Optical scanning system for quality control of GEM-foils

M. Kalliokoski*, T. Hilden, F. Garcia, J. Heino, R. Lauhakangas, E. Tuominen, R. Turpeinen

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

10 Citations (Scopus)


An optical scanning system was commissioned and further developed in the Detector Laboratory of Helsinki Institute of Physics and University of Helsinki. It was designed to automatically scan, perform on-line analysis and to classify the overall quality of GEM-foils especially of the GEM-TPC detectors for Super-FRS at FAIR. The optical scanning system consists of precision positioning table, lighting, optics and operating system with analysis software. It has active scanning area of 95×95 cm 2 and it can study this area with the minimum resolution of 128 lp/mm. Performance of the system and first results from the GEM-foil uniformity and quality analysis are presented.

Original languageEnglish
Pages (from-to)223-230
Number of pages8
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Issue number1
Publication statusPublished - 1 Feb 2012
MoE publication typeA1 Journal article-refereed


  • Gas electron multiplier
  • Optical scanning system
  • Quality control

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