Patent Document ID: 9881400
Application ID: 14808230
Patent Status: 1

Claim One:
1. A method for measuring a high accuracy height map of a test surface using a multi sensor optical profiler, the optical profiler including a low resolution pre-map sensor and a high resolution optical profiling sensor having a resolution higher than a resolution of the low resolution pre-map sensor, comprising: measuring a coarse height map of the test surface with the low resolution pre-map sensor at at least one of a working distance longer than a working distance of the high resolution optical profiling sensor and a field of view larger than a field of view of the high resolution optical profiling sensor; storing the coarse height map in a memory; subdividing the coarse height map into sections as appropriate for the field of view of the high resolution optical profiling sensor provided to the optical profiler; calculating corresponding X, Y and Z positions for the high resolution optical profiling sensor with respect to the test surface; calculating, using the calculated X Y Z positions, a trajectory in the X Y Z direction for the high resolution optical profiling sensor with respect to the test surface; moving the optical profiler in the X, Y, Z-direction with respect to the test surface according to the trajectory; and, measuring, with the high resolution optical profiling sensor, a high accuracy height map having a higher accuracy than the coarse height map.