JP5912405B2 - Installation structure of loop coil for metal object detection - Google Patents

Installation structure of loop coil for metal object detection Download PDF

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JP5912405B2
JP5912405B2 JP2011233652A JP2011233652A JP5912405B2 JP 5912405 B2 JP5912405 B2 JP 5912405B2 JP 2011233652 A JP2011233652 A JP 2011233652A JP 2011233652 A JP2011233652 A JP 2011233652A JP 5912405 B2 JP5912405 B2 JP 5912405B2
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谷　正道
正道 谷
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株式会社未来技研
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本発明は、金属物体検知用ループコイルの設置構造に関し、特に、ループコイルによる検知感度を向上させた金属物体検知用ループコイルの設置構造に関する。   The present invention relates to an installation structure of a metal object detection loop coil, and more particularly to an installation structure of a metal object detection loop coil with improved detection sensitivity by the loop coil.

従来、金属物体検知用ループコイルの設置構造として特許文献１に記載の車両検知技術が公知になっている。
通常、このような金属物体検知用ループコイルの設置構造は、ループコイルを車両が停止若しくは通過する路面に対し、車両の幅方向に長い略長方形の状態で埋設されている。
ところが、路面がコンクリートで、内部に縦横格子状に鉄筋が埋め込まれていると、この鉄筋にループコイルの磁界が吸収され、検知感度が悪くなるという問題があった。
そこで、従来では、図４に示すように、ループコイル１における車両の進行方向に沿う左右両辺１１、１１が、車両の進行方向に沿う鉄筋３のライン上に沿わないように埋設配置することにより、鉄筋３、４への磁界の吸収を抑制するようにしていた。 Conventionally, a vehicle detection technique described in Patent Document 1 has been publicly known as an installation structure of a metal object detection loop coil.
Usually, such a metal object detection loop coil installation structure is embedded in a substantially rectangular state that is long in the width direction of the vehicle with respect to a road surface on which the vehicle stops or passes.
However, when the road surface is concrete and the reinforcing bars are embedded in the form of vertical and horizontal grids, the magnetic field of the loop coil is absorbed by the reinforcing bars, and the detection sensitivity is deteriorated.
Therefore, conventionally, as shown in FIG. 4, the left and right sides 11, 11 along the traveling direction of the vehicle in the loop coil 1 are embedded and arranged so as not to lie along the line of the reinforcing bar 3 along the traveling direction of the vehicle. The absorption of the magnetic field to the reinforcing bars 3 and 4 was suppressed.

特開２００９−１９９２５７号公報JP 2009-199257 A

しかしながら、普通自動車のように４輪車両の場合は、検知する金属部分が前後左右方向に広いため、ほとんど問題はないが、検知する金属部分の幅方向が狭い自転車や自動二輪車等の小車両の場合、車両の進行方向と直交するループコイル１の前後両辺１２、１２部分では、小車両の磁界を吸収できる面積が狭いため、検知感度が極めて悪く、このため、停止又は通過する位置によっても、検知感度に差が生じるという問題があった。
もっとも、ループコイル１の巻き数を増やすことで、ある程度解決可能であるが、コストが高く付くだけでなく、設置のための埋設作業が困難になるという問題がある。
すなわち、このような多数回巻いたループコイルでは、コイル径が太くなり、コイルの設置作業に数日が必要となる。例えば、４巻以上の巻線のループコイルでは、保護管等も含めコイル径が数ｃｍにもなる。このようなコイルを設置するためには、１ｍ四方に５〜１０ｃｍ幅の配設溝を掘る必要があり、路面カッターによる切断作業、設置後の埋め戻し作業に手間を要するという問題があった。 However, in the case of a four-wheeled vehicle such as an ordinary automobile, the metal part to be detected is wide in the front-rear and left-right directions, so there is almost no problem. However, in the case of small vehicles such as bicycles and motorcycles where the metal part to be detected is narrow in the width direction. In this case, the front and rear sides 12 and 12 of the loop coil 1 orthogonal to the traveling direction of the vehicle have a small area that can absorb the magnetic field of the small vehicle, so the detection sensitivity is extremely poor, and therefore, depending on the position where the vehicle stops or passes, There was a problem that a difference in detection sensitivity occurred.
However, it can be solved to some extent by increasing the number of turns of the loop coil 1, but there is a problem that not only the cost increases, but also the burying work for installation becomes difficult.
That is, in such a loop coil wound many times, the coil diameter becomes large, and several days are required for the coil installation work. For example, a loop coil having four or more windings has a coil diameter of several centimeters including a protective tube. In order to install such a coil, it is necessary to dig an arrangement groove having a width of 5 to 10 cm in a square of 1 m, and there is a problem that it takes time for cutting work by a road surface cutter and backfilling work after installation.

