Optical device for measuring the optical properties of materials

An optical device for measuring optical properties of materials including at least one of reflected light (BRDF) and transmitted light (BTDF) from the material of a sample in all spherical directions of space around said sample, for each spherical direction of incident light, the device comprising:

• a light source,
• a goniophotometer configured to measure at least one of:
• the directions of the incident light in spherical coordinates, and
• the directions of the reflected light in spherical coordinates;
• and
• a multi-sensor imaging device, configured to determine the emission spectrum of incident light from a set of points in the scene observed by the multi-sensor imaging device over a set of layers,
• wherein the goniophotometer is comprised of a cell, said cell comprising:
• a first articulated arm in three dimensions of space and configured to support the light source;
• and
• a second articulated arm in three dimensions of space and configured to support the sample or a sample holder;
• and
• wherein relative orientations of the first articulated arm and the second articulated arm are controllable.