JPS63302360A - Electromagnetic ultrasonic transducer - Google Patents
Electromagnetic ultrasonic transducerInfo
- Publication number
- JPS63302360A JPS63302360A JP13865587A JP13865587A JPS63302360A JP S63302360 A JPS63302360 A JP S63302360A JP 13865587 A JP13865587 A JP 13865587A JP 13865587 A JP13865587 A JP 13865587A JP S63302360 A JPS63302360 A JP S63302360A
- Authority
- JP
- Japan
- Prior art keywords
- conductor
- transmission
- transmitting
- reception
- receiving
- 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
- 239000004020 conductor Substances 0.000 claims abstract description 97
- 239000000615 nonconductor Substances 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 abstract description 13
- 238000001514 detection method Methods 0.000 abstract description 12
- 239000003989 dielectric material Substances 0.000 abstract description 7
- 230000005415 magnetization Effects 0.000 abstract description 4
- 239000000463 material Substances 0.000 description 30
- 238000010586 diagram Methods 0.000 description 12
- 230000007547 defect Effects 0.000 description 7
- BGPVFRJUHWVFKM-UHFFFAOYSA-N N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] Chemical compound N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] BGPVFRJUHWVFKM-UHFFFAOYSA-N 0.000 description 6
- 230000004907 flux Effects 0.000 description 3
- 238000002604 ultrasonography Methods 0.000 description 3
- 230000003993 interaction Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
Landscapes
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の目的〕
（産業上の利用分野）
本発明は、超音波探傷試験に使用する電磁超音波トラン
スジューサに係り、とりわけ精度よく探傷試験を行なう
ことができる電磁超音波トランスジューサに関する。[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to an electromagnetic ultrasonic transducer used for ultrasonic flaw detection testing, and in particular an electromagnetic ultrasonic transducer that can perform flaw detection tests with high accuracy. Regarding transducers.
（従来の技術）
被検査材の溶接部等の超音波探傷試験を実施するには、
超音波トランスジューサを必要とする。(Conventional technology) In order to perform an ultrasonic flaw detection test on welded parts of the inspected material,
Requires ultrasound transducer.
このような超音波トランスジューサとしては、従来、種
々のタイプのものが提案されている。これら超音波トラ
ンスジューサの１つとして電磁超音波トランスジューサ
が知られている。この電磁超音波トランスジューサは、
磁歪素子や電歪素子を用いたものとは違って、ローレン
ッカで被検査材中に超音波を生起させるようにしたもの
で、被検査材とは非接触状態にセットできるという特徴
を備えている。したがって、被検査材の表面に凹凸が存
在しているような場合でも格別な処置などを施すことな
く試験を実施することができる。Various types of ultrasonic transducers have been proposed in the past. An electromagnetic ultrasonic transducer is known as one of these ultrasonic transducers. This electromagnetic ultrasound transducer is
Unlike those that use magnetostrictive elements or electrostrictive elements, this device uses a low roller to generate ultrasonic waves in the material to be inspected, and has the feature that it can be set without contacting the material to be inspected. . Therefore, even if the surface of the material to be inspected has irregularities, the test can be carried out without any special measures.
ところで、このような電磁超音波トランスジューサは、
通常、第７図に符号３ｏで示すように、永久磁石４と、
永久磁石４の着磁方向と直交する−側面に薄い電気絶縁
体２を介して積層固着された高周波電流路形成用の導電
体３とで構成されている。上記永久磁石４は厚み方法に
磁化されている。また上記導電体３は、第８図に示す如
く導電性帯片によりコ字形部分が互い違いに連続するよ
うジグザグ状に屈曲形成され、その分岐導電体３ａ、３
ｂ、３ｃ、・・・が一定距離（ピッチｐ）をおいて配置
されている。By the way, such an electromagnetic ultrasonic transducer is
Usually, as shown by reference numeral 3o in FIG. 7, a permanent magnet 4 and
A conductor 3 for forming a high frequency current path is laminated and fixed to the side surface of the permanent magnet 4 with a thin electric insulator 2 interposed therebetween, which is perpendicular to the magnetization direction of the permanent magnet 4. The permanent magnet 4 is magnetized in the thickness direction. Further, as shown in FIG. 8, the conductor 3 is bent in a zigzag shape using conductive strips so that the U-shaped portions are alternately continuous, and the branch conductors 3a, 3
b, 3c, . . . are arranged at a constant distance (pitch p).
