Abstract
An error elimination method for surface shape measurement results obtained using the grating projection method is proposed to establish a precise surface shape measurement method for space structures with a high spatial resolution. By measuring the surface shape of a spherical mirror model, it is clarified that measurement errors can be divided into systematic errors depending on the projected grating patterns and random errors, which are affected by the optical properties of the object and the measurement system. Proposed is an error elimination method incorporating bandpass filter to remove the systematic errors and averaging procedures to reduce the random errors. By demonstrating the surface shape measurement of a spherical mirror model and a white plate model, it was shown that the proposed method can remove measurement errors by more than 50%. The effectiveness of the proposed method is presented by the results.
