JPS6229957Y2 - - Google Patents
Info
- Publication number
- JPS6229957Y2 JPS6229957Y2 JP1980039935U JP3993580U JPS6229957Y2 JP S6229957 Y2 JPS6229957 Y2 JP S6229957Y2 JP 1980039935 U JP1980039935 U JP 1980039935U JP 3993580 U JP3993580 U JP 3993580U JP S6229957 Y2 JPS6229957 Y2 JP S6229957Y2
- Authority
- JP
- Japan
- Prior art keywords
- ultrasonic
- acoustic impedance
- concave lens
- spherical concave
- ultrasonic transducer
- 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
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 36
- 239000000523 sample Substances 0.000 claims description 27
- 239000000463 material Substances 0.000 claims description 24
- 238000006243 chemical reaction Methods 0.000 claims description 14
- 238000001514 detection method Methods 0.000 claims description 14
- 238000007654 immersion Methods 0.000 claims description 13
- 230000005855 radiation Effects 0.000 claims description 5
- 230000007547 defect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 239000003822 epoxy resin Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 229920000647 polyepoxide Polymers 0.000 description 3
- 238000002604 ultrasonography Methods 0.000 description 3
- 239000004925 Acrylic resin Substances 0.000 description 2
- 229920000178 Acrylic resin Polymers 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Description
【考案の詳細な説明】
この考案は水浸探傷用集束形超音波探触子の改
良に関するものである。[Detailed description of the invention] This invention relates to an improvement of a focused ultrasonic probe for water immersion flaw detection.
まず、従来のこの種の超音波探触子について第
１図を用いて説明する。第１図において、１は超
音波振動子、２はダンパー、３は球面凹形レンズ
である。 First, a conventional ultrasonic probe of this type will be explained with reference to FIG. In FIG. 1, 1 is an ultrasonic transducer, 2 is a damper, and 3 is a spherical concave lens.
なおダンパー２は、超音波振動子１の機械的自
由振動を抑圧するためのものであり、このためダ
ンパー２の材料としては超音波振動子１と音響的
整合条件が良好なものが要求される。また、ダン
パー２は、図中矢印を施した点線で示すように超
音波振動子１の音響放射面S1上の各点からダンパ
ー２内へ放射される超音波パルスがダンパー裏面
S2で反射され再び超音波振動子１に雑音として受
信されないようにするため、超音波の減衰率が大
きいことが要求される。ところで従来においては
ダンパー２の材料としては、金属粉末の充てん剤
とエポキシ樹脂とを混合して製作して材料などを
用いることにより、上述の要求を満足するものが
得られていた。 Note that the damper 2 is for suppressing the mechanical free vibration of the ultrasonic vibrator 1, and therefore, the material of the damper 2 is required to have good acoustic matching conditions with the ultrasonic vibrator 1. . In addition, the damper 2 is configured such that the ultrasonic pulses radiated into the damper 2 from each point on the acoustic radiation surface S1 of the ultrasonic transducer 1 are transmitted to the back surface of the damper, as shown by the dotted line with an arrow in the figure.
In order to prevent the ultrasonic wave from being reflected by S2 and being received as noise by the ultrasonic transducer 1 again, the attenuation rate of the ultrasonic wave is required to be large. By the way, in the past, the damper 2 has been manufactured by mixing a metal powder filler and an epoxy resin, thereby satisfying the above-mentioned requirements.
一方、球面凹形レンズ３は、第１図に矢印を施
した点線で示すように、超音波振動子１の音響放
射面S3上の各点から放射され、球面凹形レンズ３
内を通過し、更に水中を通過し、水中に置かれた
被検材４内へ到達する超音波パルスを被検材４内
で集束させるためのものである。 On the other hand, as shown by dotted lines with arrows in FIG .
This is to focus the ultrasonic pulses that pass through the test material 4, pass through the water, and reach the test material 4 placed in the water.
したがつて、球面凹形レンズ３の材料として
は、水中の音速と異なる音速を有する材料を用い
る必要がある。従来、球面凹形レンズ３の材料と
しては、この条件を満足し、かつ、整形加工が比
較的簡便であるという理由により、アクリル樹
脂、エポキシ樹脂などの高分子材料が用いられて
いた。 Therefore, as the material for the spherical concave lens 3, it is necessary to use a material that has a sound speed different from the sound speed in water. Conventionally, polymeric materials such as acrylic resin and epoxy resin have been used as materials for the spherical concave lens 3 because they satisfy these conditions and are relatively easy to shape.
しかし、従来のこの種の超音波探触子には次の
ような欠点があつた。すなわち、球面凹形レンズ
３の材料として用いられているエポキシ樹脂、ア
クリル樹脂などの高分子材料の音響インピーダン
ス（密度と音速との積で定義される）は一般には
約３〜４×106Kg／m2×sec程度であり、水の音響
インピーダンスは約1.5×106Kg／m2・secであ
り、また超音波振動子１の音響インピーダンスは
一般に20〜40Kg／m2・secである。このように従
来のこの種の超音波探触子においては、球面凹形
レンズ３の音響インピーダンスと水の音響インピ
ーダンスとの比が1.0より大きく異なるため、超
音波振動子１から球面凹形レンズ３内へ放射され
た超音波パルスのエネルギーの一部は球面凹形レ
ンズ３と水との境界面S4で超音波振動子１の方向
へ反射されていた。 However, conventional ultrasonic probes of this type have the following drawbacks. That is, the acoustic impedance (defined as the product of density and sound velocity) of polymeric materials such as epoxy resin and acrylic resin used as the material of the spherical concave lens 3 is generally about 3 to 4 × 10 6 Kg. /m 2 ×sec, the acoustic impedance of water is about 1.5×10 6 Kg/m 2 ·sec, and the acoustic impedance of the ultrasonic transducer 1 is generally 20 to 40 Kg/m 2 ·sec. As described above, in this type of conventional ultrasound probe, since the ratio of the acoustic impedance of the spherical concave lens 3 to the acoustic impedance of water is significantly different from 1.0, A part of the energy of the ultrasonic pulse radiated inward was reflected toward the ultrasonic transducer 1 at the interface S 4 between the spherical concave lens 3 and water.
更に、上記したように球面凹形レンズ３の音響
インピーダンスと超音波振動子１の音響インピー
ダンスとの比も1.0より大きく異なるため、境界
面S4で超音波振動子１の方向へ反射された超音波
パルスのエネルギーの一部は、再び球面凹形レン
ズ３と超音波振動子１との境界面S3で球面凹形レ
ンズ３内へ反射されていた。容易にわかるように
境界面S3で反射された超音波パルスは再度上述の
過程をくり返すため、結局境界面S4と境界面S3と
の間で多重反射が生じ、したがつて従来のこの種
の超音波探触子においては超音波振動子から単一
の超音波パルスを球面凹形レンズ３内へ放射させ
ても、水中へ放射される超音波パルスは、第２図
に示すように上記の多重反射の過程を経て形成さ
れた複数個の超音波パルス列T1，T2，T3……と
なつていた。 Furthermore, as mentioned above, since the ratio of the acoustic impedance of the spherical concave lens 3 and the acoustic impedance of the ultrasonic transducer 1 is also much different than 1.0, the ultrasonic wave reflected in the direction of the ultrasonic transducer 1 at the interface S 4 A part of the energy of the sound wave pulse was reflected back into the spherical concave lens 3 at the interface S3 between the spherical concave lens 3 and the ultrasonic transducer 1. As can be easily seen, the ultrasonic pulse reflected from the interface S 3 repeats the above process again, resulting in multiple reflections between the interface S 4 and the interface S 3 , and therefore the conventional In this type of ultrasonic probe, even if a single ultrasonic pulse is emitted from the ultrasonic transducer into the spherical concave lens 3, the ultrasonic pulse emitted into the water is as shown in Fig. 2. A plurality of ultrasonic pulse trains T 1 , T 2 , T 3 . . . were formed through the above-mentioned multiple reflection process.
