JAI TS-2030EN, TS-9720EN, TS-1327EN manual System Components description, Preparing for Installation

VIS-CAM System

Figure 1. VIS elements

1.3 System Components description

1.3.1Traffic Light Sensor – TLS300

The JAI traffic light sensor is the driver of the VIS control network. It controls video signal parameters of each camera to ensure high contrast images of passing vehicles and their license plates, regardless of vehicle speed, weather or ambient light conditions.

Under the clear plastic dome of the traffic light sensor are mounted, in opposing directions, two vertical plates and corresponding light collection staffs that protrude above a flat black base plate. The sensor measures the ambient light reflecting off the face of both vertical plates. The design is such that when the face of one plate is in direct sun, the other one is in shadow. These two measurements identify the range of light levels that the camera is required to image without saturation when a vehicle and its license plate are in the camera’s field of view (FOV). To ensure correct functionality of the TLS-300, it is very important to ensure during installation, that the sensor’s base plate is levelled with the road surface, and that the orientation of the sensor is rotated so that the direction from the vertical plate A to vertical plate B is the same as the direction of the traffic flow being observed by the traffic camera (see Figure 2).

2 Preparing for Installation