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Sensors 2003, 3(1), 11-18; doi:10.3390/s30100011

A Wireless, Passive, Magnetically-soft Harmonic Sensor for Monitoring Sodium Hypochlorite Concentrations in Water

1
SenTech Corporation, 200 Innovation Blvd. Suite 236, State College, PA 16803, USA
2
Department of Electrical Engineering and Materials Research Institute 217 Materials Research Lab, The Pennsylvania State University, University Park, PA 16802, USA
*
Author to whom correspondence should be addressed.
Received: 20 November 2002 / Accepted: 5 December 2002 / Published: 25 January 2003
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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.
Keywords: Wireless sensor; passive; bleach; chlorine; higher-order harmonics Wireless sensor; passive; bleach; chlorine; higher-order harmonics
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Ong, K.G.; Paulose, M.; Grimes, C.A. A Wireless, Passive, Magnetically-soft Harmonic Sensor for Monitoring Sodium Hypochlorite Concentrations in Water. Sensors 2003, 3, 11-18.

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