そして、以上のように構成された電磁超音波トランスジ
ューサ３０を用いて被検査材２０の探傷試験を行なう場
合には、第７図に示すように高周波電流路を形成する導
電体３を、被検査材４の表面に所定の間隙１８をあけて
対向させ、導電体３の両端７，８を高周波電源および信
号送受信装置（いずれも図示せず）に接続する。When performing a flaw detection test on the material 20 to be inspected using the electromagnetic ultrasonic transducer 30 configured as described above, as shown in FIG. The conductor 3 is placed facing each other with a predetermined gap 18 on its surface, and both ends 7 and 8 of the conductor 3 are connected to a high frequency power source and a signal transmitting/receiving device (none of which are shown).
ここで、上記電磁超音波トランスジューサ３０の動作は
次の通りである。Here, the operation of the electromagnetic ultrasonic transducer 30 is as follows.
電磁超音波トランスジューサ３０を、その導電体３を被
検査＋４’ ２０の表面に対向させてセットすると、第
９図に破線矢印で示すように、永久磁石４から出た磁力
線１３が被検査材２０の表面に直角に入射する。従って
、被検査材２０の表面では、これと垂直なバイアス磁界
１５が印加された状態となる。次に、導電体３に高周波
電流を流すと、導電体３の、互いに平行な分岐導電体３
ａ、３ｂ。When the electromagnetic ultrasonic transducer 30 is set with its conductor 3 facing the surface of the material to be inspected 20, the lines of magnetic force 13 coming out of the permanent magnet 4 are directed to the surface of the material to be inspected 20, as shown by the dashed arrow in FIG. incident at right angles to the surface of Therefore, the bias magnetic field 15 perpendicular to the surface of the inspected material 20 is applied thereto. Next, when a high frequency current is passed through the conductor 3, the branch conductors 3 parallel to each other of the conductor 3
a, 3b.
３ｃ、・・・には、交互に逆向きの電流１２が流れる。3c, . . ., currents 12 in opposite directions alternately flow through them.
そこで、この電流１２により被検査材２０の表面には、
電流１２とは反対向きとなる、交互に逆向きの高周波の
誘導渦電流１４が流れる。そしてこの誘導渦電流１４と
バイアス磁界１５との相互作用によって、被検査材２０
内には、この被検査材２０の表面と平行となるローレン
ツ力１６が発生するが、このローレンツ力１６も交互に
逆位１目となる。この結果、被検査材２０に生起される
送信用超音波１７は横波で、かつ被検査材２０の表面に
垂直な方向に対して斜めの斜角ビームとなって伝播する
こととなる。Therefore, due to this current 12, on the surface of the material to be inspected 20,
Alternating high-frequency induced eddy currents 14 flow in opposite directions to the current 12 . The interaction between the induced eddy current 14 and the bias magnetic field 15 causes the inspected material 20 to
Inside, a Lorentz force 16 is generated that is parallel to the surface of the material to be inspected 20, but this Lorentz force 16 is also alternately reversed. As a result, the transmission ultrasonic waves 17 generated in the material to be inspected 20 are transverse waves and propagate as oblique beams oblique to the direction perpendicular to the surface of the material to be inspected 20 .
このような電磁超音波トランスジューサ３０を用いて溶
接部近傍の超音波探傷試験を行なう場合には、第１０図
に示すように電磁超音波トランスジューサ３０を配置す
る。すなわち、被検査材２０の溶接部３５の近傍に電磁
超音波トランスジューサ３０を配置し、送信用超音波１
７を送信する。送信用超音波１７は、欠陥３２があると
、反射をおこし受信用超音波２２として電磁超音波トラ
ンスジューサ３０に戻ってくる。このとき電磁超音波ト
ランスジューサ３０の導電体３の両端７゜８の電気波形
を観測すると、第１１図に示した電気波形が得られる。When conducting an ultrasonic flaw detection test near a weld using such an electromagnetic ultrasonic transducer 30, the electromagnetic ultrasonic transducer 30 is arranged as shown in FIG. That is, the electromagnetic ultrasonic transducer 30 is placed near the welded part 35 of the inspected material 20, and the transmitting ultrasonic wave 1 is
Send 7. When the transmitting ultrasonic wave 17 has a defect 32, it is reflected and returns to the electromagnetic ultrasonic transducer 30 as a receiving ultrasonic wave 22. At this time, when observing the electrical waveform at 7.8 degrees from both ends of the conductor 3 of the electromagnetic ultrasonic transducer 30, the electrical waveform shown in FIG. 11 is obtained.
