Patent ID: 7310140

Claim:
A method for inspecting a wafer surface, comprising: loading a wafer into a chamber; irradiating light incident on the wafer including a first light for sensing a position of the wafer and a second light for inspecting a surface of the wafer; detecting the first light reflected on inspection region of the wafer to control the wafer position; detecting the second light scattered on the inspection region to inspect a surface of the inspection region of the wafer, wherein the first and second lights are alternately irradiated, the first light is irradiated before the second light, and control of the wafer position is performed prior to inspecting the surface of the inspection region; transforming the detected first light into a position information signal; obtaining a position compensating value by comparing the position information signal and a reference information signal; generating an electric signal for adjusting a position of the wafer on a basis of the position compensating value; and adjusting the position of the wafer by using the electric signal.