Patent ID: 8646408
Filing Date: 2014-02-11
Classification: C23C,G01N

Abstract:
1. An in-situ flux monitor system for in-line deposition process with plurality of separate rollers and plurality of moving substrates comprising: a first light source to generate a measuring light beam including a wavelength that can be absorbed by a vapor flux of deposition along a measuring channel; an optic device to create a reference signal by splitting a portion of the measuring light beam, wherein the portion of the light beam, the reference light beam, is directed along a reference channel without passing through the vapor flux; a plurality of optic fibers to direct the measuring channel under a plurality of separate rollers and plurality of moving substrates, wherein the flux pass through the gap between the rollers to the measuring channel; a mounting backbone, wherein the entire system is mounted on the backbone and the backbone is made from material with a very small coefficient of thermal expansion to minimize the possible misalignment due to thermal expansion; a first sensor to measure the attenuation of the measuring light beam; a second sensor to measure the attenuation of the reference light beam; and a measurement module configured to calculate vapor flux density by comparing the attenuation of the measuring light beam and the attenuation of the reference light beam to eliminate the effect of fluctuation of the light source, calculating the absorption from the attenuation, and correlating the absorption to vapor flux density.