Patent ID: 8826853

Claim:
An apparatus for plasma-enhanced chemical vapour deposition (PECVD) of a thin layer of barrier-effect material on an inside wall of a receptacle, said apparatus comprising: a structure that receives the receptacle, comprising at least a yoke and a cover overlying said yoke, said structure defining a plasma-presence zone including: an inside volume of the receptacle and a plasma post-discharge zone outside said receptacle defined by the yoke and closed by the cover, said structure being provided with an orifice defining an axis and presenting an inside opening, opening out into said plasma-presence zone, and an outside opening, opening out outside said plasma-presence zone; an electromagnetic wave generator for activating a plasma; and an optical plasma monitor device comprising: a spectrometer and a pick-up placed outside said plasma-presence zone and connected to said spectrometer; wherein said pick-up is placed on said axis of said orifice so as to be in direct optical contact with said plasma-presence zone, wherein said orifice is formed in a confinement grid of a plasma post-discharge zone, outside said receptacle, and wherein said grid presenting a plurality of holes defining each an axis, the pick-up is integrated in the yoke on the axis of one of the plurality of holes.