JP2556371Y2 - Magnetic object detector - Google Patents
Magnetic object detectorInfo
- Publication number
- JP2556371Y2 JP2556371Y2 JP1989123234U JP12323489U JP2556371Y2 JP 2556371 Y2 JP2556371 Y2 JP 2556371Y2 JP 1989123234 U JP1989123234 U JP 1989123234U JP 12323489 U JP12323489 U JP 12323489U JP 2556371 Y2 JP2556371 Y2 JP 2556371Y2
- Authority
- JP
- Japan
- Prior art keywords
- axis
- magnetic
- coil
- magnetic field
- substance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Description
【考案の詳細な説明】 （イ）産業上の利用分野 この考案は、例えば地中等に埋蔵された磁性物等を探
知する磁性物探知器に関する。[Detailed description of the invention] (a) Industrial application field This invention relates to a magnetic substance detector for detecting a magnetic substance or the like buried in the ground, for example.
（ロ）従来の技術 従来、地中等の磁性物を探知するのに、差動形フラッ
クスゲート型磁力計やプロトン磁力計を用いて、磁性物
に近づいた場合の磁気出力の変化の大きさにより、磁性
物の有無を判別していた。(B) Conventional technology Conventionally, a differential fluxgate magnetometer or a proton magnetometer has been used to detect magnetic substances in the ground, etc., based on the magnitude of the change in magnetic output when approaching a magnetic substance. , The presence or absence of a magnetic substance was determined.
（ハ）考案が解決しようとする課題 一般に、永年放置された磁性物が持つモーメントは、
永年磁気モーメント分がほとんどなく、第３図に示すよ
うに磁性物１の磁気モーメントＭは、地磁気HMによる誘
導磁気モーメント分である。それゆえ、上記したように
差動形フラックスゲート型磁力計等を用いた場合、この
磁力計の出力が非常に小さく、磁性物の存在を検出し得
ない場合がある。(C) Problems to be solved by the present invention Generally, the moment of a magnetic material left for a long time is
Permanent magnetic moment worth almost no magnetic moment M of the magnetic material 1 as shown in FIG. 3 is an inductive magnetic moment caused by geomagnetism H M. Therefore, when a differential fluxgate magnetometer or the like is used as described above, the output of this magnetometer may be too small to detect the presence of a magnetic substance.
この考案は、上記問題点に着目してなされたものであ
って、より確実に磁性物を発見し得る磁性物探知器を提
供することを目的としている。The present invention has been made in view of the above problems, and has as its object to provide a magnetic substance detector that can more reliably detect a magnetic substance.
（ニ）課題を解決するための手段及び作用 この考案の磁性物探知器は、１個の磁気センサと、互
いに直交方向に設けられたＸ軸コイル、Ｙ軸コイル及び
Ｚ軸コイルからなる着磁コイルと、この着磁コイルのＸ
軸、Ｙ軸及びＺ軸コイルにそれぞれ電流を流すＸ軸電流
発生器、Ｙ軸電流発生器及びＺ軸電流発生器とを備え、
磁気センサのみで磁性物を探知し得ない場合は、Ｘ軸、
Ｙ軸及びＺ軸電流発生器によりＸ軸、Ｙ軸及びＺ軸コイ
ルにそれぞれ電流を流して合成磁界を発生させ、各軸の
コイルに流す電流を変化させることにより合成磁界の方
向を順に変化させて磁気センサで磁性物を探知するよう
にしたことを特徴とする。(D) Means and Action for Solving the Problems The magnetic object detector of the present invention is a magnetized device comprising one magnetic sensor and an X-axis coil, a Y-axis coil and a Z-axis coil provided in directions orthogonal to each other. Coil and X of this magnetized coil
An X-axis current generator, a Y-axis current generator, and a Z-axis current generator that allow current to flow through the axis, the Y-axis, and the Z-axis coil, respectively.
If a magnetic object cannot be detected only with a magnetic sensor,
The Y-axis and Z-axis current generators respectively flow currents through the X-axis, Y-axis and Z-axis coils to generate a synthetic magnetic field, and by changing the current flowing through the coils of each axis, the direction of the synthetic magnetic field is changed in order. The magnetic sensor detects a magnetic substance.
