中文摘要：

在光散射颗粒测量中,逆向傅里叶变换技术具有测量下限小和对透镜口径要求低等优点,其缺点是要求满足光束近轴和窄测量区条件.为了实现逆向傅里叶变换技术在在线中应用,提出了一种光线传输计算模型,即在不同的测量区厚度和光束张角情况下计算探测器上散射光信号分布,并与常规的傅里叶变换系统比较,研究测量区厚度和光束张角等因素对逆向傅里叶变换技术光散射信号的影响.数值计算表明,逆向傅里叶变换系统中的信号分布与测量区厚度、等效焦距和入射汇聚光束张角的选择密切相关.所提出的光线传输计算模型可为逆向傅里叶变换系统的在线测量应用提供理论依据.

英文摘要：

The reverse Fourier optics（RFO） in light scattering based particle analyzer has advantages of being able to measure smaller particles and allowing a less size of lens than the conventional Fourier system（CFS）.The drawback is that particles must be located close to the principal optical axis and only a small path length is allowed for the particle stream.This results in the difficulty of its application in online measurements.A mathematical model on the basis of ray propagation,which is used to calculate the scattering signals of RFO was presented.The influences of the path length and beam aperture on signals of RFO were studied by making a comparison with those on signals of CFS.Numerical results show that the RFO signal is closely dependent on the path length,the beam aperture and the focal length.The study exploits a possibility for the online application of RFO.