Electrical impedance spectroscopy is a widely recognised, non-destructive method for examining the properties of different materials and objects.

Quadra impedance mapping technology is the result of 40 years of research by Eliko and the Tallinn University of Technology. The platform enables fast, real-time detection of changes in any object with electrical properties.

The compact impedance-mapping technology can be used for creating portable connected devices or large-scale measurement systems. Quadra has validated applications in material and biological sciences, such as:

  • Identifying non-ferrous metal alloys
  • Medical diagnostics in cardiology
  • Meat quality measurement in food technology


  • Real-time 1000 measurements per second sampling rate for monitoring rapid changes
  • Simultaneous 15-frequency measurement for detecting subtle changes
  • Compact size that takes limited shelf space
  • Patented technology based on 40 years of experience in impedance measurement
  • Software enables simple customisation for any application

How our technology works

Quadra platform generates a binary waveform with real-time calculation of impedance. It is possible to select different sets of 15 spectrogram frequencies. The highest set, 1 kHz…349 kHz is suitable for applications from tissue and material structure mapping to detection of cells and coatings. The lowest set, 0.5 Hz … 195 Hz extends down to frequencies used for electrochemical applications.

The impedance data is used for mapping and correlation with a phenomenon of interest. The ability to measure multiple frequency points in high repeatability mode results in an accurate real-time characterization of the object.

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