JPH03279888A - Metal detector - Google Patents
Metal detectorInfo
- Publication number
- JPH03279888A JPH03279888A JP2078836A JP7883690A JPH03279888A JP H03279888 A JPH03279888 A JP H03279888A JP 2078836 A JP2078836 A JP 2078836A JP 7883690 A JP7883690 A JP 7883690A JP H03279888 A JPH03279888 A JP H03279888A
- Authority
- JP
- Japan
- Prior art keywords
- vibration
- output
- detection signal
- frequency distribution
- detector
- 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.)
- Granted
Links
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 32
- 239000002184 metal Substances 0.000 title claims abstract description 32
- 238000001514 detection method Methods 0.000 claims abstract description 33
- 230000001360 synchronised effect Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 150000002739 metals Chemical class 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- -1 ferrous metals Chemical class 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
Landscapes
- Geophysics And Detection Of Objects (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野]
この発明は、被検査体中の異物金属の有無を検知する金
属検出機に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a metal detector that detects the presence or absence of foreign metal in an object to be inspected.
〔従来の技術1
まず、従来から使用されている金属検出機の概要につい
て第3図により説明する。この図において、1は発振器
、2は前記発振器1に接続されている送信コイル、3a
、3bはこの送信コイル2に対向して配置されている受
信コイルで、この受信コイル3a、3bは送信コイル2
の交番磁界中におかれ、その磁力線が等しく鎖交するよ
うに配置されている。4a、4bは前記受信コイル3a
、3bの誘起電圧61.み2の位相および振幅の調整用
のボリュームを示し、このボリューム4a、4bの調整
によって通常はe+ ez=0となるように設定され
る。5は差動誘起電圧み。[Prior Art 1] First, an outline of a conventionally used metal detector will be explained with reference to FIG. In this figure, 1 is an oscillator, 2 is a transmitting coil connected to the oscillator 1, and 3a
, 3b are receiving coils arranged opposite to this transmitting coil 2;
They are placed in an alternating magnetic field and arranged so that the lines of magnetic force are equally interlinked. 4a and 4b are the receiving coils 3a
, 3b induced voltage 61. 2 shows a volume for adjusting the phase and amplitude of the signal 2, and is normally set so that e+ez=0 by adjusting the volumes 4a and 4b. 5 is the differential induced voltage.
−62を増幅する増幅器、6a、6bはそれぞれ鉄およ
び非鉄金属を検出する同期検波器、7a。6a and 6b are synchronous detectors that detect ferrous and non-ferrous metals, respectively; 7a;
7bは2〜20Hz程度のアナログフィルタ、8a、8
bは判別回路である。なお、9a、9bは前記同期検波
器6a、6bに供給する同期信号を形成する第1.第2
の移相器を示す。7b is an analog filter of about 2 to 20Hz, 8a, 8
b is a discrimination circuit. Note that 9a and 9b are the first synchronous signals that are supplied to the synchronous detectors 6a and 6b. Second
shows a phase shifter.
e F l e gは同期検波信号である。e F l e g is a synchronous detection signal.
かかる構成からなる金属検出機は、送信コイル2および
受信コイル3a、3b間に被検査体Wが通過し、該被検
査体Wに金属が混入している時はその金属の種H(鉄ま
たは非鉄)によって判別回路8aまたは8bに検出信号
が発生する。In a metal detector having such a configuration, an object W to be inspected passes between the transmitting coil 2 and receiving coils 3a and 3b, and when a metal is mixed in the object W to be inspected, the metal type H (iron or A detection signal is generated in the discrimination circuit 8a or 8b depending on the type of metal (non-ferrous metal).
この点を第4図(a)、(b)のベクトル図で説明する
と、通常、受信コイル3a、3bの誘起電圧e++eg
は増幅器5の入力側において61e m = Oとなる
ように設定されているが、鉄を含んだ被検査体Wが矢印
の方向から通過すると。To explain this point using the vector diagrams in FIGS. 4(a) and 4(b), normally, the induced voltage e++eg of the receiving coils 3a and 3b
is set so that 61e m = O on the input side of the amplifier 5, but when the object W to be inspected containing iron passes from the direction of the arrow.
