JPH0219732Y2 - - Google Patents
Info
- Publication number
- JPH0219732Y2 JPH0219732Y2 JP1982010801U JP1080182U JPH0219732Y2 JP H0219732 Y2 JPH0219732 Y2 JP H0219732Y2 JP 1982010801 U JP1982010801 U JP 1982010801U JP 1080182 U JP1080182 U JP 1080182U JP H0219732 Y2 JPH0219732 Y2 JP H0219732Y2
- Authority
- JP
- Japan
- Prior art keywords
- ultrasonic
- thin tube
- flaw detection
- tube
- central axis
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000001514 detection method Methods 0.000 claims description 11
- 230000007246 mechanism Effects 0.000 claims description 4
- 235000019687 Lamb Nutrition 0.000 description 6
- 238000007689 inspection Methods 0.000 description 6
- 239000007788 liquid Substances 0.000 description 5
- 230000007547 defect Effects 0.000 description 4
- 238000003780 insertion Methods 0.000 description 4
- 230000037431 insertion Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 238000009413 insulation Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
- 230000029058 respiratory gaseous exchange Effects 0.000 description 1
- 239000010959 steel Substances 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
Landscapes
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
- Transducers For Ultrasonic Waves (AREA)
Description
【考案の詳細な説明】
本考案は細管探傷用超音波センサの改良に関す
る。[Detailed Description of the Invention] The present invention relates to an improvement of an ultrasonic sensor for thin tube flaw detection.
従来、細管の超音波探傷は例えば第１図に示す
如き斜角探傷法により行われている。 Conventionally, ultrasonic flaw detection of thin tubes has been carried out by, for example, the angle angle flaw detection method as shown in FIG.
図中１は水や油等の液体２が通過する細管であ
り、この細管１内に超音波センサ３が挿入されて
いる。細管１の探傷は、超音波センサ３から図中
の破線で示す如く超音波を送波して細管１中を伝
播させ、細管１中の図示しない欠陥によつて反射
されて逆の経過をたどつて返つてくる超音波を受
波し、図示しない電気回路で処理することによつ
て行われる。 In the figure, 1 is a thin tube through which a liquid 2 such as water or oil passes, and an ultrasonic sensor 3 is inserted into this thin tube 1. Flaw detection of the capillary tube 1 is carried out by transmitting ultrasonic waves from the ultrasonic sensor 3 as shown by the broken line in the figure, propagating them through the tube 1, and then being reflected by defects (not shown) in the tube 1, causing the reverse process. This is done by receiving the returning ultrasonic waves and processing them with an electric circuit (not shown).
しかし、上述した方法で細管１の全面に亘つて
探傷を行うためには、超音波センサ３あるいは細
管１を回転させながら超音波センサ３あるいは細
管１を移動させる等の操作が必要である。このた
め、検査時間が長くなり、供用期間中の検査には
適用が困難であるうえ、装置の規模が大きくなる
という欠点がある。 However, in order to perform flaw detection over the entire surface of the thin tube 1 using the method described above, operations such as moving the ultrasonic sensor 3 or the thin tube 1 while rotating the ultrasonic sensor 3 or the thin tube 1 are required. For this reason, the inspection time becomes long, it is difficult to apply this method to inspections during the service period, and the scale of the apparatus becomes large.
本考案は上記事情に鑑みてなされたものであ
り、検査時間を短縮するとともに、装置を小型化
し得る細管探傷用超音波センサを提供しようとす
るものである。 The present invention has been made in view of the above circumstances, and aims to provide an ultrasonic sensor for thin tube flaw detection that can shorten inspection time and downsize the device.
以下、本考案の実施例を第２図及び第３図を参
照して説明する。 Hereinafter, embodiments of the present invention will be described with reference to FIGS. 2 and 3.
第２図中１１は円筒状の超音波振動子であり、
その内部空間にはダンパー１２が充填されてい
る。この超音波振動子１１は外周をテーパー状と
した筒状のクサビ１３によつて包囲されており、
これらの中心軸は一致するように配設されてい
る。これら超音波振動子１１、ダンパー１２及び
クサビ１３で形成される円錐台体の前後面には
夫々遮音板１４1，１４2が配設されている。これ
ら遮音板１４1，１４2には周縁に多数の短冊状の
板バネを有する調芯機構１５1，１５2が密着され
ている。この調芯機構１５2には挿入管１６が挿
着されている。 11 in Fig. 2 is a cylindrical ultrasonic transducer,
A damper 12 is filled in the internal space. This ultrasonic transducer 11 is surrounded by a cylindrical wedge 13 with a tapered outer periphery.
