Motion Detector Buying AdviceMotion detection is the sensing process
(usually by electronic gadgets) of physical movement in a
specific given area like home, office, band etc. Motion
detectors can easily detect movements and activate an alarm or
switch on an image-recording device. A motion detector is just
one of several components of your monitored alarm system.
These devices trip the alarm by sensing changes in the
infrared energy levels when an intruder is in the monitored
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The motion detector uses ultrasound to measure distance and
motions. Ultrasonic pulses are emitted by the motion detector,
reflected from a target, and then detected by the device. The time
it takes for the reflected pulses to return is used to calculate
position, velocity, and acceleration. This allows you to study the
motion of objects such as a person walking, a ball in free fall, or
a cart on a ramp.
The motion detection sensor is made of a
crystalline material that generates a surface electric charge when
exposed to heat in the form of infrared radiation. When the amount
of radiation striking the crystal changes, the amount of charge also
changes and can then be measured with a sensitive FET device built
into the sensor. The sensor elements are sensitive to radiation over
a wide range so a filter window is added to the package to limit
incoming radiation to the 8 to 14mm range, which is most sensitive
to human body radiation.
Monitored alarm vendors can help to
install a motion detector at various parts of your home or office.
The device is typically small and installed in discreet areas like
the corners of windows or on walls. Motion detectors can protect
large surface areas ¨C a single device can detect any movement in a
100-foot radius ¨C by alerting the central monitoring station that
there is an unauthorized entry on the premises.
Before
including a motion detector as part of your home security system,
make sure it¡¯s the right option for you. For businesses, you need to
deactivate your alarm before entering as you could trip the motion
detector unknowingly. If you own house pets, many newer motion
detectors include a pet alley that will allow them to roam freely
around without triggering the alarm. However, if your pets are very
active, they may set more sensitive systems off.
Video
motion detectors: Advanced network video system can judge what is
normal behavior and what is abnormal behavior, and it can trigger
alerts to record action accordingly. It can alert operators based on
what happens within the field of view of the camera. The
functionality can either be built-in into a network video product or
made available with video management software. Video motion
detector, as an integrated function of network cameras or video
servers, offers substantial advantages over the software alternative
- the most significant being that the motion detection is processed
in the network camera or video server itself.
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