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

Claim 13:
14. A method of in-line monitoring a slurry, comprising:
conducting a slurry from a first slurry supply pipe loop to a slurry metrology cell;
impinging a first light beam through an optical chopper on the slurry accommodated in the slurry metrology cell;
impinging a second light beam directly on the slurry accommodated in the slurry metrology cell;
detecting an intensity of the first light beam and an intensity of the second light beam scattered by abrasive particles of the slurry; and
obtaining estimated sizes of the abrasive particles in the slurry based on the intensity of the first light beam and the second light beam scattered by the abrasive particles of the slurry.