Electromagnetic piezoelectric acoustic sensor
First Claim
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1. An acoustic sensor comprising:
- at least one resonant element;
a driver comprising an electrical coupling means and an electromagnetic field source, arranged such that, in use, the electrical coupling means transfers current to the electromagnetic field source which produces an electromagnetic field that wirelessly drives the at least one resonant element, with matching resonances of the electromagnetic field source and the at least one resonance element, to produce acoustic waves directed to a predetermined part of a test sample, said electrical coupling means comprising a multiply resonant coaxial transmission line;
an electromagnetic detector arranged to receive, in use, the acoustic spectrum emitted from the test sample after the acoustic waves have interacted with the test sample; and
an electrical circuit connected to the driver and electromagnetic detector, the circuit arranged, in use, to provide the current and to detect, in combination with the electromagnetic detector, the acoustic spectrum received by the electromagnetic detector.
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Abstract
An acoustic sensor comprises at least one resonant element. A driver comprises an electrical coupling means and an electromagnetic field source arranged such that the electrical coupling means transfers currents to the electromagnetic field source. The electromagnetic field source produces an electromagnetic field that drives the resonant elements to produce acoustic waves directed to a predetermined part of a test sample. Also provided is an electromagnetic detector for receiving the acoustic spectrum omitted from a test sample and an electrical circuit connected to the drive around detector.
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Citations
33 Claims
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1. An acoustic sensor comprising:
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at least one resonant element; a driver comprising an electrical coupling means and an electromagnetic field source, arranged such that, in use, the electrical coupling means transfers current to the electromagnetic field source which produces an electromagnetic field that wirelessly drives the at least one resonant element, with matching resonances of the electromagnetic field source and the at least one resonance element, to produce acoustic waves directed to a predetermined part of a test sample, said electrical coupling means comprising a multiply resonant coaxial transmission line; an electromagnetic detector arranged to receive, in use, the acoustic spectrum emitted from the test sample after the acoustic waves have interacted with the test sample; and an electrical circuit connected to the driver and electromagnetic detector, the circuit arranged, in use, to provide the current and to detect, in combination with the electromagnetic detector, the acoustic spectrum received by the electromagnetic detector. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A method for use in acoustic sensing, the method comprising the steps of:
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applying a current to a multiply resonant coaxial transmission line; transferring current from the multiply resonant coaxial transmission line to an electromagnetic field source; wirelessly driving, with an electromagnetic field produced by the electromagnetic field source, at least one resonant element to produce acoustic waves directed to a predetermined part of a test sample, resonances of the electromagnetic field being matched with resonance of said acoustic waves; and detecting with an electrical circuit connected to the electromagnetic field source together with an electromagnetic detector and the electrical coupling means, an acoustic spectrum produced after the acoustic waves have interacted with the test sample. - View Dependent Claims (30, 31, 32, 33)
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Specification