We discuss the analysis of a piezoelectric energy harvester for random mechanical vibrations, and we assess performance improvement guaranteed by interposing matching network between transducer electrical load, in terms average output power efficiency. The mathematical model describing is system stochastic differential equations, where both cases linear nonlinear devices are considered. In case...

pulse echo b - scan imaging systems have been used for years in medical diagnosis. the theroy of such systems have been investigated by several researchers. in this paper, we introduce a new model for b - scan imaging system based on gaussian type transducer. an imaging system is normally identified by its point response function. this function describes the image of a single physical point obj...

This work addresses the problem of compensating for differential Doppler shifts due to source motion in a time-reversal mirror. Time reversal is a feedback wave focusing technique that can be used in poorly-characterized media, and is quite appealing in bidirectional underwater communications as it allows multipath to be transparently canceled in highly dispersive channels. Under simplifying as...

In this paper is presented a novel approach for current measurement using smart materials, magnetic shape memory (MSM) alloys. Their shape change can be controlled by the application of magnetic field or mechanical stress. This gives the possibility to measure currents by correlating the magnetic field produced by the current, shape change in an MSMbased sensor and the voltage output of a Linea...

AbstractLinear variable differential transformer (LVDT) has evolved into a highly accurate and reliable form of displacement transducer and has found widespread application in industry for the measurement of displacement, force or pressure. This paper discusses the design consideration of an LVDT based digital weighing system capable of weighing up to 1000 grams (1 kilogram). Atmel 89S52 microc...