Ultrasonic
Internal Movement Sensor
The ULTRASONIC movement sensor is designed to detect any
movement in it's field path confined to the cabin area of a motor car or van. It
will detect any glass being broken, forced out or smashed.
Our company was one of the first to pioneer this type of
detection in the late 1970's. Unlike some of our competitors our ultrasonic
detector is "quartz" locked on it's operating frequency 40khz. This is very
important as it keeps the unit perfectly stable in varying temperatures and
changing conditions.
The unit is comprised of two small microphones
approximately one centimeter in diameter mounted each side of the dash board.
For the ultrasonic to operate the windows and sunroof must be closed. A field is
set up on the "Doppler" principle using high frequency sound waves unable to be
heard by human ears and the air movement in the vehicle is constantly monitored
in this way. Any interference or interruption in this air space such as a window
being broken of any movement in the field of the unit will cause the field to
change and the analyzer circuit connected to these detectors will trigger the
alarm.
For piece of mind that the interior of the vehicle is
protected ultrasonic is the best alternative.
For convertible vehicles where the vehicle is left open a
microwave sensors should be used.
For lock protection and to detect impact into the cabin of
the area of the car a "Volumatic" sensors can be used in conjunction with the
ultrasonic.
