Microwave Radiometers for Fire Detection in Trains: Theory and Feasibility Study

This paper introduces the theory of fire detection in moving vehicles by microwave radiometers. The system analysis is discussed and a feasibility study is illustrated on the basis of two implementation hypotheses. The basic idea is to have a fixed radiometer and to look inside the glass windows of the wagon when it passes in front of the instrument antenna. The proposed sensor uses a three-pixel multi-beam configuration that allows an image to be formed by the movement of the train itself. Each pixel is constituted by a direct amplification microwave receiver operating at 31.4 GHz. At this frequency, the antenna can be a 34 cm offset parabolic dish, whereas a 1 K brightness temperature resolution is achievable with an overall system noise figure of 6 dB, an observation bandwidth of 2 GHz and an integration time of 1 ms. The effect of the detector noise is also investigated and several implementation hypotheses are discussed. The presented study is important since it could be applied to the automatic fire alarm in trains and moving vehicles with dielectric wall/windows.


  • English

Media Info

  • Media Type: Web
  • Features: References;
  • Pagination: p 906
  • Serial:
  • Publication flags:

    Open Access (libre)

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Filing Info

  • Accession Number: 01611867
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Aug 25 2016 3:56PM