FIELD: measurement technology. SUBSTANCE: for increase of objective of check grid is so projected that dark line crosses main optical axis of projector. Image of grid is so scanned by TV camera that main optical axes of projector and TV camera cross in point on surface of object. Computer compares parameters (coordinates) of check raster obtained in such way with parameters of "imaginary" raster entered into it in advance. EFFECT: improved authenticity of method. 2 cl, 4 dwg
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