A 37 channel DC SQUID magnetometer system

Koch, H.; Cantor, R.; Drung, D.; Erné, S. N.; Matthies, K.; Peters, M.; Ryhänen, Tapani; Scheer, Hans-Jürgen; Hahlbohm, H. D.

doi:10.1109/20.133788

Cited by 52 publications

(9 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Measurement ProceduresTo reduce environmental magnetic noise, the measurements were performed in a magnetically shielded room 15 with a homemade 37-channel SQUID magnetometer, 16 which measures the vertical component of the magnetic field over a plane with a diameter of 210 mm. Data were collected in a bandwidth between DC and 64 Hz with a sampling frequency of 250 Hz.…”

Section: Methodsmentioning

confidence: 99%

High-Resolution Monitoring of the Gastrointestinal Transit of a Magnetically Marked Capsule

Weitschies

Kötitz

Cordini

et al. 1997

Journal of Pharmaceutical Sciences

View full text Add to dashboard Cite

The purpose of this study was to demonstrate that it is possible to continuously monitor the gastrointestinal transit of magnetically marked, solid, oral dosage forms with multichannel biomagnetic measuring equipment and by magnetic source imaging (MSI) methods. For the investigations presented, a sucrose pellet was coated with powdered magnetite (Fe3O4) in poly(methyl methacrylate). Then, the pellet was enclosed in a capsule prepared from silicone rubber and magnetized to obtain a net magnetic dipole moment. After ingestion of the capsule, its magnetic field distribution over the abdomen was recorded for several time intervals with a 37-channel superconducting quantum interference device (SQUID) magnetometer. At each time point, the position of the capsule within the gastrointestinal tract was calculated from the measured field distribution, assuming a magnetic dipole model. The data presented here demonstrate that with this noninvasive method of magnetic marker monitoring it is possible to investigate the gastrointestinal transit of a solid oral dosage form with a temporal resolution in the order of milliseconds and a spatial resolution within a range of millimeters.

show abstract

Section: Methodsmentioning

confidence: 99%

High-Resolution Monitoring of the Gastrointestinal Transit of a Magnetically Marked Capsule

Weitschies

Kötitz

Cordini

et al. 1997

Journal of Pharmaceutical Sciences

View full text Add to dashboard Cite

show abstract

“…The magnetic field was measured simultaneously at 37 points on a horizontal plane 50 mm above the internodal cell with a multichannel magnetometer system consisting of 37 dc-SQUID magnetometers, each with a 50-mm2 pick-up coil and 0.016-250 Hz band width (Fig. 1) (Koch et al, 1991). Experiments were carried out at room temperature in the Berlin magnetically shielded room (Ern6 et al, 1981).…”

Section: Methodsmentioning

confidence: 99%

Magnetic detection of a single action potential in Chara corallina internodal cells

Trontelj

Zorec

Jazbinsek

et al. 1994

Biophysical Journal

View full text Add to dashboard Cite

The electrical activity that occurs in plants has not yet been detected magnetically. Magnetic detection of electrical activity in some animal as well as in human cells and organs, on the other hand, is an established research method. Our experiments demonstrate the propagation of a single action potential in the internodal cell of the green algae Chara corallina, measured magnetically. The propagation velocity and the intracellular current were determined.

show abstract

“…gradiometric SQUIDs or SQUID pickup coils, multiple SQUIDs that form electronic gradiometers, magnetic shields, or active noise cancellation must be used to reduce the effects of environmental noise; the practical limit for sensitivity of several fT/ √ Hz for (1 cm) 2 SQUIDs is usually set by the combination of SQUID, shield, sample, and dewar noise (25). Nevertheless, the SQUID microscope is the most sensitive instrument for imaging magnetic fields with spatial resolutions larger than a few microns.…”

Section: Squid Magnetometersmentioning

confidence: 99%

Scanning Squid Microscopy

Kirtley¹,

Wikswo

1999

Annu. Rev. Mater. Sci.

161

View full text Add to dashboard Cite

The scanning SQUID microscope (SSM) is a powerful tool for imaging magnetic fields above sample surfaces. It has the advantage of high sensitivity and bandwidth and the disadvantages of relatively modest spatial resolution and the requirement of a cooled SQUID sensor. We describe the various implementations of this type of instrument and discuss a number of applications, including magnetic imaging of short circuits in integrated circuits, corrosion currents in aluminum, and trapped flux in superconductors.

show abstract

A 37 channel DC SQUID magnetometer system

Cited by 52 publications

References 13 publications

High-Resolution Monitoring of the Gastrointestinal Transit of a Magnetically Marked Capsule

High-Resolution Monitoring of the Gastrointestinal Transit of a Magnetically Marked Capsule

Magnetic detection of a single action potential in Chara corallina internodal cells

Scanning Squid Microscopy

Contact Info

Product

Resources

About