JPH05340933A - Ultrasonic probe for inside of pipe - Google Patents

Ultrasonic probe for inside of pipe

Info

Publication number
JPH05340933A
JPH05340933A JP17178092A JP17178092A JPH05340933A JP H05340933 A JPH05340933 A JP H05340933A JP 17178092 A JP17178092 A JP 17178092A JP 17178092 A JP17178092 A JP 17178092A JP H05340933 A JPH05340933 A JP H05340933A
Authority
JP
Japan
Prior art keywords
ultrasonic
reflected
pipe
ultrasonic waves
case
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.)
Pending
Application number
JP17178092A
Other languages
Japanese (ja)
Inventor
Fumito Iwasaki
史十 岩▲崎▼
Yoshihiko Takishita
芳彦 瀧下
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Construction Machinery Co Ltd
Original Assignee
Hitachi Construction Machinery Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hitachi Construction Machinery Co Ltd filed Critical Hitachi Construction Machinery Co Ltd
Priority to JP17178092A priority Critical patent/JPH05340933A/en
Publication of JPH05340933A publication Critical patent/JPH05340933A/en
Pending legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00Indexing codes associated with group G01N29/00
    • G01N2291/04Wave modes and trajectories
    • G01N2291/044Internal reflections (echoes), e.g. on walls or defects

Landscapes

  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)

Abstract

PURPOSE:To obtain an ultrasonic probe which can accurately detect the defect of the surface within a pipe by eliminating ultrasonic wave which is harmful to detection of the defect on the surface within the pipe. CONSTITUTION:This probe has an array vibrator 5 for transmitting and receiving ultrasonic wave which is laid out on one surface 4a of a case 4 and detects the defect of an inner surface 2a of a pipe 2 by transmitting and receiving an ultrasonic wave from the vibrator 5 and one part of the outer surface of the case 4 is a harmful reflection surface (rear surface) 4b which reflects the ultrasonic wave which is transmitted from the vibrator 5 toward a flaw detection part A of the inner surface 2a, is reflected by the flaw detection part A, and then is reflected by the inner surface 2. Then, the rear surface 4b is inclined so that ultrasonic wave is reflected at an angle for an incidence wave on the surface. The ultrasonic wave which enters the rear surface 4b is reflected on the surface 4b with an angle for the incidence wave and does not return to the vibrator 5.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、超音波探傷装置に接続
され、超音波を送受信して管の内面の欠陥を探傷する管
内用超音波探触子に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultrasonic probe for pipes which is connected to an ultrasonic flaw detector and transmits and receives ultrasonic waves to detect defects on the inner surface of the pipe.

【0002】[0002]

【従来の技術】従来、このような管内用超音波探触子と
しては、例えば、図6及び図7に示すようなものが知ら
れている。同図に示す管内用超音波探触子100は、略
四角柱形状のケース104を有しており、このケース1
04の一面104aには不図示の超音波探傷装置に接続
されて超音波を送受信するセンサ部105が配置されて
いる。
2. Description of the Related Art Conventionally, as such an ultrasonic probe for a tube, for example, those shown in FIGS. 6 and 7 are known. The ultrasonic probe 100 for pipes shown in the figure has a case 104 having a substantially rectangular prism shape.
On one surface 104a of 04, a sensor unit 105 that is connected to an ultrasonic flaw detector (not shown) and transmits / receives ultrasonic waves is arranged.

【0003】一般に、表面の欠陥を探傷する場合、超音
波を探傷面に対してある角度で入射させることによっ
て、表面の凹凸を避けて欠陥だけを探傷する手法があ
る。この手法により前記超音波探触子100を用いて管
2の内面2aの欠陥を探傷する場合、図6及び図7に示
すように、センサ部105から管2の内面2aの探傷部
Aに向けて送信された超音波は、探傷部Aで反射した
後、さらに内面2aのB、C及びD部で反射してケース
104の背面104bに達し、この背面104bで反射
して同じ径路を逆に通ってセンサ部105に戻る。
In general, in the case of flaw detection on a surface, there is a method in which ultrasonic waves are incident on the flaw detection surface at an angle to avoid flaws on the surface and detect only the flaw. When the ultrasonic probe 100 is used to detect a defect on the inner surface 2a of the tube 2 by this method, as shown in FIGS. 6 and 7, from the sensor section 105 to the flaw detection section A of the inner surface 2a of the tube 2. The ultrasonic wave transmitted as described above is reflected by the flaw detection portion A, is further reflected by the B, C, and D portions of the inner surface 2a and reaches the back surface 104b of the case 104, and is reflected by the back surface 104b to reverse the same path. It returns to the sensor part 105 through.

