测量质量浓度的光学粒子计数器的标定方法

Calibration method of optical particle counter applied to measure mass concentration

为了实现光学粒子计数器系统实时精确地测量悬浮颗粒物的质量浓度,对该系统的标定方法进行了研究。首先采用高斯牛顿法进行非线性回归确定标定参数,但实验结果表明标定参数的稳定性较差。其次,通过对稳定性问题的详细分析,发现标定参数与颗粒物质量浓度的范围等因素有关,进而提出了分步标定法。最后,采用分步标定法对粒子计数器系统进行标定,并将其用于实际测量,测量的质量浓度值与实际值吻合较好,证实了分步标定法的有效性。

In order to realize measurement of aerosol mass concentration in real time by optical particle counter,the calibration method of the instrument was studied.Firstly,calibration constants were attained using Gauss-Newton method,but stability of them was poor.Secondly,through a detailed analysis of the stability problem,it was found that calibration constants were related to the range of aerosol mass concentration.Hence,the step calibration method was put forward.Finally,optical particle counter calibrated by the step calibration method was used to measure soot and air.The experimental results validate the step calibration method,demonstrating that measured mass concentrations by the instrument agree well with actual mass concentrations.