Patent ID: 11938586
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Measurement (Instruments)
Classification: CPC B  G | IPC B  G

Claim 5:
6. A chemical mechanical polish (CMP) system, comprising:
at least one CMP apparatus;
a first slurry supply unit and a second slurry supply unit supplying a slurry to the at least one CMP apparatus;
a first slurry supply pipe loop connected to the first slurry supply unit and the at least one CMP apparatus, and a second slurry supply pipe loop connected to the second slurry supply unit and the at least one CMP apparatus; and
a slurry monitoring device connected to the first slurry supply pipe loop and the second slurry supply pipe loop, wherein the slurry monitoring device comprises:
a slurry metrology cell, in communication with the first slurry supply pipe loop and the second slurry supply pipe loop, and configured to accommodating the slurry;
a first light source and a second light source; and
an optical chopper disposed between the first light source and the slurry metrology cell,, wherein the first light source emits a first light beam to the slurry metrology cell through the optical chopper, and the second light source emits a second light beam directly to the slurry metrology cell.