Method of monitoring a production process using a linear combination of measured variables with selected weights
First Claim
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1. A method of monitoring a production process, which comprises:
- determining intensities of various wavelengths in an emission spectrum at predefined times;
forming at least one linear combination from the intensities of various wavelengths, and selecting weights of the linear combination such that a predefined curve shape is approximated; and
determining at least one characteristic variable from the linear combination.
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Abstract
The invention relates to a method for monitoring a manufacturing process, which by using a linear combination of measured variables with judiciously chosen weighting, produces a suitable (optimal) signal for determining each parameter. The extraction of the parameters from the measured variables is thus greatly simplified and in many cases becomes actually possible for the first time. According to the invention, large amounts of data may now be prepared, such that the crucial information (parameters) can be obtained from the data, almost in real time, or in real time.
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Citations
20 Claims
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1. A method of monitoring a production process, which comprises:
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determining intensities of various wavelengths in an emission spectrum at predefined times; forming at least one linear combination from the intensities of various wavelengths, and selecting weights of the linear combination such that a predefined curve shape is approximated; and determining at least one characteristic variable from the linear combination. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A method of monitoring a production process, which comprises:
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determining intensities of various wavelengths in an emission spectrum of a plasma process at predefined times; forming at least one linear combination from the intensities of various wavelengths, and selecting weights of the linear combination such that a predefined curve shape is approximated; and determining an end point of the plasma process from the linear combination.
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Specification