| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 749045 | Sensors and Actuators A: Physical | 2012 | 7 Pages |
We demonstrate a contactless hybrid sensor for the simultaneous detection of light reflectance and eddy currents. The sensor is based on combining an optical system with an RLC self-resonator, wherein the reflected light intensity and resonance frequency are measured. We demonstrate that the hybrid sensor can be used for monitoring metals coated with non-metallic films. Whereas the self-resonator can efficiently distinguish between metals and non-metals, the optical subsystem is sensitive to changes in the reflectance of light. A systematic investigation of the detector response as a function of distance to the material under test is undertaken to characterize its behavior.
► A hybrid sensor for monitoring coated metals is proposed. ► The sensor combines eddy current and optical reflectance measurements. ► Resonance frequency measurements show submillimeter position sensitivity. ► Optical reflectance measurements show a weak position sensitivity.
