Magnetostrictive stress wave sensor

Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – Magnetostrictive-type device

Reexamination Certificate

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Details

C073S862690

Reexamination Certificate

active

11490325

ABSTRACT:
A shock sensor has a housing with a Terfenol-D type sensing element positioned inside a sensing coil. A permanent biasing magnet is positioned in engagement with the Terfenol-D sensing element, and a spacer engages the Terfenol-D sensing element and extends from the housing. The housing has a beam with one or two mounting holes through which fasteners extend to mount the shock sensor to a structural member. The housing places the spacer in compression against the structural member. In an alternative embodiment a DC current can be supplied to the sensing coil to provide the biasing magnetic field. A high frequency filter separates the shock sensing signal from the applied DC biasing current.

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“Terfenol Basics”, web page printout, http//www.terfenoltruth.com/basics/, Oct. 13, 2003, 1p.
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