RAM20 – OVERHEIGHT VEHICLE DETECTION
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RAM20 has been developed to detect moving objects passing over the allowed height. RAM20 is also able to measure the distance of the object from the sensor and therefore to give information about the lane in which the objectpassed (even in roadside installation). This system is generally installed on roads close to a bridge, tunnel or other structure to safeguard.
RAM20 is based on a laser scanner with 4 planes of detection (which helps for a precise detection of small objects and to avoid false alarms) with a beam width of 96 degrees. The emitted light (in the range of the infrared light, not visible) is modulated to be captured on the receiver filtering the ambient light noises.
The laser scanner has an internal heating system to avoid the moisture condensation on the optical lens.
In addition to detecting the maximum height the system is also able to inform on which lane the vehicle has passed.
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Compared to the standard systems based on photocells with transmitter and receiver it has the advantage of easy installation because the laser and the control unit are placed on the same pole. Moreover it is not necessary to collimate the transmitter and receiver but only to properly install the detector on the horizontal or vertical plane.
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The control unit is composed by an outdoor cabinet which includes a power supply, a CPU and a communication unit.
ALARM
RAM20 provides alarms in different ways when an over height vehicle is detected: relay contact; digital output; software event (protocol)
The control unit is based on a ARM9 microprocessor (with software and hardware watchdog) with the following features:
·Diagnostics of the laser scanner detector
·Computation of the size of the detected object
·Computation of the distance of the object from the sensor to determine the lane of transit
·Filtering of noises such rain, snow, birds, etc.
·Generation of alarms in case of detection of an overheight object withactivation of a digital output, software alarm or relay.
INSTALLATION
The detector must be installed with the scanning planes in horizontal position exactly at the threshold height.
RAM20, installed on the side of the road, can detect overheight vehicles on 2 lanes. For a 4 lane road it is possible to install two RAM20 systems, one on each side of the road.
VARIABLE MESSAGE SIGN
It is also possible to combine the laser detection with a variable message sign (VMS) to inform the driver that he has to stop his vehicle or exit.
The VMS can be installed on the side of the road in a pole positioned approximately 100 m. after the pole of the RAM20