Patent ID: 8976366
Filing Date: 2015-03-10
Classification: G01J,G01N,G02B

Abstract:
1. A measurement system for monitoring a light emitting diode (LED) chip surface roughening process, the measurement system comprising: an objective lens; a reflective illuminator configured to run reflectance measurements; a vertical positioning means to adjust a distance between the objective lens and an industrial sample, the industrial sample including an LED chip; a horizontal positioning means to move objects in XY plane, the horizontal positioning means configured to hold the industrial sample and a reference sample; an optical sensor that acquires images of the industrial sample; a spectrometer that acquires reflectance spectrums of the industrial sample and the reference sample; and a processor that controls the illuminator, the vertical positioning means, the horizontal positioning means, the optical sensor, and the spectrometer, the processor configured to perform deskew, to calculate an average reflectance and an oscillation amplitude from the reflectance spectrums of the industrial sample, and determine a roughness of the industrial sample from the calculated average reflectance and oscillation amplitude.