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A wireless, remote query magnetoelastic CO2 sensor | ISweek - Industry sourcing
This paper presents a wireless, passive, remote query CO2 sensor comprising a ribbon-
like magnetoelastic thick-film coated with a mass-changing CO2 responsive polymer
synthesized from acrylamide and isooctylacrylate.
In response to a magnetic field impulse, the magnetostrictive magnetoelastic sensor
vibrates at a characteristic resonant frequency that is inversely dependent upon the mass
of the attached CO2 responsive polymer. The mechanical vibrations of the
magnetostrictive sensor launch magnetic flux, which can be detected remotely using a
pickup coil.
By monitoring the resonant frequency of the passive sensor, the atmospheric CO2
concentration can be determined without the need for physical connections to the sensor
or specific alignment requirements.
The effect of humidity and the CO2 responsive copolymer composition on the
measurement sensitivity are reported. Greatest sensitivity is achieved with a polymer
comprising a 1:1 mole ratio of acrylamide to isooctyl acrylate. A 0.7% change in
atmospheric CO2 concentration can be detected for a 20 microns thick polymer coated
sensor.
ISweek(http://www.isweek.com/)- Industry sourcing & Wholesale industrial products

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A wireless, remote query magnetoelastic co2 sensor

  • 1. A wireless, remote query magnetoelastic CO2 sensor | ISweek - Industry sourcing This paper presents a wireless, passive, remote query CO2 sensor comprising a ribbon- like magnetoelastic thick-film coated with a mass-changing CO2 responsive polymer synthesized from acrylamide and isooctylacrylate. In response to a magnetic field impulse, the magnetostrictive magnetoelastic sensor vibrates at a characteristic resonant frequency that is inversely dependent upon the mass of the attached CO2 responsive polymer. The mechanical vibrations of the magnetostrictive sensor launch magnetic flux, which can be detected remotely using a pickup coil. By monitoring the resonant frequency of the passive sensor, the atmospheric CO2 concentration can be determined without the need for physical connections to the sensor or specific alignment requirements. The effect of humidity and the CO2 responsive copolymer composition on the measurement sensitivity are reported. Greatest sensitivity is achieved with a polymer comprising a 1:1 mole ratio of acrylamide to isooctyl acrylate. A 0.7% change in atmospheric CO2 concentration can be detected for a 20 microns thick polymer coated sensor. ISweek(http://www.isweek.com/)- Industry sourcing & Wholesale industrial products