Contactless measurement of electric railway wire height and position - involves using photoelectric sensors in shadow graph system

摘要

The two photoelectric sensors are mounted in two housings on a spacing bar on the roof of a rail vehicle, and they are mounted at a fixed distance from each other form a certain angle, pref. 90 deg. and an electronic data processing unit receives signals from the two photoelectric sensing systems as in 2440085. The device can be used for continuous measurement of the thickness of the contact wire (9) by measuring the width of the shadow of the wire thrown on the photoelectric receivers, and hence the thickness of the wire in two directions 90 deg. apart is determined. The photoelectric sensors consist of arrays of photodiodes and lenses to focus images of the wire onto the arrays.