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Measurement of aspheric surface
   The characteristics of non spherical element itself determines its surface shape precision demand is very high, it is very important for processing, the inspection precision to the production and scientific research. Manufacturing aspherical experienced glass grinding method, glass molding method, complex method, today has developed to the use of large plastic molding. Along with the computer, mechanical, electronic and technological progress, and the emergence of ion beam machining, electronic beam machining, CNC grinding polishing method of special machining technology. To meet the special needs of the design and processing of non spherical lens is no longer any problems. The test problems fell increasingly become the popularization and application of aspheric need good study and solve a problem
 The relevant classification
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