Automated Low-Cost LED-Based Sun Photometer for City Scale Distributed Measurements

We propose a monochromatic low-cost automatic sun photometer (LoCo-ASP) to perform distributed aerosol optical depth (AOD) measurements at the city scale. This kind of network could fill the gap between current automatic ground instruments—with good temporal resolution and accuracy, but few devices...

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Autores principales:	Cristobal Garrido, Felipe Toledo, Marcos Diaz, Roberto Rondanelli
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	aerosol optical depth LED-based sun photometer network measurements Science Q
Acceso en línea:	https://doaj.org/article/32c4755d61974c849946dff9ac2acd17
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spelling	oai:doaj.org-article:32c4755d61974c849946dff9ac2acd172021-11-25T18:54:33ZAutomated Low-Cost LED-Based Sun Photometer for City Scale Distributed Measurements10.3390/rs132245852072-4292https://doaj.org/article/32c4755d61974c849946dff9ac2acd172021-11-01T00:00:00Zhttps://www.mdpi.com/2072-4292/13/22/4585https://doaj.org/toc/2072-4292We propose a monochromatic low-cost automatic sun photometer (LoCo-ASP) to perform distributed aerosol optical depth (AOD) measurements at the city scale. This kind of network could fill the gap between current automatic ground instruments—with good temporal resolution and accuracy, but few devices per city and satellite products—with global coverage, but lower temporal resolution and accuracy-. As a first approach, we consider a single equivalent wavelength around 408 nm. The cost of materials for the instrument is around 220 dollars. Moreover, we propose a calibration transfer for a pattern instrument, and estimate the uncertainties for several units and due to the internal differences and the calibration process. We achieve a max MAE of 0.026 for 38 sensors at 408 nm compared with AERONET Cimel; a mean standard deviation of 0.0062 among our entire sensor for measurement and a calibration uncertainty of 0.01. Finally, we perform city-scale measurements to show the dynamics of AOD. Our instrument can measure unsupervised, with an expected error for AOD between 0.02 and 0.03.Cristobal GarridoFelipe ToledoMarcos DiazRoberto RondanelliMDPI AGarticleaerosol optical depthLED-based sun photometernetwork measurementsScienceQENRemote Sensing, Vol 13, Iss 4585, p 4585 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	aerosol optical depth LED-based sun photometer network measurements Science Q
spellingShingle	aerosol optical depth LED-based sun photometer network measurements Science Q Cristobal Garrido Felipe Toledo Marcos Diaz Roberto Rondanelli Automated Low-Cost LED-Based Sun Photometer for City Scale Distributed Measurements
description	We propose a monochromatic low-cost automatic sun photometer (LoCo-ASP) to perform distributed aerosol optical depth (AOD) measurements at the city scale. This kind of network could fill the gap between current automatic ground instruments—with good temporal resolution and accuracy, but few devices per city and satellite products—with global coverage, but lower temporal resolution and accuracy-. As a first approach, we consider a single equivalent wavelength around 408 nm. The cost of materials for the instrument is around 220 dollars. Moreover, we propose a calibration transfer for a pattern instrument, and estimate the uncertainties for several units and due to the internal differences and the calibration process. We achieve a max MAE of 0.026 for 38 sensors at 408 nm compared with AERONET Cimel; a mean standard deviation of 0.0062 among our entire sensor for measurement and a calibration uncertainty of 0.01. Finally, we perform city-scale measurements to show the dynamics of AOD. Our instrument can measure unsupervised, with an expected error for AOD between 0.02 and 0.03.
format	article
author	Cristobal Garrido Felipe Toledo Marcos Diaz Roberto Rondanelli
author_facet	Cristobal Garrido Felipe Toledo Marcos Diaz Roberto Rondanelli
author_sort	Cristobal Garrido
title	Automated Low-Cost LED-Based Sun Photometer for City Scale Distributed Measurements
title_short	Automated Low-Cost LED-Based Sun Photometer for City Scale Distributed Measurements
title_full	Automated Low-Cost LED-Based Sun Photometer for City Scale Distributed Measurements
title_fullStr	Automated Low-Cost LED-Based Sun Photometer for City Scale Distributed Measurements
title_full_unstemmed	Automated Low-Cost LED-Based Sun Photometer for City Scale Distributed Measurements
title_sort	automated low-cost led-based sun photometer for city scale distributed measurements
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/32c4755d61974c849946dff9ac2acd17
work_keys_str_mv	AT cristobalgarrido automatedlowcostledbasedsunphotometerforcityscaledistributedmeasurements AT felipetoledo automatedlowcostledbasedsunphotometerforcityscaledistributedmeasurements AT marcosdiaz automatedlowcostledbasedsunphotometerforcityscaledistributedmeasurements AT robertorondanelli automatedlowcostledbasedsunphotometerforcityscaledistributedmeasurements
_version_	1718410578114904064

Automated Low-Cost LED-Based Sun Photometer for City Scale Distributed Measurements

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