Angular (pitch and yaw) vibration measurements directly from rotors using laser vibrometry
Exact mathematical descriptions of measured velocity for parallel beam laser vibrometers developed. Polished-circular on rotor side and rough rotor end face configurations recommended. Experimental investigation of effect of surface roughness on cross-sensitivity presented. Maximum roughness and vibration amplitude for qualification as polished-circular case defined. Simulations used to quantify typical measurement errors to be expected.
angular vibration measurement laser vibrometry surface roughness misalignment pseudo-vibration