A charge-coupled device (CCD) infrared imaging sys-tem
Chapter 12, Problem 12.86(choose chapter or problem)
A charge-coupled device (CCD) infrared imaging sys-tem (see 12.85) operates in a manner similarto a digital video camera. Instead of being sensitive toirradiation in the visible part of the spectrum, how-ever, each small sensor in the infrared systems CCDarray is sensitive in the spectral region 912?m. Notethat the system is designed to only view radiationcoming from directly in front of it. An experimenter wishes to use the infrared imaging system to map thesurface temperature distribution of a heated object in a wind tunnel experiment. The air temperature in thewind tunnel, as well as the surroundings temperaturein the laboratory, is 23C.(a) In a preliminary test of the concept, the experi-menter views a small aluminum billet locatedin the wind tunnel that is at a billet temperatureof 50C. The aluminum is coated with a high-emissivity paint, ?? 0.96. If the infrared imagingsystem is calibrated to indicate the temperature ofa blackbody, what temperature will be indicatedby the infrared imaging system as it is used toview the aluminum billet through a 6-mm- thickfused quartz window?(b) In a subsequent experiment, the experimenterreplaces the quartz window with a thin (130-?m-thick) household polyethylene film with ??0.78within the spectral range of the imaging system.What temperature will be indicated by the infraredimaging system when it is used to view the alu-minum billet through the polyethylene film?
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