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As the Millennium approaches the oil-drilling industry shows growing demand for low cost tools which help to increase drilling accuracy, provide information on the profile of the finished hole, and allow accurate multi-drilling alignment. This new compass is able to read magnetic fields exceeding in magnitude the magnetic field of Earth. Generally the intensity of Earth’s magnetic field is about 600 mGauss, and has components parallel to the earth’s surface, which always points to magnetic north. Magnetic North is defined as Earth’s magnetic pole and it usually differs by about 11.5 degrees from the True North, which is Earth’s rotational axis. The following diagram demonstrates general schematic and major interconnection of key sections of the AOSI’s EZ-COMPASS. For many years coil based magnetic sensors; such as Fluxgate and Magneto-inductive; were used to detect changes in magnetic field. However, with the higher complexity of applications and the shrinking tool size these bulky sensors become unusable. The magnetometer is composed of three sensors positioned orthogonally to each other. The direction of each sensor corresponds to the direction of each component to Earth’s magnetic field. linearity. The most common ferrous distortions are: 1. Placing the compass inside a vehicle 2. Driving over a metal bridge or over utility pipes. 3. On a ship 4. Near a transformer or any random ferrous object.
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