羽绒残脂率测定结果的不确定度评定

为反映实验室残脂率检测结果的可靠程度，采用测量不确定度的直接评定方法对羽绒残脂率的测量结果进行不确定度评定。根据羽绒残脂率测试原理，分析得出其测量结果的不确定度来源主要为测量的重复性、样品质量的称量、残脂的称量；进而对各分量分别进行了评定，计算出了羽绒残脂率的合成标准不确定度和扩展不确定度。分析结果表明：使用分辨力为1 mg的天平，烧瓶称量产生的不确定度是残脂率不确定度的最主要来源，且合成不确定度较大；使用分辨力0.1 mg的电子天平称取烧瓶，则其产生的不确定度和测量重复性产生的不确定度是影响残脂率总不确定度的主要分量。

Uncertainty evaluation for testing results of fat and oil content of downs

To affirm the reliability of testing result, the direct evaluation method was used to evaluate the uncertainty of fat and oil content of feather and down in this paper. The repeatability of sample measurement, sample weighing, fat and oil weighing were proved to be the main sources of uncertainty of fat and oil content by analysing the principle of measurement of fat and oil content. All components were evaluated respectively. The combined standard uncertainty and the expanded uncertainty were calculated by combining all the components of uncertainty. The analysis result shows that the uncertainty from weighing flasks is the prime factor while weighing flasks by the balance of 1 mg resolution which causes the higher uncertainty, and that the uncertainty from the repeatability of sample measurement and fat and oil weighing are the most important factors for the measurement uncertainty of fat and oil content when weighing the flasks by the balance of 0.1 mg resolution.