さて、このように複数個の超音波パルス列
T1，T2，T3……を水中へ放射する従来のこの種
の超音波探触子を用いて、第１図に示すように水
中に置かれた被検材４内の欠陥５等を深傷した場
合、そのときの受信信号は例えば第３図に示すよ
うになる。すなわち、受信信号は、欠陥５等によ
り反射されたいわゆる欠陥エコー信号F1，F2…
…のみでなく、一般に、水の音響インピーダンス
と被検材４の音響インピーダンス（例えば、被検
材４が鋼材の場合その音響インピーダンスは約45
×106Kg／m2・secである）とが異なるため、欠陥
５等からの受信信号F1，F2……に、水と被検材
４との境界面S5から反射された、いわゆる表面エ
コー信号E1，E2，……が重畳したものとなる。 Now, like this, multiple ultrasonic pulse trains
Using this type of conventional ultrasonic probe that emits T 1 , T 2 , T 3 ... into the water, defects 5 etc. in the test material 4 placed in the water are detected as shown in Fig. 1. If the device is seriously damaged, the received signal at that time will be as shown in FIG. 3, for example. That is, the received signals are so-called defect echo signals F 1 , F 2 . . . reflected by the defects 5 and the like.
...In general, the acoustic impedance of water and the acoustic impedance of the material to be tested 4 (for example, if the material to be tested 4 is steel, the acoustic impedance is approximately 45
×10 6 Kg/m 2 ·sec), the received signals F 1 , F 2 . The so-called surface echo signals E 1 , E 2 , . . . are superimposed.
すなわち従来のこの種の超音波探触子において
は、２番目以降の表面エコー信号E2，E3……が
欠陥エコー信号F1，F2……に対して雑音となる
ため、探傷時における信号対雑音比が悪いという
欠点があつた。 In other words, in conventional ultrasonic probes of this kind, the second and subsequent surface echo signals E 2 , E 3 . . . become noise with respect to the defect echo signals F 1 , F 2 . The drawback was a poor signal-to-noise ratio.
この考案は、超音波振動子と球面凹形レンズと
の間に、超音波振動子の音響インピーダンスと球
面凹形レンズの音響インピーダンスとの相乗平均
値で与えられる音響インピーダンスを有しかつ厚
さが４分の１波長の音響インピーダンス変換層を
挿入することにより、上記した欠点を解決しよう
とするものであり、以下詳細に説明する。 This device has an acoustic impedance between the ultrasonic transducer and the spherical concave lens, which is given by the geometric mean value of the acoustic impedance of the ultrasonic transducer and the acoustic impedance of the spherical concave lens. By inserting a quarter-wavelength acoustic impedance conversion layer, the above-mentioned drawbacks are attempted to be solved, and will be explained in detail below.
第４図に、この考案に係る水浸探傷用集束形超
音波探触子の構造を示す。第４図において１は超
音波振動子、２は超音波振動子１と音響的整合条
件が良好でかつ超音波の減衰率が大きい材料を用
いて製作したダンパー、３は水中の音速と異なる
音速を有する材料を用いて製作した球面凹形レン
ズであり、６はこの考案に係る音響インピーダン
ス変換層である。音響インピーダンス変換層６
は、超音波振動子１の音響インピーダンスと球面
凹形レンズ３の音響インピーダンスとの相乗平均
値で与えられる音響インピーダンスを有する材料
を用いて製作し、その厚さは４分の１波長にす
る。このような音響インピーダンス変換層６を超
音波振動子１と球面凹形レンズ３との間に挿入す
ると、超音波振動子１と音響インピーダンス変換
層６との境界面S3から球面凹形レンズ３の方向を
見込んだ音響インピーダンスと超音波振動子１の
音響インピーダンスとは等しくなり、逆に、球面
凹形レンズ３と音響インピーダンス変換層６との
境界面S6から超音波振動子１の方向を見込んだ音
響インピーダンスと、球面凹形レンズ３の音響イ
ンピーダンスとは等しくなる。 FIG. 4 shows the structure of a focused ultrasonic probe for water immersion flaw detection according to this invention. In Fig. 4, 1 is an ultrasonic transducer, 2 is a damper manufactured using a material that has good acoustic matching conditions with the ultrasonic transducer 1 and has a large attenuation rate of ultrasonic waves, and 3 is a sound velocity different from that in water. 6 is an acoustic impedance conversion layer according to this invention. Acoustic impedance conversion layer 6
is manufactured using a material having an acoustic impedance given by the geometric mean value of the acoustic impedance of the ultrasonic transducer 1 and the acoustic impedance of the spherical concave lens 3, and its thickness is set to 1/4 wavelength. When such an acoustic impedance conversion layer 6 is inserted between the ultrasound transducer 1 and the spherical concave lens 3, the spherical concave lens 3 is removed from the interface S3 between the ultrasound transducer 1 and the acoustic impedance conversion layer 6. The acoustic impedance looking in the direction of is equal to the acoustic impedance of the ultrasonic transducer 1, and conversely, when looking in the direction of the ultrasonic transducer 1 from the interface S6 between the spherical concave lens 3 and the acoustic impedance conversion layer 6, The expected acoustic impedance and the acoustic impedance of the spherical concave lens 3 become equal.
