Bender bar modal shaping
First Claim
Patent Images
1. An acoustic transducer for use in a wellbore, the acoustic transducer comprising:
- an inert element; and
a ferroelectric actuation element coupled to the inert element to thereby produce acoustic forces that propagate through fluid within the wellbore, wherein the acoustic transducer was manufactured using a method comprising;
coupling driver circuitry to the ferroelectric actuation element;
selecting a mode shape of vibration of the acoustic transducer;
determining a geometric shape of the ferroelectric actuation element that, when driven by the driver circuitry, results in the ferroelectric actuation element causing the acoustic transducer to vibrate in the selected mode shape of vibration;
shaping the ferroelectric actuation element to match the geometric shape, thereby configuring the ferroelectric actuation element to couple with the selected mode shape of vibration of the acoustic transducer; and
coupling the ferroelectric actuation element to the inert element.
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Abstract
An acoustic transducer, such as a bender bar, having ferroelectric actuation elements that are designed to optimize a predetermined deflection mode shape. The acoustic transducers may include one or more rounded modally shaped actuation elements or weighted actuation elements. Modal shaping of the actuation elements allows for specific targeting of modes which most efficiently radiate acoustic energy.
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Citations
19 Claims
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1. An acoustic transducer for use in a wellbore, the acoustic transducer comprising:
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an inert element; and a ferroelectric actuation element coupled to the inert element to thereby produce acoustic forces that propagate through fluid within the wellbore, wherein the acoustic transducer was manufactured using a method comprising; coupling driver circuitry to the ferroelectric actuation element; selecting a mode shape of vibration of the acoustic transducer; determining a geometric shape of the ferroelectric actuation element that, when driven by the driver circuitry, results in the ferroelectric actuation element causing the acoustic transducer to vibrate in the selected mode shape of vibration; shaping the ferroelectric actuation element to match the geometric shape, thereby configuring the ferroelectric actuation element to couple with the selected mode shape of vibration of the acoustic transducer; and coupling the ferroelectric actuation element to the inert element. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of manufacturing an acoustic transducer, comprising:
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providing an inert element; providing a ferroelectric actuation element; coupling driver circuitry to the ferroelectric actuation element; selecting a mode shape of vibration of the acoustic transducer; determining a geometric shape of the ferroelectric actuation element that, when driven by the driver circuitry, results in the ferroelectric actuation element causing the acoustic transducer to vibrate in the selected mode shape of vibration; shaping the ferroelectric actuation element to match the geometric shape, thereby configuring the ferroelectric actuation element to couple with the selected mode shape of vibration of the acoustic transducer; and coupling the ferroelectric actuation element to the inert element. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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Specification