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Piezoelectric and ferroelectric devices

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  • 1980 [5]

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Generation and detection of short-duration unipolar stress pulses using poled PVF2 films
Author(s): S. Kovnovich, E. Harnik
Source: Electronics Letters, Volume 16, Issue 20, September 1980, p. 776 - 777
Type: Article
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The use of poled PVF2 films for the generation and detection of short-duration stress pulses is described and discussed. The method is very simple and is in particular suitable for the fabrication of very high-resolution ultrasonic probes.

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Charge-coupled devices for use in electronically-focused ultrasonic imaging systems
Author(s): J.D. Shott, R.D. Melen, J.D. Meindl
Source: IEE Proceedings F (Communications, Radar and Signal Processing), Volume 127, Issue 2, 1980 , p. 144 - 154
Type: Article
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Pulse-echo ultrasonic imaging techniques make possible the dynamic visualisation and characterisation of many soft-tissue structures with no known patient risk; however, the extraction of this information requires an ultrasonic imaging system capable of producing a high-resolution image over a sizeable field of view in real time. This paper describes the development of the cascade charge-coupled device (C3D) designed specifically for electronically-focused ultrasonic imaging systems. The C3D lens described here further enhances the desirability of such systems because the delay-line hardware needed to focus and beam steer a linear array of piezoelectric transducers is reduced to a single l.s.i. device, and because clock-frequency control does not require individual control signals for each transducer channel and therefore greatly limits the amount of external circuitry necessary to support the imaging system. The analysis of the fundamental limits of the C3D approach to ultrasonic imaging includes the effects of the asynchronous transfer of charge between sections operating at different clock frequencies, with emphasis on the impact of this process on the time-delay accuracy of the C3D lens and on the maximum level of sidelobe suppression. The first-generation C3D lens has been fabricated and tested in a static water tank. These measurements indicate that the lens produces near-theoretical lateral resolution as predicted by the aperture theory of linear arrays. Based on preliminary results, a second-generation device is proposed whose additional capabilities would include full interpolation of the field of view for a scan-line-free image presentation and on-chip apodisation to obtain higher degrees of sidelobe suppression.

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PVF2 tranducers for Rayleigh waves
Author(s): F. Mattiocco, E. Dieulesaint, D. Royer
Source: Electronics Letters, Volume 16, Issue 7, March 1980, p. 250 - 251
Type: Article
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PVF2 thin-film transducers have been incorporated in a 8 MHz s.a.w. delay line. The flexibility of the transducer material will allow its use on curved as well as plane surfaces. Losses at frequencies typical in n.d.t. applications are in principle relatively low; it is for such tasks that the use of PVF2 s.a.w. transducers is seen as particularly appropriate.

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Erratum: Combined triple-transit and bulk-wave suppression in s.a.w. delay line
Author(s): D.J. Gunton
Source: Electronics Letters, Volume 16, Issue 6, March 1980, p. 240 - 240
Type: Article
Combined triple-transit and bulk-wave suppression in s.a.w. delay line
Author(s): D.J. Gunton
Source: Electronics Letters, Volume 16, Issue 4, February 1980, p. 149 - 150
Type: Article
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The use of 3 dB hybrid power dividers/combiners at the input and output of a pair of surface-acoustic-wave delay lines can give combined suppression of triple-transit signals and bulk-wave responses. Typically, the triple-transit signal is reduced by 20 dB and the bulk-wave responses by 15 dB compared with an unmodified delay line.

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