Patent ID: 8567084
Filing Date: 2013-10-29
Classification: G01B

Abstract:
1. A profile measuring instrument comprising: a probe having a measurement unit for measuring an object; a movement mechanism that moves the probe; and a controller for controlling the movement mechanism, the measurement unit being moved along a surface of the object to measure a profile of the object, the controller comprising: a compensation-amount calculating unit that calculates a compensation amount for compensating an error in a position of the measurement unit caused by a scanning movement of the probe; and a compensator that compensates the error in the position of the measurement unit based on the compensation amount calculated by the compensation-amount calculating unit, the compensation-amount calculating unit calculating: a translation-compensation amount for compensating a translation error of the probe at a reference point that is set to the probe; and a rotation-compensation amount for compensating a rotation error of the probe based on a rotation angle of the probe around the reference point and a length of the probe from the reference point to the measurement unit, wherein at least one of the translation-compensation amount and the rotation-compensation amount is calculated based on a rotation frequency of the scanning movement of the probe.