本発明の解決しようとする課題は、ループコイルの巻き数を増やすことなしに、自転車や自動二輪車等の小車両の検知感度を高めることができる金属物体検知用ループコイルの設置構造を提供することにある。   The problem to be solved by the present invention is to provide a metal object detection loop coil installation structure capable of increasing the detection sensitivity of small vehicles such as bicycles and motorcycles without increasing the number of turns of the loop coil. It is in.

上記課題を解決するため請求項１記載の金属物体検知用ループコイルの設置構造は、駐車場入り口の発券機横の路面に埋設設置する金属物体検知用ループコイルの設置構造において、ループコイルの埋設設置路面に埋め込まれた縦横格子状の鉄筋の一方の鉄筋が車両の進行方向とほぼ平行する状態で埋設配置され、もう一方の鉄筋が車両の進行方向とほぼ直交する状態で路面に埋設設置され、ループコイルが埋設設置路面に埋め込まれた縦横格子状の鉄筋に対し傾斜する略直線部分を含む状態で埋設設置されていることを特徴とする手段とした。
In order to solve the above-mentioned problem, the metal object detection loop coil installation structure according to claim 1 is a metal object detection loop coil installation structure embedded in a road surface next to a ticketing machine at a parking lot entrance. One rebar of the vertical and horizontal grid reinforcing bars embedded in the installation road surface is embedded and arranged in a state of being substantially parallel to the traveling direction of the vehicle, and the other reinforcing bar is embedded and installed on the road surface in a state of being substantially orthogonal to the traveling direction of the vehicle. The loop coil is embedded and installed in a state including a substantially straight portion inclined with respect to the longitudinal and horizontal grid-like reinforcing bars embedded in the embedded installation road surface .

また、請求項２記載の金属物体検知用ループコイルの設置構造は、請求項１記載の金属物体検知用ループコイルの設置構造において、
前記ループコイルの形状が略方形であり、該略方形の各辺が縦横格子状の鉄筋に対し傾斜角度を持って埋設配置されていることを特徴とする手段とした。
Further, the metal object detection loop coil installation structure according to claim 2 is the metal object detection loop coil installation structure according to claim 1,
The loop coil has a substantially square shape, and each side of the substantially square shape is embedded and arranged at an inclination angle with respect to the reinforcing bars in a vertical and horizontal lattice shape .

また、請求項３記載の金属物体検知用ループコイルの設置構造は、請求項１又は請求項２記載の金属物体検知用ループコイルの設置構造において、
前記ループコイルの形状が車両の長手方向にむけて長い略長方形状であり、該略長方形の各辺が縦横格子状の鉄筋に対し傾斜角度を持って埋設配置されていることを特徴とする手段とした。
Further, the metal object detection loop coil installation structure according to claim 3 is the metal object detection loop coil installation structure according to claim 1 or 2,
The loop coil has a substantially rectangular shape that is long in the longitudinal direction of the vehicle, and each side of the substantially rectangular shape is embedded and arranged at an inclination angle with respect to reinforcing bars in a vertical and horizontal lattice shape. It was.

請求項１記載の発明では、上述のように、路面に埋め込まれた縦横格子状の鉄筋に対し傾斜する略直線部分を含む状態でループコイルが埋設設置されることで、縦横格子状の鉄筋にぴったり沿わせた場合よりも鉄筋への磁界の吸収を抑制することができる。
これにより、ループコイルの巻き数を増やすことなしに、自転車や自動二輪車等の小車両の検知感度を高めることができるようになるという効果が得られる。
In the first aspect of the present invention, as described above, since the loop coil is embedded placed in a state containing substantially linear portions which are inclined with respect to horizontal and vertical grid reinforcement embedded in the road surface, the horizontal and vertical grid rebar The absorption of the magnetic field to the reinforcing bars can be suppressed more than the case where they are closely aligned.
As a result, it is possible to increase the detection sensitivity of small vehicles such as bicycles and motorcycles without increasing the number of turns of the loop coil.

