THORLABS KIM101 - Appendix F Thorlabs Worldwide Contacts

Rev E June 2023
Appendix D Piezo Operation - Background
Page 54
Fig. D.3 Open loop and closed loop control
The result of using closed-loop control is a linear relationship between demand
(voltage) and measured position – see Fig. D.4, in contrast to open loop control – see
Fig. D.2.
Fig. D.4 Closed loop response
amp actuator
demand
moving
part
open loop control
amp actuator
sensor
a + b/s
demand
moving
part
closed loop control
+
_
real position
demand position