| Abstract [eng] |
This work object to research possibility of earth magnetic field measurements using proton precession. Designed and made two proton precession magnetometers which magnetic field measurement diapason is 40 µT - 60 µT. In the schematic is used preamplifier SSM2019 which noise density from 100Hz is under 1 nV/√Hz. Preamplifiers amplification coefficient is 60dB. In the project also was used 6 th order Cebychev band pass filter with center frequency of 2,1 kHz. To get signals from amplifier was used „THX SOUND SB1095“ sound card. Data processing was done with „MATLAB“ software. Using 3 second polarized current bursts (3,5A) was achieved 5,4nT device uncertainty, without any digital filtering. With filtering device uncertainty was reduced to 1,3nT Using experiments was determinated minimal quantity of active substance. The magnetic field was measured, measurements data compare with others countries geomagnetic observatory data. Device is suitable to detect materials according the spin-spin relaxation decay constant, when statically magnetic field properties are maintained. |
