JPH08292176A - Ultrasonic probe - Google Patents
Ultrasonic probeInfo
- Publication number
- JPH08292176A JPH08292176A JP7096406A JP9640695A JPH08292176A JP H08292176 A JPH08292176 A JP H08292176A JP 7096406 A JP7096406 A JP 7096406A JP 9640695 A JP9640695 A JP 9640695A JP H08292176 A JPH08292176 A JP H08292176A
- Authority
- JP
- Japan
- Prior art keywords
- ultrasonic
- probe
- inspected
- ultrasonic waves
- notch
- 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
Links
- 239000000523 sample Substances 0.000 title claims abstract description 48
- 239000000463 material Substances 0.000 claims abstract description 30
- 238000007689 inspection Methods 0.000 claims abstract description 14
- 239000002184 metal Substances 0.000 claims description 3
- 239000011347 resin Substances 0.000 claims description 3
- 229920005989 resin Polymers 0.000 claims description 3
- 238000001514 detection method Methods 0.000 abstract description 6
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000009792 diffusion process Methods 0.000 description 4
- 230000001902 propagating effect Effects 0.000 description 4
- 239000004925 Acrylic resin Substances 0.000 description 2
- 229920000178 Acrylic resin Polymers 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000000644 propagated effect Effects 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- -1 for example Polymers 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/04—Wave modes and trajectories
- G01N2291/044—Internal reflections (echoes), e.g. on walls or defects
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/26—Scanned objects
- G01N2291/269—Various geometry objects
- G01N2291/2695—Bottles, containers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Landscapes
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
- Monitoring And Testing Of Nuclear Reactors (AREA)
Abstract
(57)【要約】
【目的】 超音波探傷子から比較的深い（例えば３００
〜４００ｍｍ）ところに位置するノズル内面のコーナ部
のノッチから、大きな反射エコーを受信することがで
き、これにより高いＳ／Ｎ比でノッチの探傷ができる超
音波探傷子を提供する。
【構成】 超音波を発射する振動子１２と、振動子を内
部に充填した探触子本体１４とからなる。探触子本体は
被検査材２の円弧状の凹面２ａに接触する接触面１２ａ
を有する。振動子１２は接触面側が膨らんだ凸面１２ａ
を有しかつこの凸面に直交する方向に超音波を発射する
ようになっている。また振動子の凸面は、被検査材の円
弧状の凹面で屈折する超音波がほぼ平行に被検査材内に
伝播する大きさの円弧面に形成されている。
(57) [Abstract] [Purpose] Relatively deep from ultrasonic flaw detectors (eg 300
It is possible to receive a large reflected echo from a notch in a corner portion of the inner surface of the nozzle located at a position of up to 400 mm), thereby providing an ultrasonic flaw detector capable of flaw detection of the notch with a high S / N ratio. [Structure] An oscillator 12 that emits ultrasonic waves and a probe main body 14 having the oscillator filled therein. The probe body has a contact surface 12a that contacts the arcuate concave surface 2a of the inspection object 2.
Have. The vibrator 12 has a convex surface 12a whose contact surface side is swollen.
And emits ultrasonic waves in a direction orthogonal to the convex surface. Further, the convex surface of the vibrator is formed in an arcuate surface having a size in which ultrasonic waves refracted by the arcuate concave surface of the material to be inspected propagate in parallel to the material to be inspected.
Description
【０００１】[0001]
【産業上の利用分野】本発明は、部材の欠陥を超音波で
調べる超音波探傷装置用の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 use in an ultrasonic flaw detector for inspecting a member for defects by ultrasonic waves.
【０００２】[0002]
【従来の技術】図４は、原子力圧力容器の部分断面斜視
図である。この図に示す入口及び出口のノズル内面のコ
ーナ部には、例えば長期間の使用により応力腐食割れの
ような微細な亀裂やノッチ（以下、単にノッチという）
が発生することがある。このため、ノズル内面のコーナ
部のノッチを外部から調べるために、従来から超音波探
傷検査が行われている。2. Description of the Related Art FIG. 4 is a partial sectional perspective view of a nuclear pressure vessel. In the corners of the inlet and outlet nozzle inner surfaces shown in this figure, for example, minute cracks such as stress corrosion cracks or notches (hereinafter simply referred to as notches) due to long-term use.
