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Träfflista för sökning "L773:0926 9630 OR L773:9781614995654 ;pers:(Larsson Christer)"

Sökning: L773:0926 9630 OR L773:9781614995654 > Larsson Christer

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1.
  • Ödman, Torbjörn, et al. (författare)
  • A study of different fabrics to increase radar cross section of humans
  • 2015
  • Ingår i: Stud. Health Technol. Informatics. - : IOS Press. - 9781614995159 ; 211, s. 201-206
  • Konferensbidrag (refereegranskat)abstract
    • This purpose of the study was to increase the visibility on radar for unprotected pedestrians with the aid of conducting fabric. The experiment comprised measurements of four types of fabric to determine the radio frequency properties, such as radar cross section (RCS) for the vehicle radar frequency 77 GHz and transmission (shielding) in the frequency range 3-18 GHz. Two different thicknesses of polypyrrole (PPy) nonvowen fabric were tested and one thickness for 30 % and 40 % stainless steel fabrics respectively. A jacket with the thinner nonvowen material and one with 40 % steel were tested and compared to an unmodified jacket in the RCS measurement. The measurement showed an increase in RCS of 4 dB for the jacket with the 40 % steel lining compared to the unmodified jacket. The transmission measurement was aimed at determining the fabric with the highest transmission of an incoming radio wave. The 30 % steel fabric and the two thicknesses of the nonvowen fabrics were tested. One practical application is for example the use of radar reflective material in search and rescue (SAR) clothes. The study showed that the 30 % steel fabric was the best candidate for further RCS measurements. © 2015 The authors and IOS Press. All rights reserved.
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2.
  • Ödman, Torbjörn, et al. (författare)
  • Reflection/Transmission Study of Two Fabrics with Microwave Properties
  • 2014
  • Ingår i: Studies in Health Technology and Informatics. - 0926-9630. ; 200, s. 95-100, s. 95-100
  • Tidskriftsartikel (refereegranskat)abstract
    • In this study, the transmission and reflection of two conductive fabrics are investigated in the frequency range from 2 to 18 GHz. One of the fabrics is a non-woven polypyrrole and the other consists of a polyethylene warp with steel threads in the weft. Reflection and transmission measurements are performed in order to characterize the electromagnetic properties of the materials. Reflection measurements are performed for two polarizations at normal, 0°, and 60° incident angles. Transmission measurements are also done for two polarization directions at normal incidence. The results show that the fabric with the steel filler reflects most of the incident radiation and has very low transmission with some polarization dependence. The polypyrrole non-woven fabric, on the other hand, has reflection and transmission properties that show that it is absorbing the incident radiation. Wearable on-body sensors that in addition are comfortable to wear can be integrated in the textile of clothes. These sensors can eg., be used to monitor health or analyze gait. The fabrics have the potential to be used in health applications when designing on-body sensors, e.g for movement analysis.
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Lindén, Maria (2)
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