Closed loop
Closed loop or closed-loop may refer to:
Mathematics
- Loop (topology), topological path whose initial point is equal to its terminal point
- Closed curve, the image of a continuous mapping of a circle
Technology
- Closed-loop controller, control law that uses knowledge of the state or output
- Closed-loop transfer function, mathematical function describing the net result of the effects of a feedback control loop on the input signal to the plant under control
- Electronic feedback loop
- Proportional–integral–derivative controller (PID), type of feedback controller using three terms (P, I, and D)
- Closed ecological system, ecosystem that does not exchange matter with the exterior
- Closed-loop communication, communication technique in which every received message is confirmed by the sender
- Ecological sanitation systems (or ecosan), approach to sanitation provision which aims to safely reuse excreta in agriculture
Other uses
- Circular economy, with materials recycled
- Closed time loop, a paradox of time travel
- Knot loop, in a knot
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