A system can use light to analyze a sample dimensionally, for example via shadow moiré analysis. The system can apply convection to heat the sample during analysis. A platform of the system can support the sample during convection-based heating. The system can include nozzles that are arranged circumferentially about the platform. The nozzles can have openings oriented towards the platform to emit heated air towards the sample, to heat the sample. Members such as fins or posts within each nozzle can diffuse or spread the emitted air.