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Proceedings Paper

Performance and reliability test of MEMS optical scanners
Author(s): Steffen Kurth; Christian Kaufmann; Ramon Hahn; Jan Mehner; Wolfram Dötzel; Thomas Gessner
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Paper Abstract

MEMS scanners are among the devices which have been investigated since the very beginning of MEMS development. The main concern of this paper is to report and discuss suitable measurement techniques and to compare and verify this methods on different scanners for examples. Analysis of scanner reaction based on image processing is covered in a first section. It is shown that an Electronic Speckle Interferometer (ESPI), a Scanning Laser Doppler Interferometer (SLDI) and a phase shift interferometer are suitable for measuring different motion characteristics. The SLDI is used for rapid measurement of FRF at a large number of locations at the scanner. A phase shift interferometer with stroboscopic illumination has been utilized for measuring the deformation of scanners operating them at resonant frequency. Measurement of static displacement and of thermal deformation is the main application of ESPI technique and shown on the example of a galvanometric scanner. A next section is dedicated to functional tests and to qualification of methods for wafer level test. The application of a tilt angle measuring set up containing a position sensitive semiconductor device and a laser diode and of a laser Doppler interferometer is analyzed. Measurement of resonant frequencies in an early production state is the topic of a third section. It provides information about geometry properties of the scanners suspension and about mechanical stress inside suspending torsion or bending beams. Moreover it enables selection of scanner chips with characteristics which do not meet the specification and the cost for packaging of this bad dies is saved.

Paper Details

Date Published: 19 January 2007
PDF: 12 pages
Proc. SPIE 6463, Reliability, Packaging, Testing, and Characterization of MEMS/MOEMS VI, 64630H (19 January 2007); doi: 10.1117/12.700641
Show Author Affiliations
Steffen Kurth, Fraunhofer Institute for Reliability and Microintegration (Germany)
Christian Kaufmann, Chemnitz Univ. of Technology (Germany)
Ramon Hahn, Chemnitz Univ. of Technology (Germany)
Jan Mehner, Fraunhofer Institute for Reliability and Microintegration (Germany)
Wolfram Dötzel, Chemnitz Univ. of Technology (Germany)
Thomas Gessner, Fraunhofer Institute for Reliability and Microintegration (Germany)
Chemnitz Univ. of Technology (Germany)

Published in SPIE Proceedings Vol. 6463:
Reliability, Packaging, Testing, and Characterization of MEMS/MOEMS VI
Allyson L. Hartzell; Rajeshuni Ramesham, Editor(s)

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