JPS61196299A - Ultrasonic sound absorbing material - Google Patents
Ultrasonic sound absorbing materialInfo
- Publication number
- JPS61196299A JPS61196299A JP60036385A JP3638585A JPS61196299A JP S61196299 A JPS61196299 A JP S61196299A JP 60036385 A JP60036385 A JP 60036385A JP 3638585 A JP3638585 A JP 3638585A JP S61196299 A JPS61196299 A JP S61196299A
- Authority
- JP
- Japan
- Prior art keywords
- absorbing material
- sound absorbing
- ultrasonic sound
- ultrasonic
- attenuation constant
- 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
Landscapes
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
- Ultra Sonic Daignosis Equipment (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
〔発明の利用分野〕
本発明は超音波吸音材に係り、特に不要超音波を吸収す
るに適したシリコンゴムとタングステン粉の混合物の成
分に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to an ultrasonic sound absorbing material, and more particularly to components of a mixture of silicone rubber and tungsten powder suitable for absorbing unwanted ultrasonic waves.
超音波断層装置において超音波探触子よシ放射された超
音波は方位分解能を得るために指向性をもつ鋭いビーム
を形成する。第２図に示すように探触子の放射面に垂直
で中心位置に作られ、メインロープと呼ばれる。しかし
ながら音源を構成する点音源の干渉により図で３に示す
ように方位方向でサイドローブと呼ばれる極大と極小を
繰〕返して減衰していく。これは本来不要な超音波でメ
インロープにより送受信される信号に混入してアーチフ
ァクトを生じ、超音波画像のＳ／Ｎ劣化の原因となって
いる。In an ultrasonic tomography device, the ultrasonic waves emitted by the ultrasonic probe form a sharp beam with directivity in order to obtain lateral resolution. As shown in Figure 2, it is made perpendicular to the radiation surface of the probe and is located at the center, and is called the main rope. However, due to the interference of the point sound sources that make up the sound source, the sound attenuates by repeating maxima and minima called side lobes in the azimuth direction, as shown in Figure 3. This is an unnecessary ultrasonic wave that is mixed into the signal transmitted and received by the main rope, causing artifacts and causing S/N deterioration of the ultrasonic image.
本発明は、超音波画像の８／Ｎ向上を目的として超音波
探触子にて送受信される不要超音波を吸収する吸音材を
提供することにある。The present invention provides a sound absorbing material that absorbs unnecessary ultrasonic waves transmitted and received by an ultrasonic probe for the purpose of improving ultrasonic images by 8/N.
本発明は、減衰定数が５０ ｄ Ｂ ／ｃｍ〜７００’
ｄＢ／ｃＷ１、音響インピーダンスが１．３ＸｌＯ’１
４／、１−ｓｅｃ〜ｚ３ ＸＩ Ｏ’ Ｋｇ／ｍ”−１
１ｍの範囲にあるシリコンゴムとタングステン粉からな
る混合物を吸音材として用いるものである。The present invention has an attenuation constant of 50 dB/cm to 700'
dB/cW1, acoustic impedance is 1.3XlO'1
4/, 1-sec~z3 XI O'Kg/m"-1
A mixture of silicone rubber and tungsten powder within a range of 1 m is used as a sound absorbing material.
本発明の一実施例を以下に説明する。 An embodiment of the present invention will be described below.
第１図は信越化学社製シリコンゴム（ＫＥ６６ＲＴＶ
）と高比重（１９，１）のタングステン粉末を成分とす
る混合物のタングステン含有率に対する音響特性の測定
結果を示す。第２図−（ａ）は減衰定数であり第２図−
（ｂ）は音響インピーダンスである。横軸はタングステ
ン含有率で縦軸は前記各々の測定結果を示す。更に第２
図−（（支）においては周波数をパラメータとして減衰
定数を表し、４は３．５ Ｍ ＨＺ ％５は７．５ Ｍ
Ｈｚの測定値を示す。この結果からタングステン含有率
ｅｌｏ＃〜８０ｍの範囲で変化させた場合に減衰定数が
５０ｄＢ／ｃｒ１ｔ〜７００ｄＢ／ｃＰｎで音響インピ
ーダンスは１．３ＸＩＯ’Ｋｇ／ｄ・（８）〜λ３Ｘ１
０’Ｋｆ／−・□□□の値の得られることが判る。Figure 1 shows silicone rubber manufactured by Shin-Etsu Chemical (KE66RTV).