第１１図で符号３３は電磁超音波トランスジューサ３０
を用いて超音波を送信するための送信パルスであり、符
号３４は欠陥３２からの反射パルスである。超音波探傷
試験においては反射パルス３４を検出して欠陥の有無を
判定すると同時に、送信パルス３３と反射パルス３４の
間の時間Ｔを測定して欠陥３２の位置を判別している。In FIG. 11, reference numeral 33 is an electromagnetic ultrasonic transducer 30.
This is a transmission pulse for transmitting an ultrasonic wave using , and reference numeral 34 is a reflected pulse from the defect 32 . In the ultrasonic flaw detection test, the presence or absence of a defect is determined by detecting the reflected pulse 34, and at the same time, the position of the defect 32 is determined by measuring the time T between the transmitted pulse 33 and the reflected pulse 34.
（発明が解決しようとする問題点）
上述したように、超音波探傷試験においては、第１１図
の反射パルス３４を検出して欠陥の有無を判断すると同
時に送信パルス３３と反射パルス３４の間の時間Ｔを測
定している。(Problems to be Solved by the Invention) As described above, in the ultrasonic flaw detection test, the reflected pulse 34 in FIG. 11 is detected to determine the presence or absence of a defect, and at the same time, the Time T is being measured.
一方、電磁超音波トランスジューサ３０の送信パルス３
３は、一般的にいって一定の持続時間Ｔ′を何している
。しかしながら、例えば薄板材等の探傷を行う場合には
送信パルス３３と反射パルス３４との時間Ｔが短くなり
、第１２図に示すようにＴ＜Ｔ’ となって反射パルス
３４が送信パルス３３の中に隠れてしまうことがある。On the other hand, the transmission pulse 3 of the electromagnetic ultrasonic transducer 30
3. Generally speaking, what is the constant duration T'? However, when performing flaw detection on thin plate materials, for example, the time T between the transmitted pulse 33 and the reflected pulse 34 becomes shorter, and as shown in FIG. Sometimes it hides inside.
このように反射パルス３４が送信パルス３３の中に隠れ
てしまうと、反射パルス３４が検出できず、精度よく超
音波探傷試験を行うことができないという問題がある。If the reflected pulse 34 is hidden in the transmitted pulse 33 in this way, there is a problem in that the reflected pulse 34 cannot be detected and an ultrasonic flaw detection test cannot be performed with high accuracy.
本発明はこのような点を考慮してなされたものであり、
精度よく探傷試験を行うことができる電磁超音波トラン
スジューサを提供することを１」的とする。The present invention has been made in consideration of these points,
Our objective is to provide an electromagnetic ultrasonic transducer that can perform flaw detection tests with high accuracy.
を発明の構成〕
（問題点を解決するだめの手段）
本発明は、導電性帯片によりコ字形部分が互い違いに連
続するようジグザグ状に屈曲形成された２種の導電体を
設け、永久磁石の着磁方向と直交する一側面に電気絶縁
体を介して一方の導電体を積層し、この一方の導電体に
電気絶縁体を介して他方の導電体をその分岐導電体が前
記一方の分岐導電体の間隔部分に整合するよう積層し、
さらに前記２種の導電体を送信用導電体および受信用導
電体に分けたことを特徴とする電磁超音波トランスジュ
ーサである。[Structure of the Invention] (Means for Solving the Problems) The present invention provides two types of conductors bent in a zigzag shape so that the U-shaped portions are alternately continuous by conductive strips, and a permanent magnet. One conductor is laminated on one side perpendicular to the magnetization direction with an electric insulator interposed therebetween, and the other conductor is connected to the one conductor through the electric insulator. Laminated to match the spacing of the conductor,
The electromagnetic ultrasonic transducer is further characterized in that the two types of conductors are divided into a transmitting conductor and a receiving conductor.
（作 用）
本発明によれば、超音波の送信と受信とを別個の導電体
によって行うので、送信パルスと反射パルスの干渉が防
止される。また受信用導電体はその分岐導電体が送信用
導電体の分岐導電体の間隔部分に整合するよう配置され
ているので、受信用導電体が送信用導電体に入力された
高周波によって影響を受けることはない。(Function) According to the present invention, since ultrasonic waves are transmitted and received by separate conductors, interference between transmitted pulses and reflected pulses is prevented. In addition, the receiving conductor is arranged so that its branch conductors match the spacing between the branch conductors of the transmitting conductor, so the receiving conductor is affected by the high frequency input to the transmitting conductor. Never.