以上のごとく製作したこの考案に係る水浸探傷
用集束形超音波探触子では第４図に矢印を施した
点線で示すように超音波振動子１の音響放射面S1
上の各点からダンパー２内へ放射された超音波パ
ルスは、ダンパー２の材料として超音波の減衰率
が大きい材料を用いているので、従来のこの種の
超音波探触子の場合と同様に、ダンパー２の裏面
S2で反射され再び超音波振動子１に雑音として受
信されることはない。また、球面凹形レンズ３の
材料中の音速と水中の音速とは異なるため、第４
図に矢印を施した点線で示すように、超音波振動
子１の音響放射面S3上の各点から放射され、音響
インピーダンス変換層６および球面凹形レンズ３
内を通過し、更に水中を通過し、水中に置かれた
被検材４内へ到達した超音波パルスは、従来のこ
の種の超音波探触子の場合と同様に被検材４内で
集束する。 In the focused ultrasonic probe for water immersion flaw detection according to this invention manufactured as described above, the acoustic radiation surface S 1 of the ultrasonic transducer 1 is shown by the dotted line with an arrow in FIG.
The ultrasonic pulses emitted from each point above into the damper 2 are the same as in the case of conventional ultrasonic probes of this type because the damper 2 is made of a material with a large attenuation rate of ultrasonic waves. , the back side of damper 2
It is reflected by S2 and is not received by the ultrasonic transducer 1 again as noise. Also, since the sound speed in the material of the spherical concave lens 3 is different from the sound speed in water, the fourth
As shown by dotted lines with arrows in the figure, the waves are radiated from each point on the acoustic radiation surface S3 of the ultrasonic transducer 1, and are emitted from the acoustic impedance conversion layer 6 and the spherical concave lens 3.
The ultrasonic pulses that have passed through the interior of the specimen, further passed through the water, and reached the specimen 4 placed in the water are transmitted inside the specimen 4 as in the case of conventional ultrasonic probes of this type. Focus.
さて、この考案に係る水浸探傷用集束形超音波
探触子においては、超音波振動子１と球面凹形レ
ンズ３との間に音響インピーダンス変換層６を挿
入しているため、前記した理由により超音波振動
子１から音響インピーダンス変換層６内へ放射さ
れた超音波パルスのエネルギーは、境界面S6では
反射されず、すべて球面凹形レンズ３内に入射す
る。 Now, in the focused ultrasonic probe for water immersion flaw detection according to this invention, the acoustic impedance conversion layer 6 is inserted between the ultrasonic transducer 1 and the spherical concave lens 3. The energy of the ultrasonic pulse emitted from the ultrasonic transducer 1 into the acoustic impedance conversion layer 6 is not reflected at the boundary surface S 6 and is entirely incident on the spherical concave lens 3.
