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Sensor Configuration
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The drawing above shows the principle of the sensor arrangement. The individual sensor strips are inserted in frames which can be arranged in one common slot. If the pavement consists of panels then two sensor strips cover one panel in a way that their feeder ends meet and overlap in the middle, so there is no gap in sensitivity at that place. At the panel boundaries the sensor tips meet, and at these places a small insensitive region about 10 cm wide can not be avoided.
The feeder cables are guided in a duct integrated in the frames so there is no extra installation effort required. The drawing above shows the construction of the frame in detail. It is 45 mm high, i.e. there is a slot of at least 50 mm depth necessary to accept it. The sensor strip is inserted in the dovetail-shaped slot to the left; the square slot on the right side ist the cable duct. The drawing below shows the way the frames are assembled to make up a sensor array.
The frames are manufactured from a special reinforced plastic material which has undergone extensive testing in road traffic. They are secured with special stainless steel concrete screws which have been approved by DIBT (Deutsches Institut für Bautechnik). |
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