METHOD OF MEASUREMENT OF LINEAR DIMENSIONS AND FORM OF METALLURGICAL ARTICLES Russian patent published in 1997 - IPC

FIELD: measurement technology. SUBSTANCE: article is scanned by light beam, photoelectric conversion of optical signal when probing light field interacts with surface of article is realized, parameters of signal are measured in time intervals depending on mutual orientation of article and probing field. Configuration of probing light field in region of crossing with surface of article is executed in the form of spatial-periodic amplitude of phase structure with known vector of grid, relative rotation of article and probing field is implemented so that rotation center is located in normal to vector of grid. Angular position of section of rotating article is measured in plane passing through vector of grid and center of relative rotation orthogonally to rotation axis. Translation or velocity of movement of surface of article along vector of grid of probing field is measured by way of measurement of parameters of electric signal in time intervals determined by specified step of angular measurements. Result of measurements of translations of surface along vector of grid is divided by corresponding angular interval. Scanning of article by probing field is carried out in direction parallel to axis of angular rotation. Ratio of linear movement of surface along vector of grid to angular velocity of relative rotation of article is measured and linear velocity of movement of surface is determined by known function of signal frequency in specified internal of angular measurements. Multichannel scanning of outer and inner surfaces is executed. EFFECT: increased accuracy and speed of action while measuring dimensions and forms of metallurgical articles. 1 cl, 3 dwg, 1 tbl