This work is concerned with an experimenta1 study on online measurernent ofthe states gf D saw blade cutting a 12-inch crystal ingot. An online monitoring system consisting of a 3-axis gi,e:?,ei.,c,tn' :,ge.",s,2'i,a,th.r,eg,Za."8dVtr,'.ai,,fi."%ri,.a.,dg'gt,t.a..i.ogcigLoa.po,pe.eq8,c;:;gl,gutej.w,a,s..de{/%igpld6 decomposed in three frequency regions to evaluate the blade extension circurnstance, the sharpqess. of blade edge and the interference between blade and ingot The proposed D-Blade slicer momtormg system is validated for evaluation of the blade slicing 12-inch silicon ingots.