Detecting pole position by Laser Doppler Distance-Measuring Device
Takefumi SHIMADA, Tadashi KOHIDA, Yuusuke SATOH
Detecting the pole positions on overhead contact lines of electric
railway is important in comparing measuring data by electric inspection
cars or commercial cars in reference to the measuring places. Now, pole
positions are detected on the electric inspection cars using program method
with optical pole detector and distance pulse generator installed at wheel
axle. This method has drawback in that frequent errors occur running on
bridges and that detection fails in tunnels, and that distance pulse fails
to generated on account of sliding wheels. We developed a new pole position
detecting system using a laser doppler distance-measuring device and a
position detector of ATS beacon. Tests at RTRI made it clear that the laser
doppler device using two optical sensors could measure the distance exactly.
Successive test results using the electric inspection cars show that this
device could measure the running velocity and distance when added with an
interpolate function, and we confirmed the effectiveness of this system.