Method and device for determining the resonant frequency of resonant piezoelectric sensors
OwnerFerrari Vittorio, Marioli Daniele +1inventors
InventorsFerrari Vittorio, Marioli Daniele, Taroni Andrea
Life of this patent
Estimating the term…
Abstract
A method and a device are disclosed to determine the value of the resonant frequency of a resonant sensor subject to an acoustomechanical and/or dielectric load. The sensor is simultaneously and constantly excited at two different frequencies, the first of which is the series resonant frequency, while the second is introduced to detect and compensate the sensor parallel capacitance in an automatic and continuous way.
Claims22
A method to determine the value of the resonant frequency of a resonant sensor subject to an acousto-mechanical and/or dielectric load, wherein said sensor is excited by at least a first electrical signal having a first frequency, characterized in that the sensor is constantly and simultaneously excited by at least a second electrical signal having a second frequency different and independent from said first frequency so as to compensate the parallel capacitance of the sensor in an automatic and continuous way.
A device to determine the value of the resonant frequency of a resonant sensor subject to anacousto-mechanical and/or dielectric load, including at least one oscillator circuit having at least one first feedback section to excite said sensor with at least one first electrical signal having a first frequency, characterized in that at least one second feedback section is included to constantly and simultaneously excite said sensor with at least one second electrical signal having a second frequency different and independent from said first frequency so as to compensate the parallel capacitance of the sensor in anautomatic and continuous way.
Dependencies are inferred from the claim text.