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:

    “With two sons born eighteen months apart, I operated mainly on automatic pilot through the ceaseless activity of their early childhood. I remember opening the refrigerator late one night and finding a roll of aluminum foil next to a pair of small red tennies. Certain that I was responsible for the refrigerated shoes, I quickly closed the door and ran upstairs to make sure I had put the babies in their cribs instead of the linen closet.”
    —Mary Kay Blakely (20th century)