Uni-axis range finder using contrast detection of a projected pattern

摘要

Many methods have been proposed for rnage finding systems to know the distance of the targets. We try to capture profiles of objects in addition to the distance of objects using optical principle. When a grating pattern is projected on to the oject to be measured, the projected pattern is sharply observed on a focused plane. And the pattern blurs due to defocusing except on this focused plane. We detect contrast variation of the projected grating pattern and calculate the distance to the object and captures its shapes at the same time. This method features in using merely one optical axis in range finding system.