In order to realize sub-aperture stitching measurement of large-aperture optics

a work-piece localization method based on stereovision is introduced. A measurement system is established and its mathematical model

measuring principle and the obtain of the transformation matrix and etc is investigated. First

the measuring principle of the sub-aperture stitching test is introduced

and its requirement to the work-piece localization is analyzed. Then the stereovision measurement system is introduced

its measuring model is established. After that

the marked points’ 3D coordinates which are rigid connected with the optics under test are obtained and the transformation matrix can be solved out by quaternion method. Then

the full-aperture phase map can be synthesized by mathematically minimizing the mismatch among the overlapping areas of all sub-apertures. Finally

a 150mm flat and a 100mm convex sphere are tested using this method. Experimental results indicate that the precision of the system’s translation and rotation measurement are better than 0.1mm and 0.01degree

respectively. This can provide an effective initial value for the stitching algorithm and its measurement error does not cumulative along with the motion in its view field. It can satisfy the system’s precision requirements and it is non-contact

simple

and rapid speed

as well as strong anti-jamming and stabilization.