Numerical investigation of measurement error of the integrating sphere based on the Monte-Carlo method

To accurately measure the directional-hemispherical reflectance of a material surface using an integrating sphere, we investigated the effects of the integrating sphere's interior structure and coating properties on the measured data by numerical simulation. The results showed that the integrating sphere's structure and the reflectance of the coating codetermine the accuracy of the measured results. When the integrating sphere's structure is fixed, choosing an appropriate internal coating using the method proposed in this paper ensures the accuracy of the results. If a proper coating is not available, we propose a method to effectively correct the measured results.