Abstract
We demonstrate through-skin electromagnetic induction imaging of pilot-holes in an aluminum block concealed by a 0.41 mm thick aluminum shield with a 1.49 kg mechanically translatable radio frequency atomic magnetometer. The pilot-holes are identified and localized with submillimeter accuracy both with and without the Al shield. We utilize a dual-frequency technique to isolate the image of the target while removing the effect of the shielding from the image. Imaging accuracy is shown to be robust in a range of different operating conditions and immune to the effect of a thermal insulator between the shielding and the target. The approach introduced here finds direct application in aircraft wing manufacture and is competitive with existing approaches.
Highlights
Scitation.org/journal/apl in manufacturing where the sensor is placed very close to the skin but we have experimentally verified the efficacy of the technique in a standoff range of 0.1–2.5 mm
We demonstrate through-skin electromagnetic induction imaging of pilot-holes in an aluminum block concealed by a 0.41 mm thick aluminum shield with a 1.49 kg mechanically translatable radio frequency atomic magnetometer
The electronic signal is processed with a lock-in amplifier (LIA), providing a phase-sensitive magnetic resonance, which carries information of the target properties
Summary
Scitation.org/journal/apl in manufacturing where the sensor is placed very close to the skin but we have experimentally verified the efficacy of the technique in a standoff range of 0.1–2.5 mm. ABSTRACT We demonstrate through-skin electromagnetic induction imaging of pilot-holes in an aluminum block concealed by a 0.41 mm thick aluminum shield with a 1.49 kg mechanically translatable radio frequency atomic magnetometer.
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