この磁性物探知器では、先ず着磁コイルの各軸のコイ
ルに電流を流さないで、磁気センサの出力のみで磁性物
の有無を判別する。しかし、磁性物が有と決定できない
場合は、Ｘ軸、Ｙ軸及びＺ軸電流発生器によりＸ軸、Ｙ
軸及びＺ軸コイルにそれぞれ電流を流して合成磁界を発
生させ、各軸のコイルに流す電流を変化させることによ
り合成磁界の方向を順に変化させて、磁気センサの出力
により磁性物の有無を判別する。磁性物が存在する場合
に、合成磁界を発生させると、その磁性物が磁化され、
永久磁気モーメント分が地磁気による誘導磁気モーメン
トよりかなり大きくなることがあり、この永久磁気モー
メントを磁気センサで検出することにより、磁性物の有
を検出し得る。つまり、磁性物の存在を探知することが
できる。In this magnetic substance detector, the presence or absence of a magnetic substance is determined only by the output of the magnetic sensor without passing a current through the coils of the magnetized coils. However, when it cannot be determined that the magnetic substance is present, the X-axis, Y-axis, and Z-axis
A current is applied to each of the axis and Z-axis coils to generate a composite magnetic field, and the direction of the composite magnetic field is sequentially changed by changing the current flowing to the coil of each axis, and the presence or absence of a magnetic substance is determined based on the output of the magnetic sensor. I do. When a synthetic magnetic field is generated when a magnetic substance is present, the magnetic substance is magnetized,
The permanent magnetic moment may be considerably larger than the induced magnetic moment due to the terrestrial magnetism, and the presence of a magnetic substance can be detected by detecting the permanent magnetic moment with a magnetic sensor. That is, the presence of a magnetic substance can be detected.
（ホ）実施例 以下、実施例により、この考案をさらに詳細に説明す
る。(E) Example Hereinafter, the present invention will be described in more detail with reference to examples.
第１図は、この考案の一実施例を示す磁性物探知器の
構成を示す概略図である。この実施例磁性物探知器10
は、磁気センサ11と着磁装置12とから構成されている。
磁気センサ11としては、例えば差動型フラックスゲート
磁力計が使用される。着磁装置12は制御装置13と、着磁
コイル14から構成されている。磁気センサ11と着磁コイ
ル14は基台15上に配置されている。制御装置13は、種々
の制御動作を実行するコントローラ16とＸ軸電流発生器
17X、Ｙ軸電流発生器17Y、Ｚ軸電流発生器17Zから構成
されている。また着磁コイル14はＸ軸コイル14X、Ｙ軸
コイル14Y、Ｚ軸コイル14Zから構成されている。そして
コントローラ16では各電流発生器17X、17Y、17Zに流す
電流をプログラムしておくことにより、着磁コイル14に
よる着磁方向を所望の方向に任意に変更し得る機能を備
えている。FIG. 1 is a schematic diagram showing a configuration of a magnetic object detector showing one embodiment of the present invention. This embodiment magnetic substance detector 10
Is composed of a magnetic sensor 11 and a magnetizing device 12.
As the magnetic sensor 11, for example, a differential fluxgate magnetometer is used. The magnetizing device 12 includes a control device 13 and a magnetizing coil 14. The magnetic sensor 11 and the magnetizing coil 14 are arranged on a base 15. The control device 13 includes a controller 16 for executing various control operations and an X-axis current generator.
It comprises a 17X, Y-axis current generator 17Y and a Z-axis current generator 17Z. The magnetizing coil 14 includes an X-axis coil 14X, a Y-axis coil 14Y, and a Z-axis coil 14Z. The controller 16 has a function of programming the current flowing through each of the current generators 17X, 17Y, and 17Z so that the magnetization direction of the magnetization coil 14 can be arbitrarily changed to a desired direction.
次に、第２図に示すフロー図により上記実施例磁性物
検出探知器の動作について説明する。まず、制御装置13
から着磁コイル14に何らの電流も流さない状態で磁界の
検出を磁気センサ11で行う（ステップST1）。この磁気
センサ11の磁界検出により磁性物１からの磁界が検出さ
れる。この磁性物１の着磁前の磁界の強さが磁気センサ
11で検出され、予め定める磁性物の存在を規定する所定
値以上であるか否か判定し（ステップST2）、もし所定
値以上であれば、着磁装置12を動作させるまでもなく、
磁性物１発見を決定し（ステップST3）、動作を終了す
る。これに対し、磁気センサ11のみで、つまり着磁装置
12を動作させない状態では、磁性物１からの磁界の出力
が所定値以上でない場合（ステップST2）、つまり磁性
物発見を決定でき得ない場合には、次に制御装置13より
予め定めた第１の方向の着磁磁界を発生させる（ステッ
プST4）。この磁界の着磁磁界の方向は、コントローラ1
6で予めＸ軸電流発生器17X、Ｙ軸電流発生器17Y、Ｚ軸
電流発生器17Zにそれぞれ所定の電流を流すことによっ
て、着磁コイル14の各コイルに発生する磁界の合成値が
所定の予定する方向に数段階に切り替えられるように設
定されている。したがってまず予定の第１の方向の着磁
磁界を着磁コイル14によって発生させる。これにより磁
性物１は磁化され、地磁気HMによる誘導磁界とは別に永
久磁気モーメントが発生し、この永久磁気モーメントが
地磁気による誘導磁気モーメントよりも大きくなる場合
があるので、この磁性物１の永久磁気モーメントによ
り、磁気センサ11がこれを検出する。したがって磁界の
検出を行い（ステップST5）、その磁界値が所定値以上
か否かを判定し（ステップST6）、これが所定値以上で
あると、磁性物１が存在したということ、つまり発見決
定し（ステップST7）、動作を終了する。しかし、第１
の方向の着磁では、まだ磁性物１の磁界が所定値以上と
ならない場合には、ステップST6の判定がNOとなり、次
に予め定めた方向の着磁磁界のすべてを発生させたか否
かを判定する（ステップST8）。最初、第１の方向のみ
の着磁なので判定NOであり、次の予め定めた次の方向の
着磁磁界を発生させる。これにより着磁磁界の方向を若
干ずらせて再びステップST5に戻り磁界の検出を行い、
先と同様にその磁界、つまり磁気センサ11で検出される
磁界の強さが所定値以上か否か判定し、所定値以上でな
い場合には、予め定めた方向の着磁磁界のすべてを発生
させるまで、着磁磁界の方向を順次ずらせて、上記ステ
ップST5乃至ステップST9の処理を繰り返す。その過程
で、磁界検出値が所定値以上であると、先と同様に磁性
物発見の決定を行い（ステップST7）、動作は終了す
る。しかし、予め定めた方向の着磁磁界のすべてを発生
