We present a sensor-based, real-time position feedback mechanism for piezoelectric fiber-based optical scanners. In this method, a micro-magnet attached to the tip of the fiber cantilever generates a three-dimensional magnetic field that can be measured by a micro-sized 3D Hall sensor embedded in the cap of the endoscopic probe. A previously recorded mapping between the magnetic field distribution on the sensor and the corresponding spatial location of the magnet, which is invariant with respect to the scanner operation, can then be used at any given time to recall the position of the laser spot on the imaging plane.

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Gerardo E. González-Cerdas, Caglar Ataman, Hans Zappe, and Shahab Haidarian, "Sensor-based position feedback for miniaturized piezoelectric fiber optic scanners," Proc. SPIE 12434, MOEMS and Miniaturized Systems XXII, 124340G (Presented at SPIE OPTO: January 31, 2023; Published: 17 March 2023); https://doi.org/10.1117/12.2655329.6321436179112.