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In the present contribution femur (leg bone) tissue excised from calves was investigated in vitro by electrical impedance spectroscopy in a frequency range of 40Hz-40MHz. Three different equivalent electrical circuits were tested for suitable representation of the measured data, where the fitting was performed by a complex nonlinear least-square algorithm. Finally, a depth profile of a bone sample...
Electromagnetic excitation of acoustic resonators sensors as an alternative to piezoelectric and capacitive acoustic sensors provides unique benefits of remote, multi-mode measurements. Utilizing out-of-plane modes of vibration, we have employed the devices as liquid level sensors. The resolution is not limited by the wavelength (as for time-of-flight ultrasonic sensors), since small frequency changes...
In order to optimize the design of piezoelectric thickness-shear-mode (TSM) liquid sensors, it is essential to understand the complete interaction between the resonator and the liquid. For instance, a major issue is the excitation of spurious, scarcely damped compressional waves, which can lead to disturbing interferences when reflected by nearby obstacles. Earlier attempts to model this effect include...
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