A Wireless, Passive, Magnetically-soft Harmonic Sensor for Monitoring Sodium Hypochlorite Concentrations in WaterReport as inadecuate




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1

SenTech Corporation, 200 Innovation Blvd. Suite 236, State College, PA 16803, USA

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Department of Electrical Engineering and Materials Research Institute 217 Materials Research Lab, The Pennsylvania State University, University Park, PA 16802, USA





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Author to whom correspondence should be addressed.



Abstract A wireless, passive, remote-query sensor for monitoring sodium hypochlorite bleach solutions is reported. The sensor is comprised of a magnetically-soft ferromagnetic ribbon, coated with a layer of polyurethane and alumina, having a large and nonlinear permeability that supports higher-order harmonics in response to a time varying magnetic field. The hypochlorite ions induce swelling in the coating, with the resultant stress altering the harmonic signature of the sensor from which the sodium hypochlorite concentration can be determined. The wireless, passive nature of the sensor platform enables long-term monitoring of bleach concentrations in the environment. The sensor platform can be extended to other chemical analytes of interest as desired. View Full-Text

Keywords: Wireless sensor; passive; bleach; chlorine; higher-order harmonics Wireless sensor; passive; bleach; chlorine; higher-order harmonics





Author: Keat G. Ong 1, Maggie Paulose 1 and Craig A. Grimes 2,*

Source: http://mdpi.com/



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