Magnetic Geophysical Method Essay Example | Topics and Well Written Essays - 3000 words

Magnetic geophysical Method - Essay ExampleSteel objects buried in the earth also help in the production of the strong anomalies or magnetised fields. The magnetized field of the earth foundation be approximated in the sense that the charismatic dipole is situated slightly off the center of the earth and that the dipole is mold close to fifteen degrees to the axis of the rotation (Sherriff97). The magnetic field of the earth is believed to be developed by a dynamo that is driven by convection currents in the molten core of the earth. Instrumentation Magnetometers atomic number 18 the instruments which are employ in this method to take measurements of the magnetic field of the earth. The field of specialty or the intensity of the magnetic field of the earth is actually what is measured by the magnetic geophysical method, and it is measured in harm of Tesla (T). There are various types of magnetometers used in this method. The magnetometer used usually reflects the physical ac t whereby the magnetic field of the earth is measured. These types of magnetometers used are highly accurate and reliable in the field. They can be able to measure the local magnetic field of the earth to a high precision degree. ... If there is no external magnetic field on the earth, there leave behind be a cancellation of the primary coils. If there is the presence of the external magnetic field, one of the primary coils in the instrument will tend to saturate before the other primary coil. This then leads to the creation of an imbalance in the magnetic field that is to be detected through the induction of EM in the secondary coil (Mishra40). The proton priority instrument that is used by environmentalists and engineers is characterized by a sensor that has a fluid similar to kerosene that is hydrogen rich. For the instrument to be successful in the magnetic geophysical method, a strong magnetic field is created by an inductor to the fluid which leads to the alignment of the protons. After the suspension of the inducted current, the rate of relaxation is save as the protons tend to return to the ambient magnetic conditions. The magnetic field of the earth is directly proportionate to the relaxation rate (Mishra45). A variation on the proton precession magnetometer can be presented by an overhauser magnetometer by the use of the magnetic fields from the radio relative frequency to produce the polarizing signal. By this, the results apt(p) by the proton precession magnetometer is improved because the procession signal is not interfered with by the radio frequency used. The gradiometer magnetometer tends to measure the gradient of the magnetic field of the earth rather than measuring the total strength of the field. Though the magnetic gradient anomalies are not highly useful to geological operations, they are reformatory in the provision of a better definition of shallow features that are buried for example drums and tanks. The gradiometer magnetomet ers are useful in areas