まず、第4図(a)に示すように、受信コイル3aの誘
起電圧み、がミ′、に増大し、次に、受信コイル3bの
誘起電圧み2がa′冨に増大する。First, as shown in FIG. 4(a), the induced voltage in the receiving coil 3a increases to m', and then the induced voltage in the receiving coil 3b increases to a'.
したがって、み1−み富=みotの差動誘起電圧が同期
検波器6aに入力され、この同期検波器6aに供給され
ている同位相の同期検波信号み、によって検出される。Therefore, a differential induced voltage of Mi1 - Mito = Miot is input to the synchronous detector 6a, and detected by the same phase synchronous detection signal supplied to the synchronous detector 6a.
一方、非鉄金属(ステンレス、アルミ等)が混入した被
検査体Wが通過すると、発振器1の交番磁界の影響を受
けて非鉄金属内に渦電流が流れる。すると、この渦電流
の影響によって受信コイル3a、3bの誘起電圧e+、
exの位相が変化することになる。On the other hand, when the inspected object W containing non-ferrous metal (stainless steel, aluminum, etc.) passes through, an eddy current flows in the non-ferrous metal under the influence of the alternating magnetic field of the oscillator 1. Then, due to the influence of this eddy current, the induced voltage e+ in the receiving coils 3a, 3b,
The phase of ex will change.
すなわち、第4図(b)に示すように、受信コイル3a
の誘起電圧み、の位相がみ、に変化すると、差動誘起電
圧a″t e2”ebsは図示したように、はぼ90
″位相がずれた点に発生する。そこで、この差動誘起電
圧み。とほぼ同相となっているみ、で示す同期検波信号
が供給されている同期検波器6bにおいて位相検波する
ことにより非鉄金属を検出することができる。That is, as shown in FIG. 4(b), the receiving coil 3a
When the phase of the induced voltage a″t e2″ebs changes to , the differential induced voltage a″t e2″ebs becomes approximately 90° as shown in the figure.
``The differential induced voltage is generated at a point where the phase is shifted.Therefore, this differential induced voltage is almost in phase with the non-ferrous metal. can be detected.
[発明が解決しようとする課題]
上記の従来の金属検出機において、被検査体Wを搬送す
るためのベルトによる床振動などの振動が検出部分に加
わると、受信コイル3a、3bに検出信号が発生して、
これにより誤検出となる問題があった。[Problems to be Solved by the Invention] In the conventional metal detector described above, when vibrations such as floor vibrations caused by the belt for conveying the object W to be inspected are applied to the detection part, a detection signal is sent to the receiving coils 3a and 3b. Occurred,
This caused a problem of false detection.
第2図は振動に起因して発生する検出信号と、物品(非
被検査体W)または金属に起因して発生する検出信号と
を示すものである。曲線Iは物品、金属の検出信号の概
略を示すもので、物品と金属とが弁別できることは上述
したとおりである0曲線■、■は衝撃による検出信号を
示している。これかられかるように、衝撃と、物品・金
属とでは検出信号の周波数分布が相違している。曲線H
のような衝撃の場合には、フィルタにより容易に曲#!
Iの物品・金属の検出信号と区別することができるが、
曲線■の衝撃の場合にはある程度の除去できても、低周
波成分は通過してしまうため、物品・金属の検出信号の
S/Nが悪化するという問題点があった。なお、曲線I
のピーク値の周波数はおよそ8〜10Hz、曲線■の最
高周波数は50Hz程度である。FIG. 2 shows a detection signal generated due to vibration and a detection signal generated due to an article (non-inspected object W) or metal. Curve I shows the outline of the detection signal of articles and metals, and as mentioned above, it is possible to distinguish between articles and metals.Curves 2 and 2 indicate detection signals caused by impact. As will be seen, the frequency distribution of the detection signal is different between an impact and an article/metal. curve H
In case of shock, the filter makes the song easier!
It can be distinguished from the detection signal of articles/metals in I.
