As a prototype to develop a small track measurement device that uses the "Inertial Mid-Chord Offset Method," or an inertial method, and can output distortion free waves measured by the mid-chord method, we manufactured an operation unit composed of a sensor unit that can be mounted on a truck and a stable high-precision processing unit. We implemented running tests of an inspection car mounted with this device to check its measurement precision and proved that level of its measurement errors was the same as that of the current inspection car at 20km/h or over.

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