次に、球面凹形レンズ３の音響インピーダンス
と水の音響インピーダンスとは一般に異なるた
め、上記の過程を経て球面凹形レンズ３内に入射
した超音波パルスのエネルギーの一部は、従来の
この種の超音波探触子の場合と同様に、球面凹形
レンズ３と水との境界面S4で音響インピーダンス
変換層６の方向へ反射される。しかし、境界面S4
で反射された超音波パルスのエネルギーは、従来
のこの種の超音波探触子の場合とは異なり、この
考案に係る超音波探触子では、球面凹形レンズ３
と超音波振動子１との間に音響インピーダンス変
換層６を挿入しているため、前記した理由により
境界面S6，S3では反射されず、すべて超音波振動
子１内に入射する。 Next, since the acoustic impedance of the spherical concave lens 3 and the acoustic impedance of water are generally different, part of the energy of the ultrasonic pulse that has entered the spherical concave lens 3 through the above process is As in the case of the ultrasonic probe, the light is reflected toward the acoustic impedance conversion layer 6 at the interface S 4 between the spherical concave lens 3 and water. However, the boundary surface S 4
Unlike in conventional ultrasonic probes of this type, the energy of the ultrasonic pulse reflected by the spherical concave lens 3
Since the acoustic impedance conversion layer 6 is inserted between the acoustic impedance converting layer 6 and the ultrasonic transducer 1, the light is not reflected at the interfaces S 6 and S 3 for the reason described above, and all of the light enters the ultrasonic transducer 1.
次にダンパー２の材料としては、超音波振動子
１と音響的整合条件が良好な材料を用いているた
め、このように超音波振動子１内へ入射した超音
波パルスのエネルギーは超音波振動子１とダンパ
ー２との境界面S1においても反射されず、すべて
ダンパー２内へ入射する。更に、ダンパー２内へ
入射した超音波パルスのエネルギーはダンパー２
の材料として超音波の減衰率が大きい材料を用い
ているため前述したようにダンパー裏面S2で反射
され再び超音波振動子１に受信されることはな
い。すなわち、この考案に係る水浸探傷用超音波
探触子においては、従来のこの種の超音波探触子
の場合とは異なり、超音波探触子内部で多重反射
は生じず、このため第５図に示すように超音波振
動子１から単一の超音波パルスを放射させれば、
水中に放射される超音波パルスも単一となる。 Next, since the damper 2 is made of a material that has good acoustic matching conditions with the ultrasonic transducer 1, the energy of the ultrasonic pulse incident into the ultrasonic transducer 1 is transferred to the ultrasonic vibration. It is not reflected at the interface S1 between the child 1 and the damper 2, and all of it enters the damper 2. Furthermore, the energy of the ultrasonic pulse that entered the damper 2
Since a material with a high attenuation rate for ultrasonic waves is used as the material, the waves are reflected from the back surface S2 of the damper and are not received by the ultrasonic transducer 1 again, as described above. That is, in the ultrasonic probe for water immersion flaw detection according to this invention, unlike in the case of conventional ultrasonic probes of this type, multiple reflections do not occur inside the ultrasonic probe, and therefore If a single ultrasonic pulse is emitted from the ultrasonic transducer 1 as shown in Figure 5,
The ultrasonic pulse emitted into the water is also single.
したがつて、この考案に係る超音波探触子を用
いて、水中に置かれた被検材４内の欠陥５等を探
傷した場合、受信信号において被検材４と水との
境界面S5より反射される表面エコー信号も第６図
に示すように単一となり、探傷時における信号対
雑音比が改善されることがわかる。 Therefore, when detecting defects 5 etc. in the test material 4 placed in water using the ultrasonic probe according to this invention, the interface S between the test material 4 and water is detected in the received signal. The surface echo signal reflected from 5 becomes single as shown in Fig. 6, and it can be seen that the signal-to-noise ratio during flaw detection is improved.
以上のように、この考案に係る水浸探傷用集束
形超音波探触子では、超音波振動子と球面凹形レ
ンズとの間に、超音波振動子の音響インピーダン
スと球面凹形レンズの音響インピーダンスとの相
乗平均値で与えられる音響インピーダンスを有
し、かつ厚さが４分の１波長の音響インピーダン
ス変換層を挿入することにより、超音波探触子内
部での多重反射を除去でき、探傷時における信号
対雑音比を改善できる利点がある。 As described above, in the focused ultrasonic probe for water immersion flaw detection according to this invention, between the ultrasonic transducer and the spherical concave lens, the acoustic impedance of the ultrasonic transducer and the acoustic impedance of the spherical concave lens are By inserting an acoustic impedance conversion layer with an acoustic impedance given by the geometric mean value of the impedance and a thickness of 1/4 wavelength, multiple reflections inside the ultrasonic probe can be removed and flaw detection This has the advantage of improving the signal-to-noise ratio at times.