May occur. Therefore, in order to examine the notch of the corner portion of the inner surface of the nozzle from the outside, ultrasonic flaw detection has been conventionally performed.
【０００３】図５は、ノズル内面のコーナ部の超音波探
傷検査方法を示す模式図である。この図に示すように、
ノズル内面のコーナ部のノッチを外部から調べるため
に、ノズル外面の円弧状の隅部に超音波探触子１を当
て、この超音波探触子から超音波を圧力容器の内部に向
けて発射し、ノッチから反射される超音波（反射エコ
ー）の波形から、ノッチの存在の有無やその大きさを判
断していた。FIG. 5 is a schematic view showing an ultrasonic flaw inspection method for a corner portion on the inner surface of a nozzle. As shown in this figure,
In order to investigate the notch of the corner of the inner surface of the nozzle from the outside, the ultrasonic probe 1 is applied to the arc-shaped corner of the outer surface of the nozzle, and ultrasonic waves are emitted from the ultrasonic probe toward the inside of the pressure vessel. Then, the presence or absence of the notch and its size are judged from the waveform of the ultrasonic wave (reflected echo) reflected from the notch.
【０００４】[0004]
【発明が解決しようとする課題】しかし、上述した従来
の超音波探傷では、平板部分や浅い部分のノッチは、反
射エコーの高さが十分大きく、高いＳ／Ｎ比（ノイズに
対する信号の割合）でノッチの探傷ができるが、ノズル
内面のコーナ部は、超音波探傷子１から３００〜４００
ｍｍの深さにあり、かつコーナ部のため超音波が広がっ
て拡散し、反射エコーの高さが大幅に低くなり、Ｓ／Ｎ
比が悪化してノッチの探傷精度が悪化する問題点があっ
た。However, in the above-described conventional ultrasonic flaw detection, the notch in the flat plate portion or the shallow portion has a sufficiently high reflected echo height and a high S / N ratio (ratio of signal to noise). The notch can be flaw-detected with the
Since it is located at a depth of mm and the corner portion spreads and diffuses ultrasonic waves, the height of the reflected echo is significantly reduced, resulting in S / N.
There is a problem that the ratio deteriorates and the accuracy of flaw detection of the notch deteriorates.
【０００５】本発明は、かかる問題点を解決するために
創案されたものである。すなわち、本発明の目的は、超
音波探傷子から比較的深い（例えば３００〜４００ｍ
ｍ）ところに位置するノズル内面のコーナ部のノッチか
ら、大きな反射エコーを受信することができ、これによ
り高いＳ／Ｎ比でノッチの探傷ができる超音波探傷子を
提供することにある。The present invention was devised to solve such problems. That is, the object of the present invention is to be relatively deep from the ultrasonic flaw detector (for example, 300 to 400 m).
It is an object of the present invention to provide an ultrasonic flaw detector capable of receiving a large reflected echo from a notch in a corner portion on the inner surface of the nozzle located at the position m), and thereby detecting a notch with a high S / N ratio.
【０００６】[0006]
【課題を解決するための手段】本発明によれば、超音波
を発射する振動子と、該振動子を内部に充填した探触子
本体と、からなり、探触子本体は被検査材の円弧状の凹
面に接触する接触面を有し、振動子は前記接触面側が膨
らんだ凸面を有しかつ該凸面に直交する方向に超音波を
発射するようになっている、ことを特徴とする超音波探
触子が提供される。According to the present invention, a transducer for emitting an ultrasonic wave and a probe main body having the transducer filled therein are provided. The vibrator has a contact surface that contacts an arcuate concave surface, and the vibrator has a convex surface on which the contact surface side is swollen and emits ultrasonic waves in a direction orthogonal to the convex surface. An ultrasonic probe is provided.
【０００７】本発明の好ましい実施例によれば、前記振
動子の凸面は、被検査材の円弧状の凹面で屈折する超音
波がほぼ平行に被検査材内に伝播する大きさの円弧面に
形成されている。また、前記探触子本体は樹脂製であ
り、被検査材は金属製である、ことが好ましい。According to a preferred embodiment of the present invention, the convex surface of the vibrator is an arc surface of a size that allows ultrasonic waves refracted by the arc concave surface of the material to be inspected to propagate substantially parallel to the material to be inspected. Has been formed. Further, it is preferable that the probe main body is made of resin and the material to be inspected is made of metal.
