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Inductive Loop Detector Technology

Inductive Loop Detector Technology. Detecting Traffic for nearly 45 years. A Brief History. Detection of vehicles since the early 1960’s Designs based on solid-state analog loop technology using discrete components i.e. transistors, diodes, etc.

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Inductive Loop Detector Technology

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  1. Inductive Loop Detector Technology Detecting Traffic for nearly 45 years

  2. A Brief History • Detection of vehicles since the early 1960’s • Designs based on solid-state analog loop technology using discrete components i.e. transistors, diodes, etc. • Loops varied in size from small loops to large loops • The size of the loop is dependent upon the requirements of the control system

  3. History continued • Smaller loops were typically used with “volume density controllers” where vehicle count information was needed to vary the timing of traffic signals • By the early 1980’s digital loop detectors were replacing the earlier analog loop detectors.

  4. The “IL” (Inductive Loop)

  5. The “IL” (Inductive Loop)

  6. How it works • When a vehicle reaches the loop, the metal of the vehicle disturbs the magnetic field over the loop • This disturbance causes the loop inductance to change

  7. The figure below illustrates the distinguishing double-hump characteristic of ground vehicles.

  8. Yeah but??? • The size of the loop, shape of the loop, number of turns in the loop coil, and the length of the lead-in wire all combine to form a specific circuit • The current passing through the loop generates an electromagnetic field. When a vehicle passes through the field, it acts as a conductor, changing the inductance of the loop. • The sensor detects this change and notifies the traffic-signal controller of its finding.

  9. Today • New software-based detector designs utilize the latest available state of the art “microprocessor” technology. An area of significant importance, which benefits from the new microprocessor technology, is in accurately gathering and processing “inductive loop signature” information. • Each vehicle having a different shape, which passes over the inductive loop embedded in the pavement, produces a different “signature”. The inductive loop signature can provide valuable information about different shaped vehicles passing over the loops. This information can be utilized by traffic control systems to increase the responsiveness of those systems.

  10. For more information • www.renoae.com • www.romanse.org.uk/technologies/loops.htm • http://www.tfhrc.gov/pubrds/septoct98/loop.htm • http://www.geocities.com/SiliconValley/Port/2945/Traffic/TrafficSensors.htm • http://www.faa.gov/and/and400/and410/lot/concept.htm

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