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Proceedings Paper

Main limitations in infrared temperature measurement of train hot points
Author(s): Francisco Javier Meca Meca; Francisco Javier Rodriguez Sanchez; Manuel Mazo Quintas; Jose Antonio Jimenez Calvo; Diego Lillo Rodriguez; Pablo Ramos Sainz
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Paper Abstract

Nowadays, in order to guarantee the security in passenger and goods railway transport, fixed systems located in rails are used to measure axles, wheels and brake discs temperatures during train circulation so that abnormally high temperatures as a result of a malfunction can be detected. Measurement systems in this kind of application may be affected by different uncertainty sources, characteristic of infrared temperature measurements, which limit the accuracy of the estimated measurement. Uncertainty sources are specially important in these applications due to: (1) Extremely variable emissivity as a result of stain or different paints used on the surfaces. (2) Difficult evaluation of the environment's radiation as measurements are made outdoors. (3) Alarm temperatures are only about 40 degrees Celsius to 80 degrees Celsius above the environment temperature. The paper analyses the effects of these uncertainties. The results show that, in order to get the minimum uncertainty peaks in the estimated temperature, the proper duty waveband is 3 - 5 micrometer. They also show that, with a proper choice of the wavelength, the uncertainty due to solar radiation remains masked by the uncertainty due to the lens emissivity.

Paper Details

Date Published: 9 June 2000
PDF: 9 pages
Proc. SPIE 3995, Nondestructive Evaluation of Highways, Utilities, and Pipelines IV, (9 June 2000); doi: 10.1117/12.387811
Show Author Affiliations
Francisco Javier Meca Meca, Univ. of Alcala (Spain)
Francisco Javier Rodriguez Sanchez, Univ. of Alcala (Spain)
Manuel Mazo Quintas, Univ. of Alcala (Spain)
Jose Antonio Jimenez Calvo, Univ. of Alcala (Spain)
Diego Lillo Rodriguez, Univ. of Alcala (Spain)
Pablo Ramos Sainz, Univ. of Alcala (Spain)


Published in SPIE Proceedings Vol. 3995:
Nondestructive Evaluation of Highways, Utilities, and Pipelines IV
A. Emin Aktan; Stephen R. Gosselin; Stephen R. Gosselin, Editor(s)

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