させても、なお磁界が所定値を越えない場合、ステップ
ST8の判定がYESとなり、この場合は、近傍に磁性物なし
の決定をし（ステップST10）、動作を終了する。Next, the operation of the magnetic substance detection detector of the above embodiment will be described with reference to the flowchart shown in FIG. First, the control device 13
The magnetic field is detected by the magnetic sensor 11 in a state where no current flows through the magnetizing coil 14 from step (ST1). The magnetic field from the magnetic substance 1 is detected by the magnetic field detection of the magnetic sensor 11. The strength of the magnetic field before magnetization of the magnetic substance 1 is determined by the magnetic sensor.
It is detected at 11, it is determined whether or not it is equal to or more than a predetermined value that defines the presence of a predetermined magnetic substance (step ST2), if it is equal to or more than the predetermined value, it is not necessary to operate the magnetizing device 12,
The magnetic substance 1 is determined to be found (step ST3), and the operation ends. On the other hand, only the magnetic sensor 11
In a state where the magnetic material 12 is not operated, if the output of the magnetic field from the magnetic substance 1 is not equal to or more than the predetermined value (step ST2), that is, if it is not possible to determine the magnetic substance discovery, the control device 13 then determines the first (Step ST4). The direction of the magnetizing magnetic field of this magnetic field
By passing predetermined currents through the X-axis current generator 17X, the Y-axis current generator 17Y, and the Z-axis current generator 17Z in advance in step 6, the combined value of the magnetic field generated in each coil of the magnetizing coil 14 becomes a predetermined value. It is set so that it can be switched in several steps in the expected direction. Therefore, first, a magnetizing magnetic field in a predetermined first direction is generated by the magnetizing coil 14. Thus magnetic material 1 is magnetized, separately generated permanent magnetic moment to the induced magnetic field by the geomagnetism H M, since the permanent magnetic moment may be larger than induced magnetic moment due to terrestrial magnetism, the permanent of the magnetic substance 1 The magnetic moment is detected by the magnetic sensor 11 based on the magnetic moment. Therefore, a magnetic field is detected (step ST5), and it is determined whether or not the magnetic field value is equal to or more than a predetermined value (step ST6). (Step ST7), the operation ends. But the first
If the magnetic field of the magnetic substance 1 has not yet reached a predetermined value or more in the magnetization in the direction of NO, the determination in step ST6 is NO, and it is determined whether all the magnetization magnetic fields in the predetermined direction have been generated next. A determination is made (step ST8). At first, since the magnetization is performed only in the first direction, the determination is NO, and a magnetization magnetic field in the next predetermined next direction is generated. This slightly shifts the direction of the magnetizing magnetic field, and returns to step ST5 again to detect the magnetic field.
Similarly to the above, it is determined whether or not the magnetic field, that is, the strength of the magnetic field detected by the magnetic sensor 11 is equal to or greater than a predetermined value, and if it is not equal to or greater than the predetermined value, all the magnetizing magnetic fields in a predetermined direction are generated. Until the direction of the magnetizing magnetic field is sequentially shifted, the processes of steps ST5 to ST9 are repeated. In the process, if the detected magnetic field value is equal to or more than the predetermined value, a determination to find a magnetic substance is made in the same manner as above (step ST7), and the operation ends. However, if the magnetic field still does not exceed the predetermined value even if all the magnetizing magnetic fields in the predetermined direction are generated, step
The determination in ST8 is YES, and in this case, it is determined that there is no magnetic substance nearby (step ST10), and the operation ends.
