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US 9,541,657 B2Granted
Method of controlled pulse driving of a stacked PZT bender bar for dipole acoustic radiation
AssigneeHalliburton Energy Services, Inc.
InventorsBatakrishna Mandal, Chen Li
Life of this patent
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Abstract
A bender bar is presented. The bender bar includes at least two pairs of piezoelectric elements arranged on an inert element to adjust the response frequency of the bender bar. In some embodiments, the piezoelectric elements can be stacked on the inert element. In some embodiments, the piezoelectric elements are symmetrically arranged with respect to the bender bar such that a gap is formed between piezoelectric elements arranged on the inert element.
Claims12
A bender bar, comprising:
- an inert element having a length, width and thickness, the inert element further having a first side and a second side;
- a first pair of piezoelectric elements, wherein one of the first pair of piezeoelectric elements is bonded to the first side and one of the first pair of piezoelectric elements is bonded to the second side;
- a second pair of piezoelectric elements, wherein each of the piezoelectric elements of the second pair are bonded to one of the piezoelectric elements of the first pair;
- wherein one of the piezoelectric elements of the second pair is bonded to the first side of the inert element in relation to one of the first pair in such a way that a first gap is formed between the piezoelectric element of the first pair and the piezoelectric element of the second pair;
- wherein one of the piezoelectric elements of the second pair is bonded to the second side of the inert element in relation to one of the first pair in such a way that a second gap is formed between the piezoelectric element of the first pair and the piezoelectric element of the second pair;
- a third pair of piezoelectric elements, each of the third pair of piezoelectric elements being bonded to one of the first pair of piezoelectric elements;
- a fourth pair of piezoelectric elements, each of the fourth pair of piezoelectric elements being bonded to one of the second pair of piezoelectric elements such that the first gap and the second gap are maintained;
- a driver circuit coupled to each pair of piezoelectric elements to independently drive each of the pair;
- wherein the first pair of piezoelectric elements are bars of width less than or equal to the width of the inert element and a length less than or equal to the length of the inert element;
- and
- wherein the second pair of piezoelectric elements are bars of width less than or equal to the width of the piezoelectric elements of the first pair and length less than the length of the piezoelectric elements of the first pair.
8 more elements
A method of adjusting a frequency response of a bender bar, comprising:
- arranging a first and second pair of piezoelectric elements on an inert element having a length, width, and thickness, the inert element further having a first side and a second side;
- attaching one of the first pair of piezoelectric elements on the first side and attaching one of the first pair of piezoelectric elements on the second side;
- attaching each of the second pair of piezoelectric elements to one of the first pair of piezoelectric elements;
- and
- independently applying driving voltages to the first and second pairs of piezoelectric elements;
- wherein one of the piezoelectric elements of the second pair is bonded to the first side of the inert element in relation to one of the first pair in such a way that a first gap is formed between the piezoelectric element of the first pair and the piezoelectric element of the second pair;
- wherein one of the piezoelectric elements of the second air is bonded to the second side of the inert element in relation to one of the first air in such a way that a second is formed between the piezoelectric element of the first pair and the piezoelectric element of the second pair;
- attaching a third pair of piezoelectric elements, each of the third pair of piezoelectric elements being bonded to one of the first pair of piezoelectric elements;
- attaching a fourth pair of piezoelectric elements, each of the fourth pair of piezoelectric elements being bonded to one of the second pair of piezoelectric elements such that the first gap and the second gap are maintained;
- and
- wherein the second pair of piezoelectric elements are bars of width less than or equal to a width of the piezoelectric elements of the first pair and length less than a length of the piezoelectric elements of the first pair.
8 more elements
Dependencies are inferred from the claim text.