These central axes are arranged to coincide. Sound insulating plates 14 1 and 14 2 are provided on the front and rear surfaces of the truncated cone body formed by the ultrasonic transducer 11, damper 12, and wedge 13, respectively. Centering mechanisms 15 1 and 15 2 having a large number of strip-shaped leaf springs on their peripheries are closely attached to these sound insulation plates 14 1 and 14 2 . An insertion tube 16 is inserted into this centering mechanism 15 2 .
上述した超音波センサを用いて細管の超音波探
傷を行うには、まず、第３図に示す如く水あるい
は油等の液体１７が満たされている細管１８内
に、超音波センサを調芯機構１５1，１５2（第３
図には図示せず）によつて超音波振動子１１及び
クサビ１３の中心軸と細管１８の中心軸とを一致
させつつ、挿入管１６（第３図には図示せず）で
挿入する。次に、図示しない電気回路によつて超
音波振動子１１に径方向のいわゆる呼吸振動を行
わせ、細管１８の中心軸に垂直に進む超音波を発
生させる。超音波は例えば超音波振動子１１のａ
点から破線で示す経路を通つてクサビ１３中を伝
播し、クサビ１３の斜面で屈折し、液体１７中を
通つて細管１８に達する。 In order to perform ultrasonic flaw detection on a thin tube using the above-mentioned ultrasonic sensor, first, as shown in FIG. 15 1 , 15 2 (3rd
While aligning the central axes of the ultrasonic transducer 11 and the wedge 13 with the central axis of the thin tube 18 using an insertion tube 16 (not shown in FIG. 3), the thin tube 18 is inserted using an insertion tube 16 (not shown in FIG. 3). Next, an electric circuit (not shown) causes the ultrasonic transducer 11 to perform so-called breathing vibration in the radial direction, thereby generating an ultrasonic wave that travels perpendicularly to the central axis of the thin tube 18. For example, the ultrasonic wave is transmitted by a of the ultrasonic vibrator 11.
It propagates through the wedge 13 from the point along the path shown by the broken line, is bent at the slope of the wedge 13, passes through the liquid 17, and reaches the thin tube 18.
ここで、クサビ１３の斜面と超音波振動子１１
とのなす角θは細管１８への超音波の入射角αが
細管１８中でラム波を発生させ得る角度となるよ
うに設定されており、θとαとの関係は下式で示
される。 Here, the slope of the wedge 13 and the ultrasonic vibrator 11
The angle θ between θ and α is set so that the incident angle α of the ultrasonic wave on the thin tube 18 is an angle that can generate a Lamb wave in the thin tube 18, and the relationship between θ and α is expressed by the following equation.
sin（θ−α）＝CC／CWsinθ
CC：液体１７中の音速
CW：クサビ１３中の超音波の縦波音速
例えば、クサビ１３がアクリル樹脂で、液体１
７が水の場合、CC＝1500m／ｓ、CW＝2730m／
ｓであり、θ＝34゜に設定すればα＝16.1゜となる。
これは周波数100kHz程度の超音波を用いれば肉
厚1.2mmの鋼製細管にS0モードのラム波を発生さ
せ得る入射角である。 sin(θ-α)=C C /C W sinθ C C : Speed of sound in liquid 17 C W : Longitudinal sound velocity of ultrasonic wave in wedge 13 For example, if wedge 13 is made of acrylic resin, liquid 1
If 7 is water, C C = 1500m/s, C W = 2730m/
s, and if θ=34°, α=16.1°.
This is an incident angle that can generate Lamb waves in the S 0 mode in a steel tube with a wall thickness of 1.2 mm using ultrasonic waves with a frequency of about 100 kHz.
ラム波は細管１８中を第３図中波線で示す如く
伝播し、このラム波が到達し得る範囲内に欠陥が
ある場合には、その欠陥によつて反射される。そ
して、上述した経路と逆の経路を通つて伝播し、
超音波振動子１１によつて受波された超音波は図
示しない電気回路によつて処理され、細管１８中
の欠陥を検出することができる。 The Lamb wave propagates through the thin tube 18 as shown by the dotted line in FIG. 3, and if there is a defect within the reachable range of the Lamb wave, it is reflected by the defect. Then, it propagates through the opposite route to the above-mentioned route,
The ultrasonic waves received by the ultrasonic transducer 11 are processed by an electric circuit (not shown), and defects in the thin tube 18 can be detected.