【0004】このようにセンサ部105から送信された
超音波がケース104の背面104bで反射されてセン
サ部105に戻るのは、センサ部105が配置されてい
るケース104の一面104aと背面104bとが略平
行な面であるため、この背面104bで超音波が垂直に
反射するからである。
The ultrasonic waves transmitted from the sensor unit 105 are reflected by the rear surface 104b of the case 104 and returned to the sensor unit 105 in the one surface 104a and the rear surface 104b of the case 104 in which the sensor unit 105 is arranged. Are substantially parallel surfaces, so that the ultrasonic waves are reflected vertically on the back surface 104b.

【0005】このようにセンサ部105から送信された
超音波が背面104bで反射されてセンサ部105に戻
ってくる現象は、センサ部105による送受信が1回だ
けの場合、あるいはセンサ部105による1回目の送受
信から2回目以降の送受信までに十分な時間がある場合
には、背面104bで反射されてセンサ部105に戻っ
てくる超音波は、探傷部Aに欠陥があってここから乱反
射してセンサ部105に戻る超音波に比べて時間的に遅
く受信されるため特に問題にはならなかった。
The phenomenon in which the ultrasonic wave transmitted from the sensor unit 105 is reflected on the back surface 104b and returns to the sensor unit 105 in this manner when the sensor unit 105 transmits and receives only once, or when the sensor unit 105 transmits and receives the ultrasonic wave. When there is sufficient time from the second transmission / reception to the second and subsequent transmissions / receptions, the ultrasonic waves reflected by the back surface 104b and returning to the sensor unit 105 have a defect in the flaw detection portion A and are diffusely reflected from here. There is no particular problem because the ultrasonic waves returned to the sensor unit 105 are received later in time.

【0006】[0006]

【発明が解決しようとする課題】ところが、1回目の送
受信から2回目以降の送受信までの時間が短い場合に
は、2回目以降の超音波がセンサ部105で受信される
ときに、この超音波が、背面104bで反射されてセン
サ部105に戻ってくる1回目の超音波と重なって受信
されてしまい、これによって2回目以降の超音波により
探傷されるべき本来の欠陥情報が乱されてしまい、管内
面の欠陥を正確に探傷できなくなってしまうことがある
という問題があった。
However, when the time from the first transmission / reception to the second and subsequent transmission / reception is short, when the second and subsequent ultrasonic waves are received by the sensor section 105, However, the first ultrasonic wave reflected by the back surface 104b and returned to the sensor unit 105 is received, and the original defect information to be detected by the second and subsequent ultrasonic waves is disturbed. However, there is a problem that it may not be possible to accurately detect defects on the inner surface of the pipe.

【0007】特に、超音波探触子100のセンサ部10
5として、超音波探傷装置内の超音波スキャン装置で駆
動されるアレイ振動子を用い、このアレイ振動子の各振
動子による超音波の送受信が高速で順番に行なわれるこ
とにより、超音波による管内面の走査が電気的に高速で
行なわれる場合には、上記問題が生じる可能性が非常に
高い。
In particular, the sensor portion 10 of the ultrasonic probe 100
As the element 5, an array transducer driven by an ultrasonic scanning device in the ultrasonic flaw detector is used, and ultrasonic waves are transmitted and received by each transducer of the array transducer at high speed in sequence, thereby the inside of the ultrasonic tube The above problems are very likely to occur when the surface is scanned electrically at high speed.

【0008】本発明は、このような従来の問題点に着目
して為されたもので、管内面の欠陥を探傷するのに有害
となる超音波を排除することができ、管内面の欠陥を正
確に探傷することができる管内用超音波探触子を提供す
ることを目的としている。
The present invention has been made by paying attention to such a conventional problem, and it is possible to eliminate ultrasonic waves which are harmful for flaw detection on the inner surface of the pipe, and to eliminate the inner surface of the pipe. It is an object of the present invention to provide an ultrasonic probe for pipes that can detect flaws accurately.

