TY - JOUR
T1 - Developing a Low-Cost Wearable Personal Exposure Monitor for Studying Respiratory Diseases Using Metal-Oxide Sensors
AU - Mallires, Kyle R.
AU - Wang, Di
AU - Tipparaju, Vishal Varun
AU - Tao, Nongjian
N1 - Funding Information:
Manuscript received March 20, 2019; revised April 29, 2019; accepted May 3, 2019. Date of publication May 17, 2019; date of current version August 15, 2019. This work was supported by NIH, Center of NIBIB, under Award 1U01EB021980-01. The associate editor coordinating the review of this paper and approving it for publication was Prof. Vedran Bilas. (Corresponding author: Di Wang.) K. R. Mallires is with the School for Engineering of Matter, Transport and Energy, Arizona State University, Tempe, AZ 85287 USA, and also with The Biodesign Institute, Arizona State University, Tempe, AZ 85287 USA (e-mail: kyle.mallires@asu.edu).
Publisher Copyright:
© 2001-2012 IEEE.
PY - 2019/9/15
Y1 - 2019/9/15
N2 - Global industrialization and urbanization have led to increased levels of air pollution. Those with respiratory diseases, such as asthma, are at the highest risk for adverse health effects and reduced quality of life. Studying the relationship between pollutants and symptoms is usually achieved with data from government air quality monitoring stations, but these fail to report the spatial and temporal resolution required to track a person's true exposure, especially when the majority of their time is spent indoors. We develop and build eight wrist-worn wearable devices, weighing only 64 g, to measure known asthma symptom triggers: ozone, total volatile organic compounds, temperature, humidity, and activity level. The devices use commercial off-the-shelf components, costing under $150 each to build. This report focuses on the design, calibration, and testing of the devices. Emphasis is placed on the calibration of a metal-oxide-semiconductor gas sensor for detecting ozone, which is a difficult task because of the large variations in ambient temperature and humidity found when using a wearable device. Examples of testing the devices in four real environments are also discussed: 11 days inside a well-ventilated laboratory, ten days outdoors during the summer, alternating the devices between indoor and outdoor environments to examine their response to quickly changing environments, and a field test where scripted activities are performed for a full day. The work demonstrates a wearable device for environmental health studies and addresses the challenges of existing sensors for real-world applications.
AB - Global industrialization and urbanization have led to increased levels of air pollution. Those with respiratory diseases, such as asthma, are at the highest risk for adverse health effects and reduced quality of life. Studying the relationship between pollutants and symptoms is usually achieved with data from government air quality monitoring stations, but these fail to report the spatial and temporal resolution required to track a person's true exposure, especially when the majority of their time is spent indoors. We develop and build eight wrist-worn wearable devices, weighing only 64 g, to measure known asthma symptom triggers: ozone, total volatile organic compounds, temperature, humidity, and activity level. The devices use commercial off-the-shelf components, costing under $150 each to build. This report focuses on the design, calibration, and testing of the devices. Emphasis is placed on the calibration of a metal-oxide-semiconductor gas sensor for detecting ozone, which is a difficult task because of the large variations in ambient temperature and humidity found when using a wearable device. Examples of testing the devices in four real environments are also discussed: 11 days inside a well-ventilated laboratory, ten days outdoors during the summer, alternating the devices between indoor and outdoor environments to examine their response to quickly changing environments, and a field test where scripted activities are performed for a full day. The work demonstrates a wearable device for environmental health studies and addresses the challenges of existing sensors for real-world applications.
KW - Air quality
KW - MOS
KW - asthma
KW - calibration
KW - environmental monitoring
KW - gas sensor
KW - metal oxide semiconductor
KW - ozone
KW - personal monitoring
KW - volatile organic compounds
KW - wearable device
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U2 - 10.1109/JSEN.2019.2917435
DO - 10.1109/JSEN.2019.2917435
M3 - Article
AN - SCOPUS:85071093593
SN - 1530-437X
VL - 19
SP - 8252
EP - 8261
JO - IEEE Sensors Journal
JF - IEEE Sensors Journal
IS - 18
M1 - 8717689
ER -