Eddy current imaging with an atomic radio-frequency magnetometer

Abstract

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.

6 pages, 4 figures

References in corpus (8)

• Optical Magnetometry
• Electromagnetic induction imaging with a radio-frequency atomic magnetometer
• Magnetometry Based on Nonlinear Magneto-Optical Rotation with Amplitude-Modulated Light
• Detection of radio frequency magnetic fields using nonlinear magneto-optical rotation
• Magnetic induction tomography using an all-optical ${}^{87}$Rb atomic magnetometer
• Robust, High-speed, All-Optical Atomic Magnetometer
• Magnetic induction measurements using an all-optical ${}^{87}$Rb atomic magnetometer
• Small-sized Dichroic Atomic Vapor Laser Lock (DAVLL)

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