Micro-machined acoustic wave accelerometer
First Claim
1. An acceleration sensing apparatus, comprising:
- a piezoelectric substrate that functions as a propagation medium;
a diaphragm configured upon said substrate, wherein said diaphragm is etched to form at least one etched cavity thereof; and
a plurality of sensing elements formed on said diaphragm, wherein a first sensing element among said plurality of sensing elements is located on a top of said diaphragm, a second sensing element among said plurality of sensing elements is located on a side of said diaphragm, and a third sensing element among said plurality of sensing elements is located at a crystallography different orientation with respect to said first and second sensing elements, such that said substrate, said diaphragm and said plurality of sensing elements comprise a micro-machined acceleration sensing apparatus thereof that is clamped at one end of said substrate to an object under an acceleration and submitted to a force at said free end of said substrate to provide signals indicative of acceleration.
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Abstract
A micro-machined acceleration sensing apparatus includes a piezoelectric substrate that functions as a propagation medium. A diaphragm is configured upon the substrate, wherein the diaphragm is etched to form one or more etched cavities. Sensing elements are formed on the diaphragm, wherein a first sensing element among the sensing elements is located on a top of the diaphragm, a second sensing element among the sensing elements is located on a side of the diaphragm, and a third sensing element among the sensing elements is located at a crystallography different orientation with respect to the first and second sensing elements, such that the substrate, the diaphragm and the plurality of sensing elements comprise a micro-machined acceleration sensing apparatus thereof that is clamped at one end of the substrate to an object under an acceleration and submitted to a force at the free end of the substrate to provide signals indicative of acceleration.
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Citations
21 Claims
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1. An acceleration sensing apparatus, comprising:
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a piezoelectric substrate that functions as a propagation medium;
a diaphragm configured upon said substrate, wherein said diaphragm is etched to form at least one etched cavity thereof; and
a plurality of sensing elements formed on said diaphragm, wherein a first sensing element among said plurality of sensing elements is located on a top of said diaphragm, a second sensing element among said plurality of sensing elements is located on a side of said diaphragm, and a third sensing element among said plurality of sensing elements is located at a crystallography different orientation with respect to said first and second sensing elements, such that said substrate, said diaphragm and said plurality of sensing elements comprise a micro-machined acceleration sensing apparatus thereof that is clamped at one end of said substrate to an object under an acceleration and submitted to a force at said free end of said substrate to provide signals indicative of acceleration. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An acceleration sensing apparatus, comprising:
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a piezoelectric substrate that functions as a propagation medium;
a micromachined mass configured upon said substrate, wherein said micromachined mass is etched to form at least one etched cavity thereof; and
a plurality of sensing elements formed on said micromachined mass, wherein a first sensing element among said plurality of sensing elements is located on a top of said micromachined mass, a second sensing element among said plurality of sensing elements is located on a side of said micromachined mass, and a third sensing element among said plurality of sensing elements is located at a crystallography different orientation with respect to said first and second sensing elements, such that said substrate, said micromachined mass and said plurality of sensing elements comprise a micro-machined acceleration sensing apparatus thereof that is clamped at one end of said substrate to an object under an acceleration and submitted to a force at said free end of said substrate to provide signals indicative of acceleration. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A method for forming a micro-machined acceleration sensing apparatus, comprising:
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providing a piezoelectric substrate that functions as a propagation medium;
configuring a diaphragm configured upon said substrate, wherein said diaphragm is etched to form at least one etched cavity thereof; and
forming a plurality of sensing elements formed on said diaphragm, wherein a first sensing element among said plurality of sensing elements is located on a top of said diaphragm, a second sensing element among said plurality of sensing elements is located on a side of said diaphragm, and a third sensing element among said plurality of sensing elements is located at a crystallography different orientation with respect to said first and second sensing elements, such that said substrate, said diaphragm and said plurality of sensing elements comprise a micro-machined acceleration sensing apparatus thereof that is clamped at one end of said substrate to an object under an acceleration and submitted to a force at said free end of said substrate to provide signals indicative of acceleration. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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Specification