Patent ID: 8377503

Claim:
A method for real-timely monitoring thickness change of a film, comprising: providing a coating module having a chamber, and a thickness-monitoring module comprising a surface plasmon resonance (SPR) optical fiber sensor, a light source, a light-receiving detector, and a plurality of optical fibers, wherein the optical fibers connect the SPR optical fiber sensor with the light source and the light-receiving detector; the SPR optical fiber sensor has a sensing area and is arranged in the chamber; and the light source provides the sensing area of the SPR optical fiber sensor with light; putting a substrate into the chamber of the coating module; performing a coating process on the substrate while a film is formed on the sensing area of the SPR optical fiber sensor; and utilizing the light-receiving detector to receive signals output from the sensing area of the SPR optical fiber sensor and then to output a signal of a light-intensity change.