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Three-Dimensional Mapping of Inductive Loop Detector Sensitivity with Field Measurement Day, Christopher M ; Brennan Jr, Thomas M ; Harding, Matthew L ; Premachandra, Hiromal ; Jacobs, Allen ; Bullock, Darcy M ; Krogmeier, James V ; Sturdevant, James R

Av: Medverkande: Serie: ; 2128Utgivningsinformation: Washington DC Transportation Research Record: Journal of the Transportation Research Board, 2009Beskrivning: s. 35-47ISBN:
  • 9780309142601
Ämnen: Bibl.nr: VTI P8167:2128Location: Abstrakt: Inductance loops continue to be the most widely used sensing device for vehicle detection. Several different loop geometries are commonly used, but scant technical design literature quantifies their field of detection and sensitivity. Three-dimensional maps of loop response sensitivity based on field measurement with loops installed in asphalt are presented. Loop response was characterized for different metal objects at various heights from the pavement surface. Sensitivity maps were generated for 6-ft circular, 6-ft octagonal, 20-ft octagonal, and 20-ft quadrupole loops. From the field observations, it is concluded that the claims of increased vehicle sensitivity for quadrupole loops first published in the 1970s are inaccurate for most vehicles and quadrupole loops are in fact less sensitive than comparatively sized rectangular loops.
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Inductance loops continue to be the most widely used sensing device for vehicle detection. Several different loop geometries are commonly used, but scant technical design literature quantifies their field of detection and sensitivity. Three-dimensional maps of loop response sensitivity based on field measurement with loops installed in asphalt are presented. Loop response was characterized for different metal objects at various heights from the pavement surface. Sensitivity maps were generated for 6-ft circular, 6-ft octagonal, 20-ft octagonal, and 20-ft quadrupole loops. From the field observations, it is concluded that the claims of increased vehicle sensitivity for quadrupole loops first published in the 1970s are inaccurate for most vehicles and quadrupole loops are in fact less sensitive than comparatively sized rectangular loops.