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SENSORS | ARTICLE


<< Figure 3: Housed in a 12 cm package and shown embedded in the street pavement, the vehicle presence parking node consists of a magnetic sensor, signal conditioning electronics, communications IC and a 7-10 years batery. Courtesy: Libellium. >>


Smart transport is another major Internet of Things opportunity.


Sensys Networks (www.sensysnetworks.com) has developed a similar magnetic sensor- based system for use in traffic intersections. Te system consists of a three-axis magnetometer, signal conditioning electronics with embedded soſtware and a radio in a 3 x 3 x 3 inch package that gets embedded at traffic roadways and intersections (figure 4) — they are a lower cost solution expected to replace the large, six foot diameter magnetic loops that proliferate today. Information of vehicle presence is transmited to a collecting platorm and transmited to the cloud for processing and traffic light control. Current research activity at Sensys Networks includes the introduction of a low-noise floor, high-sensitivity accelerometer in the package to determine vehicle classification based on axle counts and spacing based on vibration signature analysis.


Finally, the company has introduced ‘micro radar’ sensor systems, which are installed at intersections and bike lanes. Here a highly directive radar antenna operating at 6.3 GHz determines the presence of bicycles in a range from 1.2 to 3.0 meters. Te radar approach was adopted since a magnetic sensor cannot adequately detect the presence of people and most bicycles, especially those bicycles that are made of carbon composite materials. Similar functionalities including signal processing, batery and radio functions are employed. Tis system can also be used for parking applications. Tey are also developing this radar system to detect people at intersections for traffic light control.


<< Figure 4: Smart Transport applications include traffic lane monitoring, intersection monitoring for vehicles and bike lane/intersection monitoring as well as parking space occupancy status. Magnetic sensors are the sensor of choice for vehicle detection and radar sensors for pedestrian and bicycle detection. Courtesy: Sensys Networks. >>


42 | commercial micro manufacturing international Vol 7 No.6


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