Patent ID: 9564295
Date: 2017-02-07
CPC Classifications: G01J,H01J

Claim:
1. A diagnosis system for pulsed plasma, the diagnosis system comprising: a chamber in which light is to be generated by a reaction between a substrate and the pulsed plasma; a first pulsed RF power supply to provide a first pulsed RF power corresponding to a pulse signal to the chamber; an optical emission sensor (OES) to sense generated light and convert the generated light into an electrical signal; a digitizer to synchronize the electrical signal with the pulse signal; and an analyzer to analyze the synchronized electrical signal, wherein a period of the pulse signal is divided into a pulse-on period and a pulse-off period, and the analyzer is to determine at least one from among a first maximum signal magnitude value defined as the maximum electrical signal magnitude value in the pulse-on period, a first maximum signal time when the first maximum signal magnitude value occurs, a first minimum signal magnitude value defined as the minimum electrical signal magnitude value in the pulse-on period, a first minimum signal time when the first minimum signal magnitude value occurs, a first average signal magnitude value defined as an average of an electrical signal magnitude value in the pulse-on period, a first standard deviation value defined as a standard deviation corresponding to the first average signal magnitude value, a second maximum signal magnitude value defined as the maximum electrical signal magnitude value in the pulse-off period, a second maximum signal time when the second maximum signal magnitude value occurs, a second minimum signal magnitude value defined as the minimum electrical signal magnitude value in the pulse-off period, a second minimum signal time when the second minimum signal magnitude value occurs, a second average signal magnitude value defined as an average of an electrical signal magnitude value in the pulse-off period, and a second standard deviation value defined as a standard deviation corresponding to the second average signal magnitude value.