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Sensors 2018, 18(1), 265; doi:10.3390/s18010265

A Prototype Sensor for In Situ Sensing of Fine Particulate Matter and Volatile Organic Compounds

1
Singapore-MIT Alliance for Research and Technology (SMART) Centre, 1 CREATE Way, CREATE Tower, #10-01, Singapore 138602, Singapore
2
Agency for Science, Technology and Research (A*STAR), National Metrology Centre (NMC), 1 Science Park Drive, Singapore 118221, Singapore
3
Parsons Laboratory, Massachusetts Institute of Technology, Room 48-425, 15 Vassar Street, Cambridge, MA 02139, USA
*
Author to whom correspondence should be addressed.
Received: 16 December 2017 / Revised: 12 January 2018 / Accepted: 16 January 2018 / Published: 18 January 2018
(This article belongs to the Collection Gas Sensors)
View Full-Text   |   Download PDF [6846 KB, uploaded 18 January 2018]   |  

Abstract

Air pollution exposure causes seven million deaths per year, according to the World Health Organization. Possessing knowledge of air quality and sources of air pollution is crucial for managing air pollution and providing early warning so that a swift counteractive response can be carried out. An optical prototype sensor (AtmOptic) capable of scattering and absorbance measurements has been developed to target in situ sensing of fine particulate matter (PM2.5) and volatile organic compounds (VOCs). For particulate matter testing, a test chamber was constructed and the emission of PM2.5 from incense burning inside the chamber was measured using the AtmOptic. The weight of PM2.5 particles was collected and measured with a filter to determine their concentration and the sensor signal-to-concentration correlation. The results of the AtmOptic were also compared and found to trend well with the Dylos DC 1100 Pro air quality monitor. The absorbance spectrum of VOCs emitted from various laboratory chemicals and household products as well as a two chemical mixtures were recorded. The quantification was demonstrated, using toluene as an example, by calibrating the AtmOptic with compressed gas standards containing VOCs at different concentrations. The results demonstrated the sensor capabilities in measuring PM2.5 and volatile organic compounds. View Full-Text
Keywords: volatile organic compounds sensor; fine particulate matter sensor; in situ real-time air quality sensor; optical sensor; multi-pass absorbance; scattering volatile organic compounds sensor; fine particulate matter sensor; in situ real-time air quality sensor; optical sensor; multi-pass absorbance; scattering
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Ng, C.-L.; Kai, F.-M.; Tee, M.-H.; Tan, N.; Hemond, H.F. A Prototype Sensor for In Situ Sensing of Fine Particulate Matter and Volatile Organic Compounds. Sensors 2018, 18, 265.

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