Method for Monitoring a Plasma, Device for Carrying Out this Method, Use of this Method for Depositing a Film Onto a Pet Hollow Body
First Claim
1. A method of monitoring the composition of a plasma, said plasma having a plasma emission spectrum, and being generated from at least one defined gaseous precursor for a deposition of a film onto a polymer material, said method comprising at least one measurement of light intensities emitted by said plasma, said method comprising:
- a step of selecting a first wavelength range as a reference range, which is selected from a region of said plasma emission spectrum in which no significant signal can exist, which is characteristic of a parasitic chemical species, that does not form part of said defined precursors and is therefore normally not present in said plasma, and the presence of which in said plasma influences the nature of said film when deposited;
a step of selecting a second wavelength range which is selected from a region of said plasma emission spectrum in which a significant signal characteristic of a parasitic chemical species is likely to exist;
a step of simultaneously acquiring the light intensities emitted by said plasma in each of said first and second selected wavelength ranges; and
a step of calculating, from said light intensities, at least one monitoring coefficient.
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Abstract
The invention relates to a method for monitoring the composition of a plasma, this plasma being generated from determined precursors for depositing a film onto a polymer material. This method involves receiving light intensities emitted by the plasma and comprises: a step for selecting a first reference wavelength range that is selected within a plasma emission spectral region in which no significant signal of a parasitic chemical species can exist, i.e. which is not part of the determined precursors and which is thus normally not present in the plasma and whose presence in the plasma influences the nature of the deposited film; a step for selecting a second wavelength range which is selected within a plasma emission spectral region in which a significant signal of a parasitic chemical species is likely to exist; a step for simultaneously acquiring light intensities emitted by the plasma in each of the two selected wavelength ranges emitted by the plasma in each of the two selected wavelength ranges, and; a step for calculating, on the basis of these light intensities, at least one monitoring coefficient.
11 Citations
15 Claims
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1. A method of monitoring the composition of a plasma, said plasma having a plasma emission spectrum, and being generated from at least one defined gaseous precursor for a deposition of a film onto a polymer material, said method comprising at least one measurement of light intensities emitted by said plasma, said method comprising:
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a step of selecting a first wavelength range as a reference range, which is selected from a region of said plasma emission spectrum in which no significant signal can exist, which is characteristic of a parasitic chemical species, that does not form part of said defined precursors and is therefore normally not present in said plasma, and the presence of which in said plasma influences the nature of said film when deposited; a step of selecting a second wavelength range which is selected from a region of said plasma emission spectrum in which a significant signal characteristic of a parasitic chemical species is likely to exist; a step of simultaneously acquiring the light intensities emitted by said plasma in each of said first and second selected wavelength ranges; and a step of calculating, from said light intensities, at least one monitoring coefficient. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification