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Proceedings Paper

Active carbon filter health condition detection with piezoelectric wafer active sensors
Author(s): Jingjing Bao; Victor Giurgiutiu; Glenn O. Rubel; Gregory W. Peterson; Thomas M. Ball
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Paper Abstract

The impregnated active carbon used in air purification systems degrades over time due to exposure to contamination and mechanical effects (packing, settling, flow channeling, etc.). A novel approach is proposed to detect contamination in active carbon filters by combining the electromechanical impedance spectroscopy (EMIS) and electrochemical impedance spectroscopy (ECIS). ECIS is currently being used to evaluate active carbon filtration material; however, it cannot differentiate the impedance changes due to chemical contamination from those due to mechanical changes. EMIS can detect impedance changes due to mechanical changes. For the research work presented in this paper, Piezoelectric wafer active sensor (PWAS) was used for the EMIS method. Some remarkable new phenomena were unveiled in the detection of carbon filter status. 1. PWAS EMIS can detect the presence of contaminants, such as water and kerosene in the carbon bed 2. PWAS EMIS can monitor changes in mechanical pressure that may be associated with carbon bed packing, settling and flow channeling 3. EMIS and ECIS measurements are consistent with each other and complimentary A tentative simplified impedance model was created to simulate the PWAS-carbon bed system under increasing pressure. Similar impedance change pattern was observed when comparing the simulation results with experimental data.

Paper Details

Date Published: 13 April 2011
PDF: 12 pages
Proc. SPIE 7981, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2011, 79811E (13 April 2011); doi: 10.1117/12.880521
Show Author Affiliations
Jingjing Bao, Univ. of South Carolina (United States)
Victor Giurgiutiu, Univ. of South Carolina (United States)
Glenn O. Rubel, Edgewood Chemical Biological Ctr. (United States)
Gregory W. Peterson, Edgewood Chemical Biological Ctr. (United States)
Thomas M. Ball, Univ. of South Carolina (United States)

Published in SPIE Proceedings Vol. 7981:
Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2011
Masayoshi Tomizuka, Editor(s)

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