（実施例）
以下、図面を参照して本発明の実施例について説明する
。(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.
第１図乃至第６図は本発明による電磁超音波トランスジ
ューサの一実施例を示す図である。第１図乃至第３図に
示すように、永久磁石１は厚み方向に磁化されており、
永久磁石１の着磁方向と直交する一側面に薄い電気絶縁
体２を介して送信用導電体３が積層固着されている。こ
の送信用導電体３は、導電性帯片によりコ字形部分が互
い違いに連続するようジグザグ状に屈曲形成され、その
送信用分岐導電体３ａ、 ３ｂ、 ３ｃ、・・・が一
定距離をおいて配置されている。1 to 6 are views showing one embodiment of an electromagnetic ultrasonic transducer according to the present invention. As shown in FIGS. 1 to 3, the permanent magnet 1 is magnetized in the thickness direction,
A transmission conductor 3 is laminated and fixed on one side of the permanent magnet 1 perpendicular to the magnetization direction with a thin electric insulator 2 interposed therebetween. This transmitting conductor 3 is bent in a zigzag shape using conductive strips so that the U-shaped portions are alternately continuous, and the transmitting branch conductors 3a, 3b, 3c, . . . are arranged at a certain distance. It is located.
また、送信用導電体３に薄い電気絶縁体５を介して受信
用導電体６が積層固着されている。この受信用導電体６
は送信用導電体３と同様、導電性帯片によりコ字形部分
が互い違いに連続するようジグザグ状に屈曲形成され、
その受信用分岐導電体６ａ、６ｂ、６ｃ、・・・が一定
距離をおいて配置されている。Further, a receiving conductor 6 is laminated and fixed to the transmitting conductor 3 with a thin electrical insulator 5 interposed therebetween. This receiving conductor 6
Similar to the transmitting conductor 3, the conductive strips are bent in a zigzag shape so that the U-shaped portions are alternately continuous.
The receiving branch conductors 6a, 6b, 6c, . . . are arranged at a certain distance.
この受信用導電体６は、受信用分岐導電体６ａ。This receiving conductor 6 is a receiving branch conductor 6a.
６ｂ、６ｃ、・・・が送信用導電体３の分岐導電体３ａ
、３ｂ、３ｃ、・・・の間隔部分に整合するよう配置さ
れている。すなわち、第３図に示すように、受信用導電
体６は送信用導電体３に対して半ビ・ソチずらしたもの
である。6b, 6c, . . . are branch conductors 3a of the transmitting conductor 3
, 3b, 3c, . . . That is, as shown in FIG. 3, the receiving conductor 6 is shifted by half a centimeter with respect to the transmitting conductor 3.
また、送信用導電体３の両端７，８は超音波送信器（図
示せず）に接続され、また受信用導電体６の両端９．１
０は超音波受信器（図示せず）に接続されている。Further, both ends 7 and 8 of the transmitting conductor 3 are connected to an ultrasonic transmitter (not shown), and both ends 9.1 of the receiving conductor 6 are connected to an ultrasonic transmitter (not shown).
0 is connected to an ultrasound receiver (not shown).
次にこのような構成からなる本実施例の作用について説
明する。Next, the operation of this embodiment having such a configuration will be explained.
第４図は電磁超音波トランスジューサ１を用いて超音波
を送信する場合の動作を示した図である。FIG. 4 is a diagram showing the operation when transmitting ultrasonic waves using the electromagnetic ultrasonic transducer 1.
電磁超音波トランスジューサ１を、その送信用導電体３
を被検査材２０の表面に対向させてセットすると、第４
図に破線矢印で示すように、永久磁石４から出た磁力線
１３が被検査材２０の表面に直角に入射する。従って、
被検査材２０の表面では、これと垂直なバイアス磁界１
５が印加された状態となる。次に、送信用導電体３に高
周波電流を流すと、送信用導電体３の、互いに平行な送
信用分岐導電体３ａ、３ｂ、３ｃ、・・・には、交互に
逆向きの電流１２が流れる。そこで、この電流１２によ
り被検査材２０の表面には、電流１２とは反対向きとな
る。交互に逆向きの高周波の誘導渦電流１４が流れる。The electromagnetic ultrasonic transducer 1 is connected to its transmitting conductor 3.