In the case of the impact shown by curve (2), even if it can be removed to some extent, the low frequency component passes through, resulting in a problem that the S/N ratio of the detection signal of the article/metal deteriorates. In addition, curve I
The frequency of the peak value of is approximately 8 to 10 Hz, and the highest frequency of curve (2) is approximately 50 Hz.
この発明は、上記の問題点を解決するためになされたも
ので、振動により誤動作しない金属検出機を提供するこ
とを目的とする。This invention was made to solve the above problems, and an object thereof is to provide a metal detector that does not malfunction due to vibration.
この発明にかかる金属検出機は、被検査体の検出信号の
周波数分布特性波形検出器と、あらかじめ被検査体の検
出信号の周波数分布特性波形を記憶したメモリと、周波
数分布特性波形検出器の出力と前記メモリの出力との差
をとる比較器と、この比較器の出力の周波数成分から検
出信号が振動によるものか否かを判定する振動判別回路
と、振動の信号を除去する信号短絡回路とを設けたもの
である。The metal detector according to the present invention includes a frequency distribution characteristic waveform detector of a detection signal of an object to be inspected, a memory storing in advance a frequency distribution characteristic waveform of a detection signal of the object to be inspected, and an output of the frequency distribution characteristic waveform detector. and the output of the memory, a vibration discrimination circuit that determines whether the detected signal is due to vibration from the frequency component of the output of the comparator, and a signal short circuit that removes the vibration signal. It has been established.
この発明においては、検出信号の周波数分布特性から被
検査体か、振動がが検出される。In this invention, the vibration of the object to be inspected is detected from the frequency distribution characteristics of the detection signal.
〔実施例1 第1図はこの発明の一実施例を示すブロック図である。[Example 1 FIG. 1 is a block diagram showing one embodiment of the present invention.
この図で、符号1〜7a、7bおよび9a、9bは第3
図と同じものであり、1oはA/D変換器、11は周波
数分布特性波形検出器で、高速フーリエ変換(FFT)
処理をディジタル化された信号に施し、各周波数に対す
る波高値をディジタル的に検出し記憶する。12は前記
被検査体W(物品・金属)の周波数分布特性波形をあら
かじめディジタル的に前記周波数分布特性波形検出器1
1と同様にして記憶させであるメモリである。13は比
較器で、周波数分布特性波形検出器11の出力とメモリ
12の出力の差、つまり同じ周波数におけるピーク値の
差を求めるものである。14は振動判別回路で、比較器
13の出力のピーク値の周波数から振動による検出信号
か否かを判定し、振動であると判定した場合にはフィル
タおよび信号短絡回路15a、15bの出力を停止させ
る。In this figure, symbols 1 to 7a, 7b and 9a, 9b are the third
It is the same as the figure, 1o is an A/D converter, 11 is a frequency distribution characteristic waveform detector, and fast Fourier transform (FFT)
Processing is applied to the digitized signal, and the peak value for each frequency is digitally detected and stored. The frequency distribution characteristic waveform detector 1 12 digitally detects the frequency distribution characteristic waveform of the object W (article/metal) to be inspected in advance.
This is a memory that stores data in the same way as 1. 13 is a comparator which determines the difference between the output of the frequency distribution characteristic waveform detector 11 and the output of the memory 12, that is, the difference between peak values at the same frequency. Reference numeral 14 denotes a vibration discrimination circuit, which judges whether or not the detection signal is caused by vibration from the frequency of the peak value of the output of the comparator 13, and stops the output of the filter and signal shorting circuits 15a and 15b if it is judged to be vibration. let
次に、第1図の実施例の動作について説明する。アナロ
グフィルタ7a、7bの出力は、A/D変換器10でデ
ィジタル信号に交換され、周波数分布特性波形検出器1
1でその周波数分布特性波形が検出され記憶される。次
いで、周波数分布特性波形検出器11の出力と、あらか
じめメモリ12に記憶されている物品、金属の周波数分
布特性波形とが比較される。この場合、検出信号が物品
、金属によるものであれば、比較器13の出力はほとん
どなくなるが、振動によるものであれば第2図の曲線■
または■と曲線■との差を求めることになるために、曲
線■、■のいずれでも高い周波数側にピークが残る。し
たがって、検出信号は振動であると振動判別回路14が
判定し、フィルタおよび信号短絡回路15a、15bが
出力を出さないように制御する。このようにして、たと
え振動による検出信号が発生してもこれは無視され、そ
のため誤検出は防止される。Next, the operation of the embodiment shown in FIG. 1 will be explained. The outputs of the analog filters 7a and 7b are exchanged into digital signals by the A/D converter 10, and are converted into digital signals by the frequency distribution characteristic waveform detector 1.
