OPTICAL SYSTEM INTENDED TO MEASURE BRDF, BSDF AND BDTF

摘要

An optical system (1) intended to measure the BRDF, BDTF and BSDF of a surface (10) of at least a portion of an object (7), the system successively comprising: -an aplanatic lens (2) having an opening angle whereof the absolute value is between 45° and a value strictly lower than 90°, -a convergent field lens (3) downstream from plane P, -an image-taking lens (4) whereof the field angle is greater than or equal to the angle of convergence of the scattered light beams emerging from the field lens, and -a video sensor (5), the aplanatic lens (2), convergent field lens (3), image-taking lens (4) and video sensor (5) being arranged so as to allow a first conjugation C1 between the surface (10) and the entrance pupil of the image-taking lens (4) and a second conjugation C2 between an intensity pattern and the video sensor (5).