MEASUREMENT JIG, THREE-DIMENSIONAL MEASUREMENT SYSTEM, AND THREE-DIMENSIONAL MEASUREMENT METHOD

To three-dimensionally measure a protrusion such as a seal fin that linearly extends easily with good accuracy.SOLUTION: A measurement jig 30 pertaining to an embodiment of the present invention is attachable to a probe 21 which can be used when bringing a convex contact face 22a of a probe 21 into contact with a contact point at the tip of a protrusion 17 of a measurement object that extends linearly and measuring the three-dimensional position of the contact point at the tip of the protrusion 17. The measurement jig 30 comprises: a guide part 31 that can be arranged sandwiching both sides of the protrusion 17 while the measurement jig 30 is attached to the probe 21; and a holding part 32 that holds the measurement jig 30 to the probe 21 integrally with the guide part 31 while the measurement jig 30 is attached to the probe 21. The contact point at the tip of the protrusion 17 can be brought into contact with the convex contact face 22a of the probe 21 while the measurement jig 30 is attached to the probe 21.SELECTED DRAWING: Figure 6 【課題】シールフィンなどの線状に延びる突起部の３次元計測を精度よく容易に行う。【解決手段】実施形態に係る計測治具３０は、計測対象物の線状に延びる突起部１７の先端の接触点にプローブ２１の凸曲面当接面２２ａを接触させて突起部１７の先端の接触点の３次元的位置を計測する際に用いることができるプローブ２１に着脱可能である。計測治具３０は、計測治具３０がプローブ２１に取り付けられた状態で突起部１７の両側をはさんで配置可能なガイド部３１と、計測治具３０がプローブ２１に取り付けられた状態でガイド部３１と一体化して計測治具３０をプローブ２１に保持する保持部３２と、を有する。計測治具３０がプローブ２１に取り付けられた状態で、突起部１７の先端の接触点とプローブ２１の凸曲面当接面２２ａとを接触させることができる。【選択図】図６