Mobile HTS SQUID System for Eddy Current Testing of Aircraft

Krause, H.; Hohmann, R.; Soltner, H.; Lomparski, D.; Grüneklee, M.; Banzet, M.; Schubert, J.; Zander, W.; Zhang, Y.; Wolf, Werner; Bousack, Herbert; Braginski, A. I.; Lucı́a, M. L.; Zimmermann, Egon; Brandenburg, G.; Clemens, U.; Rongen, Heinz; Halling, H.; Faley, M.I.; Poppe, U.; Buschmann, H.; Spörl, Gabriele; Binneberg, A.; Junger, Miguel C.

doi:10.1007/978-1-4615-5947-4_137

Cited by 8 publications

(4 citation statements)

References 13 publications

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“…In “traditional” NDE, high-T c DC SQUID systems have demonstrated their superior capabilities for the inspection of metal plates, aircraft wheels and fuselage and pre-stressed concrete bridges [5,6,39,40,41,42]. The chosen measurement scheme depends on the NDE application: an eddy current excitation scheme and a narrowband lock-in readout scheme are used for the investigation of metal plates and aircraft parts, while measurements of static magnetic fields are efficient for monitoring magnetic flux leakage from ferromagnetic objects such as the pre-stressed steel tendons of concrete bridges.…”

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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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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“…The SQUID signal digitally supplied by the FIFO is then multiplied by the excitation sine wave and low-pass fittered to arrive at the lock-in signal. A NDE application with digital FLL is described in another contribution in this volume [3]. Biomagnetical and geological applications ofthe digital system are described elsewhere [7].…”

Section: Eddy Current Excitation and Lock-in Detectionmentioning

confidence: 99%

“…At many applications, analog FLL circuits are used with good linearity, slewrate, system noise and dynamic range [2,6]. But for the operation ofHTS-SQUID magnetometersinan eddy current system, for the detection of deep-lying flaws in aircraft structures, which requires an extremely !arge measurement range from 1 pT to 100 jlT, the analog FLL is not sufficient [3].…”

Section: Introductionmentioning

confidence: 99%

HTS-SQUID Magnetometer with Digital Feedback Control for NDE Applications

Zimmermann

Brandenburg

Clemens

et al. 1997

Review of Progress in Quantitative Nondestructive Evaluation

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“…For eddy current NDE, SQUIDs can be used with a low frequency excitation current to image cracks or material loss deep in aluminum structures. To detect the subsurface cracks adjacent to a fastener in multilayer aircraft structures, SQUID NDE measurements have utilized a sheet inducer [1] combined with depthselective techniques [2,3], a gridiron coil inducer combined with pulsed eddy current techniques [4], and a double-D inducer [5].…”

Section: Introductionmentioning

confidence: 99%