【０００８】[0008]
【作用】本願発明の発明者等は、従来の超音波探触子に
内蔵されている振動子が平板状であり、この振動子から
発振された超音波が、被検査材（ノズル）の円弧状の凹
面で屈折することにより、超音波探触子に比較的近い浅
い部分（例えば１００ｍｍ前後）に焦点を結んだのちに
拡散することを解析により確認した。このため、超音波
探傷子から比較的深い（例えば３００〜４００ｍｍ）と
ころに位置するノズル内面のコーナ部のノッチには、超
音波が大きく広がって拡散するため、この拡散された超
音波による反射エコーが弱くなってしまい、反射エコー
の高さが大幅に低くなり、Ｓ／Ｎ比が悪化することがわ
かった。本発明はかかる新規の知見に基づくものであ
る。According to the inventors of the present invention, the vibrator incorporated in the conventional ultrasonic probe has a flat plate shape, and the ultrasonic wave oscillated from the vibrator is a circle of the material to be inspected (nozzle). It was confirmed by analysis that the light was refracted by the arcuate concave surface and then diffused after being focused on a shallow portion (for example, around 100 mm) relatively close to the ultrasonic probe. For this reason, the ultrasonic waves largely spread and diffuse in the notch at the corner of the inner surface of the nozzle located relatively deep (for example, 300 to 400 mm) from the ultrasonic flaw detector. Was weakened, the height of the reflected echo was significantly decreased, and the S / N ratio was deteriorated. The present invention is based on this novel finding.
【０００９】すなわち、上述した本発明の構成によれ
ば、超音波探触子に内蔵された振動子が、被検査材に接
触する接触面側に膨らんだ凸面を有しており、この凸面
に直交する方向に超音波が発射されるので、被検査材
（ノズル）の円弧状の凹面で屈折した超音波の焦点位置
を、深く（好ましくは無限に）することができ、超音波
の広がり幅を狭くすることができる。従って、超音波探
傷子から比較的深い（例えば３００〜４００ｍｍ）とこ
ろに位置するノズル内面のコーナ部のノッチに、広がり
が小さい強い超音波を当てることができ、このノッチに
より反射された反射エコーも強くなり、反射エコーの高
さが大きくなり、Ｓ／Ｎ比を改善することができる。That is, according to the above-described structure of the present invention, the transducer incorporated in the ultrasonic probe has a convex surface that bulges toward the contact surface that contacts the material to be inspected. Since the ultrasonic waves are emitted in the orthogonal direction, the focal position of the ultrasonic waves refracted by the arcuate concave surface of the inspection object (nozzle) can be made deep (preferably infinite), and the ultrasonic spread width Can be narrowed. Therefore, a strong ultrasonic wave with a small spread can be applied to the notch of the corner portion of the nozzle inner surface located relatively deep (for example, 300 to 400 mm) from the ultrasonic flaw detector, and the reflection echo reflected by this notch also It becomes stronger, the height of the reflected echo becomes larger, and the S / N ratio can be improved.
【００１０】更に、振動子の凸面を、被検査材の円弧状
の凹面で屈折する超音波がほぼ平行に被検査材内に伝播
する大きさの円弧面に形成することにより、被検査材内
に伝播する超音波の広がりがほとんどなくなり、一層強
い超音波をノッチに当てることができ、反射エコーも更
に強くなり、Ｓ／Ｎ比を更に改善することができる。Further, by forming the convex surface of the vibrator into an arc surface of a size that allows ultrasonic waves refracted by the arc-shaped concave surface of the material to be inspected to propagate substantially parallel to the material to be inspected, The spread of the ultrasonic wave propagating to the surface is almost eliminated, a stronger ultrasonic wave can be applied to the notch, the reflected echo becomes stronger, and the S / N ratio can be further improved.