【0009】[0009]

【課題を解決するための手段】上記目的を達成するため
に、本発明は、超音波探傷装置に接続され、超音波を送
受信するセンサ部がケースの外面に配置され、このセン
サ部から超音波を送受信して管の内面の欠陥を探傷する
もので、前記ケース外面の一部が、前記管内面の探傷部
に向けてセンサ部から送信されてこの探傷部での反射後
さらに管内面で反射してくる超音波をセンサ部に向けて
反射する有害反射面となっている管内用超音波探触子に
おいて、前記有害反射面を、この面で超音波が入射波に
対して角度をもって反射するように傾斜させてあるもの
である(請求項1)。
In order to achieve the above object, the present invention is directed to an ultrasonic flaw detector, and a sensor section for transmitting and receiving ultrasonic waves is arranged on the outer surface of a case, and the ultrasonic wave is emitted from the sensor section. To detect flaws on the inner surface of the pipe, and a part of the outer surface of the case is transmitted from the sensor unit toward the flaw detection portion on the inner surface of the pipe, and then reflected on the flaw detection portion. In an ultrasonic probe for a pipe, which is a harmful reflection surface that reflects incoming ultrasonic waves toward the sensor section, the harmful reflection surface reflects ultrasonic waves at an angle with respect to the incident wave. It is thus inclined (Claim 1).

【0010】また、上記目的を達成するために、本発明
は、超音波探傷装置に接続され、超音波を送受信するセ
ンサ部がケースの外面に配置され、このセンサ部から超
音波を送受信して管の内面の欠陥を探傷するもので、前
記ケース外面の一部が、前記管内面の探傷部に向けてセ
ンサ部から送信されてこの探傷部での反射後さらに管内
面で反射してくる超音波をセンサ部に向けて反射する有
害反射面となっている管内用超音波探触子において、前
記有害反射面に、超音波を吸収する反射防止膜を設けて
あるものである(請求項2)。
In order to achieve the above object, according to the present invention, a sensor unit which is connected to an ultrasonic flaw detector and which transmits and receives ultrasonic waves is arranged on an outer surface of a case, and transmits and receives ultrasonic waves from the sensor unit. It detects flaws on the inner surface of the pipe, and a part of the outer surface of the case is transmitted from the sensor unit toward the flaw detection portion of the inner surface of the pipe and after being reflected by the flaw detection portion, it is further reflected on the inner surface of the pipe. In the ultrasonic probe for a tube, which is a harmful reflection surface that reflects sound waves toward the sensor unit, an antireflection film that absorbs ultrasonic waves is provided on the harmful reflection surface (claim 2). ).

【0011】好ましくは、前記ケースは略四角柱形状を
有しており、前記有害反射面は、前記センサ部が配置さ
れている一面の反対側にある背面である(請求項3)。
Preferably, the case has a substantially rectangular prism shape, and the harmful reflection surface is a back surface opposite to one surface on which the sensor unit is arranged (claim 3).

【0012】[0012]

【作用】上記請求項1の管内用超音波探触子では、管内
面の探傷部に向けてセンサ部から送信され、この探傷部
での反射後さらに管内面で反射してケース外面の有害反
射面に入射する超音波は、傾斜させてある有害反斜面で
入射波に対して角度をもって反射するので、センサ部に
戻らない。
According to the ultrasonic probe for a pipe of the above-mentioned claim 1, the sensor unit transmits the flaw toward the flaw detection portion on the inner surface of the pipe, and after the reflection at the flaw detection portion, the reflection on the inner surface of the pipe and the harmful reflection on the outer surface of the case. The ultrasonic waves incident on the surface do not return to the sensor unit because they are reflected at an angle with respect to the incident wave by the inclined harmful anti-slope surface.

【0013】また、上記請求項2の管内用超音波探触子
では、管内面の探傷部に向けてセンサ部から送信され、
この探傷部での反射後さらに管内面で反射してケース外
面の有害反射面に設けてある反射防止膜に入射する超音
波は、この反射防止膜で吸収されるので、センサ部に戻
らない。
Further, in the ultrasonic probe for inside a tube according to the above-mentioned claim 2, the signal is transmitted from the sensor section toward the flaw detection section on the inner surface of the tube,
The ultrasonic waves reflected by the flaw detection portion and further reflected on the inner surface of the tube and incident on the antireflection film provided on the harmful reflection surface on the outer surface of the case are absorbed by the antireflection film and therefore do not return to the sensor portion.

