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• W72046219 abstract "Proton precession magnetometer is a scalar magnetometer which is used in the total component measurement of the magnetic field. This paper describes an attempt to develop a proton precession magnetometer for the measurement of diurnal variation of the earth magnetic field in Sri Lanka. The magnetometer constructed consists of a sensor in dual solenoid configuration, containing water as the proton rich material, and an amplifier chain which was designed to suite the magnetic field measurements in Sri Lanka and a polarizing and energy dissipation handling circuit controlled by a Microchip PIC16F877A microcontroller. The proton precession signal which is in the audio range was digitized using a sound card of a personal computer and the frequency of the proton precession signal was determined using fast Fourier transform. 50 hours observations of the diurnal variations of the geomagnetic field, carried out in a location at Wattala, Sri Lanka was used to asses the functionality of the system. Proton precession magnetometer is a scalar magnetometer which is used for the measurement of the total magnetic field of the earth. The measurements of geomagnetic field is important for mineral and petroleum exploration, geological mapping, search for buried or sunken objects, magnetic field mapping, geophysical research, magnetic observatory use, measurement of magnetic properties of rocks or ferromagnetic objects, archaeological prospecting, conductivity mapping, gradiometer surveying, and magnetic modeling[1]. In particular, due to the fact that the geomagnetic equator lies over Sri Lanka, geomagnetic measurements carried out in Sri Lanka are very important for geomagnetic and ionospheric research [2,3]. However, only a few measurements carried out in this region have been reported [2,3,4]. The proton magnetometer described in this paper was developed with a view to fill this gap through the initiation of a geomagnetic research program. The proton precession magnetometer is based on the precession of protons in a magnetic field [5]. The magnetic dipoles of protons (hydrogen nuclei) contained in a sample of water or a hydrocarbon are temporarily aligned or polarized by application of a magnetic field produced by a current in a coil of wire. When the current is suddenly removed, the spin of the protons causes them to precess about the direction of the earth magnetic field. This precession of protons causes a small signal in the same coil used to polarize them. The frequency of the signal is proportional to the total magnetic field intensity." @default.
• W72046219 created "2016-06-24" @default.
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• W72046219 date "2008-01-01" @default.
• W72046219 modified "2023-09-24" @default.
• W72046219 title "Construction of a Proton Magnetometer" @default.
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