LASER DEVICE TO MEASURE AIR GAP OF ELECTRIC MACHINE Russian patent published in 2012 - IPC G01B11/14 H02K15/00 

FIELD: electricity.

SUBSTANCE: laser device to measure an air gap of an electric machine, comprising a stator and a rotor, includes a laser, having two faces of a resonator to radiate output light, the light from the first face of the resonator is scattered on the surface of the electric machine rotor and arrives back into the laser, a module to control optical frequency of the laser, connected to the laser and changing its optical working frequency, a module of optical detection sensitive to output light from the second face of the resonator. Intensity of the output light is related to the distance to the rotor due to interference in the laser between the scattered light from the rotor and the light in the laser. Also the device comprises a module of synchronisation with a rotor, which is connected to the module of distance measurement, and a module of phase accumulation, which is connected to the module of synchronisation and module of distance measurement and performs phase accumulation of measured data.

EFFECT: invention provides for reduced error of measurement with availability of high resolution of measured data.

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