夹持点涨落对棉纤维长度测量的影响

采用计算机模拟的方法,分析了夹持点涨落对测量棉纤维长度的影响。模拟结果表明,基于照影仪曲线测量棉纤维的长度分布是困难的,因为需要照影仪上每个测量点的平均误差不超过0.08%;对主体长度、品质长度、短纤维率和平均长度,在一定条件下可以准确测量。在50 000根的抽样空间里,它们的重复性在95%的置信水平,有很好的重复性。实验发现在相同抽样空间,品质长度和平均长度的方差较小,其中平均长度即便在2 000根的抽样空间,它的重复性也可达到0.83 mm。

Effect of randomly holding point on cotton length measurement

Computer simulation is put up to analyze the effect of randomly holding points on cotton length measurement. The simulation results show that it is difficult to measure cotton length distribution by means of fibrograph because the average error on every point of measurement should be no larger than 0.08 %. The staple length, quartile length, short fiber content and mean length can be obtained under certain circumstances. Their reproducibility is quite good with the confidence of 95% when 50 000 pieces of fiber sampling are conducted. It also shows that the variances of quartile length and mean length are smaller in the same range of sampling, and the reproducibility of mean length is 0.83 mm even when only 2 000 pieces of fiber sampling are performed.