【００１１】[0011]
【実施例】以下、本発明の好ましい実施例を図面に基づ
いて説明する。なお、各図において共通の部材には同一
の符号を付して使用する。図１は、本発明による超音波
探触子の外形図であり、（Ａ）は正面図、（Ｂ）は側面
図、（Ｃ）は底面図である。本発明の超音波探触子１０
は、超音波を発射する振動子１２と、振動子１２を内部
に充填した探触子本体１４とからなる。探触子本体１４
は樹脂製であり、例えばアクリル樹脂からなる。また、
被検査材は通常金属製、例えば鋼材からなる。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the drawings. In the drawings, common members are designated by the same reference numerals and used. FIG. 1 is an external view of an ultrasonic probe according to the present invention, (A) is a front view, (B) is a side view, and (C) is a bottom view. Ultrasonic probe 10 of the present invention
Is composed of a vibrator 12 that emits ultrasonic waves and a probe body 14 having the vibrator 12 filled therein. Probe body 14
Is made of resin, for example, acrylic resin. Also,
The material to be inspected is usually made of metal, for example steel.
【００１２】本発明の探触子本体１４は、被検査材の円
弧状の凹面に接触する接触面１４ａを有する。この接触
面１４ａは図１に示すように少なくとも一方向が円弧状
になっており、被検査材の円弧状の凹面に密に接触でき
るようになっている。また、接触面１４ａには、凹溝１
４ｂが設けられており、この凹溝１４ｂに超音波を伝播
させる媒体となる液体、例えば水、をコネクタ１３を介
して供給することにより、超音波探傷検査時に探触子の
接触面１４ａと被検査面との間に媒体を存在させ、超音
波の被検査材への伝播が円滑になるようになっている。
なお、図１において、１５は超音波探触子を移動させる
アーム（図示せず）等への取付け部である。The probe main body 14 of the present invention has a contact surface 14a that contacts the arcuate concave surface of the material to be inspected. As shown in FIG. 1, this contact surface 14a is arcuate in at least one direction, and is capable of closely contacting the arcuate concave surface of the material to be inspected. In addition, the contact surface 14a has a groove 1
4b is provided, and a liquid serving as a medium for propagating ultrasonic waves, for example, water is supplied to the concave groove 14b through the connector 13 so that the contact surface 14a of the probe and the contact surface 14a of the probe are subjected to ultrasonic flaw inspection. A medium is present between the surface to be inspected and ultrasonic waves are smoothly propagated to the material to be inspected.
In FIG. 1, reference numeral 15 is a mounting portion for an arm (not shown) for moving the ultrasonic probe.
【００１３】図２は、本発明による超音波探触子による
超音波の伝播状態を示す図であり、図３は、従来の超音
波探触子による同様の図である。以下、図２と図３を対
比させて説明する。図２（Ａ）は、本発明による超音波
探触子１０と、被検査材２（例えばノズル）の円弧状の
凹面２ａとの接触部を示している。本発明の振動子１２
は探触子本体１４の接触面１４ａの側が膨らんだ凸面を
有しこの凸面に直交する方向に超音波３を発射するよう
になっている。これに対して図３（Ａ）は、従来の超音
波探触子４と、被検査材２の円弧状の凹面２ａとの接触
部を示しており、振動子５は平板状であり、振動子５の
軸線方向に超音波３を発射するようになっている。FIG. 2 is a diagram showing an ultrasonic wave propagating state by the ultrasonic probe according to the present invention, and FIG. 3 is a similar diagram by the conventional ultrasonic probe. Hereinafter, description will be made by comparing FIGS. 2 and 3. FIG. 2A shows a contact portion between the ultrasonic probe 10 according to the present invention and the arcuate concave surface 2a of the inspection object 2 (for example, the nozzle). Transducer 12 of the present invention
Has a bulged convex surface on the contact surface 14a side of the probe main body 14 and emits ultrasonic waves 3 in a direction orthogonal to the convex surface. On the other hand, FIG. 3 (A) shows a contact portion between the conventional ultrasonic probe 4 and the arcuate concave surface 2a of the material 2 to be inspected, and the vibrator 5 has a flat plate shape and vibrates. The ultrasonic wave 3 is emitted in the axial direction of the child 5.
