METHOD OF CONSTRUCTION OF PROFILES OF THREE-DIMENSIONAL OBJECTS AND DEVICE FOR ITS IMPLEMENTATION Russian patent published in 1997 - IPC

FIELD: design of profiles of three-dimensional objects, physics, laser location, test of lateral and longitudinal profiles of railway structures, metro structures, various viaducts, pipe-lines, mines and mining developments. SUBSTANCE: essence of method lies in discrete laser scanning of space in plane perpendicular to direction of movement of laser with subsequent recording of reflected signal and determination of distance to each point of discrete scanning, on construction of profiles with due account of angular positions of points of discrete scanning and rate of movement. In this case reflected signal is divided during recording into three signals. Two of them are spatially-linearly transformed to videosignals, time interval between them being proportional to range R to object. Power of third signal is measured and when it reaches upper boundary of dynamic range duration of laser pulse is limited and range R is found by formula R=R₁/ (1+R₂R₃h), where h is value proportional to time interval between centers of light marks; R₁,R₂ are coefficients determined as result of calibration; R₃ is coefficient coupled to scale of spatial-linear transformation of photodetector. Device for construction of profiles of three-dimensional objects has pulse laser, synchronization unit, unit for adjustment of duration of laser pulse, data processing unit incorporating input lens and first photodetector, unit forming information on range and computer connected in series, second photodetector with input lens, unit measuring power of reflected signal, measurement discretization unit including rotary mirror, unit stabilizing speed of rotation of mirror and unit synchronizing phase of rotation of mirror and initiation of laser in burst mode, diaphragm with two holes, two optical wedges optically coupled to the latter, all components being mounted on moving means. First photodetector is made extended and digitized. EFFECT: expanded application field. 7 cl, 3 dwg