JiSMART2022—011: Experimental Study on Spectral Properties of Retro-Reflective Coatings

Abstract

Retro-reflective coatings (RR-coatings) received much attention due to it could reflect the solar radiation along the incident direction, which was different with the traditional highly-reflective coatings (HR-coatings) with the property of diffuse reflection. For the purpose of optical properties optimization and building application improvement, the spectral characteristics of glass bead RR-coatings and prism RR-coatings were measured. The integrating sphere was used to measure the global reflectivity, and a self-developed instrument to measure the angular distribution at different incident angles. The result showed that the global- reflectivity of glass bead RR-coatings and prism RR-coatings were 64.74% and 51.44%, respectively. However, the retro-reflectivity of prism RR-coatings was higher than glass bead RR-coatings at the smaller incident angles with the values of 25.22% and 21.67%, respectively (at 10◦ and 30◦ of incidence). For larger incidence angles including 50◦and 70◦, two RR-coatings mainly showed specular-reflection property