This state-of-the-art value outperforms bulk piezoelectric ceramics and composites with randomly dispersed particles, and is comparable to the values reported for the piezoelectric polymers PVDF and P(VDF-TrFE). Optimized composite films are incorporated in flexible piezoelectric touch sensors. The high sensitivity is analyzed and discussed. As the fabrication technology is straightforward and easy to implement, applications are foreseen in flexible electronics such wireless sensor networks and biodiagnostics.

Decapsulation of plastic Integrated Circuit (IC) packages is an important step in package level failure analysis. In this paper, optimization of a Microwave Induced Plasma (MIP) system for plastic IC package decapsulation is described. An improvement on the microwave coupling of the MIP system is achieved and microwave power reflection is reduced from more than 50% to less than 15%. Results on oxygen plasma etching of IC package samples showed that decapsulation by only oxygen plasma is not practical. Results on oxygen and carbontetrafluoride mixture plasma showed an etch rate of 0.55 mm 3 /min at 390°C effluent temperature. High selectivity ensured the copper wires to be intact after decapsulation. Parameters that affect plasma etching performance are discussed and results are shown to prove the high efficiency of this MIP decapsulation method.

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A filtered convolution method for the computation of acoustic wave fields in very large spatiotemporal domains J. Acoust. Soc. Am. 125, 1868 (2009) Pyroelectric properties of materials can be accurately determined by applying a new digital signal processing method on the discrete sampled data obtained with a temperature oscillation technique. The pyroelectric coefficient is calculated from the component of the generated current 90 • out of phase with respect to the sinusoidal temperature wave. The novelty of the proposed approach lies in the signal analysis procedure which implements a simple Fast Fourier transform that filters residual noise through convolution, and calculates the phase difference between the peaks of the temperature and current waves. The new idea requires relatively simple hardware and enables very accurate measurement of the pyroelectric coefficient of materials at ultra low frequencies, 1-250 mHz, without using costly lock-in amplifiers. C 2015 AIP Publishing LLC. [http://dx

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