請求項２記載の発明では、上述のように、ループコイルの形状が略方形であり、該略方形の各辺が縦横格子状の埋設配置されることで、ループコイルの左右両辺部分では一方の鉄筋に沿わせた場合よりも鉄筋への磁界の吸収が抑制されるため、ループコイルの左右両辺部分における検知感度が高くなり、また、ループコイルの前後両辺部分では小車両の進行方向に対する直交配置状態が解消され、小車両の磁界を吸収できる面積が拡がるため、ループコイルの前後両辺部分検知感度が高くなる。
これにより、ループコイル全体的な検知感度を高めることができる。
In the invention according to claim 2, as described above, the shape of the loop coil is substantially square, and each side of the substantially square is embedded in a vertical and horizontal grid, so that one of the left and right sides of the loop coil Since the absorption of the magnetic field to the rebar is suppressed more than when it is along the rebar, the detection sensitivity on both the left and right sides of the loop coil is high, and the front and rear sides of the loop coil are orthogonal to the traveling direction of the small vehicle. Since the state is eliminated and the area capable of absorbing the magnetic field of the small vehicle is expanded, the detection sensitivity on both sides of the loop coil is increased.
Thereby, the overall detection sensitivity of the loop coil can be increased.

請求項３記載の発明では、上述のように、ループコイルの形状が車両の長手方向にむけて長い略長方形状であり、該略長方形の各辺が縦横格子状の鉄筋に対し傾斜角度を持って埋設配置されることで、上記請求項２と同様の効果が得られる他に、自転車や自動二輪車のように横幅が狭く進行方向に長い小車両の検知感度を高めることができるようになるという追加の効果が得られる。

In the invention according to claim 3, as described above, the shape of the loop coil is a substantially rectangular shape that is long in the longitudinal direction of the vehicle, and each side of the substantially rectangular shape has an inclination angle with respect to the reinforcing bars in a vertical and horizontal lattice shape. In addition to obtaining the same effect as in the second aspect, the detection sensitivity of a small vehicle having a narrow lateral width and a long traveling direction, such as a bicycle or a motorcycle, can be increased. An additional effect is obtained.

実施例１の金属物体検知用ループコイルの設置構造を示す平面図である。It is a top view which shows the installation structure of the loop coil for metal object detection of Example 1. FIG. 実施例２の金属物体検知用ループコイルの設置構造を示す平面図である。6 is a plan view showing an installation structure of a metal object detection loop coil of Embodiment 2. FIG. 実施例３の金属物体検知用ループコイルの設置構造を示す平面図である。6 is a plan view showing an installation structure of a metal object detection loop coil of Embodiment 3. FIG. 従来例の金属物体検知用ループコイルの設置構造を示す平面図である。It is a top view which shows the installation structure of the loop coil for metal object detection of a prior art example.

以下にこの発明の実施例を図面に基づいて説明する。
なお、この実施例では、自転車や自動二輪車の駐車場入り口の発券機５横の路面２に設置した場合について説明する。 Embodiments of the present invention will be described below with reference to the drawings.
In this embodiment, the case where the bicycle is installed on the road surface 2 next to the ticketing machine 5 at the entrance of the parking lot of a motorcycle or motorcycle will be described.

まず、この実施例１の金属物体検知用ループコイルの設置構造を図面に基づいて説明する。
この実施例１は、ループコイル１が車両進行方向に長い略長方形状であり、かつ、ループコイル１の埋設設置路面２に埋め込まれた縦横格子状の鉄筋３、４の一方の鉄筋３が車両の進行方向とほぼ平行する状態で埋設配置され、もう一方の鉄筋４が車両の進行方向とほぼ直交する状態で路面に埋設設置されている一般的なケースである。
そして、この実施例１のループコイル１は、その略長方形の各辺が鉄筋３、４に対し所定の傾斜角度を持って埋設配置されている。 First, the installation structure of the metal object detection loop coil according to the first embodiment will be described with reference to the drawings.
In the first embodiment, the loop coil 1 has a substantially rectangular shape which is long in the vehicle traveling direction, and one of the reinforcing bars 3 and 4 of the vertical and horizontal lattices embedded in the embedded road surface 2 of the loop coil 1 is the vehicle. This is a general case in which the other reinforcing bar 4 is embedded and installed on the road surface in a state substantially perpendicular to the traveling direction of the vehicle.
The loop coil 1 according to the first embodiment is embedded and arranged so that each side of the substantially rectangular shape has a predetermined inclination angle with respect to the reinforcing bars 3 and 4.

