GEAR MEASURING COORDINATES OF BLADES OF ROTATING ROTOR OF HELICOPTER Russian patent published in 2002 - IPC

FIELD: optoelectronic measurement technology. SUBSTANCE: gear has source of optical radiation, luminous flux modulator and optical head incorporating objective lens, photodetector optically coupled to it and connected in series with amplifier, unit processing video signal including units of automatic gain control, of digital information processing, of selection and extraction of coordinate, of indication and information output connected in series. To enhance noise immunity, to prevent its false operation gear is supplemented with subtracter. Unit of digital information processing comes in the form of analog-to-digital converter, storage and digital-to-analog converter connected in series. One output of unit of indication and information output is connected to second input of storage, output of digital-to-analog converter is connected to one of inputs of subtracter to which second input output of unit of automatic gain control is connected. Output of subtracter is linked to input of unit of selection and processing of video signal. Natural lighting is used as source of optical radiation and rotor of helicopter is employed in the capacity of modulator of luminous flux. EFFECT: enhanced noise immunity of gear. 1 cl, 1 dwg