Implementation of a Data Acquisition System for Contactless Conductivity Imaging

Abstract

A data acquisition system is realized to image electrical conductivity of biological tissues via contactless measurements. This system uses magnetic excitation to induce currents inside the body and measures the magnetic fields of the induced currents. A magnetically coupled differential coil system is scanned on the conductive object by a computer controlled scanning system. A data acquisition system is constructed using a PC controlled lock-in amplifier. 1.64V secondary voltage difference can be measured for 0.6 S/m solution. The average data acquisition time is 4.67 sec/mm2. 8 mm diameter objects with conductivity 0.2 S/m can be detected with this system.

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Document Details

Document Type
Technical Report
Publication Date
Oct 25, 2001
Accession Number
ADA410709

Entities

People

  • B. Ulker
  • N. G. Gencer

Organizations

  • Middle East Technical University

Tags

Communities of Interest

  • Biomedical

DTIC Thesaurus Topics

  • Accuracy
  • Acquisition
  • Amplifiers
  • Brushless Dc Motors
  • Computers
  • Conductivity
  • Data Acquisition
  • Detectors
  • Diagnostic Imaging
  • Electrical Conductivity
  • Electrical Impedance
  • Frequency
  • Frequency Response
  • Gray Scale
  • Magnetic Fields
  • Magnetic Flux Density
  • Measurement

Fields of Study

  • Physics

Readers

  • Computer Vision.
  • Electrical Engineering
  • Thermal Physics or Thermal Science.