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

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

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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 coffret 6 mini princesse disney 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 nightstick twm-850xl 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.