【００１４】図２（Ａ）及び図３（Ａ）において、振動
子１２、５から発射された超音波３は、被検査材２の凹
面２ａで屈折して、被検査材２の内部に伝播される。こ
の屈折は、凹面２ａの垂線に対する超音波３の入射角を
α、屈折角をβとするとき、ｓｉｎ（α）／Ｃ1 ＝ｓｉ
ｎ（β）／Ｃ2 ．．．( 式１）の関係で示される。ここ
で、Ｃ1 、Ｃ2 は、各物質中の音波の伝播速度（音速）
であり、例えばアクリル樹脂中の縦波の音速Ｃ1 は、約
２７３０ｍ／ｓ、鋼材中の縦波，横波の音速Ｃ2 はそれ
ぞれ約５９００ｍ／ｓ、約３２３０ｍ／ｓである。2A and 3A, the ultrasonic wave 3 emitted from the vibrators 12 and 5 is refracted by the concave surface 2a of the inspection material 2 and propagates inside the inspection material 2. To be done. This refraction is sin (α) / C1 = si, where α is the incident angle of the ultrasonic wave 3 with respect to the perpendicular of the concave surface 2a and β is the refraction angle.
n (β) / C2. ． ． It is shown by the relationship of (Equation 1). Here, C1 and C2 are the propagation velocity (sound velocity) of the sound wave in each substance.
For example, the acoustic velocity C1 of the longitudinal wave in the acrylic resin is about 2730 m / s, and the acoustic velocity C2 of the longitudinal wave and the transverse wave in the steel material is about 5900 m / s and about 3230 m / s, respectively.
【００１５】図３に示す従来の超音波探触子４の場合、
振動子５の軸線方向に超音波３が発射されるので、例え
ば凹面２ａの円弧面の半径Ｒを９０ｍｍとするとき、被
検査材２（鋼材）に縦波が伝播する場合の屈折角βは式
１より約１７．５°となり、図３（Ｂ）に示すように、
超音波探触子４からから発振された超音波３が、超音波
探触子４に比較的近い浅い部分（縦波の場合約７５ｍｍ
前後）に焦点を結んだのちに拡散することになる。従っ
て、例えば凹面２ａから約２００、２５０、３５０ｍｍ
程度離れた部分での超音波の拡散幅をａ1,ａ2,ａ3 とす
ると、同一のノッチ幅Ｓの拡散幅に対する比率は、Ｓ／
ａ1 ＞Ｓ／ａ2 ＞Ｓ／ａ3 ．．．（式２）となる。In the case of the conventional ultrasonic probe 4 shown in FIG. 3,
Since the ultrasonic wave 3 is emitted in the axial direction of the vibrator 5, for example, when the radius R of the arc surface of the concave surface 2a is 90 mm, the refraction angle β when the longitudinal wave propagates to the inspected material 2 (steel material) is From Expression 1, it becomes about 17.5 °, and as shown in FIG.
The ultrasonic wave 3 oscillated from the ultrasonic probe 4 has a shallow portion relatively close to the ultrasonic probe 4 (about 75 mm in the case of a longitudinal wave).
Before and after) will be diffused after focusing on. Therefore, for example, about 200, 250, 350 mm from the concave surface 2a
When ultrasonic waves of spreading width extent distant parts and a 1, a 2, a 3 , the ratio of the diffusion width of the same notch width S, S /
a 1 > S / a 2 > S / a 3 . ． ． (Equation 2)
【００１６】この式２は、路程（超音波探傷子からの深
さ）が大きくなればなるほど、同一寸法のノッチからの
反射エコーの高さが低くなることを示している。従っ
て、従来の超音波探触子４の場合、超音波探傷子から比
較的深い（例えば３００〜４００ｍｍ）ところに位置す
るノズル内面のコーナ部のノッチには、超音波３が図３
（Ｂ）のように大きく広がって拡散するため、この拡散
された超音波による反射エコーも弱くなってしまい、反
射エコーの高さが大幅に低くなり、Ｓ／Ｎ比が悪化する
ことがわかる。This equation 2 indicates that the height of the reflected echo from the notch having the same size becomes lower as the path length (depth from the ultrasonic flaw detector) becomes larger. Therefore, in the case of the conventional ultrasonic probe 4, the ultrasonic wave 3 is generated in the notch of the corner portion of the inner surface of the nozzle located relatively deep (for example, 300 to 400 mm) from the ultrasonic probe.
It can be seen that, as shown in (B), the reflected echo due to the diffused ultrasonic waves is weakened because it spreads widely and is diffused, the height of the reflected echo is significantly lowered, and the S / N ratio is deteriorated.