【0014】[0014]

【実施例】以下、図面に基づいて本発明の各実施例を説
明する。なお、各実施例の説明において同様の部位には
同一の符号を付して重複した説明を省略する。
Embodiments of the present invention will be described below with reference to the drawings. In the description of each embodiment, the same parts will be denoted by the same reference numerals and redundant description will be omitted.

【0015】図1乃至図3は本発明の第1実施例に係る
管内用超音波探触子を示しており、この管内用超音波探
触子1は、管2の内面2aに超音波を送受信してその内
面2aの欠陥を探傷するために、不図示の超音波探傷装
置にケーブル3を介して接続されて使用される。
FIGS. 1 to 3 show an ultrasonic probe for pipes according to a first embodiment of the present invention. The ultrasonic probe 1 for pipes transmits ultrasonic waves to an inner surface 2a of a pipe 2. In order to transmit and receive to detect flaws on the inner surface 2a thereof, it is used by being connected to an ultrasonic flaw detector (not shown) via a cable 3.

【0016】この管内用超音波探触子1は、図1乃至図
3に示すように、略四角柱形状のケース4を有してい
る。このケース4の一面4aには、超音波を送受信する
アレイ振動子(センサ部)5がケース4の長手方向に沿
って縦に配列されている。
As shown in FIGS. 1 to 3, the ultrasonic probe 1 for a tube has a case 4 having a substantially square pole shape. On one surface 4 a of the case 4, array transducers (sensor parts) 5 for transmitting and receiving ultrasonic waves are vertically arranged along the longitudinal direction of the case 4.

【0017】このアレイ振動子5の各振動子の電極部
(図示略)は、前記ケーブル3内に振動子と同数ある各
信号線を介して前記超音波探傷装置の電気回路部と電気
的に接続されており、アレイ振動子5が超音波探傷装置
の超音波スキャン装置(図示略)で駆動されてアレイ振
動子5の各振動子による超音波の送受信が順番に高速で
行なわれることにより、超音波による管2の内面2aの
走査が電気的に高速で行なわれるようになっている。図
1乃至図3では、アレイ振動子5の振動子5aにより超
音波の送受信が行なわれ、これによって前記内面2aの
A部分の欠陥を超音波により探傷している様子が示され
ている。
The electrode portion (not shown) of each transducer of the array transducer 5 is electrically connected to the electric circuit portion of the ultrasonic flaw detector through the same number of signal lines as the transducers in the cable 3. By being connected, the array transducer 5 is driven by an ultrasonic scanning device (not shown) of the ultrasonic flaw detector, and ultrasonic waves are sequentially transmitted and received by each transducer of the array transducer 5 at high speed. The scanning of the inner surface 2a of the tube 2 by ultrasonic waves is performed electrically at high speed. 1 to 3 show that ultrasonic waves are transmitted and received by the vibrator 5a of the array vibrator 5, whereby flaws in the portion A of the inner surface 2a are detected by ultrasonic waves.

【0018】ケース4の前記一面4aの反対側にある背
面4bを、この背面4bで超音波が入射波に対して角度
をもって反射するように傾斜させてある。すなわち、背
面4bは、前記一面4aと平行ではなく、この一面4a
に対して傾斜している。この背面4bは、もしこの面4
bが図6及び図7に示す上記従来技術のように前記一面
4aと略平行である場合に、管2の内面2aの探傷部例
えば探傷部Aに向けてアレイ振動子5から送信されてこ
の探傷部Aでの反射後さらに内面2aで反射してくる超
音波をアレイ振動子5に向けて反射してしまう有害反射
面となる。
A back surface 4b of the case 4 opposite to the one surface 4a is inclined so that ultrasonic waves are reflected by the back surface 4b at an angle with respect to an incident wave. That is, the back surface 4b is not parallel to the one surface 4a,
Inclined to. This back surface 4b is, if this surface 4
When b is substantially parallel to the one surface 4a as in the prior art shown in FIGS. 6 and 7, it is transmitted from the array transducer 5 to the flaw detection portion of the inner surface 2a of the tube 2, for example, the flaw detection portion A, The ultrasonic wave reflected by the inner surface 2a after being reflected by the flaw detection portion A is a harmful reflection surface that is reflected toward the array transducer 5.

