基于光阻法的小光束截面粒径信息提取方法

为了实现同时兼顾大、小颗粒测量的液体颗粒计数,在分析细小光束照射下球形颗粒脉冲信号波形特征的基础上,提出了一种颗粒粒径信息提取方法,该方法通过对脉冲信号积分将颗粒脉冲信号的幅度与持续时间结合,可更加准确地提取颗粒的等效粒径信息.对理想脉冲信号进行数值模拟,并采用乳胶微粒标准物质进行实验测试,结果表明,该方法能够有效地提取大颗粒和小颗粒的粒径信息,从而拓宽了仪器检测范围.同时,分析了流速和噪声对该方法提取粒径准确性的影响,结果表明当流速波动小于10%时,测量误差小于5.41%;当噪声小于1%时,测量误差小于0.50%.

Size Information Extraction of Particles Radiated by the Thin Beam in Light Extinction Particle Sizing

In order to measure both large and small particles, based on the analysis of the pulse signal of the spherical particle irradiated by a thin beam, a method for extracting the equivalent particle size information was proposed.This method combines the amplitude and duration of the pulse signal by the integral of the pulse signal, which makes the equivalent particle size information extracted from the pulse signal more accurate.The ideal pulse signal was simulated and experiment was made by using standard polystyrene latex particles.The results show that the method can effectively extract the particle size information of large and small particles, which broaden the detection range.In addition, the effect of flow velocity and noise on the extraction of the particle size was analyzed.When the flow rate is less than 10%, the measurement error is less than 5.4%, and when the noise is less than 1%, the measurement error is less than 0.5%.