Low-Power Giant Magneto-Impedance Magnetic Detector

Abstract

The present invention is an electrical circuit for a sensor designed to detect external magnetic fields. The circuit is composed of a stable voltage reference source, connected to a low frequency amplifier where the operating point of the amplifier depends on the voltage reference source that is biased for maximum allowable voltage swings of the amplifier. A GMT fiber is connected to the low frequency amplifier and to a crystal oscillator that generates a square wave excitation signal with which to excite the GMT fiber. A decoupling network connected to the amplifier allows stable excitation of the GMI fiber by separating the direct current paths of the amplifier from the excitation signal. When the GMT fiber is excited by the square wave signal the GMI fiber impedance varies with impressed magnetic fields, which in turn varies the output voltage of the amplifier.

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Document Details

Document Type
Technical Report
Publication Date
Jun 26, 2006
Accession Number
ADD020260

Entities

People

  • James D. Hagerty

Organizations

  • United States Department of the Navy

Tags

Communities of Interest

  • Advanced Electronics
  • Sensors

DTIC Thesaurus Topics

  • Amplifiers
  • Circuits
  • Crystal Oscillators
  • Detectors
  • Direct Current
  • Electrical Circuits
  • Frequency
  • Impedance
  • Inventions
  • Magnetic Detectors
  • Magnetic Fields
  • Networks
  • Oscillators
  • Radio Frequency
  • Square Waves
  • Voltage
  • Waves

Fields of Study

  • Physics

Readers

  • Integrated Circuit Design and Technology.
  • Optical Fiber Sensing and Electromagnetic Propagation.
  • Plasma Physics / Magnetohydrodynamics