Second harmonic imaging transducers
First Claim
Patent Images
1. A piezoelectric transducer, being operative at two distinct frequencies, comprising:
- a piezoelectric arrangement, having a first and a second electrode, including,a series of N piezoelectric layers extending from the first to the second electrode, anda plurality of interleaving electrodes, each of which is located between adjacent piezoelectric layers;
a transceiving line, electrically connected to the piezoelectric arrangement, to at least one of the plurality of interleaving electrodes; and
two diodes, connected in parallel with opposite polarity between the first electrode and ground, being operative to switch between the two distinct frequencies.
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Abstract
A harmonic imaging transducer is a structure of two mechanically coupled piezoelectric layers. This two-layer piezoelectric structure may vibrate either in a symmetric mode, wherein the two layers are expanding and contracting in unison, or in an anti-symmetric mode, wherein one layer is contracting while the other is expanding. Symmetric mode vibrations result in first harmonic operation, while anti-symmetric mode vibrations result in second harmonic operation.
82 Citations
8 Claims
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1. A piezoelectric transducer, being operative at two distinct frequencies, comprising:
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a piezoelectric arrangement, having a first and a second electrode, including, a series of N piezoelectric layers extending from the first to the second electrode, and a plurality of interleaving electrodes, each of which is located between adjacent piezoelectric layers; a transceiving line, electrically connected to the piezoelectric arrangement, to at least one of the plurality of interleaving electrodes; and two diodes, connected in parallel with opposite polarity between the first electrode and ground, being operative to switch between the two distinct frequencies.
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2. A piezoelectric transducer, being operative at two distinct frequencies, comprising:
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a piezoelectric arrangement, having a first and a second electrode, including, a series of N piezoelectric layers extending from the first to the second electrode, and a plurality of interleaving electrodes each of which is located between adjacent piezoelectric layers, at least one of the plurality being connected to ground; a transceiving line, being electrically connected to the second electrode; and two diodes, connected in parallel with opposite polarity between the first and the second electrodes, being operative to switch between the two distinct frequencies. - View Dependent Claims (3)
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4. A piezoelectric transducer, being operative at two distinct frequencies, comprising:
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a piezoelectric arrangements having a first and a second electrode electrically connected to ground, comprising, a series of N piezoelectric layers extending from the first to the second electrode, a plurality of interleaving electrodes, each of which is located between adjacent piezoelectric layers, and, an electrically insulating layer between two adjacent interleaving electrodes; a transceiving line, being electrically connected to one of the two adjacent interleaving electrodes; two diodes connected with opposite polarity, being operative to switch between the two distinct frequencies, electrically connected to the piezoelectric arrangement.
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5. A piezoelectric transducer, being operative at two distinct frequencies, comprising:
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a piezoelectric arrangement, having a first and a second electrode electrically connected to ground, including; a series of N piezoelectric layers extending from the first to the second electrode, a plurality of interleaving electrodes, each of which is located between adjacent piezoelectric layers, a semi-conductive layer forming an array of diode pairs between two adjacent interleaving electrodes, each pair of diodes being connected parallel with opposite polarity; a transceiving line being connected to one of the two adjacent interleaving electrodes; and wherein the array of diodes is operative to switch between the two distinct frequencies, electrically connected to the piezoelectric arrangement.
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6. A piezoelectric transducer, being operative at two distinct frequencies, comprising:
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a piezoelectric arrangement, having a first and a second electrode including; a series of N piezoelectric layers extending from the first to the second electrode, and a plurality of interleaving electrodes, each of which is located between adjacent piezoelectric layers; a transceiving line electrically connected to the piezoelectric arrangement; a first switch, being operative to switch between the two distinct frequencies, electrically connected to the piezoelectric arrangement; and a transformer having a first winding, a second winding, and a center tap, connecting to the piezoelectric arrangement, being operative to increase the frequency selectivity. - View Dependent Claims (7, 8)
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Specification