【0019】そこで、この第1実施例では、前記有害反
射面となるケース4の背面4bを、この面4bで超音波
が入射波に対して角度をもって反射するように傾斜させ
てある。
Therefore, in the first embodiment, the back surface 4b of the case 4, which is the harmful reflection surface, is inclined so that the ultrasonic wave is reflected at an angle with respect to the incident wave on the surface 4b.

【0020】なお、この第1実施例では、管内用超音波
探触子1は略四角柱形状のケース4を有するものである
が、本発明はこれに限定されるものではなく、他の形
状、例えば多角形状のケースを有する管内用超音波探触
子にも適用される。この場合にも、多角形状のケースの
外面のうち、前記有害反射面となる面を上記第1実施例
と同様に傾斜させればよい。
In the first embodiment, the ultrasonic probe for tube 1 has the case 4 having a substantially rectangular prism shape, but the present invention is not limited to this and other shapes are used. Also, it is applied to an ultrasonic probe for a tube having a polygonal case, for example. In this case as well, of the outer surfaces of the polygonal case, the surface serving as the harmful reflection surface may be inclined as in the first embodiment.

【0021】次に、上記構成を有する第1実施例の作用
を説明する。
Next, the operation of the first embodiment having the above construction will be described.

【0022】図1乃至図3に示すように、アレイ振動子
5の1つの振動子5aから管2の内面2aの探傷部Aに
向けて送信された超音波は、探傷部Aで反射した後、さ
らに内面2aのB、C及びD部で反射してケース4の背
面4bのE部に入射する。このE部に入射した超音波
は、傾斜させてある背面4bで前記D部からの入射波
(超音波)に対して角度をもって反射して前記D部の垂
直下方にあるD´部に向かい、このD´部で反射した
後、さらに前記C部の垂直下方にあるC ´部 で反射
し、この反射波Xは管2の下端開口部2bから外部に出
る。
As shown in FIGS. 1 to 3, the ultrasonic waves transmitted from one transducer 5a of the array transducer 5 to the flaw detection portion A on the inner surface 2a of the tube 2 are reflected by the flaw detection portion A and then reflected. Further, the light is reflected by the B, C and D portions of the inner surface 2a and enters the E portion of the back surface 4b of the case 4. The ultrasonic wave incident on the E section is reflected by the inclined back surface 4b at an angle with respect to the incident wave (ultrasonic wave) from the D section, and travels to the D'section vertically below the D section, After being reflected by the D'section, it is further reflected by the C'section vertically below the C section, and the reflected wave X goes out from the lower end opening 2b of the tube 2.

【0023】すなわち、ケース4の背面4bに入射する
超音波は、傾斜させてある背面4bで入射波に対して角
度をもって反射するので、この超音波を送信した前記振
動子5aに戻らない。従って、管2の内面2aの探傷に
有害となる超音波を排除することができ、内面2aの欠
陥を正確に探傷することができる。
That is, since the ultrasonic wave incident on the back surface 4b of the case 4 is reflected by the inclined back surface 4b at an angle with respect to the incident wave, the ultrasonic wave does not return to the transducer 5a which transmitted the ultrasonic wave. Therefore, ultrasonic waves that are harmful to flaw detection on the inner surface 2a of the tube 2 can be eliminated, and flaws on the inner surface 2a can be accurately detected.

