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Speed-up chromatic sensors by optimized optical filters

: Taphanel, M.; Hovestreydt, B.; Beyerer, J.

Postprint urn:nbn:de:0011-n-2645324 (543 KByte PDF)
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Copyright Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.
Erstellt am: 15.5.2014

Lehmann, P.H. (Ed.) ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Optical Measurement Systems for Industrial Inspection VIII : 13.-16.5.2013, Munich, Germany
Bellingham, WA: SPIE, 2013 (Proceedings of SPIE 8788)
ISBN: 978-0-8194-9604-1
Paper 87880S
Conference "Optical Measurement Systems for Industrial Inspection" <8, 2013, Munich>
Konferenzbeitrag, Elektronische Publikation
Fraunhofer IOF ()
interference filter optimization; thin film filter; inline 3D sensor; high-speed measurement

The probably best known chromatic sensor is the chromatic confocal point sensor, which is an optical displacement sensor (depicted in Fig. 1). It uses different wavelengths to encode the distance and has one measurement spot. Beside this prominent example, there are plenty of other realizations. E.g. Lee lists fiber optical sensors which measure temperature, displacement, current, strain and more. A variant of the chromatic confocal point sensor is used within this paper as example to apply the proposed method, referred to as CCT (chromatic confocal triangulation) sensor. In contrast to the point sensor the CCT sensor has many measurement spots next to each other (typically 2000 measurement spots in a row).