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Resistivity : applications, systems

Measure of the Quality of Metals quickly and accurately
with Non Destructive Testing (NDT)

The theory of resistivity involves the ways that materials conduct or resist the flow of electricity and plays an important role in the study of metals and semiconductors. Every metal alloy has its unique level and characteristics of electrical resistivity. Within the same alloy specimen, resistivity varies with the composition of the material and internal structure and/or defects.

Resistivity : Quality measurement of a laser seam weld
Quality measurement of a laser seam weld


Differences in resistivity values provide practical means for NDT inspection and process control including :

  Alloy Sorting

Resistivity : Measurement of material thickness
Measurement of material thickness
in block mode, as well as detecting flaws

Resistivity : Quality measurement of five
Quality measurement of five
independent spot welds


Sprayed Coatings
(metal to metal, metal to non-metal)

  Flaw Detection
  Weld Integrity Assessment
  Stress Corrosion Cracking in Materials
  Crack Depth Measurement
  Case Hardening of Several Materials
  Thickness Measurement
  Spot / Laser Weld Control

  M100A System

NDT Automation's M100A Resistivity Meter provides rapid, accurate measurements of electrical resistivity that yield either bulk or surface characteristics of the material components being tested.

Measurement system of electrical resistivity

The M100A takes advantage of a special form of ohm's law by generating a pair of rapidly reversing direct current pulsing through the two outer probes of a four-point assembly placed on a test specimen. Resulting voltage measurements, taken from the inside points of the probe, are electronically converted to resistivity values for interpretation. This permits rapid evaluation of specific material characteristics. The resulting data is absolute (unlike most other NDT techniques).

Readings can be stored in a PC for automated data recording and / or process control. Effective depth of current penetration is controlled by changing probe configuration. The key to utilizing this technology for non destructive evaluation is the change in resistivity values from one sample to another due to material processing or the presence of defects.



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