Showing papers on "Piezoelectric sensor published in 1972"
Patent•
05 Jul 1972TL;DR: In this article, a pressure wave sensor is formed of at least one elongated piezoelectric element having two faces, each associated to a flexible conducting electrode substantially over the whole length of the sensitive element.
Abstract: Pressure wave sensor formed of at least one elongated piezoelectric element having two faces, each associated to a flexible conducting electrode substantially over the whole length of the sensitive element. When the sensor is formed of a plurality of sensitive elements the latter are electrically connected to one another.
64 citations
Patent•
12 Dec 1972
TL;DR: In this article, a noise-making device using a piezoelectric transducer is described, which includes a metal crystal, first and second electrode means carried by the crystal, and dividing one of the electrode means into electrically isolated areas so as to provide a third electrode means.
Abstract: A noise making device, using a piezoelectric transducer, includes a piezoelectric element mechanically coupled to a substrate and an electrical circuit for energizing the transducer. The piezoelectric element includes a piezoelectric crystal, first and second electrode means carried by the crystal, and means dividing one of the electrode means into electrically isolated areas so as to provide a third electrode means.
34 citations
TL;DR: In this article, a three element piezoelectric microparticle impact sensing diaphragm is described which is sensitive to the detection of momentum propagated by the bending wave.
Abstract: The design of a three element piezoelectric microparticle impact sensing diaphragm is described which is sensitive to the detection of momentum propagated by the bending wave. The design achieves a sensitivity of .03 microdyn/sec and optimizes the detection of the direct-path pulse from impact relative to secondary reflections and interference from discontinuities. Measurement of the relative arrival times and the maximum amplitudes of the outputs from the three piezoelectric sensors leads to the determination of the impact position and the normally resolved impact momentum exchange. Coincidence of the signals and a partial redundancy of data leads to a very high noise discrimination.
5 citations
TL;DR: In this paper, the effect of Teflon cables on both uniaxial and torsional strain was investigated. And the effect was shown to be 2-3 orders of magnitude smaller than those of good piezoelectric materials.
Abstract: Preliminary measurements of the piezoelectric effect in commercially produced Teflon cables have been performed using simple static methods. The effective piezoelectric constants for both uniaxial strain and torsional strain were determined. The effect, though 2–3 orders of magnitude smaller than those of good piezoelectric materials, is potentially useful as the basis of inexpensive but sensitive strain transducers.
4 citations
TL;DR: In this paper, a two-dimensional ferroelectric memory array can be read out nondestructively by sensing the piezoelectric response of the individual bits in the array.
Abstract: The information stored in a two-dimensional ferroelectric memory array can be read out nondestructively by sensing the piezoelectric response of the individual bits. This piezoelectric response is studied experinlentally for an individual bit that is electrically isolated from, but elastically coupled to. the rest of the array. Results show the presence of travelling acoustic waves that produce transient word-to-word piezoelectric coupling as well as static coupling between adjacent words due to the strain component parallel to the word electrodes. The electrical noise resulting from these interactions produces both a time shift (-2 pec) and an amplitude change 15 %) in the readout signal from a bit in a complete array. Variations in readout signal with temperature and input amplitude are also presented.