1, the frequency distribution characteristic waveform is detected and stored. Next, the output of the frequency distribution characteristic waveform detector 11 is compared with the frequency distribution characteristic waveform of the article or metal stored in the memory 12 in advance. In this case, if the detection signal is caused by an article or metal, the output of the comparator 13 will almost disappear, but if it is caused by vibration, the curve
Alternatively, since the difference between ■ and curve ■ is calculated, a peak remains on the high frequency side of both curves ■ and ■. Therefore, the vibration discrimination circuit 14 determines that the detection signal is vibration, and controls the filter and signal shorting circuits 15a and 15b so that they do not output. In this way, even if a detection signal due to vibrations occurs, it is ignored, thereby preventing false detections.
〔発明の効果1
この発明は、以上詳細に説明したように、被検査体の検
出信号の周波数分布特性波形検出器と、あらかじめ被検
査体の検出信号の周波数分布特性波形を記憶したメモリ
と、前記周波数分布特性波形検出器の出力と前記メモリ
の出力との差をとる比較器と、この比較器の出力の周波
数成分から検出信号が振動によるものか否かを判定する
振動判別回路と、振動の信号を除去する信号短絡回路と
を設けたので、振動による誤検出を確実に防止でき、精
度の高い金属検出を行いつる優れた効果がある。[Effect of the Invention 1] As explained in detail above, the present invention includes a frequency distribution characteristic waveform detector of a detection signal of an object to be inspected, a memory that stores in advance a frequency distribution characteristic waveform of a detection signal of an object to be inspected, a comparator that takes the difference between the output of the frequency distribution characteristic waveform detector and the output of the memory; a vibration discrimination circuit that determines whether the detected signal is due to vibration from the frequency component of the output of the comparator; Since a signal short circuit is provided to remove the signal, erroneous detection due to vibration can be reliably prevented and metal detection can be performed with high precision, which is an excellent effect.
第1図はこの発明の一実施例を示すブロック図、第2図
は第1図の実施例の動作説明のための波形図、第3図は
従来の金属検出機の一例を示すブロック図、第4図(a
)、(b)は、第3図の検出動作を説明するためのブロ
ック図である。
図中、1は発振器、2は送信コイル、3a。
3bは受信コイル、4a、4bはボリューム、5は増幅
器、6a、6bは同期検波器、7a。
7bはアナログフィルタ、9a、9bは第1.第2の移
相器、10はA/D変換器、11は周波数分布特性波形
検出器、12はメモリ、13は比較器、14は振動判別
回路、15a、15bはフィルタおよび信号短絡回路で
ある。
第
2
図
第
(a)
2
ei′FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a waveform diagram for explaining the operation of the embodiment of FIG. 1, and FIG. 3 is a block diagram showing an example of a conventional metal detector. Figure 4 (a
) and (b) are block diagrams for explaining the detection operation in FIG. 3. In the figure, 1 is an oscillator, 2 is a transmitting coil, and 3a. 3b is a receiving coil, 4a and 4b are volumes, 5 is an amplifier, 6a and 6b are synchronous detectors, and 7a. 7b is an analog filter, 9a and 9b are first . A second phase shifter, 10 is an A/D converter, 11 is a frequency distribution characteristic waveform detector, 12 is a memory, 13 is a comparator, 14 is a vibration discrimination circuit, 15a and 15b are a filter and a signal short circuit. . Figure 2 (a) 2 ei'
Claims (1)
る受信コイルとの間に被検査体を通過させ前記受信コイ
ルに得られる検出信号の大きさを判別回路で判別して異
物金属の検出を行う金属検出機において、前記被検査体
の検出信号の周波数分布特性波形検出器と、あらかじめ
被検査体の検出信号の周波数分布特性波形を記憶したメ
モリと、前記周波数分布特性波形検出器の出力と前記メ
モリの出力との差をとる比較器と、この比較器の出力の
周波数成分から検出信号が振動によるものか否かを判定
する振動判別回路と、振動の信号を除去する信号短絡回
