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:

    “On a flat road runs the well-trained runner,
    He is lean and sinewy with muscular legs,
    He is thinly clothed, he leans forward as he runs,
    With lightly closed fists and arms partially raised.”
    —Walt Whitman (1819–1892)