Independent from destabilizing factors influence contactless optic sensor for position and vibration measurements in automatic systems

During contactless vibration measurements of disks, blades and other rotation construction elements of engine it is necessary to inspect of the operation gap between research object surface and the sensor with high precision (0.05 % – 0.1 %) in the conditions of such destabilizing factors influence, as strong electromagnetic and electrostatic fields, environment pollution, wear of construction elements of engine, high temperatures, feeding sources voltages variations, earch surface reflecting coefficient changes and so on. Moreover the influence factors are changing accident ally. In order to solve this problem the two-channel optic sensor with modulated emission for precision positioning was elaborated. In this sensor the positioning accuracy is achieved by subtraction of the photodiodes currents, research object surface is illuminated by modulated emission with the help of semiconductor laser, and laser pulses duration is chosen divisible to 1/50 Hz. The long-time positioning error (during a few hours) at the output of the device doesn't exceed 0,1 micrometer in the conditions of enumerated destabilizing factors influence.