The gyroscopic verticality probe acquires borehole inclination/azimuth logs in situations where metal casing or magnetic materials around the borehole prevent use of the standard verticality probe. The 3D-magnetometer version also acquires 3D-magnetic data for location of magnetic ore bodies.
Principle of Measurement:
The standard probe includes a gimbal-mounted directional gyroscope for orientational measurement and two accelerometers for inclination. In the 3D magnetometer probe, an additional triaxial fluxgate magnetometer continuously measures X, Y and Z magnetic components. These are used to compute the magnitude and direction of the magnetic field around the probe.