Patent ID: 6841032

Claim:
A plasma processing apparatus for processing an object arranged within a chamber by utilizing the plasma generated inside said chamber, said apparatus comprising: a sensor having an array of a plurality of elements for detecting a plurality of strip-like beams, and having plural lines substantially in parallel along each of which a row of said plurality of elements is aligned; an application device for applying the plurality of strip-like beams respectively having different wavelengths generated from the light within said chamber on the plural lines of said plurality of elements; and a controller adjusting the operation of said apparatus using outputs from said sensor, wherein directions of lines of said plurality of elements, for adjacent elements, are crossing, and said sensor detects one of said strip-like beams in a manner so that at least one of the plurality of the strip-like beams respectively having different wavelengths makes angles with respect to the direction of said plural lines, extending on at least portions of at least two adjacent ones of said plural lines.