Apparatus and method for inspecting the inner surface of a tubular structure for contamination

摘要: A method for inspecting the inner surface of a tubular structure contamination comprises emitting light beam directed onto at first end thereof, wherein is predetermined glancing angle such that it repeatedly reflects off along length thereof. The further receiving reflected second structure. still measuring value reflectance received beam, defining parameter using measured value, and comparing with threshold value. determining, based on comparison, extent to which contaminated, displaying an indication representative determination. An apparatus performing also provided.