PIEZOELECTRIC ACCELEROMETER
First Claim
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1. A piezoelectric accelerometer comprising:
- a monolithic block of a ceramic piezoelectric material, said block having an outer surface;
an electrostatic screening means coating the outer surface said monoliThic block;
said block being provided with hollows dividing the block into parts, one part of said block serving as an inertial mass;
another part of said block serving as a foundation;
a third part of said block arranged between the first two said parts and serving as at least one piezoelectric element;
said hollows thereby dividing the monolithic block into said inertial mass, piezoelectric element and foundation; and
electrodes for said piezoelectric element accommodated in said hollows.
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Abstract
A piezoelectric accelerometer with electrostatic screening having at least one piezoelectric element with electrodes provided between the inertial mass and the foundation. Said accelerometer is fashioned as a single monolithic block made of a piezoelectric material divided, by hollows, into regions serving as the foundation, piezoelectric element, and inertial mass, said hollows accomodating electrodes therein.
15 Citations
6 Claims
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1. A piezoelectric accelerometer comprising:
- a monolithic block of a ceramic piezoelectric material, said block having an outer surface;
an electrostatic screening means coating the outer surface said monoliThic block;
said block being provided with hollows dividing the block into parts, one part of said block serving as an inertial mass;
another part of said block serving as a foundation;
a third part of said block arranged between the first two said parts and serving as at least one piezoelectric element;
said hollows thereby dividing the monolithic block into said inertial mass, piezoelectric element and foundation; and
electrodes for said piezoelectric element accommodated in said hollows.
- a monolithic block of a ceramic piezoelectric material, said block having an outer surface;
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2. A piezoelectric accelerometer according to claim 1, wherein said block has a longitudinal axis and said hollows are arranged symmetrically about the longitudinal axis of said monolithic block to provide measurements of accelerations acting along said axis.
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3. A piezoelectric accelerometer according to claim 2, wherein said hollows are shaped as cylinders, said cylinders being divided into first and second equal groups;
- said first group of cylinders having longitudinal axes extending in a plane normal to the longitudinal axis of said monolithic block and being disposed radially with respect thereto;
said second group of cylinders having longitudinal axes extending in another plane normal to the longitudinal axis of said monolithic block and being disposed radially with respect thereto;
said planes being spaced apart to a distance corresponding to the height of said piezoelectric element.
- said first group of cylinders having longitudinal axes extending in a plane normal to the longitudinal axis of said monolithic block and being disposed radially with respect thereto;
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4. A piezoelectric accelerometer according to claim 2 wherein said hollows are wedge-shaped and have end faces defined by two planes parallel with respect to each other and normal to the longitudinal axis of said monolithic block;
- said wedge-shaped hollows having side surfaces defined by two intersecting planes with the line of intersection thereof extending in parallel with the longitudinal axis of said monolithic block;
said end faces in each of said wedge-shaped hollows being spaced apart to a distance corresponding to the height of said piezoelectric element;
the side surfaces of adjacent of the wedge-shaped hollows being spaced apart to a distance corresponding to the thickness of said piezoelectric element.
- said wedge-shaped hollows having side surfaces defined by two intersecting planes with the line of intersection thereof extending in parallel with the longitudinal axis of said monolithic block;
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5. A piezoelectric accelerometer according to claim 2, wherein said hollows are shaped as inner and outer cylinders coaxial with respect to the longitudinal axis of said monolithic block;
- said inner cylinder having a bottom, side and open end;
the said outer cylinder having a bottom disposed at the side of said outer cylinder and arranged close to the open end of said inner cylinder;
said inner and outer cylinders having side surfaces with the piezoelectric element accomodated therebetween.
- said inner cylinder having a bottom, side and open end;
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6. A piezoelectric accelerometer according to claim 2 wherein said electrodes comprises a current conducting coating in said hollows.
Specification