MATEC Web of Conferences
Volume 59, 20162016 International Conference on Frontiers of Sensors Technologies (ICFST 2016)
|Number of page(s)||5|
|Section||Electronic engineering and sensing technology|
|Published online||24 May 2016|
Relaxation Time Coupling Method for Ultrasonic Sensor Design
School of Electronic Information and Communications, Huazhong University of Science and Technology, Wuhan 430074, China
In our previous work [Sens. Actuator B: Chem. 203 1-8 (2014)], a ultrasonic sensor has been proposed to detect gas compositions by the acoustic spectral peak location. However, the effective relaxation area constructed by existing theoretical model cannot match the detection method when there are more than one strong relaxational components in gas mixture. A method that calculates the relaxation time of a multi-component relaxation process is presented. Based on acquirement of decoupled relaxation times and their corresponding effective specific heat values, it calculates the whole relaxation time of a multi-component relaxation process. The method is based on the fact that for a multi-component gas mixture, such as occurs in many polyatomic gas mixtures, the relaxation process should be considered as a whole rather than being decoupled as some single relaxation processes. Acquiring relaxation time provides the approach to obtain the acoustic absorption spectral peak value directly.
© Owned by the authors, published by EDP Sciences, 2016
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