The study of experimental results of scattering light compared to brdf simulation for the measurement system design of particle size on surface of components of hard disk drive

This work aims to obtain the well-implemented measuring system to characterize particle of sizes ranged from 200-600 nm, type of SiO₂ [1], on surface of Lubricant (n_D²⁰) recording media [2], at 635 nm of wavelength of incident light. The system has an incident and reflective angles at 89 which is based on the principle of Mie scattering theory [3]. Moreover, the intensities of scattered light from simulations based on BRDF_part [4] are compared to the results of experiments from David W. Hahn [5]. For the conclusion, the system based on our design will be implemented to measure the particle sizes and types accurately and efficiently.