しかして本考案によれば、細管１８の全円周上
にラム波を発生させることができ、しかも、液体
１７にわずかに吸収されるだけであるので減衰が
少ない。したがつて、検査の際に超音波振動子１
１あるいは細管１８を回転させる必要がなく、減
衰の少ないラム波の到達する範囲を一度に探傷す
ることができる。この結果、検査時間を大幅に短
縮することができ供用期間中の検査にも適用でき
るうえ、装置も小型でよい。 According to the present invention, Lamb waves can be generated over the entire circumference of the thin tube 18, and since they are only slightly absorbed by the liquid 17, there is little attenuation. Therefore, during the inspection, the ultrasonic transducer 1
1 or the thin tube 18, and the range reached by the Lamb wave with little attenuation can be detected at once. As a result, the inspection time can be significantly shortened, it can be applied to inspections during the service period, and the device can also be small.
第１図は従来の斜角探傷法を示す説明図、第２
図は本考案の実施例における細管探傷用超音波セ
ンサを示す断面図、第３図は同センサを用いた超
音波探傷法を示す説明図である。
１１……超音波振動子、１２……ダンパー、１
３……クサビ、１４1，１４2……遮音板、１５1，
１５2……調芯機構、１６……挿入管。
Figure 1 is an explanatory diagram showing the conventional angle angle flaw detection method, Figure 2
The figure is a sectional view showing an ultrasonic sensor for thin tube flaw detection in an embodiment of the present invention, and FIG. 3 is an explanatory view showing an ultrasonic flaw detection method using the same sensor. 11... Ultrasonic vibrator, 12... Damper, 1
3... Wedge, 14 1 , 14 2 ... Sound insulation board, 15 1 ,
15 2 ... alignment mechanism, 16 ... insertion tube.
Claims (1)
超音波を送・受波する円筒状の超音波振動子と、
該超音波振動子の外周に配設され、外周が截頭円
錐面に形成された円筒状超音波転向部材と、これ
らの中心軸と細管の中心軸とを一致させる調芯機
構とを具備したことを特徴とする細管探傷用超音
波センサ。 A cylindrical ultrasonic vibrator that is inserted into a thin tube and transmits and receives ultrasonic waves that travel perpendicular to the central axis of the thin tube;
A cylindrical ultrasonic turning member disposed on the outer periphery of the ultrasonic transducer, the outer periphery of which is formed into a truncated conical surface, and an alignment mechanism for aligning the central axis of the cylindrical ultrasonic turning member with the central axis of the thin tube. An ultrasonic sensor for thin tube flaw detection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1080182U JPS58112959U (en) | 1982-01-28 | 1982-01-28 | Ultrasonic sensor for capillary flaw detection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1080182U JPS58112959U (en) | 1982-01-28 | 1982-01-28 | Ultrasonic sensor for capillary flaw detection |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58112959U JPS58112959U (en) | 1983-08-02 |
| JPH0219732Y2 true JPH0219732Y2 (en) | 1990-05-30 |
Family
ID=30023431
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1080182U Granted JPS58112959U (en) | 1982-01-28 | 1982-01-28 | Ultrasonic sensor for capillary flaw detection |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58112959U (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60205254A (en) * | 1984-03-30 | 1985-10-16 | Nippon Mining Co Ltd | Ultrasonic flaw detection for pipe |
| JPS61254851A (en) * | 1985-05-08 | 1986-11-12 | Agency Of Ind Science & Technol | Method for measuring depth of crack in material |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54121789A (en) * | 1978-03-15 | 1979-09-21 | Hitachi Ltd | Ultrasonic flaw detector for capillaries |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5525415Y2 (en) * | 1975-02-26 | 1980-06-18 | ||
| JPS54135986U (en) * | 1978-03-15 | 1979-09-20 |
-
1982
- 1982-01-28 JP JP1080182U patent/JPS58112959U/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54121789A (en) * | 1978-03-15 | 1979-09-21 | Hitachi Ltd | Ultrasonic flaw detector for capillaries |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58112959U (en) | 1983-08-02 |
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