Piezo sensor

Patent metadata

Field	Value
Publication number	US-10048291-B2
Application number	US-201414264451-A
Country	US
Kind code	B2
Filing date	Apr 29, 2014
Priority date	Nov 17, 2011
Publication date	Aug 14, 2018
Grant date	Aug 14, 2018

Abstract

A piezo sensor having an inner conductor having an inner conductor segment, where the inner conductor segment forms a tubular sidewall having a break, and also having an interior surface and an exterior surface; a plurality of individually polarized piezoelectric members, each having an inner face and an outer face, and each inner face contacting the first conductor exterior surface, each piezoelectric member being adjacent to another on the exterior face of the inner conductor, forming sets of adjacent faces; an outer conductor having an outer conductor segment forming a tubular sidewall having a break, the outer conductor having an interior surface and an exterior surface, where the interior surface contacts the outer face of the piezoelectric members; and where the break of the outer conductor segment is alignable with adjacent faces of two of the plurality of piezoelectric members, and further being alignable with the break of the inner conductor segment.

First claim

The invention claimed is:

1. A combination of a magnetostrictive wire and a piezo sensor, said piezo sensor comprising:
an inner conductor comprising an inner conductor segment, said inner conductor segment forming a tubular sidewall having a break, and also having an interior surface and an exterior surface;
a plurality of separate polarized piezoelectric members, each member having a polarization direction, each having an inner face and an outer face, said inner face of said polarized piezoelectric members contacting said inner conductor exterior surface, each of said plurality of piezoelectric members being adjacent another of said plurality of piezoelectric members on said exterior face of said inner conductor, thereby forming sets of adjacent faces, at least one set of said adjacent sets of adjacent surfaces forms a gap between the respective adjacent piezoelectric members of said at least one set;
an outer conductor comprising an outer conductor segment forming a tubular sidewall having a break, said outer conductor having an interior surface and an exterior surface, said interior surface of said outer conductor contacting said outer face of each of said polarized piezoelectric members, said interior surface of said outer conductor segment facing said interior surface of said inner conductor segment; said piezo sensor having a hollow center portion interior to and contacting the inner conductor surface;
said break of said outer conductor segment being alignable with said gap, and further being alignable with said break of said inner conductor segment, to thereby provide access to said hollow center portion through said aligned breaks of said outer conductor segment, said inner conductor segment and said gap; and
said magnetostrictive wire positioned in and insulated in said hollow center portion of said piezo sensor.

2. The combination of claim 1 , wherein said inner conductor is formed from at least two discrete segments, said discrete segments being electrically connected.

3. The combination of claim 1 wherein said piezo sensor, further comprises a broken outer coupling band contacting said outer conductor segment exterior surface, said broken outer coupling band adapted to apply an inward force on said outer conductor segments.

4. The combination of claim 1 wherein each of said adjacent surfaces in said adjacent sets being separated and not touching near said interior surface of said outer conductor, wherein said exterior surface of said inner conductor segment has a plurality of landing sites shaped to accommodate the inner face of said polarized piezoelectric members, and said interior face of said outer conductor segment has a plurality of landing sites shaped to accommodate said exterior face of said piezoelectric members, each of said plurality of said piezoelectric members positioned between said one of said landing sites on said outer conductor segment and one of said landing sites on said inner conductor segment.

5. The combination of claim 1 , wherein said inner conductor segment comprises a split annular ring.

6. The combination of claim 1 , wherein said broken outer coupling band comprises a broken cylindrically shaped sidewall defining an interior and an exterior, and said broken outer coupling band further comprises at least one projecting finger extending from said sidewall into said interior of said cylindrically shaped sidewall.

Assignees

• Fauveau Eric
• Abb Inc

Inventors

• Fauveau Eric

Classifications

• Y10T29/42

  Piezoelectric device making · CPC title

• H04R17/00

  Piezoelectric transducers; Electrostrictive transducers (piezoelectric or electrostrictive elements in general H10N30/00; details of piezoelectric or electrostrictive motors, generators or positioners {H10N30/00}) · CPC title

• H04R15/00 Primary

  Magnetostrictive transducers (magnetostrictive elements in general H10N30/00) · CPC title

• G01R5/28 Primary

  Electrostatic instruments · CPC title

• G01R3/00

  Apparatus or processes specially adapted for the manufacture {or maintenance} of measuring instruments {, e.g. of probe tips} · CPC title