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Ultraviolet Oxygen Sensor

出版	Aerospace Medical Research Laboratory, Aerospace Medical Division, Air Force Systems Command, United States Air Force, 1969
URL	http://books.google.com.hk/books?id=78-RrW6YSWYC&hl=&source=gbs_api

註釋The Ultraviolet Oxygen Sensor has been developed to quantitatively measure oxygen in a closed atmosphere. The essential elements of the instrument are: the ultraviolet source, an optical chopper, the sample cell, the photomultiplier tube, and the required electronic circuits. No monochromator or optical filter has been used. A Xenon discharge lamp with emission at 1470 angstroms is used with a sample path of 0.125 mm to provide a system sensitive to oxygen and insensitive to other gases found in a closed atmosphere environment. This configuration allows the use of a nondispersive optical system and an optical chopper to provide a double beam system. The oxygen concentration is determined by measuring the amount of energy absorbed through the sample cell. This measurement is compared to a reference signal obtained by directing the ultraviolet beam through an oxygen-free path to the photomultiplier. The electronic ratio of these two measurements results in a stable signal that is independent of variation in the source and detector.