A comprehensive circuit model characterization of dispersive interdigital transducers with nonuniform electrode spacing is presented. The model is an extension of a three-port circuit which has been useful for representing periodic transducers. The extended model includes the effects of strong piezoelectric coupling whereby the acoustic waves and electric circuits interact, and it also accounts...

A high accuracy switched capacitor, triple slope digital converter suitable for differential capacitive sensors is presented. The proposed technique accepts differential capacitive sensors possessing either linear or inverse characteristics and provides a linear capacitance to digital conversion. The output is dependent only on a pair of d.c. reference voltages and the clock frequency. Detailed...

Here we report the results of combined investigation of the set of imidazolium-based ILs and their mixture with acetonitrile (AN), γ-butyrolactone (γ-BL), propylene carbonate (PC) by using multitechnique approach. The following techniques were used to elucidate microscopic structure and dynamics in ILs based binary mixtures: conductometric measurements, NMR, Raman, quasi-elastic neutron scatter...

Graft polymerization of trimethoxysilyl-containing ammonium cations on negatively-charged titania nanosheets gives a photoluminescent viscoelastic nanocomposite. Proton conduction network comprised of adsorbed water molecules near the titania slabs leads to the multiple conductometric sensitivities to temperature, humidity, and photo-irradiation.

Conductometric measurements on solid lithium, sodium and potassium propanoates and X-ray powder diffraction measurements on the sodium and potassium salts have been performed over temperature ranges including solid state transitions. The temperature dependence of the transport and lattice parameters of the different crystalline phases and the changes of the same parameters in correspondence wit...

The technique in artificial ultrasonic transducer using electronics is very bulky and power hungry. We switched over to ultrasonic Micro-Electronics Mechanical Systems (MEMS) which have shown significant importance for miniaturized mechanical system, based on silicon technology. MEMS based acoustic sensing transducers commonly employ the piezo-electric technology to interpret the received ultra...