（ヘ）考案の効果 この考案の磁性物探知器によれば、磁気センサのみで
磁性物を探知し得ない場合には、Ｘ軸、Ｙ軸及びＺ軸電
流発生器によりＸ軸、Ｙ軸及びＺ軸コイルにそれぞれ電
流を流して合成磁界を発生させ、各軸のコイルに流す電
流を変化させることにより合成磁界の方向を順に変化さ
せて磁気センサで磁性物を探知するようにしたので、従
来の探知器に比べて、磁性物の形状にかかわらず、磁性
物の存在をより確実に、しかも小さなものまで検出する
ことができる。又、磁気センサも、着磁コイルとは離し
て１個設けるだけでよく、簡便である。(F) Effect of the invention According to the magnetic object detector of the invention, when a magnetic substance cannot be detected only by the magnetic sensor, the X-axis, Y-axis, and Z-axis current generators are used to detect the X-axis, Y-axis, Since current is applied to each Z-axis coil to generate a combined magnetic field, and the current applied to each axis coil is changed, the direction of the combined magnetic field is changed in order to detect magnetic substances with a magnetic sensor. As compared with the detector of the above, the presence of the magnetic substance can be detected more reliably and even to a small size regardless of the shape of the magnetic substance. Also, it is only necessary to provide one magnetic sensor apart from the magnetizing coil, which is simple.
【図面の簡単な説明】 第１図は、この考案の一実施例を示す磁性物探知器の概
略構成を示す図、第２図は、同磁性物探知器の動作を説
明するためのフロー図、第３図は、磁性物の磁気誘導モ
ーメントを説明するための図である。 11:磁気センサ、12:着磁装置、13:制御装置、14:着磁コ
イル。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing a schematic configuration of a magnetic substance detector showing one embodiment of the present invention, and FIG. 2 is a flowchart for explaining the operation of the magnetic substance detector. FIG. 3 is a diagram for explaining the magnetic induction moment of a magnetic substance. 11: magnetic sensor, 12: magnetizing device, 13: control device, 14: magnetizing coil.
Claims (1)
けられたＸ軸コイル、Ｙ軸コイル及びＺ軸コイルからな
る着磁コイルと、この着磁コイルのＸ軸、Ｙ軸及びＺ軸
コイルにそれぞれ電流を流すＸ軸電流発生器、Ｙ軸電流
発生器及びＺ軸電流発生器とを備え、磁気センサのみで
磁性物を探知し得ない場合は、Ｘ軸、Ｙ軸及びＺ軸電流
発生器によりＸ軸、Ｙ軸及びＺ軸コイルにそれぞれ電流
を流して合成磁界を発生させ、各軸のコイルに流す電流
を変化させることにより合成磁界の方向を順に変化させ
て磁気センサで磁性物を探知するようにしたことを特徴
とする磁性物探知器。1. A magnetic sensor, a magnetized coil comprising an X-axis coil, a Y-axis coil and a Z-axis coil provided in a direction orthogonal to each other, and the X-axis, Y-axis and Z-axis of the magnetized coil An X-axis current generator, a Y-axis current generator, and a Z-axis current generator, each of which allows a current to flow through the coil, and when a magnetic substance alone cannot detect a magnetic substance, the X-axis, Y-axis, and Z-axis currents A current is applied to each of the X-axis, Y-axis, and Z-axis coils by the generator to generate a composite magnetic field, and the direction of the composite magnetic field is changed in order by changing the current flowing through the coils of each axis, and the magnetic material is changed by the magnetic sensor. A magnetic object detector characterized in that it is adapted to detect a magnetic substance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1989123234U JP2556371Y2 (en) | 1989-10-20 | 1989-10-20 | Magnetic object detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1989123234U JP2556371Y2 (en) | 1989-10-20 | 1989-10-20 | Magnetic object detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0361592U JPH0361592U (en) | 1991-06-17 |
| JP2556371Y2 true JP2556371Y2 (en) | 1997-12-03 |
Family
ID=31671222
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1989123234U Expired - Fee Related JP2556371Y2 (en) | 1989-10-20 | 1989-10-20 | Magnetic object detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2556371Y2 (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56117178A (en) * | 1980-02-20 | 1981-09-14 | Shimadzu Corp | Metal detector |
| JP2526379B2 (en) * | 1987-10-07 | 1996-08-21 | 工業技術院長 | Active magnetic exploration method |
-
1989
- 1989-10-20 JP JP1989123234U patent/JP2556371Y2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0361592U (en) | 1991-06-17 |
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