路とを設けたことを特徴とする金属検出機。The object to be inspected is passed between a transmitting coil that generates an alternating magnetic field and a receiving coil that receives this alternating magnetic field, and a discrimination circuit discriminates the magnitude of the detection signal obtained from the receiving coil to detect foreign metal. In the metal detector, a frequency distribution characteristic waveform detector of the detection signal of the object to be inspected, a memory storing in advance a frequency distribution characteristic waveform of the detection signal of the object to be inspected, and an output of the frequency distribution characteristic waveform detector and the A comparator that takes the difference from the output of the memory, a vibration discrimination circuit that determines whether the detected signal is due to vibration from the frequency component of the output of the comparator, and a signal short circuit that removes the vibration signal are provided. A metal detector characterized by:
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7883690A JPH0830739B2 (en) | 1990-03-29 | 1990-03-29 | Metal detector |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7883690A JPH0830739B2 (en) | 1990-03-29 | 1990-03-29 | Metal detector |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH03279888A true JPH03279888A (en) | 1991-12-11 |
JPH0830739B2 JPH0830739B2 (en) | 1996-03-27 |
Family
ID=13672916
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP7883690A Expired - Fee Related JPH0830739B2 (en) | 1990-03-29 | 1990-03-29 | Metal detector |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0830739B2 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH08297170A (en) * | 1995-03-17 | 1996-11-12 | Hughes Missile Syst Co | Active impulse magnetometer |
JP2015111075A (en) * | 2013-12-06 | 2015-06-18 | アンリツ産機システム株式会社 | Diagnosis device of metal detector, and metal detector |
JP2020204482A (en) * | 2019-06-14 | 2020-12-24 | 株式会社ハシマ | Operation method of meter reader and meter reader |
CN112147703A (en) * | 2020-09-25 | 2020-12-29 | 湖北理工学院 | Metal detector |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58184542A (en) * | 1982-04-22 | 1983-10-28 | Toshiba Corp | System for detecting acoustic abnormality |
JPS6267484A (en) * | 1985-09-20 | 1987-03-27 | Asano Yukihiko | Method and apparatus for selectively detecting metal |
JPS6370138A (en) * | 1986-09-11 | 1988-03-30 | Hitachi Ltd | Leak detector |
-
1990
- 1990-03-29 JP JP7883690A patent/JPH0830739B2/en not_active Expired - Fee Related
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58184542A (en) * | 1982-04-22 | 1983-10-28 | Toshiba Corp | System for detecting acoustic abnormality |
JPS6267484A (en) * | 1985-09-20 | 1987-03-27 | Asano Yukihiko | Method and apparatus for selectively detecting metal |
JPS6370138A (en) * | 1986-09-11 | 1988-03-30 | Hitachi Ltd | Leak detector |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH08297170A (en) * | 1995-03-17 | 1996-11-12 | Hughes Missile Syst Co | Active impulse magnetometer |
JP2015111075A (en) * | 2013-12-06 | 2015-06-18 | アンリツ産機システム株式会社 | Diagnosis device of metal detector, and metal detector |
JP2020204482A (en) * | 2019-06-14 | 2020-12-24 | 株式会社ハシマ | Operation method of meter reader and meter reader |
CN112147703A (en) * | 2020-09-25 | 2020-12-29 | 湖北理工学院 | Metal detector |
Also Published As
Publication number | Publication date |
---|---|
JPH0830739B2 (en) | 1996-03-27 |
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