A novel, non-contact, thermal imaging sensor assembly for continuous bogie monitoring from Rail Vision Ltd

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Train accidents are often due to worn bogie parts (wheels, axles, brakes & bearings)overheating, breaking, & derailing the wagon affected. To identify this heat, Hot Axle Box &Hot Wheel (HABD/HWD) detection units are mounted at the track side. HABD/HWD useinfrared (IR) sensors to makes point based measurements of passing bogie IR radiation, whichis converted into electric voltages & displayed as absolute temperatures. There are limitationswith HABD/HWD, such as sampling of incorrect target points giving inaccurate information,as well as detrimental effects from solar radiation. ~10% of heat derailments occur despite thetrain having previously passed a HABD/HWD – likely an underestimate, as Germany, wheremost EU HABD/HWD are installed, has the highest number of heat-related derailments.The opportunity is for Rail Vision to develop a system to detect heat from bogies via a£582,405, 24-month development of prototype project. This low-cost, undercarriage-mounteddigital thermopile array module (DTAM), coupled to an optical camera, creates a continuousbogie monitoring system (CBMS). The CBMS tracks & records heat, merged with opticaldata from the bogie to provide more accurate information than HABD/HWD, & enablingremote, real-time monitoring (RTM) of the bogie. The CBMS will detect a gradient oftemperature across a cross-section of the component being monitored – to do this, RV willgenerate bespoke algorithms, data communication protocols & software platforms to collect,track & monitor data, & alert. CBMS RTM enables more accurate evaluation of temperatureanomalies than isolated IR HABD/HWD sampling – for customers, this will result in greatersafety of their rolling stock, and maintenance cost improvements. The CBMS supersedesHABD/HWD by monitoring temperature across cross-sections of bogies vs. isolated areas,allowing the user to accurately pinpoint heat anomalies via merging with optical imaging, &tracking & building a history of bogie performance