109/JSEN.2015.2507202
Publication status	Published - 1 Apr 2016

Keywords

aerosol optical thickness
bandpass filter
MicrotopsII sunphotometer
smartphone

ASJC Scopus subject areas

Instrumentation
Electrical and Electronic Engineering

More information

10.1109/JSEN.2015.2507202

Cite this

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abstract = "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 {\AA}ngstr{\"o}m 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.",

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

Abstract

Keywords

ASJC Scopus subject areas

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