Gonioreflectometric measurements in the mid-wavelength infrared range

A gonioreflectometer for the mid-wavelength infrared range was built to measure the directed emissivity of rough surfaces without contact. Gonioreflectometric measurements were conducted for several surface materials and conditions. Each HDF5 file contains the thermal images for a single camera angle and incident angles from 1° to 90°, with open and closed chopper. For the camera angle of 15°, the data for incident angles from 3° to 87° degree is usable. Usable is the data from 1° to 87° for Camera angles of 20°, 30°, 40°, 45°, 50°, 60°, 70°, 80°, 85°. The thermal images are available as temperature values in °C, radiance value in W/sr/m^2 and digital values. The radiance values are determined via Planck's law. The rotation stage for the integrating sphere turns continuously with 10° per second, and the MWIR camera takes 10 HDR thermal images every second.