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A motion detector attached to an outdoor, automatic light. A motion detector is an electrical device that utilizes a sensor to detect nearby motion (motion detection).Such a device is often integrated as a component of a system that automatically performs a task or alerts a user of motion in an area.
The automatic door used a mat actuator. In 1960, they co-founded Horton Automatics Inc and placed the first commercial automatic sliding door on the market. [5] With the invention of the Gunn diode, microwave motion detectors became common in automatic doors in the 1970s. [6] [7] In 1980, the first automatic door using an infrared sensor was ...
Microwave sensors used to detect motion of a person as they approach an automatic door, Reflective optical sensors that are mounted on the door header, and detect the presence of a person in the door path; Camera based sensors that are also mounted on the door header and similarly detect presence; and; Triangulation sensors which are mounted on ...
A door operator may use sensors to prevent the door from coming into contact with a user. Full Energy operators require at least 3 sensors. Low-energy operators are not required to have safety sensors, as the door is allowed to come in contact with a user, given that the kinetic energy of the moving door is limited by the reduced moving speed.
An automatic door closer, more often called a "door opener", opens the door itself, typically under the control of a push button, motion detector or other device, and then uses a motion sensor or proximity detector to determine when it is safe to close it.
When the sensor is pressed, it releases an electromagnetic lock. It may be used in tandem with a motion sensor which unlocks for anyone who stands in front of the door. This type of release must still unlock in the event of a power failure, and in some jurisdictions, the door must automatically unlock for a fire alarm activation. [12]