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Transfer matrix method for precise determination of thicknesses in a 150-ply polyethylene composite material

: Palka, N.; Krimi, S.; Ospald, F.; Beigang, R.; Miedzinska, D.


Institute of Electrical and Electronics Engineers -IEEE-:
40th International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz 2015. Vol.2 : Hong Kong, China, 23 - 28 August 2015
Piscataway, NJ: IEEE, 2015
ISBN: 978-1-4799-8273-8
ISBN: 978-1-4799-8272-1
International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz) <40, 2015, Hong Kong>
Fraunhofer IPM ()

The multilayer structure of an ultra-high molecular weight polyethylene composite material was investigated in the terahertz (THz) spectral range by means of time domain spectroscopy (TDS) technique. Such structures consist of many alternating layers of fibres (~150), each being perpendicular to the other and each having a thickness of about 50 μm. A transfer matrix method (TMM) and a time-domain fitting procedure were used to determine thicknesses of all layers of the composite material with high accuracy.