Closed Loop

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:

    “Because you live, O Christ,
    the spirit bird of hope is freed for flying,
    our cages of despair no longer keep us closed and life-denying.
    The stone has rolled away and death cannot imprison!
    O sing this Easter Day, for Jesus Christ has risen!”
    —Shirley Erena Murray (20th century)