An optical system for measuring a measuring target includes an optical apparatus including an illuminant device,an imaging device,and an optical device.The illuminant device generates a measuring light.The optical device including a mirror and an optical splitter is arranged between the illuminant device and the imaging device.The mirror is arranged between the illuminant device and the measurement target,the optical splitter is arranged between the mirror,the measurement target,and the imaging device.The measuring light is projected to the measurement target via the mirror and optical splitter,and an imaging light thar has beem generated from the illuminant device and reflected by the measurement target is projected to the imaging device via the optical splitter,the imaging light and the measuring light intersect at the optical splitter.一種光學系統,用以檢測一待測物體,光學系統包含一光學設備,該光學設備包含一發光裝置、一成像裝置及一光學裝置;發光裝置用以產生一檢測光線;光學裝置位於發光裝置及成像裝置之間,光學裝置包含一反射鏡及一分光鏡,反射鏡設置於發光裝置及待測物體之間,分光鏡設置於反射鏡、待測物體及成像裝置之間。檢測光線經由反射鏡及分光鏡照射待測物體,由待測物體反射檢測光線所形成之一影像光線通過分光鏡傳遞至成像裝置,該影像光線與該檢測光線交會於該分光鏡。1‧‧‧光學系統10‧‧‧光學設備12‧‧‧電腦裝置120‧‧‧顯示器14‧‧‧光接收器2‧‧‧發光裝置20‧‧‧光源模組200‧‧‧發光元件202‧‧‧透鏡組204‧‧‧光型產生件22‧‧‧光源透鏡組4‧‧‧成像裝置40‧‧‧目鏡組44‧‧‧反射件42‧‧‧物鏡組7‧‧‧光學裝置72‧‧‧反射鏡74‧‧‧分光鏡A1‧‧‧第一軸線A2‧‧‧第二軸線O‧‧‧物體
