Closed loop may refer to:
- A feedback loop, often found in:
- Closed-loop transfer function, where a closed-loop controller may be used
- Electronic feedback loops in electronic circuits
- PID controller, a commonly used closed-loop controller
- Closed ecological system not relying on matter exchange outside of the system, as opposed to open loop
- Ecological sanitation systems or ecosan, intended to close the nutrient and water cycle
- Pulling water from one area of a reef aquarium and pumping it immediately elsewhere in the tank to create higher flow and minimize dead spots
Famous quotes containing the word closed:
“Thus piteously Love closed what he begat:
The union of this ever-diverse pair!
These two were rapid falcons in a snare,
Condemned to do the flitting of the bat.”
—George Meredith (18281909)