Patent ID: 8854625
Filing Date: 2014-10-07
Classification: B08B,G01N,H01J,Y10T

Abstract:
1. A particle monitoring apparatus comprising: a housing disposed on a gas exhaust line; a laser beam source for emitting a laser beam to particles in the gas exhaust line; a window member disposed at the housing for monitoring the particles in the gas exhaust line, wherein the window member includes: a transparent base which is formed of a transparent resin or glass containing silicon; and a surface treatment layer having one surface formed on a surface of the transparent base, said surface treatment layer further having a gas contact surface disposed on an opposite side of said surface treatment layer to said one surface, and wherein said gas contact surface is in contact with a gas in the gas exhaust line, wherein the surface treatment layer contains one material selected from the group consisting of yttrium and calcium fluoride, and wherein the surface treatment layer is formed of a single layer.