© 2008 by Proceq SA 7
2 Tutorial
2.1 The Measurement Principle
The Profoscope uses electromagnetic pulse induction
technology to detect rebars.
Coils in the probe are periodically charged by current
pulses and thus generate a magnetic field.
On the surface of any electrically conductive material
which is in the magnetic field eddy currents are produced.
They induce a magnetic field in opposite direction. The
resulting change in voltage can be utilized for the meas-
urement.
Coils
Concrete Magnetic Field
Rebar
The Profoscope uses different coil arrangements to gene-
rate several magnetic fields. Advanced signal processing
allows
1. Localization of a rebar
2. Localization of the mid-point between rebars
3. Determination of the cover
4. Estimation of the bar diameter
This method is unaffected by all non conductive materials
such as concrete*, wood, plastics, bricks etc. However
any kind of conductive materials within the magnetic field
(approx. 400 mm / 16” sphere) will have an influence on
the measurement.
Note: Remove all metallic objects such as rings
and watches before you start measuring.
* Some concrete types and other structural materials may
have metallic content.
Tutorial
To Next Page
Loading...
Need help?
General