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  • Araujo, JeffersonPontifical Catholic University of Rio de Janeiro, Brazil (författare)

Characterizing complex mineral structures in thin sections of geological samples with a scanning hall effect microscope

  • Artikel/kapitelEngelska2019

Förlag, utgivningsår, omfång ...

  • 2019-04-05
  • MDPI AG,2019
  • printrdacarrier

Nummerbeteckningar

  • LIBRIS-ID:oai:DiVA.org:ri-39518
  • https://urn.kb.se/resolve?urn=urn:nbn:se:ri:diva-39518URI
  • https://doi.org/10.3390/s19071636DOI

Kompletterande språkuppgifter

  • Språk:engelska
  • Sammanfattning på:engelska

Ingår i deldatabas

Klassifikation

  • Ämneskategori:ref swepub-contenttype
  • Ämneskategori:art swepub-publicationtype

Anmärkningar

  • Funding details: Conselho Nacional de Desenvolvimento Científico e Tecnológico; Funding details: Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro; Funding details: Coordenação de Aperfeiçoamento de Pessoal de Nível Superior; Funding text 1: Funding: This study was funded in part by the following Brazilian agencies: The National Council for Scientific and Technological Development (Conselho Nacional de Desenvolvimento Científico e Tecnológico—CNPq), the Coordinating Agency for the Improvement of Higher Education (Coordenação de Aperfeicoamento de Pessoal de Nível Superior—Capes) and the Research Support Foundation of Rio de Janeiro (Fundação de Amparo à Pesquisa do Estado do Rio de Janeiro—FAPERJ).
  • We improved a magnetic scanning microscope for measuring the magnetic properties of minerals in thin sections of geological samples at submillimeter scales. The microscope is comprised of a 200 µm diameter Hall sensor that is located at a distance of 142 µm from the sample; an electromagnet capable of applying up to 500 mT DC magnetic fields to the sample over a 40 mm diameter region; a second Hall sensor arranged in a gradiometric configuration to cancel the background signal applied by the electromagnet and reduce the overall noise in the system; a custom-designed electronics system to bias the sensors and allow adjustments to the background signal cancelation; and a scanning XY stage with micrometer resolution. Our system achieves a spatial resolution of 200 µm with a noise at 6.0 Hz of 300 nT rms /(Hz) 1/2 in an unshielded environment. The magnetic moment sensitivity is 1.3 × 10 −11 Am 2 . We successfully measured the representative magnetization of a geological sample using an alternative model that takes the sample geometry into account and identified different micrometric characteristics in the sample slice.

Ämnesord och genrebeteckningar

  • Geological sample
  • Hall sensor
  • Magnetic materials
  • Magnetic scanning microscope
  • Electromagnets
  • Geology
  • Hall effect transducers
  • Magnetic moments
  • Scanning
  • Background signals
  • DC magnetic field
  • Electronics system
  • Geological samples
  • Spatial resolution
  • Unshielded environment
  • Microscopes

Biuppslag (personer, institutioner, konferenser, titlar ...)

  • Reis, AndreObservatório Nacional, Brazil (författare)
  • Oliveira, VanderleiObservatório Nacional, Brazil (författare)
  • Santos, AmandaUniversity of California, US (författare)
  • Luz-Lima, CleaneoUniversidade Federal do Piauí, Brazil (författare)
  • Yokoyama, ElderUniversity of Brasília, Brazil (författare)
  • Mendoza, LeonardoUniversidade Estadual do Rio de Janeiro, Brazil (författare)
  • Pereira, JoaoRISE,Acreo(Swepub:ri)joaope@ri.se (författare)
  • Bruno, AntonioPontifical Catholic University of Rio de Janeiro, Brazil (författare)
  • Pontifical Catholic University of Rio de Janeiro, BrazilObservatório Nacional, Brazil (creator_code:org_t)

Sammanhörande titlar

  • Ingår i:Sensors: MDPI AG19:71424-8220

Internetlänk

Hitta via bibliotek

  • Sensors (Sök värdpublikationen i LIBRIS)

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