Research on the Laser Doppler Torque Sensor

Based on laser Doppler effect, single section rotational speed of a rotating shaft was measured. By measuring the two sections rotational speed, the difference of the rotational speed between the two could be made. Integrating the rotational speed difference, the relative torsional angle of the two sections under the action of torsional virbration was received, so the rotating shaft torque was gotten. Non-contact torque measurement of rotary machine was achieved. The system was designed and the experiment was done on the torque experiment equipment. The result of experimentation indicate that the relative error between Laser Doppler and conventional torque measuring method that was less than 0.2%, and the measurement accuracy of Laser Doppler was high