【0024】特に、アレイ振動子5が超音波探傷装置の
超音波スキャン装置で駆動されてアレイ振動子5の各振
動子による超音波の送受信が順番に高速で行なわれるこ
とにより、超音波による管2の内面2aの走査が電気的
に高速で行なわれる場合でも、アレイ振動子5の1つの
振動子例えば振動子5aで超音波が送受信されてから前
記背面4bで反射した超音波が、それ以降に送信される
超音波と重なって受信されることがなく、管2の内面2
aの欠陥を正確に探傷することができる。
In particular, the array transducer 5 is driven by the ultrasonic scanning device of the ultrasonic flaw detector, and ultrasonic waves are sequentially transmitted and received by the respective transducers of the array transducer 5 at high speed. Even if the scanning of the inner surface 2a of 2 is performed electrically at high speed, the ultrasonic wave reflected by the back surface 4b after the ultrasonic wave is transmitted / received by one vibrator of the array vibrator 5, for example, the vibrator 5a, The ultrasonic waves transmitted to the inner surface 2 of the tube 2 are not received and overlapped with each other.
The defect of a can be detected accurately.

【0025】次に、図4及び図5に基づいて本発明の第
2実施例を説明する。
Next, a second embodiment of the present invention will be described with reference to FIGS.

【0026】この第2実施例に係る超音波探触子1で
は、前記ケース4の一面4aの反対側にある背面(有害
反射面)4b´はケース4の前記一面4aと平行になっ
ており、且つこの背面4b´に、超音波を吸収する反射
防止膜10が固定して設けられている。
In the ultrasonic probe 1 according to the second embodiment, the back surface (harmful reflection surface) 4b 'opposite to the one surface 4a of the case 4 is parallel to the one surface 4a of the case 4. An antireflection film 10 that absorbs ultrasonic waves is fixedly provided on the back surface 4b '.

【0027】前記反射防止膜10は、発泡ゴムやコルク
等の、超音波を吸収して反射しない材質でできている。
The antireflection film 10 is made of a material such as foamed rubber or cork that absorbs ultrasonic waves and does not reflect them.

【0028】上記構成を有する第2実施例に係る超音波
探触子1では、図4及び図5に示すように、アレイ振動
子5の1つの振動子5aから管2の内面2aの探傷部A
に向けて送信された超音波は、探傷部Aで反射した後、
さらに内面2aのB、C及びD部で反射してケース4の
背面4bに設けてある反射防止膜10に入射する。この
入射した超音波は、反射防止膜10で吸収されるので、
反射されず、この超音波を送信した前記振動子5aに戻
らない。
In the ultrasonic probe 1 according to the second embodiment having the above-described structure, as shown in FIGS. 4 and 5, one transducer 5a of the array transducer 5 to the flaw detection portion of the inner surface 2a of the tube 2 is detected. A
After being reflected by the flaw detection part A, the ultrasonic wave transmitted toward
Further, the light is reflected by the B, C and D portions of the inner surface 2a and enters the antireflection film 10 provided on the back surface 4b of the case 4. Since the incident ultrasonic wave is absorbed by the antireflection film 10,
It is not reflected and does not return to the vibrator 5a that transmitted this ultrasonic wave.

【0029】従って、この第2実施例によっても、管2
の内面2aの探傷に有害となる超音波を排除することが
でき、内面2aの欠陥を正確に探傷することができる。
Therefore, according to this second embodiment as well, the pipe 2
The ultrasonic waves that are harmful to flaw detection on the inner surface 2a can be eliminated, and flaws on the inner surface 2a can be accurately detected.

【0030】[0030]

【発明の効果】以上詳述したように、本発明(請求項
1)によれば、超音波探傷装置に接続され、超音波を送
受信するセンサ部がケースの外面に配置され、このセン
サ部から超音波を送受信して管の内面の欠陥を探傷する
もので、前記ケース外面の一部が、前記管内面の探傷部
に向けてセンサ部から送信されてこの探傷部での反射後
さらに管内面で反射してくる超音波をセンサ部に向けて
反射する有害反射面となっている管内用超音波探触子に
おいて、前記有害反射面を、この面で超音波が入射波に
対して角度をもって反射するように傾斜させてある構成
により、管内面の探傷部に向けてセンサ部から送信さ
れ、この探傷部での反射後さらに管内面で反射してケー
ス外面の有害反射面に入射する超音波は、傾斜させてあ
る有害反斜面で入射波に対して角度をもって反射するの
で、センサ部に戻らない。従って、管内面の探傷に有害
となる超音波を排除することができ、管内面の欠陥を正
確に探傷することができる。
As described in detail above, according to the present invention (Claim 1), the sensor unit for transmitting and receiving ultrasonic waves, which is connected to the ultrasonic flaw detector, is arranged on the outer surface of the case. The ultrasonic wave is transmitted and received to detect flaws on the inner surface of the pipe. A part of the outer surface of the case is transmitted from the sensor unit to the flaw detection portion on the inner surface of the pipe, and after reflection at the flaw detection portion, the inner surface of the pipe is further reflected. In the ultrasonic probe for a pipe, which is a harmful reflection surface that reflects the ultrasonic waves reflected by the sensor unit, the harmful reflection surface is used as the ultrasonic wave at an angle with respect to the incident wave. Due to the structure that is inclined to reflect, ultrasonic waves transmitted from the sensor section toward the flaw detection section on the inner surface of the pipe, reflected by this flaw detection section, further reflected on the inner surface of the tube and incident on the harmful reflection surface on the outer surface of the case Is the incident wave on the inclined adverse anti-slope Since the reflection at an angle against, it does not return to the sensor unit. Therefore, ultrasonic waves that are harmful to flaw detection on the inner surface of the pipe can be eliminated, and flaws on the inner surface of the pipe can be accurately detected.

