The ABT4610 laser offset gauge is designed to allow height and distance offset readings to be taken from the running rails to a desired object or position, such as a platform or datum plate.
Height and offset values are displayed on a PDA, providing the operator on track or site with precise measurements for the given position. These values are calculated from measurements taken by a laser and inclinometer, which are fitted to the gauge. The technique used to calculate the height and offset values enables objects to be measured even when they are below rail level.
Constructed from lightweight GRP and nylon, ensuring insulation from the track circuit. With a tool weight of 8kg, setup time is completed by one person in less than 30 seconds. The vertical and horizontal sections are unfolded and then clamped into position, after which the measurement laser is attached. The datum laser gauge measures height and distance offsets using the measurement laser, which has five location holes on the vertical and horizontal arms of the gauge. By measuring an object from at least two of these positions, the PDA software calculates the height and distance offset of the object or location relative to the running edge of the rail.
An inclinometer is housed within the horizontal arm of the gauge, and readings taken from this, in conjunction with the laser data, enable the software to calculate the track’s super-elevation. This calculation can then be used for platform gauge work. Once the data is input into the PDA, it is saved to a file and can be downloaded to a PC, where it is stored as a permanent record of the survey.
For faster measurements or when measuring bridge arches, a second laser can be employed to locate the positions of non-fixed points.
