Absolute Probe
An absolute probe is an eddy current sensor with a single active coil that measures absolute conductivity or geometric changes against an internal reference standard.
Physical-Chemical Mechanism of Action
An absolute probe uses an eddy current sensor with a single active coil. It measures the conductivity or geometric changes of the test material directly against an internal reference standard.
Metallurgical Relevance & Risks in Welding
Using an absolute probe is especially important for weld quality control. Incorrect settings or sensor defects can lead to inaccurate measurements, which in turn can cause faulty inspection results and potential cracking.
Shop Practice & Action Guidelines
To set up and use the absolute probe correctly:
1. Ensure the reference standard is properly calibrated.
2. Always hold the probe perpendicular to the weld seam.
3. Use the recommended gap between the probe and the seam (usually 1-2 mm).
4. Read the measurements regularly and compare them to the specific tolerances of the part.