In-situ Metrology Using Robotic Control of Fringe Reflection Measurement System

Aspheric and conformal optics have become critical components in the aerodynamic features of missiles and aircraft systems. The smooth and sleek shape of the optics improves the aerodynamic quality and performance. These shapes are difficult to manufacture and measure due to the significant amount of inherent optical aberrations. However, production of the component requires metrology feedback on the surface figure to ensure quality of the dome or window. This process is time-consuming, error prone, and potentially damaging to the part due the amount of manual handling required.Optimax proposes solving the metrology and manufacturing problem by combining fringe reflection measurement technique, and robotic deterministic polishing. Fringe reflection measurement technique (also known as deflectometry) is a robust non-contact, high resolution, non-interferometric method to measure surface figure. Its required hardware is significantly less expensive and more flexible than standard phase shifting interferometers. In addition, deflectometry can measure surfaces with larger slope deviation than interferometry and can more easily (and in a less expensive manner) measure large components.