在可见光范围内,对消光光谱法颗粒测量技术中的病态性问题进行分析,对目标函数的极值情况和反演计算结果进行了计算讨论,并对标准聚苯乙烯颗粒进行了实验测量和反演计算.模拟计算和实验结果表明,在消光光谱法测量中,亚微米级颗粒的病态性表现得尤为严重,目标函数极值情况和反演结果对误差非常敏感,反演结果的稳定度和准确度较差.为保证测量结果准确性,应尽可能减小测量误差.微米级颗粒对应的目标函数极值情况和反演计算结果则较为理想.

In the visible light region,the ill- condition problem in particle size measurement based on spectral extinction technique is analyzed.By analyzing the results of objective function and inversion results,the influence of the ill-condition problem on spectral extinction method is discussed.The experiments are performed with standard polystyrene particles and the particle size distribution is inversed.Both simulation and experimental results show that the ill-condition problem in spectral extinction measurement is serious for the submicron particles.The situation of objective function extremum and inversion results are sensitive to error,leading to the poor stability and accuracy of the inversion results.To ensure the accuracy of the particle size measurement,measurement error should be minimized.In contrast,the situation of objective function and inversion results for micron particles is much better than for submicron particles.