Patent ID: 8643849

Claim:
A measurement system, comprising: a light source unit configured to generate a plurality of modulated phase shifted light beams; a projection unit configured to reflect the modulated phase shifted light beams onto an object surface; an optics unit configured to capture the modulated phase shifted light beams from the object surface; a photodetector configured to receive the modulated phase shifted light beams from the optics unit to generate electrical signals; and a processor configured to retrieve position information of the object surface based on the electrical signals from the photodetector, wherein the position information comprises depths or Z coordinates of a point on the object surface along a Z-axis, wherein after the modulated phase shifted beams from the point on the object are detected by the photodetector, intensity pulses are generated in the respective electrical signals, wherein the processor is further configured to: identify positions of maximum values and half maximum valves on the respective intensity pulses, collect point values on sections between the maximum value positions and the half maximum value positions on the respective intensity pulses, and fit the sections based on the collected point values into respective normal curves, and wherein peak values on the normal curves are intensity values of the respective modulated phase shifted beam.