事例研究
市販スキャナを使った測長システムの測定の不確かさの評価
－2次元測長システムへのJIS Z 9090の活用－
2010 年 18 巻 3 号 p. 92-99
詳細
2010 年 18 巻 3 号 p. 92-99
In a measurement system consisting of a commercial scanner and an in-house analysis program, JIS Z 9090 (Measurement-General rules for calibration system) was applied to calculate usage uncertainty, calibration uncertainty, and standard reading uncertainty and obtain a combined standard uncertainty. On the basis of the results, the current calibration system was validated by comparing its calibration interval and adjustment limits with the optimal calibration interval and adjustment limits. In this system, a 0.2-mm thick PET sheet is used as a standard. It was found that the standard reading uncertainty was too high to be ignored. It was also found that in the measurement of diagonal lines, usage uncertainty was high enough to raise problems. The cause was found to be the large effect of the angle at which the sample was placed on the platen, which is an error factor. Countermeasures are lacking at present.
