PHOTOELECTRIC METHOD MEASURING DISPLACEMENT Russian patent published in 2003 - IPC

FIELD: measurement technology. SUBSTANCE: invention can find use in laser devices intended to measure displacement, rectilinearity of axes and structures of technological systems. Technical result of invention consists in increase of measurement precision thanks to elimination of influence of inhomogeneity of radiation intensity in time and to suppression of influence of autogeneration emerging between laser and photodetector. In correspondence with proposed method luminous flux of radiator is directed through optical system on to position-sensitive photodetector anchored on stand. Photodetector signal is used to make judgment on displacement of object. Characteristic feature of method consists in formation of light beam with cross-section ensuring generation of round light spot on surface of position-sensitive photodetector and in its direction towards plane of light-sensitive surface of position-sensitive photodetector at angle which excludes reflected beam from hitting radiator back to raise measurement precision and to liquidate amplitude-phase fluctuations of light beam. Beam reflected from position-sensitive photodetector is directed on to additional photodetector which output signal is used to record instability of intensity of luminous flux of radiator. EFFECT: increased measurement precision of method. 4 dwg