THORLABS TIM101 User Manual page 42

Appendix E
open loop control
demand
closed loop control
demand
+
The result of using closed-loop control is a linear relationship between demand
(voltage) and measured position – see Fig. E.4, in contrast to open loop control – see
Fig. E.2.
real position
42
amp
a + b/s
_
Fig. E.3 Open loop and closed loop control
Fig. E.4 Closed loop response
actuator
amp actuator
sensor
demand position
moving
part
moving
part
HA0195T Rev A Jun 2017