なお、鉄筋３、４に対するループコイル１の傾斜角度の値は任意であるが、実験の結果、３０±５度で最も全体的な感度が良好であった。   In addition, although the value of the inclination angle of the loop coil 1 with respect to the reinforcing bars 3 and 4 is arbitrary, as a result of the experiment, the overall sensitivity was the best at 30 ± 5 degrees.

次に、この実施例１の作用を説明する。
この実施例１の金属物体検知用ループコイルの設置構造では、上述のように構成されるため、自転車や自動二輪車などの小車両が駐車場入口の発券機５の前で停止すると、停止路面２に埋設されたループコイル１が発する磁界を、図外の検知装置で検知する。 Next, the operation of the first embodiment will be described.
Since the metal object detection loop coil installation structure of the first embodiment is configured as described above, when a small vehicle such as a bicycle or a motorcycle stops in front of the ticketing machine 5 at the parking lot entrance, the stop road surface 2 A magnetic field generated by the loop coil 1 embedded in the detector is detected by a detection device (not shown).

次に、この実施例１の効果を説明する。
この実施例１の金属物体検知用ループコイルの設置構造では、上述のように、ループコイル１の形状が車両の長手方向にむけて長い略長方形状であり、該略長方形の各辺が鉄筋３、４に対し所定の傾斜角度を持って埋設配置される。
このように、ループコイルの左右両辺１１、１１部分では一方の鉄筋３、３に沿わせた場合よりも鉄筋３、３への磁界の吸収が抑制されるため、ループコイル１の左右両辺１１、１１部分における車両の検知感度が高くなる。
また、ループコイル１の前後両辺１２、１２部分では小車両の進行方向に対する直交配置状態が解消され、小車両の磁界を吸収できる面積が拡がるため、ループコイル１の前後両辺１２、１２部分の検知感度が高くなる。
これにより、ループコイル１全体的な検知感度を高めることができる。 Next, the effect of the first embodiment will be described.
In the installation structure of the metal object detection loop coil of the first embodiment, as described above, the shape of the loop coil 1 is a substantially rectangular shape that is long in the longitudinal direction of the vehicle, and each side of the substantially rectangular shape is a reinforcing bar 3. 4 is embedded with a predetermined inclination angle.
Thus, since the absorption of the magnetic field to the rebars 3 and 3 is suppressed in the left and right sides 11 and 11 of the loop coil as compared with the case where the rebars 3 and 3 are aligned, the left and right sides 11 and 11 of the loop coil 1 are reduced. The detection sensitivity of the vehicle at the eleventh portion is increased.
Moreover, since the orthogonal arrangement | positioning state with respect to the advancing direction of a small vehicle is eliminated in the front and back both sides 12 and 12 part of the loop coil 1, and the area which can absorb the magnetic field of a small vehicle expands, the detection of the front and rear both sides 12 and 12 part of the loop coil 1 is carried out. Sensitivity is increased.
Thereby, the overall detection sensitivity of the loop coil 1 can be increased.

また、以上のように、ループコイル１の形状を略方形状とすることで、ループコイル１の各辺１１、１１、１２、１２の全てにおいて鉄筋３、４への磁界の吸収を抑制できると共に、ループコイル１のコイルを中心にして半径ｒの磁界が発生するので、コイル上の磁界を自転車や自動二輪車の金属部分が多く接するような形状のループコイル１を形成することで、全体的な検知感度を高めることができる。
さらに、ループコイル１の形状が車両の長手方向に向けて長い略長方形状とすることで、特に、自転車や自動二輪車のように横幅が狭く進行方向に長い小車両の検知感度を高めることができるようになる。
したがって、ループコイル１の巻き数を増やすことなしに、自転車や自動二輪車等の小車両の検知感度を高めることができるようになるという効果が得られる。 Further, as described above, by making the shape of the loop coil 1 substantially rectangular, absorption of the magnetic field to the reinforcing bars 3 and 4 can be suppressed in all the sides 11, 11, 12 and 12 of the loop coil 1. Since a magnetic field having a radius r is generated around the coil of the loop coil 1, the loop coil 1 having a shape in which a metal part of a bicycle or a motorcycle is in contact with the magnetic field on the coil is formed as a whole. Detection sensitivity can be increased.
Furthermore, by making the shape of the loop coil 1 a substantially rectangular shape that is long in the longitudinal direction of the vehicle, the detection sensitivity of a small vehicle having a narrow lateral width and a long traveling direction, such as a bicycle or a motorcycle, can be enhanced. It becomes like this.
Therefore, it is possible to increase the detection sensitivity of small vehicles such as bicycles and motorcycles without increasing the number of turns of the loop coil 1.

