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Optical position feedback for electrostatically driven MOEMS scanners

: Tortschanoff, Andreas; Baumgart, M.; Frank, Albert; Wildenhain, Michael; Sandner, Thilo; Schenk, Harald; Kenda, Andreas


Schenk, H. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
MOEMS and miniaturized systems XI : 24 - 25 January 2012, San Francisco, California
Bellingham, WA: SPIE, 2012 (Proceedings of SPIE 8252)
ISBN: 978-0-8194-8895-4
Paper 82520S
MOEMS and Miniaturized Systems Conference <11, 2012, San Francisco/Calif.>
Photonics West Conference <2012, San Francisco/Calif.>
European Commission EC
FP7-ICT; 248623; TACO
Conference Paper
Fraunhofer IPMS ()

For MOEMS devices which do not have intrinsic on-chip feedback, position information can be provided with optical methods, most simply by using a reflection from the backside of a MOEMS scanner. Measurement of timing signals using fast differential photodiodes can be used for resonant scanner mirrors performing sinusoidal motion with large amplitude. While this approach provides excellent accuracy it cannot be directly extended to arbitrary trajectories or static deflection angles. Another approach is based on the measurement of the position of the reflected laser beam with a quadrant diode. In this work, we present position sensing devices based on either principle and compare both approaches showing first experimental results from the implemented devices.