MOEMS translatory actuator characterisation,position encoding and closed-loop control |
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Authors: | Lenzhofer M. Tortschanoff A. Frank A. Sandner T. Schenk H. Kraft M. Kenda A. |
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Affiliation: | 1.CTR Carinthian Tech Research AG, Europastraße 4, 9524, Villach/St. Magdalen, Austria ;2.Fraunhofer Institute for Photonic Microsystems, Maria-Reiche-Straße 2, 01109, Dresden, Germany ; |
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Abstract: | Recent developments in optical micro-electro-mechanical systems (MEMS) have produced rapidly oscillating translatory micro-mirrors with out-of-plane mirror displacements exceeding ±100 μm, which have a great potential for various applications requiring high-speed optical path difference modulation. A key factor affecting their practical applicability is a reliable operation control of the MEMS element. Presented here is a pro-active solution combining a laser reference interferometer with a novel position detection scheme and a dedicated control circuitry. By demodulating and processing the laser reference signal, the zero-crossing point of the moving MEMS device can be detected with an accuracy of one interference fringe only. This allows generating a highly accurate mirror control signal in real-time, enabling the implementation of a unique closed-loop control of such MEMS devices and thus ensuring optimally stable MEMS operation and maximal mechanical amplitudes even under varying environmental conditions. The presented solution so provides a vital step forward in the real-world deployment of optical systems using translatory micro-devices. |
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