Calibration of Sensors for Angular Vibration Measurements VSB – Technical University of Ostrava Faculty of Mechanical Engineering Ostrava, Czech Republic Lubomir Smutny, Jiri Tuma, Radim Farana IMEKO XVIII Word Congress, Rio de Janeiro, RJ, Brazil September 16 – 22, 2006
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Calibration of Sensors for Angular Vibration MeasurementsVSB – Technical University of Ostrava Faculty of Mechanical Engineering Ostrava, Czech Republic
Lubomir Smutny, Jiri Tuma, Radim Farana
IMEKO XVIII Word Congress, Rio de Janeiro, RJ, BrazilSeptember 16 – 22, 2006
MotivationCalibration problemPrinciple of phase demodulation using Hilbert transformCalibration procedureSoftware tools for phase demodulationConclusion
Transducers & Signal Processing Methods for Angular Vibration Measurements
Tangentially mounted accelerometersLaser Torsional Vibration Meter (Doppler effect)Incremental rotary encoders(several hundreds of pulses per revolution)
Time interval length measurements
Sample number & InterpolationHigh frequency oscillator (10 GHz) & Impulse counter (Rotec)
Laser Torsional Vibration MeterDual-beam laser transducer based on the Doppler effectLaser: Ga-Al-As diode producing 780 nm lightOutput: instantaneous changes in angular velocityMeasurement ranges:10, 100, 1000, 100000/s Frequency range: 0.3 to 1000 Hz Accuracy: ±1% of full scale Brüel & Kjær Type 2523
Verifying the method of the phase demodulation by comparing simultaneous encoder and laser angular vibration measurementsComparing of two identical encoders mounted on the common shaft
ConclusionThe paper is focused on the calibration of the angular vibration sensorsThere are many approaches to angular vibration measurements, e.g. laser vibrometers, encodersPhase demodulation based on the theory of analytical signals gives reliable result of measurementsThe low impulse number encoders seem to be more accurate at the 1/20-part of a circle than the maximum directional error stated in the Heidenhain brochureThe theory is illustrated by the verification and comparison of the encoders.