Patent ID: 7742163

Claim:
A Integrated Metrology Sensor (IMS) comprising: a compact chassis assembly having a plurality of pre-aligned mounting devices configured for mounting a plurality of calibrated Field Replaceable Units (FRUs) at pre-determined locations, wherein the calibrated FRUs are assembled, aligned, and calibrated to meet a set characterization parameters; a calibrated wafer-positioning FRU removably coupled to the compact chassis assembly and configured for supporting and aligning a wafer; a calibrated high angle focusing FRU configured to provide one or more pre-aligned high-angle incident beams to a target on the wafer, the calibrated high angle focusing FRU being removably coupled to the calibrated wafer-positioning FRU and the compact chassis assembly; a calibrated high angle collecting FRU configured to receive one or more pre-aligned high-angle reflected beams from the target on the wafer, the calibrated high angle focusing FRU being removably coupled to the calibrated wafer-positioning FRU and the compact chassis assembly; a calibrated source FRU removably coupled to the compact chassis assembly and configured to provide at least one pre-aligned high angle input beam to the calibrated high angle focusing FRU; and a calibrated analyzer FRU removably coupled to the compact chassis assembly and configured to receive at least one pre-aligned high angle output beam.