When set facing the surface of the material to be inspected 20, the fourth
As shown by the broken line arrow in the figure, the lines of magnetic force 13 coming out of the permanent magnet 4 are incident on the surface of the material to be inspected 20 at right angles. Therefore,
On the surface of the material to be inspected 20, a bias magnetic field 1 perpendicular to the surface is applied.
5 is applied. Next, when a high-frequency current is passed through the transmitting conductor 3, currents 12 in opposite directions alternately flow through the transmitting branch conductors 3a, 3b, 3c, etc., which are parallel to each other, of the transmitting conductor 3. flows. Therefore, this current 12 causes the surface of the inspected material 20 to flow in the opposite direction to the current 12. High-frequency induced eddy currents 14 alternately flow in opposite directions.
そしてこの誘導渦電流１４とバイアス磁界１５との相互
作用によって、被検査材２０内には、この被検査材２０
の表面に平行となるローレンツ力１６が発生するが、こ
のローレンツ力１６も交互に逆位相となる。この結果、
被検査材２０に生起される送信用超音波１７は横波で、
かつ被検査材２０の表面に直交する方向に対して斜めの
斜角ビームとなって伝播することとなる。Due to the interaction between the induced eddy current 14 and the bias magnetic field 15, the inside of the inspected material 20 is
Lorentz forces 16 are generated that are parallel to the surface of , but these Lorentz forces 16 also alternately have opposite phases. As a result,
The transmission ultrasonic wave 17 generated in the inspected material 20 is a transverse wave,
In addition, the beam propagates as an oblique beam oblique to the direction perpendicular to the surface of the material 20 to be inspected.
次に、被検査材２０内を伝播する送信用超音波１７は被
検査材２０内の欠陥に反射して受信用超音波２２として
戻ってくる。Next, the transmitting ultrasonic waves 17 propagating within the inspected material 20 are reflected by defects within the inspected material 20 and return as receiving ultrasonic waves 22 .
第５図は超音波を受信する場合の動作を示した図である
。第５図に示すように、被検査材２０の内部を伝搬して
きた受信用超音波２２が被検査材２０の表面に到達する
と、被検査材２０の表面では第５図に示すように振動２
３が発生する。続いてこの振動２３とバイアス磁界１５
が相互作用し、被検査材２０の表面に誘導渦電ｔＴｔ２
４が流れる。FIG. 5 is a diagram showing the operation when receiving ultrasonic waves. As shown in FIG. 5, when the receiving ultrasonic wave 22 that has propagated inside the material to be inspected 20 reaches the surface of the material to be inspected 20, the surface of the material to be inspected 20 produces vibrations 2 as shown in FIG.
3 occurs. Next, this vibration 23 and bias magnetic field 15
interact, and an induced eddy current tTt2 is generated on the surface of the inspected material 20.
4 flows.
この渦電流２４により間隙１８には高周波磁界２５が発
生する。この高周波磁界２５は、対応する受信用分岐導
電体６ａ、６ｂ、６ｃ、・・・毎に交互に逆向きとなる
。This eddy current 24 generates a high frequency magnetic field 25 in the gap 18 . This high frequency magnetic field 25 is alternately directed in opposite directions for each corresponding receiving branch conductor 6a, 6b, 6c, . . . .
高周波磁界２５が受信用導電体６の受磁部２９（受信用
分岐導電体６の相互間の部分）を通過すると、受信用導
電体６の両端９，１０に電圧が誘起され受信用超音波２
２が受信される。When the high-frequency magnetic field 25 passes through the magnetic receiving part 29 of the reception conductor 6 (the part between the reception branch conductors 6), a voltage is induced at both ends 9 and 10 of the reception conductor 6, and the reception ultrasonic wave is 2
2 is received.
このように、超音波の送信は送信用導電体３に高周波電
流を流すことによって行なわれ、また超音波の受信は受
信用導電体６に電圧が誘起されることによって行なわれ
る。従って、超音波の送信と受信を別個の導電体３，６
によって行なうので、反射ペルスが送信パルスと千１歩
して隠れてしまうということはない。In this way, ultrasonic waves are transmitted by passing a high frequency current through the transmitting conductor 3, and ultrasonic waves are received by inducing a voltage in the receiving conductor 6. Therefore, ultrasonic waves are transmitted and received using separate conductors 3 and 6.
