| Revista: | Revista brasileira de geofisica |
| Base de datos: | PERIÓDICA |
| Número de sistema: | 000338661 |
| ISSN: | 0102-261X |
| Autors: | Kabata, Wanderli1 Vitorello, Icaro1 |
| Institucions: | 1Instituto Nacional de Pesquisas Espaciais, Divisao de Geofisica Espacial, Sao Jose dos Campos, Sao Paulo. Brasil |
| Any: | 2007 |
| Període: | Abr-Jun |
| Volum: | 25 |
| Número: | 2 |
| Paginació: | 159-169 |
| País: | Brasil |
| Idioma: | Portugués |
| Tipo de documento: | Artículo |
| Enfoque: | Aplicado, descriptivo |
| Resumen en inglés | Fluxgate magnetometers are widely used in weak magnetic field measurements, mainly for purposes associated with geomagnetic observations, mineral prospecting and space research, because of their low power consumption, low noise level, large dynamic band and great sensitivity. Recent applications of soft magnetism in amorphous alloys have created a renewed stimulus to advance research in magnetic sensors, for deployment in tropical and sub tropical regions resembling Brazil. In the present study, ring cores made of amorphous ribbons are used to investigate the behavior of alternative fluxgate configurations to be introduced in the next generation of magnetometers to be developed at INPE for geomagnetic soundings. The results show the potential of temperature compensations in the fluxgate by the use of a modified feedback circuit, which provides, at the same time, the magnetic field feedback and the required magnetic field compensation due to temperature variations. The study of a direct-driven excitation provided by an amorphous tape-wrapped ring core provides support for a 2nd harmonic magnetometer with sensitivity characteristics similar to those obtained with a conventional excitation, yet operated with less power consumption |
| Resumen en portugués | Magnetometros fluxgates sao amplamente usados em medidas do campo magnetico de baixa intensidade, principalmente para finalidades associadas a observacoes geomagneticas, prospeccao mineral e pesquisa espacial, por causa do consumo pequeno, nıvel de ruıdo baixo, faixa dinamica ampla e grande sensibilidade. Aplicacoes recentes de magnetismo mole, caracterıstico de ligas amorfas, tem criado novos estımulos para o avanco da pesquisa em sensores magneticos para serem instalados em regioes tropicais e subtropicais como o Brasil. Neste estudo, n´ucleos feitos de fitas de ligas amorfas sao usados na investigacao de configuracoes alternativas a serem introduzidas na construcao dos proximos magnetometros construıdos no INPE para sondagens geomagneticas |
| Disciplines | Geociencias, Ingeniería |
| Paraules clau: | Geofísica, Ingeniería de instrumentos, Magnetómetros, Fluxgate, Excitación directa, Sondeos geomagnéticos, Campo magnético |
| Keyword: | Earth sciences, Engineering, Geophysics, Instrumentation engineering, Magnetometers, Fluxgate, Direct excitation, Geomagnetic sounding, Magnetic field |
| Text complet: | Texto completo (Ver PDF) |
