|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||D-22: AC Analysis of Impedancemetric, Electrochemical NOx Sensors for Emission Control
||Andrew Marshall, Ling Cui, Joe Fitzpatrick, Brett Henderson, Robert Novak, Jaco Visser, Victor Wang, Leta Woo, Jud Ready
|On-Site Speaker (Planned)
Impedance-based or so-called impedancemetric NOx gas sensors have been demonstrated as a potential method for low-cost NOx detection in combustion applications. A design with a yttria-stabilized zirconia (YSZ) electrolyte and two electrodes have shown promise as a good sensor candidate. Similar to automotive exhaust gas sensors, designs using YSZ are operated at higher temperatures typically greater than 550°C. A test gas with part-per-million (ppm) concentrations of NOx is used to evaluate the sensor, and an alternating (ac) signal is applied, allowing for the impedance signal to be measured. Phase angle has been determined to be a reliable measure for gas content, and may be derived from impedance. Frequency sweeps over a range of values from 1 MHz to 1Hz and constant frequency tests have been used to evaluate sensor performance. Sensor performance in terms of sensitivity and stability are related to testing parameters such as frequency and temperature.
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