LTS SQUID sensor with a new configuration

Stolz, R.; Fritzsch, L.; Meyer, H.‐G.

doi:10.1088/0953-2048/12/11/334

Cited by 59 publications

(38 citation statements)

References 7 publications

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“…For the measurement of the magnetic field gradient tensor by means of SQUID gradiometers a sensor family based on the LTS SQUID type SC8B was developed [6]. The first-order SQUID gradiometers were fabricated in the standard all-refractory Nb/AlO X /Nb technology as provided by IPHT Jena on 4-inch silicon substrates [6].…”

Section: Squid Sensorsmentioning

confidence: 99%

“…The first-order SQUID gradiometers were fabricated in the standard all-refractory Nb/AlO X /Nb technology as provided by IPHT Jena on 4-inch silicon substrates [6]. They are waterproof and robust against thermal cycling.…”

Section: Squid Sensorsmentioning

confidence: 99%

“…The washers in each pair are connected in series. A more detailed description of the pickup loops, of the SQUID, and its parameters is given in [6]. A feedback coil is placed close to the SQUID to induce flux into the SQUID.…”

Section: Squid Sensorsmentioning

confidence: 99%

“…Recently planar SQUID gradiometers based on low temperature superconductors (LTS) have been developed [6]. These gradiometers have a base length of 4 cm and show an intrinsic balance or CMRR of about 5,000.…”

Section: Introductionmentioning

confidence: 99%

“…These gradiometers have a base length of 4 cm and show an intrinsic balance or CMRR of about 5,000. This value can be further improved by means of software balancing to better than 10 6 . A noise limited gradient field resolution better than 70 fT/(m√Hz) down to 0.3 Hz is achieved.…”

Section: Introductionmentioning

confidence: 99%

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SQUID technology for geophysical exploration

Meyer

Stolz

Chwala

et al. 2005

phys. stat. sol. (c)

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PACS 85.25.Dq, 91.25.Ga We report on successful tests of planar LTS SQUID gradiometers on airborne platforms such as helicopter and aircraft. The system works stable and allows profile work without any constraints. In mobile applications the gradient resolution at low frequencies is dominated by motion noise, since the parasitic areas of the SQUID gradiometer lead to strong disturbances if the gradiometer is tilted in the homogenous Earth's magnetic field. The balance can be improved further by software using data of a SQUID magnetometer triple.

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Section: Squid Sensorsmentioning

confidence: 99%

Section: Squid Sensorsmentioning

confidence: 99%

Section: Squid Sensorsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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SQUID technology for geophysical exploration

Meyer

Stolz

Chwala

et al. 2005

phys. stat. sol. (c)

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Rapid and sensitive magnetometer surveys of large areas using SQUIDs – the measurement system and its application to the Niederzimmern Neolithic double‐ring ditch exploration

Schultze

Linzen

Schüler³

et al. 2008

Archaeological Prospection

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Ageomagnetic field measurement system for the detection ofarchaeologicalsignaturesinthe subsoil is presented based on the superconducting quantum interference device (SQUID). The system provides fast mapping of large areas with high magnetic field gradient resolution as well as lateral precision. The acquired data are geographically referenced and also the altitude profile is given. The properties of the system were tested intensively at the large Neolithic double-ring ditch enclosure of Niederzimmern near Weimar, Germany. Differences of the signal acquisition compared with caesium magnetometers are discussed. In the Niederzimmern double-ring ditch enclosure, with an area of 27 ha, archaeological patterns were found only near the gates. These SQUID measurements, together with accompanying excavations, provide a complex picture of the double-ring ditch enclosure, dated about 5600 years old.

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Simultaneous magnetoencephalography and SQUID detected nuclear MR in microtesla magnetic fields

Volegov

Matlachov

Espy

et al. 2004

Magnetic Resonance in Med

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A system that simultaneously measures magnetoencephalography (MEG) and nuclear magnetic resonance (NMR) signals from the human brain was designed and fabricated. A superconducting quantum interference device (SQUID) sensor coupled to a gradiometer pickup coil was used to measure the NMR and MEG signals. 1 H NMR spectra with typical Larmor frequencies from 100 -1000 Hz acquired simultaneously with the evoked MEG response from a stimulus to the median nerve are reported. The single SQUID gradiometer was placed approximately over the somatosensory cortex of a human subject to noninvasively record the signals. In this article we describe an instrument for and results from simultaneous recording of an evoked magnetoencephalography (MEG) response and nuclear magnetic resonance (NMR) proton signal from the human brain using a superconducting quantum interference device (SQUID) sensor.MEG is a noninvasive technique that measures magnetic fields at the surface of the head that are the direct consequence of neuronal activity in the living brain (1). MEG requires the use of SQUID sensors to measure the extraordinarily low-level magnetic fields, usually in the range from 10 -15 to 10 -12 T, produced by neuronal activity in the brain. While other functional imaging modalities such as functional MRI depend on the relatively slow and indirect hemodynamic response of the brain, MEG (and electroencephalography, or EEG) can provide measurement of the electromagnetic fields arising from the actual neuronal currents with submillisecond temporal resolution.The inverse problem of source localization from MEG (and EEG) is ill posed. These procedures require models of source current distribution and of the effects of geometry and inhomogeneous conductivity within the head volume conductor. Neural electromagnetic data are often combined with anatomical or functional tomographic data obtained with high-field MRI and functional MRI (fMRI).MEG and MRI data are taken with two completely separate systems because the SQUIDs cannot operate in the large magnetic fields (up to 15 orders of magnitude larger than an MEG signal) required by high-field MRI systems. This necessitates colocalization and data fusion techniques to integrate and superpose the two data sets in an accurate and meaningful way.Recording NMR signals in low fields (B Ͻ 10 -5 T) opens up the possibility of acquiring tomographic images simultaneously with high temporal resolution measurements of MEG, as the magnetic fields required for imaging are now compatible with SQUID sensors. An additional motivation for low-field NMR spectroscopy and MRI is the prospect of reduced system cost and size. For a fixed relative inhomogeneity, broadening of the NMR line scales linearly with the strength of the measurement field, providing very narrow NMR lines (limited by the natural linewidth) at ultralow magnetic fields, and raising the possibility of MRI at lower gradients. Susceptibility artifacts caused by spurious field gradients from the sample, which also broaden resonance lines, are si...

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LTS SQUID sensor with a new configuration

Cited by 59 publications

References 7 publications

SQUID technology for geophysical exploration

SQUID technology for geophysical exploration

Rapid and sensitive magnetometer surveys of large areas using SQUIDs – the measurement system and its application to the Niederzimmern Neolithic double‐ring ditch exploration

Simultaneous magnetoencephalography and SQUID detected nuclear MR in microtesla magnetic fields

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