Prototype of Multi-Channel High-Tc SQUID Metallic Contaminant Detector for Large Sized Packaged Food

Tanaka, Saburo; Ohtani, Takeyoshi; Krause, Hans‐Joachim

doi:10.1587/transele.e100.c.269

Cited by 7 publications

(3 citation statements)

References 9 publications

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“…Another prospective application of high-T c SQUIDs is a multi-channel system intended for the detection of magnetic metallic contaminants in packaged food [45]. …”

Section: Low-tc and High-tc Squid Nde Systemsmentioning

confidence: 99%

Superconducting Quantum Interferometers for Nondestructive Evaluation

Faley

Kostyurina

Kalashnikov

et al. 2017

Sensors

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We review stationary and mobile systems that are used for the nondestructive evaluation of room temperature objects and are based on superconducting quantum interference devices (SQUIDs). The systems are optimized for samples whose dimensions are between 10 micrometers and several meters. Stray magnetic fields from small samples (10 µm–10 cm) are studied using a SQUID microscope equipped with a magnetic flux antenna, which is fed through the walls of liquid nitrogen cryostat and a hole in the SQUID’s pick-up loop and returned sidewards from the SQUID back to the sample. The SQUID microscope does not disturb the magnetization of the sample during image recording due to the decoupling of the magnetic flux antenna from the modulation and feedback coil. For larger samples, we use a hand-held mobile liquid nitrogen minicryostat with a first order planar gradiometric SQUID sensor. Low-Tc DC SQUID systems that are designed for NDE measurements of bio-objects are able to operate with sufficient resolution in a magnetically unshielded environment. High-Tc DC SQUID magnetometers that are operated in a magnetic shield demonstrate a magnetic field resolution of ~4 fT/√Hz at 77 K. This sensitivity is improved to ~2 fT/√Hz at 77 K by using a soft magnetic flux antenna.

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“…Another prospective application of high-T c SQUIDs is a multi-channel system intended for the detection of magnetic metallic contaminants in packaged food [45]. …”

Section: Low-tc and High-tc Squid Nde Systemsmentioning

confidence: 99%

Superconducting Quantum Interferometers for Nondestructive Evaluation

Faley

Kostyurina

Kalashnikov

et al. 2017

Sensors

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“…Superconducting quantum interference device (SQUID) magnetometers and gradiometers made from the high critical temperature (high-T c ) superconducting material YBa 2 Cu 3 O 7−x (YBCO) are nowadays used in various applications like geophysical exploration [1][2][3], nondestructive evaluation (NDE) and contaminant detection [4][5][6], as well as in biomedical applications, such as magnetocardiography (MCG) [7], magnetoencephalography (MEG) [8][9][10], and biosensing using magnetic nanoparticles [11][12][13]. Thanks to their high critical temperature, high-T c SQUIDs have reduced cooling requirements compared to their low-T c counterparts, which allows for cheaper sensor operation, more compact systems [3], and reduced sensor standoff distance to nearby sources leading to higher signal amplitudes [8,10,14].…”

Section: Introductionmentioning

confidence: 99%

The role of kinetic inductance on the performance of YBCO SQUID magnetometers

Ruffieux

Kalaboukhov

Xie

et al. 2020

Supercond. Sci. Technol.

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Inductance is a key parameter when optimizing the performance of superconducting quantum interference device (SQUID) magnetometers made from the high temperature superconductor YBa 2 Cu 3 O 7−x (YBCO) because lower SQUID inductance L leads to lower flux noise, but also weaker coupling to the pickup loop. In order to optimize the SQUID design, we combine inductance simulations and measurements to extract the different inductance contributions, and measure the dependence of the transfer function V Φ and flux noise SA comparison between two samples shows that the kinetic inductance contribution varies strongly with film quality, hence making inductance measurements a crucial part of the SQUID characterisation. Thanks to the improved estimation of the kinetic inductance contribution, previously found discrepancies between theoretical estimates and measured values of V Φ and S 1/2 Φ could to a large extent be avoided. We then use the measurements and improved theoretical estimations to optimize the SQUID geometry and reach a noise level of S 1/2 B = 44 fT/ √ Hz for the best SQUID magnetometer with a 8.6 mm × 9.2 mm directly coupled pickup loop. Lastly, we demonstrate a method for reliable one-time sensor calibration that is constant in a temperature range of several kelvin despite the presence of temperature dependent coupling contributions, such as the kinetic inductance. The found variability of the kinetic inductance contribution has implications not only for the design of YBCO SQUID magnetometers, but for all narrow linewidth SQUID-based devices operated close to their critical temperature.

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“…The peak-to-peak value of the signal depends on the distance between the sample and the SQUID, which is inversely proportional to the cube of the distance [11]. We calculated dependence of the signal on the depth (from the top of the trench to the bottom) for the three metal samples of different sizes.…”

Section: ) Dependence Of Depthmentioning

confidence: 99%

Consideration of Magnetic Dipole Orientation in Liquid Detected by Metallic Contaminants Detection System Using High-Tc SQUID

Tanaka¹,

Sagawa²,

Hayashi³

et al. 2022

IEEE Trans. Appl. Supercond.

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The market for high-performance lithium-ion (Li-ion) batteries is growing rapidly as automobiles become electrified. The presence of small metallic particles of the order of 10 µm in a battery is likely to cause failure; therefore, it is important to eliminate them. We have developed a prototype system for detecting metallic foreign matter in liquid components for Li-ion batteries using a high-temperature superconducting radio-frequency superconducting quantum interference device, which is a highly sensitive magnetic sensor. Signal waveforms of a magnetized metallic piece passing through a trench located below the SQUID were measured. We found that the waveform depended on the direction of the magnetic dipole at the time of detection and could be roughly divided into six categories to explain all the experimental results. The maximum magnitude obtained for each sample was plotted against the equivalent spherical diameter of the sample. Our results indicate that the signal intensity was proportional to the cube of the sample diameter and that particles larger than φ20 µm × 30 µm (equivalent spherical diameter 23 µm) were detected with signal-to-noise ratio ≥3.

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Prototype of Multi-Channel High-Tc SQUID Metallic Contaminant Detector for Large Sized Packaged Food

Cited by 7 publications

References 9 publications

Superconducting Quantum Interferometers for Nondestructive Evaluation

Superconducting Quantum Interferometers for Nondestructive Evaluation

The role of kinetic inductance on the performance of YBCO SQUID magnetometers

Consideration of Magnetic Dipole Orientation in Liquid Detected by Metallic Contaminants Detection System Using High-Tc SQUID

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