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Inductive loop detector

A detector and induction ring technology, applied in the field of induction ring detectors, can solve problems such as detector damage and damage, achieve good intensity characteristics, and enhance the effect of electric field strength

Inactive Publication Date: 2005-01-05
ROLAND CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such detectors are susceptible to potential damage from the pressure of heavy vehicle passage, wear, weather and falling corrosive substances
Additionally, these detectors are often subject to vandalism

Method used

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  • Inductive loop detector
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0049] First aspect of the invention

[0050] The surface mount inductive loop detector 1 according to the invention shown in Figures 1 and 2 comprises a substantially flat disc comprising two main parts. An elastic, cut-resistant, hard plastic disc pad 2 (hereinafter referred to as "plastic disc") as shown in FIGS. 6 and 7 is fixed inside a hard metal outer ring 3 as shown in FIGS. 3 and 4 . The metal ring has a discontinuity which is a single radial gap 17 with a width of approximately 1 mm.

[0051] The plastic disc 2 shown in Figure 7 has a lip 4 around its entire circumference which engages a shoulder in the inner circumference of the metal ring. The plastic disk also has a circumferential channel 5 to accommodate and protect the coiled induction wire loop structure 6 shown in FIGS. 2 , 5 and 7 . Due to the strength of its protective coating, Teflon-coated wires with a diameter of 1.5 mm to 2 mm are preferred as induction wires. Coil the wire multiple times around the ...

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PUM

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Abstract

In a first aspect, this invention provides a surface-mount inductive loop detector including: a pad having encased therein an inductive loop which is adapted for connection to an external electronic controller device; said pad being fixed within a hardened, bevelled peripheral edge that is provided with means for fixing the pad to a surface. In a second aspect, this invention provides a surface-mount inductive loop detector including: an inductive loop which is adapted for connection to an external electronic controller device; a protective cover in the form of a substantially inflexible ring having a hardened, bevelled peripheral edge; said ring adapted to accommodate the inductive loop between a mounting surface and a lower surface of the ring and provided with means for fixing the detector to the mounting surface.

Description

technical field [0001] The invention relates to the field of induction loop detectors. In particular, the present invention relates to induction loop detectors integrally formed with a protective cover which may be surface mounted or installed in the ground. Background technique [0002] Inductive loop detectors commonly used for electric motor vehicle detection are known in the art. The loop generally comprises one or more turns of sensing wire disposed under or within the surface of a road or the like on which the vehicle to be detected passes. Typically, the ring is rectangular or square, measures approximately 1.5 to 2 meters across, and includes wire tails connected to known electronics that cause the ring to oscillate at a predetermined frequency. Frequency changes in a loop are monitored to detect vehicles appearing on or near the loop. [0003] Inductive loop detectors are typically made by cutting a concrete pavement or asphalt into patterned slits approximately ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G08G1/042
CPCG08G1/042
Inventor 罗兰
Owner ROLAND CORP