US 9,435,821 B1 · Single-axis accelerometer

Abstract

A single-axis accelerometer includes a housing defining a sleeve. An object/mass is disposed in the sleeve for sliding movement therein in a direction aligned with the sleeve's longitudinal axis. A first piezoelectric strip, attached to a first side of the object and to the housing, is longitudinally aligned with the sleeve's longitudinal axis. The first piezoelectric strip includes a first strip of a piezoelectric material with carbon nanotubes substantially aligned along a length thereof. A second piezoelectric strip, attached to a second side of the object and to the housing, is longitudinally aligned with the sleeve's longitudinal axis. The second piezoelectric strip includes a second strip of the piezoelectric material with carbon nanotubes substantially aligned along a length thereof. A voltage sensor is electrically coupled to at least one of the first and second piezoelectric strips.

Claims15

Dependent claims

A single-axis accelerometer, comprising:

a housing defining a sleeve having a longitudinal axis;
an object having a mass disposed in said sleeve for sliding movement therein in a direction aligned with said longitudinal axis;
a first piezoelectric strip attached to a first side of said object and attached to said housing, said first piezoelectric strip longitudinally aligned with said longitudinal axis, said first piezoelectric strip including a first strip of a piezoelectric material with carbon nanotubes substantially aligned along a length of said first strip;
a second piezoelectric strip attached to a second side of said object and attached to said housing, said second side opposing said first side, said second piezoelectric strip longitudinally aligned with said longitudinal axis, said second piezoelectric strip including a second strip of said piezoelectric material with carbon nanotubes substantially aligned along a length of said second strip;
and
a voltage sensor electrically coupled to at least one of said first piezoelectric strip and said second piezoelectric strip.

3 more elements

A single-axis accelerometer, comprising:

a housing defining a sleeve having a longitudinal axis;
an object having a mass disposed in and constrained by said sleeve for sliding movement therein only in a direction aligned with said longitudinal axis, wherein air spaces are defined in said sleeve on opposing sides of said object;
a first piezoelectric strip attached to a first of said opposing sides of said object and attached to said housing, said first piezoelectric strip disposed in one of said air spaces and longitudinally aligned with said longitudinal axis, said first piezoelectric strip including a first strip of a piezoelectric material with carbon nanotubes embedded in and substantially aligned along a length of said first strip, said carbon nanotubes occupying approximately 30-50 volume percent of said first piezoelectric strip;
a second piezoelectric strip attached to a second of said opposing sides of said object and attached to said housing, said second piezoelectric strip disposed in another of said air spaces and longitudinally aligned with said longitudinal axis, said second piezoelectric strip including a second strip of said piezoelectric material with carbon nanotubes embedded in and substantially aligned along a length of said second strip, said carbon nanotubes occupying approximately 30-50 volume percent of said second piezoelectric strip;
and
a voltage sensor electrically coupled to one of said first piezoelectric strip and said second piezoelectric strip.

3 more elements

Dependencies are inferred from the claim text.

Single-axis accelerometer

Life of this patent

Single-axis accelerometer

Life of this patent

Abstract

Claims15