【００１７】これに対して、図２に示す本発明の超音波
探触子１０の場合、振動子１２は探触子本体１４の接触
面１４ａの側が膨らんだ凸面を有しこの凸面に直交する
方向に超音波３を発射するので、図２（Ｂ）に示すよう
に、被検査材２（ノズル）の円弧状の凹面２ａで屈折し
た超音波３の焦点位置を、深く（好ましくは無限に）す
ることができ、超音波の広がり幅を狭くすることができ
る。On the other hand, in the case of the ultrasonic probe 10 of the present invention shown in FIG. 2, the transducer 12 has a convex surface on the side of the contact surface 14a of the probe body 14 that is bulged and is orthogonal to this convex surface. Since the ultrasonic wave 3 is emitted in the direction, as shown in FIG. 2B, the focal position of the ultrasonic wave 3 refracted by the arcuate concave surface 2a of the inspection object 2 (nozzle) is deep (preferably infinite). ) Can be performed, and the spread width of ultrasonic waves can be narrowed.
【００１８】この振動子１２の凸面は、被検査材２の円
弧状の凹面２ａで屈折する超音波がほぼ平行に被検査材
２の内部に伝播する大きさの円弧面に形成するのがよ
い。すなわち、式１から、例えば凹面２ａの円弧面の半
径Ｒを９０ｍｍとするとき、被検査材２（鋼材）に縦波
が伝播する場合の屈折角αを約３．７°とし、横波が伝
播する場合の屈折角αを約６．７°となるように振動子
１２の凸面を形成することにより、図２（Ｂ）に示すよ
うに、超音波探触子１０からから発振された超音波を、
ほぼ平行に被検査材２（鋼材）の内部に伝播させること
ができ、例えば凹面２ａから約２００、２５０、３５０
ｍｍ程度離れた部分での超音波の拡散幅が全てほぼ同一
のａとすることができ、ノッチ幅Ｓの拡散幅に対する比
率は、Ｓ／ａ．．．（式３）となる。すなわち、被検査
材内に伝播する超音波３の広がりがほとんどなくなり、
一層強い超音波３をノッチに当てることができ、反射エ
コーも更に強くなり、Ｓ／Ｎ比を更に改善することがで
きる。The convex surface of the vibrator 12 is preferably formed into an arc surface having a size that allows ultrasonic waves refracted by the arc-shaped concave surface 2a of the inspection object 2 to propagate substantially parallel to the inside of the inspection object 2. . That is, from Expression 1, for example, when the radius R of the arc surface of the concave surface 2a is 90 mm, the refraction angle α when the longitudinal wave propagates to the inspected material 2 (steel material) is about 3.7 °, and the transverse wave propagates. When the convex surface of the transducer 12 is formed so that the refraction angle α becomes about 6.7 ° in the case of, the ultrasonic wave oscillated from the ultrasonic probe 10 as shown in FIG. To
It can be propagated substantially parallel to the inside of the material to be inspected 2 (steel material), for example, from the concave surface 2a to about 200, 250, 350.
The diffusion widths of the ultrasonic waves at the portions separated by about mm can all be set to substantially the same a, and the ratio of the notch width S to the diffusion width is S / a. ． ． (Formula 3) That is, the spread of the ultrasonic wave 3 propagating in the inspection material is almost eliminated,
The stronger ultrasonic wave 3 can be applied to the notch, the reflected echo also becomes stronger, and the S / N ratio can be further improved.
【００１９】なお、本発明は上述した実施例に限定され
ず、本発明の要旨を逸脱しない範囲で種々に変更できる
ことは勿論である。The present invention is not limited to the above-described embodiments, and it goes without saying that various modifications can be made without departing from the gist of the present invention.
【００２０】[0020]
【発明の効果】上述したように、本発明の超音波探触子
は、超音波探傷子から比較的深い（例えば３００〜４０
０ｍｍ）ところに位置するノズル内面のコーナ部のノッ
チから、大きな反射エコーを受信することができ、これ
により高いＳ／Ｎ比でノッチの探傷ができる、等の優れ
た効果を有する。As described above, the ultrasonic probe of the present invention is relatively deep (for example, 300 to 40) from the ultrasonic probe.
A large reflected echo can be received from the notch at the corner of the inner surface of the nozzle located at 0 mm), which has an excellent effect such as flaw detection of the notch with a high S / N ratio.
