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Proceedings Paper

Synchronized microscanner array for large aperture receiver optics of LIDAR systems
Author(s): Thilo Sandner; Thomas Grasshoff; Michael Wildenhain; Harald Schenk
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Paper Abstract

Traditional laser scanners for 3D distance measurement involve expensive, heavy, (potentially) slow rotating mirrors for light deflection of the scanning TOF (time of flight) distance measurement, not suitable for compact, robust and highly portable LIDAR system. On the other hand MEMS scanners are limited to small apertures not suitable for a precise TOF measurement. To overcome this problem Fraunhofer IPMS presents a large aperture 1D-MEMS scanner array especially designed for LIDAR applications. It is composed of 2 × 7 silicon mirror elements each having an identical design with comparatively large aperture of 2.51 × 9.51mm2 and ±30° optical scan range. All mirrors are driven electrostatically resonant with identical frequency close to design frequency of 250 Hz. By driving control all single scanner elements are synchronized to identical phase and amplitude in respect to a master scanner. This results in a large effective scanner aperture of 334 mm2 for the receiver optics and a filling factor of 80 %. To guarantee the synchronized operation the paper discusses in detail the scanner design to enable a sufficiently large frequency bandwidth of all scanner elements to the compensate frequency tolerances caused by fabrication and packaging. In comparison to LIDAR systems with conventional scanner components, the large aperture 1D-MEMS scanner array enables 3D-LIDAR systems to become significantly smaller, more robust and (potentially) less expensive, also higher scan rates can be realized without additional efforts (e.g. no air bearings are needed).

Paper Details

Date Published: 17 February 2010
PDF: 12 pages
Proc. SPIE 7594, MOEMS and Miniaturized Systems IX, 75940C (17 February 2010); doi: 10.1117/12.844923
Show Author Affiliations
Thilo Sandner, Fraunhofer Institute for Photonic Microsystems (Germany)
Thomas Grasshoff, Fraunhofer Institute for Photonic Microsystems (Germany)
Michael Wildenhain, Fraunhofer Institute for Photonic Microsystems (Germany)
Harald Schenk, Fraunhofer Institute for Photonic Microsystems (Germany)

Published in SPIE Proceedings Vol. 7594:
MOEMS and Miniaturized Systems IX
Harald Schenk; Wibool Piyawattanametha, Editor(s)

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