Closed loop
Encyclopedia
Closed loop may refer to:
- A feedbackFeedbackFeedback describes the situation when output from an event or phenomenon in the past will influence an occurrence or occurrences of the same Feedback describes the situation when output from (or information about the result of) an event or phenomenon in the past will influence an occurrence or...
loop, often found in:- Control theory#Closed-loop transfer function, where a closed-loop controller may be used
- Electronic feedback loops in electronic circuits
- PID controllerPID controllerA proportional–integral–derivative controller is a generic control loop feedback mechanism widely used in industrial control systems – a PID is the most commonly used feedback controller. A PID controller calculates an "error" value as the difference between a measured process variable and a...
, a commonly used closed-loop controller
- Closed ecological systemClosed ecological systemClosed ecological systems are ecosystems that do not rely on matter exchange with any part outside the system.The term is most often used to describe small manmade ecosystems...
not relying on matter exchange outside of the system, as opposed to open loop - Ecological sanitationEcological sanitationEcological sanitation, also known as ecosan or eco-san, are terms coined to describe a form of sanitation that usually involves urine diversion and the recycling of water and nutrients contained within human wastes back into the local environment....
systems or ecosan, intended to close the nutrient and water cycle - Pulling water from one area of a reef aquariumReef aquariumA reef aquarium or reef tank is an marine aquarium that prominently displays live corals and other marine invertebrates as well as fish that play a role in maintaining the coral reef environment...
and pumping it immediately elsewhere in the tank to create higher flow and minimize dead spots