Patent ID: 6785010
Filing Date: 2004-08-31
Classification: B08B,B24B,G01B

Abstract:
A method of measuring a thickness of a film on a substrate, said method comprising:supplying a jet of light-transmitting liquid through a nozzle towards the film, the nozzle being positioned so as to form a gap between a distal end of the nozzle and a plane of a polishing surface for polishing the film; emitting light from a distal end of at least one optical fiber arranged within the nozzle so that the light travels through the light-transmitting liquid towards the film and is reflected by the surface of the film, the distal end of the nozzle being closer to the film than the distal end of the at least one optical fiber; receiving the light reflected from the film and passing through the light-transmitting liquid into the at least one optical fiber arranged within the nozzle; and measuring the thickness of the film based on the light reflected by the film.