第１図は従来の水浸探傷用集束形超音波探触子
の構成図、第２図は従来の水浸探傷用集束形超音
波探触子において水中に放射される超音波パルス
列を示す図、第３図は従来の水浸探傷用集束形超
音波探触子における受信信号を示す図、第４図は
この考案に係る水浸探傷用集束形超音波探触子の
構成図、第５図はこの考案に係る水浸探傷用集束
形超音波探触子において水中に放射される超音波
パルスを示す図、第６図はこの考案に係る水浸探
傷用集束形超音波探触子における受信信号を示す
図である。
図中、１は超音波振動子、２はダンパー、３は
球面凹形レンズ、４は水中に置かれた被検材、５
は欠陥等、６は音響インピーダンス変換層であ
る。なお、図中同一あるいは相当部分には同一符
号を付して示してある。
Figure 1 is a configuration diagram of a conventional focused ultrasonic probe for water immersion flaw detection, and Figure 2 is a diagram showing an ultrasonic pulse train emitted into water in a conventional focused ultrasonic probe for water immersion flaw detection. , FIG. 3 is a diagram showing received signals in a conventional focused ultrasonic probe for water immersion flaw detection, FIG. 4 is a configuration diagram of the focused ultrasonic probe for water immersion flaw detection according to this invention, and FIG. Figure 6 shows the ultrasonic pulses emitted into water in the focused ultrasonic probe for water immersion flaw detection according to this invention. FIG. 3 is a diagram showing a received signal. In the figure, 1 is an ultrasonic transducer, 2 is a damper, 3 is a spherical concave lens, 4 is a test material placed in water, and 5
6 is an acoustic impedance conversion layer. It should be noted that the same or corresponding parts in the figures are indicated by the same reference numerals.
Claims (1)
動子の音響インピーダンスに近い音響インピーダ
ンスを有し、かつ超音波の減衰率が大きい材料を
用いて形成したダンパーを設けるとともに、他方
の音響放射面には、水中の音速と異なる音速を有
する材料を用いて形成した球面凹形レンズを設け
た水浸探傷用集束形超音波探触子において、超音
波振動子と球面凹形レンズとの間に、超音波振動
子の音響インピーダンスと球面凹形レンズの音響
インピーダンスとの相乗平均値で与えられる音響
インピーダンスを有し、かつ厚さが４分の１波長
の音響インピーダンス変換層を挿入したことを特
徴とする水浸探傷用集束形超音波探触子。 A damper made of a material having an acoustic impedance close to that of the ultrasonic transducer and having a large attenuation rate for ultrasonic waves is provided on one acoustic radiation surface of the ultrasonic transducer, and a damper is provided on one acoustic radiation surface of the ultrasonic vibrator. In a focused ultrasonic probe for water immersion testing, which has a spherical concave lens formed on its surface using a material with a sound velocity different from the sound velocity in water, there is a gap between the ultrasonic transducer and the spherical concave lens. , an acoustic impedance conversion layer having an acoustic impedance given by the geometric mean value of the acoustic impedance of the ultrasonic transducer and the acoustic impedance of the spherical concave lens and having a thickness of 1/4 wavelength is inserted. Features of a focused ultrasonic probe for water immersion flaw detection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1980039935U JPS6229957Y2 (en) | 1980-03-26 | 1980-03-26 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1980039935U JPS6229957Y2 (en) | 1980-03-26 | 1980-03-26 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS56142466U JPS56142466U (en) | 1981-10-27 |
| JPS6229957Y2 true JPS6229957Y2 (en) | 1987-08-01 |
Family
ID=29635364
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1980039935U Expired JPS6229957Y2 (en) | 1980-03-26 | 1980-03-26 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6229957Y2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4450542A (en) * | 1982-03-05 | 1984-05-22 | Sperry Corporation | Multiple beam lens transducer for sonar systems |
-
1980
- 1980-03-26 JP JP1980039935U patent/JPS6229957Y2/ja not_active Expired
Non-Patent Citations (1)
| Title |
|---|
| ULTRASONIC ENGINEERING * |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS56142466U (en) | 1981-10-27 |
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