【0031】また、本発明(請求項2)によれば、超音
波探傷装置に接続され、超音波を送受信するセンサ部が
ケースの外面に配置され、このセンサ部から超音波を送
受信して管の内面の欠陥を探傷するもので、前記ケース
外面の一部が、前記管内面の探傷部に向けてセンサ部か
ら送信されてこの探傷部での反射後さらに管内面で反射
してくる超音波をセンサ部に向けて反射する有害反射面
となっている管内用超音波探触子において、前記有害反
射面に、超音波を吸収する反射防止膜を設けてある構成
により、管内面の探傷部に向けてセンサ部から送信さ
れ、この探傷部での反射後さらに管内面で反射してケー
ス外面の有害反射面に設けてある反射防止膜に入射する
超音波は、この反射防止膜で吸収されるので、センサ部
に戻らない。従って、管内面の探傷に有害となる超音波
を排除することができ、管内面の欠陥を正確に探傷する
ことができる。
According to the present invention (Claim 2), a sensor unit for transmitting and receiving ultrasonic waves, which is connected to the ultrasonic flaw detector, is arranged on the outer surface of the case, and ultrasonic waves are transmitted and received from the sensor unit to the pipe. Ultrasonic waves that are transmitted from the sensor portion toward the flaw detection portion on the inner surface of the pipe and are reflected on the inner surface of the pipe. In the ultrasonic probe for a pipe which is a harmful reflection surface that reflects toward the sensor unit, the harmful reflection surface is provided with an antireflection film that absorbs ultrasonic waves. Ultrasonic waves that are transmitted from the sensor section toward the target, are reflected by the flaw detection section, are further reflected by the inner surface of the tube, and enter the antireflection film provided on the harmful reflection surface on the outer surface of the case are absorbed by this antireflection film. It does not return to the sensor part. Therefore, ultrasonic waves that are harmful to flaw detection on the inner surface of the pipe can be eliminated, and flaws on the inner surface of the pipe can be accurately detected.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の第1実施例に係る超音波探触子を示
し、この探触子により管内面の欠陥を探傷している様子
を示す斜視図である。
FIG. 1 is a perspective view showing an ultrasonic probe according to a first embodiment of the present invention and showing a state in which defects on the inner surface of a pipe are detected by the probe.

【図2】図1のII矢視図である。FIG. 2 is a view on arrow II of FIG.

【図3】図2のIIIーIII線に沿う断面図である。FIG. 3 is a sectional view taken along the line III-III in FIG.

【図4】本発明の第2実施例に係る超音波探触子を示
し、この探触子により管内面の欠陥を探傷している様子
を示す平面図である。
FIG. 4 is a plan view showing an ultrasonic probe according to a second embodiment of the present invention and showing how defects on the inner surface of the tube are detected by the probe.

【図5】図4のVーV線に沿う断面図である。5 is a cross-sectional view taken along the line VV of FIG.

【図6】従来の超音波探触子を示し、この探触子により
管内面の欠陥を探傷している様子を示す平面図である。
FIG. 6 is a plan view showing a conventional ultrasonic probe, showing how a defect on the inner surface of the tube is detected by the probe.

