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"Metal Oxide Sensors for Outdoor Air Quality Monitoring"
Kristen Dorsey
Abstract:
Metal oxide gas sensors have been proposed as a solution for portable, outdoor air quality monitoring. Their low unit price and small form factor make them promising sensors for the detection of EPA-identified criteria gas pollutants. When exposed to a target gas, the conductivity of the metal oxide layer shifts, leading to a sensor response that is easily detected by readout circuitry. However, these sensors exhibit cross-response to a wide variety of weather factors, rendering them unstable for outdoor measurements.
In this seminar, I will discuss the potential applications of metal oxide sensors in outdoor air quality monitoring and characterize the response of metal oxide sensors to weather factors such as atmospheric pressure and wind. Finally, I will present models and compensation methods to reduce the sensors’ reactivity to weather factors, to improve sensor stability in outdoor environments.
Biosketch:
Dr. Kristen Dorsey is a UC President’s Postdoctoral fellow in Prof. Albert Pisano’s group in the Mechanical and Aerospace Department, UC San Diego. She obtained her B.S. in Electrical and Computer Engineering from Franklin W. Olin College of Engineering and Ph.D. in Electrical and Computer Engineering from Carnegie Mellon University. Her research interests include microsensor stability modeling and micro- and nanosensor fabrication. Outside of the lab, she is passionate about introducing young students to engineering through outreach activities. (primelab.ucsd.edu; kristendorsey.com)
Kristen Dorsey
UC President's Postdoctoral Researcher
Mechanical and Aerospace Engineering Department, UC San Diego
Friday, November 21, 2014
38-138 Engineering IV
Time: 2:00 PM – 3:00 PM
Mechanical and Aerospace Engineering Department, UC San Diego
Friday, November 21, 2014
38-138 Engineering IV
Time: 2:00 PM – 3:00 PM
Abstract:
Metal oxide gas sensors have been proposed as a solution for portable, outdoor air quality monitoring. Their low unit price and small form factor make them promising sensors for the detection of EPA-identified criteria gas pollutants. When exposed to a target gas, the conductivity of the metal oxide layer shifts, leading to a sensor response that is easily detected by readout circuitry. However, these sensors exhibit cross-response to a wide variety of weather factors, rendering them unstable for outdoor measurements.
In this seminar, I will discuss the potential applications of metal oxide sensors in outdoor air quality monitoring and characterize the response of metal oxide sensors to weather factors such as atmospheric pressure and wind. Finally, I will present models and compensation methods to reduce the sensors’ reactivity to weather factors, to improve sensor stability in outdoor environments.
Biosketch:
Dr. Kristen Dorsey is a UC President’s Postdoctoral fellow in Prof. Albert Pisano’s group in the Mechanical and Aerospace Department, UC San Diego. She obtained her B.S. in Electrical and Computer Engineering from Franklin W. Olin College of Engineering and Ph.D. in Electrical and Computer Engineering from Carnegie Mellon University. Her research interests include microsensor stability modeling and micro- and nanosensor fabrication. Outside of the lab, she is passionate about introducing young students to engineering through outreach activities. (primelab.ucsd.edu; kristendorsey.com)