Traffic count

radar lasersysteme

The traffic data collection is an essential basis for traffic and spartial planning. Based on the collected data, mobility and traffic concepts are developed and traffic forecasts are prepared for the future.

Since many years EBE Solutions deals with traffic data collection and offers individual solutions for its customers. These includes inter alia the installation and the initial operation as well as the service and maintenance of sensor systems, up to the data transmission and data evaluation as well as the preparation of the traffic data. Furthermore we offer our customers traffic data collection as a service, beginning by the rental of the sensor devices over the system installation, up to data evaluation.

By the long experience in this area we have focused ourselves on the following systems:

Radar sensors

Radar (radio detection and ranging) is a procedure, which detects objects without touch by the help of electromagnetic waves at the high frequency range. Electromagnetic waves are only reflected by objects whose magnitude is greater than their wavelength. That’s why the radar measurements are not influenced by weather effects.

Essential advantages of radar sensors:
+ Barely atmospheric influences
+ Capture of several lanes with one sensor
 
Essential disadvantages of radar sensors:
– Exactness of the measured values is depending on the measuring distance (shadowing)

 

Induction loops

As induction loops one or several leading loops are mounted in the roadway as a sensor and connected with a detector. The loop is supplied by the detector oscillator with alternating current and monitors the inductance on an electric swinging circle.

An electromagnetic field is generated in the loop, which changes through moving electric conductors. If a vehicle drives over the induction loop, the electromagnetic field of the induction loop is changed by the metal parts of the vehicle. In the vehicle itself whirl streams are induced which influence the alternating field of the induction loop.

Essential advantages of induction loops
+ Easy technology
Essential disadvantages of induction loops
– Time-consuming installation in the roadway (leads to traffic obstruction)

 

Infrared Sensors

The measuring principle of active infrared sensors is based on the duration measurement of electromagnetic radiation. From the sensor the measuring field is irradiated by infrared light emitting diodes or by laser diodes. The reflected radiation is focused by an optical system on the receipt sensor and is converted into electric signals. A processor evaluates these signals and their duration on a real-time basis.

The range of a laser sensor depends on the size of the vehicle, the broadcasting strength of the scanner, on the pollution level of the sensors as well as on the weather conditions (for example fog and snow). The range is about 40 to 60 meters.

Essential advantages of infrared sensors
+ Active infrared sensors with a three-dimensional illustration can recognise hitches and use this ability for the classification of vehicles
 
Essential disadvantages of infrared sensors
– Weather has an influence on the exactness of the measured values

 

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