DEVICE DETERMINING LATERAL DISPLACEMENTS Russian patent published in 1996 - IPC

FIELD: geodetic instrumentation. SUBSTANCE: part of output radiation of converter 3 goes to input of reference photodetector 5 through first beam splitter 4. Output of photodetector is coupled to reference input of processing unit 11. Other part of radiation is directed into second converter 6 which forms two pairs of orthogonally polarized converging beams arranged in orthogonal planes forming two orthogonally positioned interference pictures in measurement zone read by proper photodetectors 13, 14 with mutually orthogonal analyzers 15, 16. EFFECT: provision for simultaneous measurement of two lateral components of displacement of objects due to simultaneous formation of two interference pictures in measurement zone positioned orthogonally. 3 cl, 1 dwg