【図１】本発明による超音波探触子の外形図である。FIG. 1 is an outline view of an ultrasonic probe according to the present invention.
【図２】本発明による超音波探触子による超音波の伝播
状態を示す図である。FIG. 2 is a diagram showing a state of propagation of ultrasonic waves by the ultrasonic probe according to the present invention.
【図３】従来の超音波探触子による図２と同様の図であ
る。FIG. 3 is a view similar to FIG. 2 showing a conventional ultrasonic probe.
【図４】原子力圧力容器の部分断面斜視図である。FIG. 4 is a partial cross-sectional perspective view of a nuclear pressure vessel.
【図５】ノズル内面のコーナ部の超音波探傷検査方法を
示す模式図である。FIG. 5 is a schematic diagram showing an ultrasonic flaw detection inspection method for a corner portion on the inner surface of a nozzle.
１ 超音波探触子 ２ 被検査材（ノズル） ２ａ 凹面 ３ 超音波 ４ 超音波探触子 ５ 振動子 １０ 超音波探触子 １２ 振動子 １３ コネクタ １４ 探触子本体 １４ａ 接触面 １４ｂ 凹溝 １５ 取付け部 α 入射角 β 屈折角 Ｃ1 、Ｃ2 物質中の音波の伝播速度（音速） Ｓ ノッチ幅 ａ1,ａ2,ａ3,ａ 超音波の拡散幅1 Ultrasonic Probe 2 Inspected Material (Nozzle) 2a Concave Surface 3 Ultrasonic Wave 4 Ultrasonic Probe 5 Transducer 10 Ultrasonic Probe 12 Transducer 13 Connector 14 Probe Body 14a Contact Surface 14b Recessed Groove 15 Attachment part α Incident angle β Refraction angle C1, C2 Propagation velocity (sound velocity) of sound wave in material S Notch width a 1 , a 2 , a 3, a Ultrasonic diffusion width
Claims (3)
内部に充填した探触子本体と、からなり、探触子本体は
被検査材の円弧状の凹面に接触する接触面を有し、振動
子は前記接触面側が膨らんだ凸面を有しかつ該凸面に直
交する方向に超音波を発射するようになっている、こと
を特徴とする超音波探触子。1. A transducer body which emits ultrasonic waves, and a probe body having the transducer body filled therein, the probe body having a contact surface for contacting an arcuate concave surface of a material to be inspected. An ultrasonic probe, wherein the transducer has a convex surface on which the contact surface side is swollen and emits ultrasonic waves in a direction orthogonal to the convex surface.
の凹面で屈折する超音波がほぼ平行に被検査材内に伝播
する大きさの円弧面に形成されている、ことを特徴とす
る請求項１に記載の超音波探触子。2. The convex surface of the vibrator is formed in an arc surface having a size in which ultrasonic waves refracted by the arc-shaped concave surface of the inspection material propagate in parallel to the inspection material. The ultrasonic probe according to claim 1.
材は金属製である、ことを特徴とする請求項１に記載の
超音波探触子。3. The ultrasonic probe according to claim 1, wherein the probe main body is made of resin and the material to be inspected is made of metal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7096406A JPH08292176A (en) | 1995-04-21 | 1995-04-21 | Ultrasonic probe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7096406A JPH08292176A (en) | 1995-04-21 | 1995-04-21 | Ultrasonic probe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08292176A true JPH08292176A (en) | 1996-11-05 |
Family
ID=14164093
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7096406A Pending JPH08292176A (en) | 1995-04-21 | 1995-04-21 | Ultrasonic probe |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08292176A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007114075A (en) * | 2005-10-21 | 2007-05-10 | Hitachi Ltd | Ultrasonic probe of ultrasonic flaw detector |
| JP2019506597A (en) * | 2015-12-18 | 2019-03-07 | エレクトリシテ ド フランス | Apparatus and method for inspecting and measuring welding defects on a cylindrical wall |
-
1995
- 1995-04-21 JP JP7096406A patent/JPH08292176A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007114075A (en) * | 2005-10-21 | 2007-05-10 | Hitachi Ltd | Ultrasonic probe of ultrasonic flaw detector |
| JP2019506597A (en) * | 2015-12-18 | 2019-03-07 | エレクトリシテ ド フランス | Apparatus and method for inspecting and measuring welding defects on a cylindrical wall |
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