Abstract
An apparatus for making two-dimensional photon images of tribomicroplasma in controlled gas pressures was constructed. Using the apparatus, the dimensions, patterns, and photon emission intensities of the tribomicroplasma were investigated under various reduced air pressures when sliding a diamond hemisphere pin on a sapphire disk. It was found that the shapes and patterns of the two-dimensional plane photon images of the tribomicroplasma vary as a function of the air pressure. Two components of the photon image have been distinguished: (1) a small circular image, the shape and the size of which do not depend on the gas pressure, and (2) a larger image in the shape of a ring with a horseshoe pattern with and without tailing. The size of the second component depends largely on the gas pressure. The first component corresponds to photon emission due to frictional heating, while the second one is the image of the tribomicroplasma generated by the gas discharge. As the air pressure decreases, the image of the tribomicroplasma expands and some parts of the image disappear until the tribomicroplasma image disappears completely at an air pressure of about 10 Pa, leaving only the circular frictional contact image. These characteristics have been explained by a gas discharge theory.
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