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Micro-optical sensor system for birefringence characterization of textile-fibers

: Zeitner, U.; Kaufmann, S.; Kley, E.-B.


Kley, E.-B. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Lithographic and micromachining techniques for optical component fabrication II : 3 - 4 August 2003, San Diego, California, USA
Bellingham/Wash.: SPIE, 2003 (SPIE Proceedings Series 5183)
ISBN: 0-8194-5056-1
Conference "Lithographic and Micromachining Techniques for Optical Component Fabrication" <2, 2003, San Diego/Calif.>
Fraunhofer IOF ()
polarization; birefringency; micro-optical polarizer array; subwavelength grating

We report a micro-optical sensor system for the on-line characterization of the textile-fiber birefringence in spinning machines. The measurement set-up is using the method of Senarmont but does not require any moving parts in the optical path. This has been achieved by usage of different micro-optical elements in combination with optical fibers for illumination and signal capturing. One of the key-components is an array of micropolarizers made of subwavelength-period metal-stripe gratings fabricated by e-beam direct writing and ion-beam etching. Having a total height of only 6mm the sensor system is extremely flat and thus applicable also in special spinning equipment.