次に、他の実施例について説明する。この他の実施例の説明にあたっては、前記実施例１と同様の構成部分については図示を省略し、もしくは同一の符号を付けてその説明を省略し、相違点についてのみ説明する。   Next, another embodiment will be described. In the description of the other embodiments, the same components as those of the first embodiment are not shown, or the same reference numerals are given and the description thereof is omitted, and only the differences are described.

この実施例２は、実施例１における金属物体検知用ループコイルの設置構造の変形例を示すものである。
すなわち、この実施例２では、図２に示すように、ループコイル１の４つの辺１１、１１、１２、１２の全てが鉄筋３、４に対し所定の角度で傾斜する略菱形に埋設設置された例である。 The second embodiment shows a modification of the installation structure of the metal object detection loop coil in the first embodiment.
That is, in the second embodiment, as shown in FIG. 2, all the four sides 11, 11, 12, 12 of the loop coil 1 are embedded in a substantially rhombus that is inclined at a predetermined angle with respect to the reinforcing bars 3, 4. This is an example.

したがって、この実施例２においても、上記実施例１とほぼ同様の効果を得ることができる。   Therefore, also in the second embodiment, substantially the same effect as in the first embodiment can be obtained.

この実施例３は、実施例１における金属物体検知用ループコイルの設置構造の変形例を示すものである。
すなわち、この実施例３では、図３に示すように、ループコイル１の４つの辺１１、１１、１２、１２のうち、左右両辺１１、１１は鉄筋３に沿うが、前後両辺１２、１２は鉄筋３、４に対し所定の角度で傾斜する方形状に埋設設置された例である。
したがって、この実施例３では、左右両辺１１、１１部分が車両の進行方向と平行になるため、ループコイル１の左右両辺１１、１１部分における車両の検知感度が高くなる。
また、ループコイル１の前後両辺１２、１２部分では小車両の進行方向に対する直交配置状態が解消され、小車両の磁界を吸収できる面積が拡がるため、ループコイル１の前後両辺１２、１２部分の検知感度が高くなる。
これにより、ループコイル１の全体的な検知感度を高めることができる。 The third embodiment shows a modification of the installation structure of the metal object detection loop coil in the first embodiment.
That is, in Example 3, as shown in FIG. 3, among the four sides 11, 11, 12, and 12 of the loop coil 1, the left and right sides 11 and 11 are along the reinforcing bar 3, but the front and rear sides 12 and 12 are This is an example in which the reinforcing bars 3 and 4 are embedded in a square shape inclined at a predetermined angle.
Therefore, in the third embodiment, since the left and right sides 11 and 11 are parallel to the vehicle traveling direction, the vehicle detection sensitivity at the left and right sides 11 and 11 of the loop coil 1 is increased.
Moreover, since the orthogonal arrangement | positioning state with respect to the advancing direction of a small vehicle is eliminated in the front and back both sides 12 and 12 part of the loop coil 1, and the area which can absorb the magnetic field of a small vehicle expands, the detection of the front and rear both sides 12 and 12 part of the loop coil 1 is carried out. Sensitivity is increased.
Thereby, the overall detection sensitivity of the loop coil 1 can be increased.

以上本実施例を説明してきたが、本発明は上述の実施例に限られるものではなく、本発明の要旨を逸脱しない範囲の設計変更等があっても、本発明に含まれる。   Although the present embodiment has been described above, the present invention is not limited to the above-described embodiment, and design changes and the like within a scope not departing from the gist of the present invention are included in the present invention.

