On-line Measurement Method of Axisymmetric Optical Aspherical Surface

Abstract

An axisymmetric optical aspheric surface online shape measuring method relates to the field of optical machining. The axisymmetric optical aspheric surface online shape measuring method solves the problem that existing measuring methods require repositioning of workpieces and are low in measuring precision and high in cost. The axisymmetric optical aspheric surface online shape measuring method comprises scheduling the angular speed of an element to be measured as well as the operating speed and the sampling time of an online height indicator working along the generatrix of an aspheric surface; generating a helix sampling point space coordinate matrix, converting the helix sampling point space coordinate matrix into executable files and executing the executable files; performing radius scanning on the generatrix of the aspheric surface from outside to inside through the online height indicator, and performing sampling according to the sampling time to measure out the shape height of the aspheric surface of the element to be measured in the vertical direction; after measurement, obtaining a new shape height of the aspheric surface of the element to be measured in the vertical direction at a designated coordinate through the online height indicator; after finishing the surface scanning, importing the three-dimensional coordinate information of all the sampling points into a computer for analysis, and performing automatic fitting to calculate the shape error information of the aspheric surface. The axisymmetric optical aspheric surface online shape measuring method achieves online measurement, is high in machining precision, reduces repositioning errors and the sampling requirements, saves the time and cost and obtains high efficiency.

Description

technical field [0001] The invention relates to the technical field of optical processing, in particular to an online measuring method for an axisymmetric optical aspheric surface shape. Background technique [0002] With the development of optical technology and the continuous improvement of requirements for optical systems, fewer optical elements, better imaging quality, simpler and lighter optical systems have become the future development direction, and optical aspheric elements that can meet the above requirements are also be more and more widely used. Therefore, higher requirements are put forward for the processing and manufacturing of optical aspheric elements, and it is particularly important to improve the processing efficiency of optical aspheric elements and reduce processing costs. [0003] At present, the manufacture of axisymmetric optical aspheric elements mainly uses numerical control machining centers, and through precise control of the machining position,...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems existing in the existing measurement methods that the workpiece needs to be repositioned, the measurement accuracy is low, and the cost is high, the present invention provides an online measurement method for an axisymmetric optical aspheric surface

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