4351 4.4 Relative Velocity:Translational and Rotational ll.Velocity by Electrical Differentiation of Voltage Signals The differentiating of any displacement transducer may be applied to the input of a suitable differentiating circuit to obtain a voltage proportional to velocity. The main problem is that differentiation accentuates(Make more noticeable or prominent any low amplitude,high-frequency noise present in the displacement signal. 44/51 4.4 Relative Velocity:Translational and Rotational Ill.Average Velocity from Measured△xand△t Iron pins in aluminum bar Magnetic proximity pickup in. 7777777777777777777 I in. Vovo=0.05sec=20in./sec 0.05 sec Permanent magnet 8 (a)The application of variable- Proximity pickup reluctance proximity pickup Figure4.70 Velocity measurement as△x/△tII. Velocity by Electrical Differentiation of Voltage Signals ‹ The differentiating of any displacement transducer may be applied to the input of a suitable differentiating circuit to obtain a voltage proportional to velocity. ‹ The main problem is that differentiation accentuates (Make more noticeable or prominent ) any low amplitude, high-frequency noise present in the displacement signal. 4.4 Relative Velocity: Translational and Rotational 43/51 III. Average Velocity from Measured ∆x and ∆t (a) The application of variable￾reluctance proximity pickup Figure 4.70 Velocity measurement as ∆x/∆t 4.4 Relative Velocity: Translational and Rotational 44/51