Eddy current imaging with an atomic radio-frequency magnetometer

We use a radio-frequency \(^{85}\)Rb alkali-vapor cell magnetometer based on a paraffin-coated cell with long spin-coherence time and a small, low-inductance driving coil to create highly resolved conductivity maps of different objects. We resolve sub-mm features in conductive objects, we characteri...

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Bibliographic Details
Published inarXiv.org
Main Authors Wickenbrock, Arne, Leefer, Nathan, Blanchard, John W, Budker, Dmitry
Format Paper Journal Article
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 16.03.2016
Subjects
Coils
Conductivity
Eddy currents
Frequency response
Inductance
Object recognition
Paraffins
Physics - Atomic Physics
Physics - Instrumentation and Detectors
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Summary:We use a radio-frequency \(^{85}\)Rb alkali-vapor cell magnetometer based on a paraffin-coated cell with long spin-coherence time and a small, low-inductance driving coil to create highly resolved conductivity maps of different objects. We resolve sub-mm features in conductive objects, we characterize the frequency response of our technique, and by operating at frequencies up to 250 kHz we are able to discriminate between differently conductive materials based on the induced response. The method is suited to cover a wide range of driving frequencies and can potentially be used for detecting non-metallic objects with low DC conductivity.
ISSN:2331-8422
DOI:10.48550/arxiv.1603.05067