An array of piezoelectric micro actuators can be used for radiation of an ultrasonic carrier signal modulated in amplitude with an acoustic signal, which yields audio frequency applications as the air acts as a self-demodulating medium. This application is known as the parametric array. We propose a parametric array with array elements based on existing piezoelectric micro ultrasonic transducer...

Ultrasonic ranging is the most common method used in robotic systems for distance or proximity sensing. The heart of the method is an ultrasonic transducer that emits and detects ultrasound. There are mainly two types of transducers existing in the market today; piezoelectric and electrostatic. In this paper, we propose the use of a new type of transducer, which is capacitive micromachined ultr...

This work presents the design, construction and characterization of air-coupled piezoelectric transducers using 1-3 connectivity piezocomposite disks with a stack of matching layers being the outer one an active quarter wavelength layer made of polypropylene foam ferroelectret film. This kind of material has shown a stable piezoelectric response together with a very low acoustic impedance (<0.1...

Piezoelectric sensors have emerged as a versatile tool for measurement of various quantities such as pressure, acceleration, strain, or force across many industrial applications. When mechanically strained, electric charges are produced inside a piezoelectric transducer. These charges result in an electric field that may be measured as a voltage difference between two electrodes, from which the...

Underwater acoustic signals need transducers to generate and detect signals with high power, linearity, dynamic-range and beamwidth. Among a variety of transducer designs, a Tonpilz transducer stands out for power and long-range applications. A Tonpilz transducer for underwater acoustic signaling is developed to scale and analyzed using FEM tools with Comsol. The underlying pressure-acoustics a...

A “capacitive-piezo” transducer that combines the strengths of capacitive and piezoelectric mechanisms to achieve an impedance and Q simultaneously lower and higher, respectively, than otherwise attainable by either mechanism separately, has allowed demonstration of a 1.2-GHz contour-mode AlN ring resonator with a motional resistance of 889 Ω and Q=3,073 higher than so far measured for any othe...

The fabrication of a fully printed, lead-free, polymer piezoelectric transducer is presented and the characterization its structural, dielectric, ferroelectric properties at different processing stages demonstrated. performance poly(vinylidene fluoride-trifluoroethylene) transducers with resonance frequency analyses, acoustic power measurements, pulse-echo experiments evaluated. Notably, for fi...

Partial discharge (PD) is the main cause of electric equipment degradation. PD location can provide the scientific direction and analysis for equipment condition monitoring. The phased-ultrasonic receiving-planar array transducer for PD location in transformer is studied in this paper. The operation environment and material properties of transducer are analyzed. The center frequency of transduc...

In this contribution, we propose an experimentally validated system-level model of a magnetoelectric transducer and general methodology for future characterization similar transducers. This provides insights into the main origin power losses. An analogy with piezoelectric generators leads to figure merit which is strongly impacted by nonlinear behavior transducer. Considering complexity observe...