) and high specific gravity (19,1) tungsten powder as components. Figure 2 - (a) is the attenuation constant; Figure 2 -
(b) is the acoustic impedance. The horizontal axis shows the tungsten content, and the vertical axis shows the respective measurement results. Furthermore, the second
Figure - ((branch) shows the attenuation constant using frequency as a parameter, 4 is 3.5 MHz, %5 is 7.5 MHz
Measured values in Hz are shown. From this result, when changing the tungsten content in the range of elo#~80m, the attenuation constant is 50dB/cr1t~700dB/cPn and the acoustic impedance is 1.3XIO'Kg/d・(8)~λ3X1
It can be seen that a value of 0'Kf/-·□□□ is obtained.
〔発明の効果〕
以上の説明のように本発明によればシリコンゴムとタン
グステン粉末の混合物においてタングステン含有率を１
０１〜８０４の範囲で、減衰定数及び音響インピーダン
ス等の値を必要に応じて任意に設定することが可能で、
しかも約１ｍ程度の薄膜で十分の吸音効果を得ることが
できる。[Effects of the Invention] As explained above, according to the present invention, the tungsten content in the mixture of silicone rubber and tungsten powder is reduced to 1.
It is possible to arbitrarily set values such as attenuation constant and acoustic impedance within the range of 01 to 804 as necessary.
Moreover, a sufficient sound absorption effect can be obtained with a thin film of about 1 m.
第１図は本発明に係る実施例の吸音材の音響特性図であ
る。第２図は従来の吸音材を使用したときの超音波ビー
ムの説明図である。
１・・・音源、２・・・超音波ビームのメインロープ、
３・・・サイドローブ、４，５・・・減衰定数。
第 １ 回FIG. 1 is an acoustic characteristic diagram of a sound absorbing material according to an embodiment of the present invention. FIG. 2 is an explanatory diagram of an ultrasonic beam when a conventional sound absorbing material is used. 1... Sound source, 2... Main rope of the ultrasonic beam,
3... Side lobe, 4, 5... Attenuation constant. 1st
Claims (1)
るにシリコンゴムとタングステン粉末の混合物からなり
、タングステン含有率が１０〜８０％で減衰定数が５０
ｄＢ／ｃｍ〜７００ｄＢ／ｃｍ、音響インピーダンスが
１．３×１０＾６Ｋｇ／ｍ＾３／ｓｅｃ〜２．３×１０
＾６Ｋｇ／ｍ＾３・ｓｅｃの範囲にあることを特徴とす
る超音波吸音材。1. It is made of a mixture of silicone rubber and tungsten powder and has a tungsten content of 10-80% and an attenuation constant of 50 to absorb unnecessary radiated waves and reflected waves in the ultrasonic sound field.
dB/cm ~ 700dB/cm, acoustic impedance 1.3 x 10^6 Kg/m^3/sec ~ 2.3 x 10
An ultrasonic sound absorbing material characterized by being in the range of ^6Kg/m^3・sec.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60036385A JPS61196299A (en) | 1985-02-27 | 1985-02-27 | Ultrasonic sound absorbing material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60036385A JPS61196299A (en) | 1985-02-27 | 1985-02-27 | Ultrasonic sound absorbing material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61196299A true JPS61196299A (en) | 1986-08-30 |
Family
ID=12468378
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60036385A Pending JPS61196299A (en) | 1985-02-27 | 1985-02-27 | Ultrasonic sound absorbing material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61196299A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004058867A1 (en) * | 2002-12-26 | 2004-07-15 | Shanghai Jiao Tong University | Flexible composite with super-high specific gravity used in sound insulation and noise reduction |
| US7740682B2 (en) * | 2005-07-22 | 2010-06-22 | Ragan Randall C | High-density composite material containing tungsten powder |
-
1985
- 1985-02-27 JP JP60036385A patent/JPS61196299A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004058867A1 (en) * | 2002-12-26 | 2004-07-15 | Shanghai Jiao Tong University | Flexible composite with super-high specific gravity used in sound insulation and noise reduction |
| US7740682B2 (en) * | 2005-07-22 | 2010-06-22 | Ragan Randall C | High-density composite material containing tungsten powder |
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