Investigation of a Lorentz force biomagnetometer

Bruce C. Towe

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

This work evaluates an approach to the noninvasive measurement of small ionic current flows by a technique of Lorentz force magnetometry. An instrument was constructed that is basically a very sensitive force-balance that can measure Lorentz forces experienced by ionic currents flowing in small objects when exposed to strong oscillating magnetic fields. For objects that can fit on a microscope slide, the system is sensitive to ion current dipole moments as low as 180 pA-m. Images were made of ionic currents flowing in thin profiles by a process of scanning a localized magnetic field over the object, measuring generated Lorentz forces, and using a computer to reconstruct images. It can be shown that this method of Lorentz magnetometry has an immunity to ambient magnetic noise and has system characteristics that might suggest its possible use in biomagnetometry of small thin specimens.

Original languageEnglish (US)
Pages (from-to)455-461
Number of pages7
JournalIEEE Transactions on Biomedical Engineering
Volume44
Issue number6
DOIs
StatePublished - Jun 1997

Fingerprint

Lorentz force
Magnetic fields
Dipole moment
Microscopes
Scanning
Ions
Magnetometry

Keywords

  • Biocurrent measurement
  • biomagnetometry
  • ionic current measurement

ASJC Scopus subject areas

  • Biomedical Engineering

Cite this

Investigation of a Lorentz force biomagnetometer. / Towe, Bruce C.

In: IEEE Transactions on Biomedical Engineering, Vol. 44, No. 6, 06.1997, p. 455-461.

Research output: Contribution to journalArticle

@article{01e248f39b7a42e5869784450e38960a,
title = "Investigation of a Lorentz force biomagnetometer",
abstract = "This work evaluates an approach to the noninvasive measurement of small ionic current flows by a technique of Lorentz force magnetometry. An instrument was constructed that is basically a very sensitive force-balance that can measure Lorentz forces experienced by ionic currents flowing in small objects when exposed to strong oscillating magnetic fields. For objects that can fit on a microscope slide, the system is sensitive to ion current dipole moments as low as 180 pA-m. Images were made of ionic currents flowing in thin profiles by a process of scanning a localized magnetic field over the object, measuring generated Lorentz forces, and using a computer to reconstruct images. It can be shown that this method of Lorentz magnetometry has an immunity to ambient magnetic noise and has system characteristics that might suggest its possible use in biomagnetometry of small thin specimens.",
keywords = "Biocurrent measurement, biomagnetometry, ionic current measurement",
author = "Towe, {Bruce C.}",
year = "1997",
month = "6",
doi = "10.1109/10.581933",
language = "English (US)",
volume = "44",
pages = "455--461",
journal = "IEEE Transactions on Biomedical Engineering",
issn = "0018-9294",
publisher = "IEEE Computer Society",
number = "6",

}

TY - JOUR

T1 - Investigation of a Lorentz force biomagnetometer

AU - Towe, Bruce C.

PY - 1997/6

Y1 - 1997/6

N2 - This work evaluates an approach to the noninvasive measurement of small ionic current flows by a technique of Lorentz force magnetometry. An instrument was constructed that is basically a very sensitive force-balance that can measure Lorentz forces experienced by ionic currents flowing in small objects when exposed to strong oscillating magnetic fields. For objects that can fit on a microscope slide, the system is sensitive to ion current dipole moments as low as 180 pA-m. Images were made of ionic currents flowing in thin profiles by a process of scanning a localized magnetic field over the object, measuring generated Lorentz forces, and using a computer to reconstruct images. It can be shown that this method of Lorentz magnetometry has an immunity to ambient magnetic noise and has system characteristics that might suggest its possible use in biomagnetometry of small thin specimens.

AB - This work evaluates an approach to the noninvasive measurement of small ionic current flows by a technique of Lorentz force magnetometry. An instrument was constructed that is basically a very sensitive force-balance that can measure Lorentz forces experienced by ionic currents flowing in small objects when exposed to strong oscillating magnetic fields. For objects that can fit on a microscope slide, the system is sensitive to ion current dipole moments as low as 180 pA-m. Images were made of ionic currents flowing in thin profiles by a process of scanning a localized magnetic field over the object, measuring generated Lorentz forces, and using a computer to reconstruct images. It can be shown that this method of Lorentz magnetometry has an immunity to ambient magnetic noise and has system characteristics that might suggest its possible use in biomagnetometry of small thin specimens.

KW - Biocurrent measurement

KW - biomagnetometry

KW - ionic current measurement

UR - http://www.scopus.com/inward/record.url?scp=0031172853&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0031172853&partnerID=8YFLogxK

U2 - 10.1109/10.581933

DO - 10.1109/10.581933

M3 - Article

C2 - 9151478

AN - SCOPUS:0031172853

VL - 44

SP - 455

EP - 461

JO - IEEE Transactions on Biomedical Engineering

JF - IEEE Transactions on Biomedical Engineering

SN - 0018-9294

IS - 6

ER -