【図7】図6のVIーVI線に沿う断面図である。7 is a sectional view taken along line VI-VI in FIG.

【符号の説明】[Explanation of symbols]

1 管内用超音波探触子 2 管 2a 内面 4 ケース 4b 背面(有害反射面) 5 アレイ振動子(センサ部) 10 反射防止膜 1 Ultrasonic probe for tube 2 Tube 2a Inner surface 4 Case 4b Rear surface (harmful reflection surface) 5 Array transducer (sensor part) 10 Antireflection film

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】 超音波探傷装置に接続され、超音波を送
受信するセンサ部がケースの外面に配置され、このセン
サ部から超音波を送受信して管の内面の欠陥を探傷する
もので、前記ケース外面の一部が、前記管内面の探傷部
に向けてセンサ部から送信されてこの探傷部での反射後
さらに管内面で反射してくる超音波をセンサ部に向けて
反射する有害反射面となっている管内用超音波探触子に
おいて、前記有害反射面を、この面で超音波が入射波に
対して角度をもって反射するように傾斜させてあること
を特徴とする管内用超音波探触子。
1. A sensor unit, which is connected to an ultrasonic flaw detector and transmits and receives ultrasonic waves, is arranged on an outer surface of a case, and transmits and receives ultrasonic waves from the sensor unit to detect defects on the inner surface of a pipe. A part of the outer surface of the case is a harmful reflection surface that reflects toward the sensor section ultrasonic waves transmitted from the sensor section toward the flaw detection section on the inner surface of the pipe and after being reflected by the flaw detection section and further reflected on the inner surface of the tube. In the ultrasonic probe for a pipe, the harmful reflection surface is inclined so that the ultrasonic wave is reflected at an angle with respect to the incident wave on the surface. Tentacles.
【請求項2】 超音波探傷装置に接続され、超音波を送
受信するセンサ部がケースの外面に配置され、このセン
サ部から超音波を送受信して管の内面の欠陥を探傷する
もので、前記ケース外面の一部が、前記管内面の探傷部
に向けてセンサ部から送信されてこの探傷部での反射後
さらに管内面で反射してくる超音波をセンサ部に向けて
反射する有害反射面となっている管内用超音波探触子に
おいて、前記有害反射面に、超音波を吸収する反射防止
膜を設けてあることを特徴とする管内用超音波探触子。
2. A sensor unit, which is connected to an ultrasonic flaw detector and transmits and receives ultrasonic waves, is arranged on the outer surface of the case, and ultrasonic waves are transmitted and received from the sensor unit to detect defects on the inner surface of the pipe. A part of the outer surface of the case is a harmful reflection surface that reflects toward the sensor section ultrasonic waves transmitted from the sensor section toward the flaw detection section on the inner surface of the pipe and after being reflected by the flaw detection section and further reflected on the inner surface of the tube. The ultrasonic probe for a tube as described above, wherein the harmful reflection surface is provided with an antireflection film for absorbing an ultrasonic wave.
【請求項3】 前記ケースは略四角柱形状を有してお
り、前記有害反射面は、前記センサ部が配置されている
一面の反対側にある背面であることを特徴とする請求項
1又は2記載の探触子。
3. The case has a quadrangular prism shape, and the harmful reflection surface is a back surface opposite to one surface on which the sensor unit is arranged. The probe described in 2.
JP17178092A 1992-06-05 1992-06-05 Ultrasonic probe for inside of pipe Pending JPH05340933A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17178092A JPH05340933A (en) 1992-06-05 1992-06-05 Ultrasonic probe for inside of pipe

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17178092A JPH05340933A (en) 1992-06-05 1992-06-05 Ultrasonic probe for inside of pipe

Publications (1)

Publication Number Publication Date
JPH05340933A true JPH05340933A (en) 1993-12-24

Family

ID=15929548

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17178092A Pending JPH05340933A (en) 1992-06-05 1992-06-05 Ultrasonic probe for inside of pipe

Country Status (1)

Country Link
JP (1) JPH05340933A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110632177A (en) * 2019-10-24 2019-12-31 大连理工大学 Electromagnetic ultrasonic detection method for plane residual stress

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110632177A (en) * 2019-10-24 2019-12-31 大连理工大学 Electromagnetic ultrasonic detection method for plane residual stress

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