例えば、実施例では、ループコイルの形状を方形又は長方形とした例を示したが、ループコイルの少なくとも一部が鉄筋に対し所定の角度で傾斜していれば、その形状は任意であり、トラック状や、三角形状などであってもよい。
また、実施例では、鉄筋に対し所定の角度で傾斜する略直線部分を含むとしたが、完全な直線でなくても、僅かにカーブしていても含まれる。 For example, in the embodiment, an example in which the shape of the loop coil is a square or a rectangle is shown. However, if at least a part of the loop coil is inclined at a predetermined angle with respect to the reinforcing bar, the shape is arbitrary, and the track The shape may be a triangle or the like.
In addition, in the embodiment, it is assumed that a substantially straight portion that is inclined at a predetermined angle with respect to the reinforcing bar is included. However, even if it is not a complete straight line, it may be slightly curved.

１ ループコイル
１１ ループコイルの左右辺
１２ ループコイルの前後辺
２ 路面
３ 鉄筋
４ 鉄筋
５ 発券機 DESCRIPTION OF SYMBOLS 1 Loop coil 11 Left and right sides of loop coil 12 Front and rear sides of loop coil 2 Road surface 3 Reinforcement 4 Reinforcement 5 Ticketing machine

Claims (3)

駐車場入り口の発券機横の路面に埋設設置する金属物体検知用ループコイルの設置構造において、
前記ループコイルの埋設設置路面に埋め込まれた縦横格子状の鉄筋の一方の鉄筋が車両の進行方向とほぼ平行する状態で埋設配置され、もう一方の鉄筋が車両の進行方向とほぼ直交する状態で路面に埋設設置され、
前記ループコイルが埋設設置路面に埋め込まれた縦横格子状の鉄筋に対し傾斜する略直線部分を含む状態で埋設設置されていることを特徴とする金属物体検知用ループコイルの設置構造。 In the installation structure of the loop coil for detecting metal objects embedded in the road surface next to the ticketing machine at the entrance of the parking lot,
In the state where one reinforcing bar of the vertical and horizontal grid-like reinforcing bars embedded in the road surface where the loop coil is embedded is embedded in a state substantially parallel to the traveling direction of the vehicle, and the other reinforcing bar is substantially orthogonal to the traveling direction of the vehicle. Embedded in the road surface,
An installation structure of a loop coil for detecting a metal object, characterized in that the loop coil is embedded and installed in a state including a substantially straight portion inclined with respect to reinforcing bars in a vertical and horizontal lattice shape embedded in an embedded installation road surface . 請求項１に記載の金属物体検知用ループコイルの設置構造において、
前記ループコイルの形状が略方形であり、該略方形の各辺が縦横格子状の鉄筋に対し傾斜角度を持って埋設配置されていることを特徴とする金属物体検知用ループコイルの設置構造。 In the installation structure of the metal object detection loop coil according to claim 1,
An installation structure of a metal object detection loop coil, wherein the shape of the loop coil is a substantially square shape, and each side of the substantially square shape is embedded and arranged at an inclination angle with respect to reinforcing bars in a vertical and horizontal lattice shape . 請求項１または２に記載の金属物体検知用ループコイルの設置構造において、
前記ループコイルの形状が車両の長手方向にむけて長い略長方形状であり、該略長方形の各辺が縦横格子状の鉄筋に対し傾斜角度を持って埋設配置されていることを特徴とする金属物体検知用ループコイルの設置構造。 In the installation structure of the loop coil for metal object detection according to claim 1 or 2,
The shape of the loop coil is a substantially rectangular shape that is long in the longitudinal direction of the vehicle, and each side of the substantially rectangular shape is embedded and arranged at an inclination angle with respect to reinforcing bars in a vertical and horizontal lattice shape. Installation structure of loop coil for object detection.
JP2011233652A 2011-10-25 2011-10-25 Installation structure of loop coil for metal object detection Active JP5912405B2 (en)

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JPS6026461B2 (en) * 1979-12-07 1985-06-24 東京航空計器株式会社 Loop coil for vehicle detection equipment
JPH06338832A (en) * 1993-05-27 1994-12-06 Nippon Signal Co Ltd:The Loop coil type sensor
JPH0926481A (en) * 1995-07-10 1997-01-28 Nippon Signal Co Ltd:The Loop detector
US7026955B2 (en) * 2001-07-12 2006-04-11 Scott Kauffman Apparatus and method for activating an inductance loop vehicle detection system
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