Therefore, there is no possibility that the reflected pulse will be hidden behind the transmitted pulse.
また、超音波の受信は受信用導電体６の受磁部２９によ
って行なわれるが、この受磁部２９は送信用導電体３に
入力された高周波電流によっては影響を受けない構造と
なっている。Further, reception of ultrasonic waves is performed by the magnetic receiving part 29 of the receiving conductor 6, but this magnetic receiving part 29 has a structure that is not affected by the high frequency current input to the transmitting conductor 3. .
すなわち、第６図に示すように、送信用導電体３に高周
波電流１２を流すと、高周波磁束２７が送信用分岐導電
体３ａ、３ｂ＋ ３Ｃ１・・・に対応してそれぞれ交
互に逆向きに発生する。この場合、受信用導電体６は送
信用導電体３と半ピツチずれて配置されているため、高
周波磁束２７は受信用導電体６の受磁部を通過しない。That is, as shown in FIG. 6, when high-frequency current 12 is passed through the transmitting conductor 3, high-frequency magnetic flux 27 is generated alternately in opposite directions corresponding to the transmitting branch conductors 3a, 3b+3C1, etc. do. In this case, since the receiving conductor 6 is arranged half a pitch away from the transmitting conductor 3, the high frequency magnetic flux 27 does not pass through the magnetic receiving portion of the receiving conductor 6.
このため、受信用導電体６の両端９．１０には、高周波
磁束２７による電圧は発生せず、送信用導電体３に人力
された高周波電流１２によっては影響を受けないことに
なる。Therefore, no voltage is generated at both ends 9.10 of the receiving conductor 6 due to the high frequency magnetic flux 27, and the receiving conductor 6 is not affected by the high frequency current 12 manually applied to the transmitting conductor 3.
このように、本実施例によれば、超音波の送信と受信を
別個の導電体３．６によって行なうので、反射パルスが
送信パルスと干渉してしまうことはない。また、受信用
導電体６は送信用導電体３と半ピツチずれて配置されて
いるため、受信用導電体６の受磁部２９は送信用導電体
に入力された高周波１２によっては影響を受けることは
ない。In this manner, according to this embodiment, since the ultrasonic waves are transmitted and received by separate conductors 3.6, the reflected pulses do not interfere with the transmitted pulses. In addition, since the receiving conductor 6 is arranged half a pitch apart from the transmitting conductor 3, the magnetic receiving part 29 of the receiving conductor 6 is affected by the high frequency 12 input to the transmitting conductor. Never.
本発明によれば、超音波の送信と受信とを別個の導電体
によって行なうので、反射パルスが送信パルスと干ルし
てかくれてしまうことはない。また、受信用導電体が送
信用導電体に入力された高周波によって影響を受けるこ
とはない。このため被検査材の表面近傍の欠陥箇所であ
っても適確かつ正確に探傷することができる。According to the present invention, since ultrasonic waves are transmitted and received using separate conductors, reflected pulses are not hidden behind transmitted pulses. Further, the receiving conductor is not affected by the high frequency input to the transmitting conductor. Therefore, even a defective location near the surface of the material to be inspected can be properly and accurately detected.
第１図は本発明による電磁超音波トランスジューサの一
実施例を示す側面図、第２図は第１図■−■線矢視図、
第３図は送信用導電体と受信用導電体の配置関係を示す
図、第４図は超音波を送信する場合の動作を示す図、第
５図は超音波を受信する場合の動作を示す図、第６図は
受信用導電体が送信用導電体に人力された高周波電流に
よって影響を受けないことを示す図、第７図は従来の電
磁超音波トランスジューサの側面図、第８図は第７図の
■−■線矢視図、第９図は超音波を送信する場合の動作
を示す図、第１０図は溶接部近傍の欠陥を探傷する場合
を示す図、第１１図は導電体の両端の電気波形を示す図
、第１２図は反射パルスが送信パルスに隠れてしまった
状態を示す図である。
１・・・電磁超音波トランスジューサ、２・・・電気絶
縁体、３・・・送信用導電体、４・・・永久磁石、５・
・・電気絶縁体、６・・・受信用導電体、］２・・・高
周波電流、１４・・・誘導渦電流、１５・・・バイアス
磁界、１６・・・ローレンツ力、１７・・送信用超音波
、２０・・・被検査材、２２・・・受信用超音波、２３
・・・振動、２４・・・誘導渦電流、２５・・・高周波
磁界、２つ・・・受磁部。
出願人代理人 佐 藤 −雄
１１１ｎＪ
高２図
涜３ 図
消５図
泊６図
６７図
処８図
佑９図
′３２
躬１０図FIG. 1 is a side view showing an embodiment of the electromagnetic ultrasonic transducer according to the present invention, FIG. 2 is a view taken along the line ■-■ in FIG.
