37/51 4.3 Relative Displacement:Translational and Rotational Cable IX.Piezoelectric Transducers Crystal Amplifier Amplifier input current assumed zero + Charge generator q=Kaxi d Current generator r=Kg元 (el P Pampl Pleak Rampl Pleak ≈Rampl CCer+Ccoble+Campl Figure 4.40(c)-(d)Equivalent Circuit for Piezoelectric Transducer 38/51 4.3 Relative Displacement:Translational and Rotational X.Electro-Optical Devices Combine optical and electronic principles for displacement-measuring devices ser Collimating lens Rotating Photodetector prism and preamp Motor drive System Double oscillator Counter Gate differentiate Digital display Figure 4.45 Laser Dimensional Gage4.3 Relative Displacement: Translational and Rotational IX. Piezoelectric Transducers Figure 4.40(c)-(d) Equivalent Circuit for Piezoelectric Transducer 37/51 4.3 Relative Displacement: Translational and Rotational X. Electro-Optical Devices ‹ Combine optical and electronic principles for displacement-measuring devices Figure 4.45 Laser Dimensional Gage 38/51