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Method and apparatus for mesuring the physical characteristics of materials in motion using coherent light source with heterodyn sensing of the reflected or scattered light from the materials
Process and apparatus for measurement of physical parameters of moving matter by means of coherent light source,by heterodyne detection of light reflected or scattered by moving matter
Verfahren zum messen des abriebes eines oder mehrerer an einem rotierenden koerper anliegender flaechenteile eines anderen feststehenden koerpers und vorrichtung zur durchfuehrung des verfahrens