Structured light autocollimator

1) A system (100) for measurement of one or more properties of an optical surface (1), the one or more properties comprising slope, form, and total thickness variation, the system (100) comprising:

• a) a light source (110) configured to generate spatially incoherent light through a spatially encoded structured light pattern, defining a transmission path;
• b) a group of primary optical elements (120) optically coupled to the light source (110) and the optical surface (1), configured to convert the light into angularly encoded light and direct the light to the optical surface (1) such that the angularly encoded light encodes source angles of the optical surface (1), the source angles comprising one or more chief ray angles;
• wherein the optical surface (1) reflects the angularly encoded light back toward the group of primary optical elements (120), defining a reflected path;
• wherein the group of primary optical elements (120) is further configured to collect and focus the reflected angularly encoded light onto an image plane of the group of primary optical elements (120);
• c) an aperture stop (130) located at the image plane, configured to make an object space of the system (100) substantially telecentric such that the one or more chief ray angles are made parallel;
• d) one or more secondary optical elements (140) optically coupled to the image plane, configured to relay the image plane;
• and
• e) a camera sensor (150) optically coupled to the one or more secondary optical elements (140), configured to receive the image plane and measure the one or more properties of the optical surface (1) based on the encoded source angles.