Planar HTS gradiometers with large baseline

Zhang, Y.; Soltner, H.; Krause, Hans‐Joachim; Sodtke, E.; Zander, W.; Schubert, J.; Grüneklee, M.; Lomparski, D.; Banzet, M.; Bousack, Herbert; Braginski, A. I.

doi:10.1109/77.621888

Cited by 34 publications

(8 citation statements)

References 8 publications

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“…All the dc SQUID-based gradiometers described above have the disadvantage that the SQUID itself has a nonzero response to magnetic field, producing an intrinsic imbalance. This problem is circumvented in the rf SQUID-based gradiometer by Zhang, Soltner, Krause et al (1997), resembling the configuration of Fig. 32(a), with a single, step-edge junction intersecting the central strip.…”

Section: B Gradiometric Flux Transformersmentioning

confidence: 99%

High-transition-temperature superconducting quantum interference devices

et al. 1999

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Section: B Gradiometric Flux Transformersmentioning

confidence: 99%

High-transition-temperature superconducting quantum interference devices

et al. 1999

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“…The increase during movement may originate from sensor vibrations, from the motion of flux lines in the superconducting YBCO films, or from eddy currents generated in the copper by power line and other low-frequency fields. Recent work [7] with a new integration scheme, using a sapphire cold finger for planar rf gradiometers [14] operated with a Joule-Thomson cryocooler, demonstrates clearly that even during movement, the sensitivity ofthe SQUID is only weakly impaired. This leaves the last explanation as the most probable.…”

Section: Discussionmentioning

confidence: 99%

Mobile HTS SQUID System for Eddy Current Testing of Aircraft

Krause

Hohmann

Soltner

et al. 1997

Review of Progress in Quantitative Nondestructive Evaluation

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“…The YBCO HTS RF SQUID planar gradiometer was made by Julich SQUID Company (JSQ) [10]. Its baseline is 3.6 mm and the gradient field sensitivity is less than 1 pT 3.6 mm Hz at frequencies over 10 Hz.…”

Section: A Block Diagram Of the Saw-wave Eddy-current Ndementioning

confidence: 99%

Saw-wave excitation eddy-current nde based on hts rf squid

Yoshizawa

2003

IEEE Trans. Appl. Supercond.

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Using a high-temperature superconductor radio frequency superconducting quantum interference device planar gradiometer as the sensor, we developed a saw-tooth wave excitation eddy-current nondestructive evaluation device. By analyzing the amplitudes of harmonics in the response signal of the sample, we successfully detected the artificial defect in an aluminum plate and estimated the depth of the defect. We also demonstrated the possibility to construct the three-dimensional profile of a defect. In our program for data processing, we used a multiplying method to calculate the amplitudes of the harmonics, which was much faster than fast Fourier transform. During the experiment, the movement of -stage, data acquisition, and data processing could be done simultaneously.Index Terms-Eddy current, nondestructive evaluation (NDE), saw wave, superconducting quantum interference device (SQUID).

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Planar HTS gradiometers with large baseline

Cited by 34 publications

References 8 publications

High-transition-temperature superconducting quantum interference devices

High-transition-temperature superconducting quantum interference devices

Mobile HTS SQUID System for Eddy Current Testing of Aircraft

Saw-wave excitation eddy-current nde based on hts rf squid

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