Figure 3 is a diagram showing the arrangement relationship between the transmitting conductor and the receiving conductor, Figure 4 is a diagram showing the operation when transmitting ultrasonic waves, and Figure 5 is a diagram showing the operation when receiving ultrasonic waves. Figure 6 is a diagram showing that the receiving conductor is not affected by the high frequency current manually applied to the transmitting conductor, Figure 7 is a side view of a conventional electromagnetic ultrasonic transducer, and Figure 8 is a diagram showing that the receiving conductor is not affected by the high frequency current manually applied to the transmitting conductor. Figure 7 is a view taken along the ■-■ line in Figure 7, Figure 9 is a diagram showing the operation when transmitting ultrasonic waves, Figure 10 is a diagram showing the case of detecting defects near the weld, and Figure 11 is a diagram showing the operation when transmitting ultrasonic waves. FIG. 12 is a diagram showing the electrical waveforms at both ends of , and FIG. 12 is a diagram showing a state in which the reflected pulse is hidden by the transmitted pulse. DESCRIPTION OF SYMBOLS 1... Electromagnetic ultrasonic transducer, 2... Electric insulator, 3... Transmission conductor, 4... Permanent magnet, 5...
... Electrical insulator, 6 ... Conductor for reception, ] 2 ... High frequency current, 14 ... Induced eddy current, 15 ... Bias magnetic field, 16 ... Lorentz force, 17 ... For transmission Ultrasonic wave, 20... Material to be inspected, 22... Ultrasonic wave for reception, 23
... Vibration, 24... Induced eddy current, 25... High frequency magnetic field, 2... Magnetic receiving part. Applicant's agent Sato - Yu 111nJ High school 2nd figure, 3rd figure, 5th figure, 6th figure, 67th figure, 8th figure, Yu9 figure'32, 10th figure
Claims (1)
ジグザグ状に屈曲形成された２種の導電体を設け、永久
磁石の着磁方向と直交する一側面に電気絶縁体を介して
一方の導電体を積層し、この一方の導電体に電気絶縁体
を介して他方の導電体をその分岐導電体が前記一方の分
岐導電体の間隔部分に整合するよう積層し、さらに前記
２種の導電体を送信用導電体および受信用導電体に分け
たことを特徴とする電磁超音波トランスジューサ。Two types of conductors are provided with conductive strips bent in a zigzag pattern so that the U-shaped portions are alternately continuous. the other conductor is laminated on one conductor through an electrical insulator such that the branch conductor matches the interval between the one branch conductor, and the two types of conductor An electromagnetic ultrasonic transducer characterized in that the transducer is divided into a transmitting conductor and a receiving conductor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62138655A JP2538596B2 (en) | 1987-06-02 | 1987-06-02 | Electromagnetic ultrasonic transducer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62138655A JP2538596B2 (en) | 1987-06-02 | 1987-06-02 | Electromagnetic ultrasonic transducer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63302360A true JPS63302360A (en) | 1988-12-09 |
| JP2538596B2 JP2538596B2 (en) | 1996-09-25 |
Family
ID=15227052
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62138655A Expired - Fee Related JP2538596B2 (en) | 1987-06-02 | 1987-06-02 | Electromagnetic ultrasonic transducer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2538596B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0384455A (en) * | 1989-08-29 | 1991-04-10 | Toshiba Corp | Electromagnetic ultrasonic transducer |
| JP2011220972A (en) * | 2010-04-14 | 2011-11-04 | Kyushu Electric Power Co Inc | Electromagnetic ultrasonic sensor |
-
1987
- 1987-06-02 JP JP62138655A patent/JP2538596B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0384455A (en) * | 1989-08-29 | 1991-04-10 | Toshiba Corp | Electromagnetic ultrasonic transducer |
| JP2011220972A (en) * | 2010-04-14 | 2011-11-04 | Kyushu Electric Power Co Inc | Electromagnetic ultrasonic sensor |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2538596B2 (en) | 1996-09-25 |
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