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20 February 2017 Lens-free imaging-based low-cost microsensor for in-line wear debris detection in lube oils
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Proceedings Volume 10110, Photonic Instrumentation Engineering IV; 101101D (2017)
Event: SPIE OPTO, 2017, San Francisco, California, United States
The current paper describes the application of lens-free imaging principles for the detection and classification of wear debris in lubricant oils. The potential benefits brought by the lens-free microscopy techniques in terms of resolution, deep of field and active areas have been tailored to develop a micro sensor for the in-line monitoring of wear debris in oils used in lubricated or hydraulic machines as gearboxes, actuators, engines, etc. The current work presents a laboratory test-bench used for evaluating the optical performance of the lens-free approach applied to the wear particle detection in oil samples. Additionally, the current prototype sensor is presented, which integrates a LED light source, CMOS imager, embedded CPU, the measurement cell and the appropriate optical components for setting up the lens-free system. The imaging performance is quantified using micro structured samples, as well as by imaging real used lubricant oils. Probing a large volume with a decent 2D spatial resolution, this lens-free micro sensor can provide a powerful tool at very low cost for inline wear debris monitoring.
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Jon Mabe, Joseba Zubia, and Eneko Gorritxategi "Lens-free imaging-based low-cost microsensor for in-line wear debris detection in lube oils", Proc. SPIE 10110, Photonic Instrumentation Engineering IV, 101101D (20 February 2017);

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