EQUIPMENT FOR LENGTH MEASUREMENT ERROR ESTIMATION OF X-RAY CT APPARATUS FOR THREE-DIMENSIONAL SHAPE MEASUREMENT

• Main Authors: ABE MAKOTO, TAKATSUJI TOSHIYUKI, KISHI TAKETO, FUJIMOTO HIROYUKI, SATO MAKOTO
• Format: Patent
• Language: English; Japanese
• Published: 06.02.2020
• Subjects: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS; MEASURING LENGTH, THICKNESS OR SIMILAR LINEARDIMENSIONS; PHYSICS; TESTING

To provide equipment for length measurement error estimation of an X-ray CT apparatus for three-dimensional shape measurement that does not change the sphere position even when a considerable amount of external force such as a contact of a probe is applied to a sphere or a support rod or even when the equipment is tilted or is turned upside down during movement.SOLUTION: In order to catch the space distortion specific to an X-ray CT apparatus without shortage and evaluate the three-dimensional shape measurement accuracy of the X-ray CT apparatus, in equipment 30, support rods 36, 37, and 38 that have spheres 35 fixed to respective tips and have different lengths are attached to a base 31, thus 15 sphere 35 are arranged in the XYZ space on the base 31. On a flat surface 32 on the upside of the base 31, support rods 36, 37, and 38 that support the spheres 35 and have different lengths are arranged in a predetermined interval. Thus, the spheres 35 are arranged in the XYZ space at an appropriate distance.SELECTED DRAWING: Figure 2 【課題】プローブの接触などの相当量の外力が球や支持棒にかかった場合や、移動時に傾け、あるいは、天地逆とした場合でも、球位置が変化しない三次元形状測定用Ｘ線ＣＴ装置の長さ測定誤差評価用器物を提供する。【解決手段】Ｘ線ＣＴ装置固有の空間歪みを不足なく捉え、Ｘ線ＣＴ装置の三次元形状測定精度を評価するために、器物３０では、先端に球３５を固定した長さの異なる支持棒３６、３７、３８を基台３１に取り付けることで、基台３１上のＸＹＺ空間に１５個の球３５を配置している。基台３１の上部の平坦面３２に、球３５を支持する長さの異なる支持棒３６、３７、３８が所定の間隔で配置される。これにより、球３５は、それぞれ適当な球間距離でＸＹＺ空間に配置される。【選択図】図２