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  • Title: Remote query measurement of pressure, fluid-flow velocity, and humidity using magnetoelastic thick-film sensors.
    Author: Grimes CA, Kouzoudis D.
    Journal: Sens Actuators A Phys; 2000 Sep 01; 84(3):205-12. PubMed ID: 12143886.
    Abstract:
    Free-standing magnetoelastic thick-film sensors have a characteristic resonant frequency that can be determined by monitoring the magnetic flux emitted from the sensor in response to a time varying magnetic field. This property allows the sensors to be monitored remotely without the use of direct physical connections, such as wires, enabling measurement of environmental parameters from within sealed, opaque containers. In this work, we report on application of magnetoelastic sensors to measurement of atmospheric pressure, fluid-flow velocity, temperature, and mass load. Mass loading effects are demonstrated by fabrication of a remote query humidity sensor, made by coating the magnetoelastic thick film with a thin layer of solgel deposited Al2O3 that reversibly changes mass in response to humidity.
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