Home' RTCA Documents for Review : DO-230H FRAC Contents 96
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may be carrying, number of wheelchairs and other variables. The airport operator is the authority to
determine if high security, low throughput capacity overrides less secure, higher capacity exit processing.
Microwave (Motion Detection)
Upon detecting the movement of a pedestrian approaching an automatic door, a microwave sensor closes a
set of contacts to complete a control circuit connected to the motor control unit of an automatic door. The
signal is received by the control unit that initiates the door opening cycle.
Motion detection sensors can also be used in a reverse scenario. Upon detecting the movement of a
pedestrian approaching an automatic door from the wrong direction, the same signal can be used to
command the automatic door to lock and not open. The door control may also provide Input & Output
(I/O) points to enable use of audible devices such as sirens, horns, voice annunciated messages as well as
visual devices such as flashing beacons.
Infrared (Presence Detection)
Upon detecting the presence of a person or object of reasonable size, an infrared presence sensor closes a
set of contacts to complete a control circuit connected to the motor control of an automatic door. The signal
is received by the control unit that disables the door opening cycle and prevents moving door panels from
making physical contact with the pedestrian. The closed signal will continue until the person or object
moves out of the sensor detection area.
Presence detection sensors can also be used to provide signals to control Input & Output (I/O) points to
enable use of audible devices such as sirens, horns, voice annunciated messages as well as visual devices
such as flashing beacons.
A negative aspect to infrared detection technology is what is referred to as “learning.” Learning means if
the person remains for a certain time programmed in the sensor, the sensor times out under an “instruction”
that the detected object is intentionally in place, ignores the presence and initiates a door opening cycle.
Video (Visible Light)
The most current ELBC technology will find the utilization of microwave and infrared sensors, mainly used
for their original intent; activation and presence detection respectively; and now implements a third layer
of sensors, such as cameras. In this application, the cameras “act” as a sensor; not necessarily in that they
detect movement or heat, instead capture real time images and produce video streams which are then feed
into a microprocessor running embedded analytic software.
The software continually analyzes the video images and applies specifically developed algorithms to
compare traffic flow to a known, authorized travel direction. In a static state, with no traffic flow will form
the base for a safe and secure environment. The ELBC camera system is constantly surveying and
monitoring the exit lane area from both the non-sterile (landside) and sterile (airside) zones. Many video
systems are capable to detect objects identified to be a potential intrusion, attempts to throw objects through
a corridor area and detect objects that are abandoned within the corridor area.
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