Electricity: measuring and testing – Magnetic – Magnetometers
Patent
1995-06-19
1997-10-07
O'Shea, Sandra L.
Electricity: measuring and testing
Magnetic
Magnetometers
324209, 7386269, G01R 3302
Patent
active
056752520
ABSTRACT:
A piezomagnetometer uses a magnetoelectric composite structure, formed by alternating layers of piezoelectric and magnetostrictive material, to convert a fluctuating magnetic field directly to electric current. Strain in the magnetostrictive layers, coming from an ambient magnetic field, stresses piezoelectric layers and drives a polarization current proportional to amplitude of the ambient field. Electrically, the composite is a current source connected in parallel with a capacitor. Its simple and direct operation and solid state sensor enables constructing a small, rugged, inexpensive magnetometer that operates at an ambient temperature with high sensitivity at low power. Multiple piezomagnetometers can be incorporated into a practical detection system capable of operating at ambient temperatures and meeting the limitations presented in civilian and military operations.
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Creighton Wray James
O'Shea Sandra L.
Patidar Jay M.
SQM Technology, Inc.
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