JP5183640B2 - 超音波撮像装置 - Google Patents
超音波撮像装置 Download PDFInfo
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
- B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
- B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
- B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
- B06B1/0292—Electrostatic transducers, e.g. electret-type
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
- B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
- B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
- B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
- B06B1/0207—Driving circuits
- B06B1/0215—Driving circuits for generating pulses, e.g. bursts of oscillations, envelopes
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/52—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00
- G01S7/52017—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00 particularly adapted to short-range imaging
- G01S7/52019—Details of transmitters
- G01S7/5202—Details of transmitters for pulse systems
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
- G01S15/88—Sonar systems specially adapted for specific applications
- G01S15/89—Sonar systems specially adapted for specific applications for mapping or imaging
- G01S15/8906—Short-range imaging systems; Acoustic microscope systems using pulse-echo techniques
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Transducers For Ultrasonic Waves (AREA)
- Ultra Sonic Daignosis Equipment (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Description
2 固定電極
3 可動電極
4 絶縁膜
5 絶縁膜
6 ダイアフラム層
7 空隙層
8 支持壁
13 結線
20 直流電源
21 D/Aコンバータ
22 A/Dコンバータ
23 電圧リミッター
31 送受切り替えスイッチ
32 電源
33 送信アンプ
34 受信アンプ
35 送信ビームフォーマ
36 受信ビームフォーマ
37 制御部
38 信号処理部
39 スキャンコンバータ
41 正負対称入力波形
42 正負対称波形入力のときの送信波形
43 正負非対称入力波形
44 正負非対称入力のときの送信波形
50 正側エンベロープ波形
51 負側エンベロープ波形
52 キャリア波形
53 正側エンベロープ波形
54 負側エンベロープ波形
55 キャリア波形
60 表示部
61 送信ゲイン
70 正負対称波形 駆動電圧
71 正負対称波形入力時のダイアフラム変位
72 正負対称波形入力時の送信波形
80 正負非対称波形 駆動電圧 正負振幅比2固定
81 正負非対称波形 駆動電圧 正負振幅比3固定
82 正負非対称波形入力時のダイアフラム変位 正負振幅比2固定
83 正負非対称波形入力時のダイアフラム変位 正負振幅比3固定
84 正負非対称波形入力時の送信波形 正負振幅比2固定
85 正負非対称波形入力時の送信波形 正負振幅比3固定
90 正負非対称波形 駆動電圧 正負振幅比可変(最大2)
91 正負非対称波形 駆動電圧 正負振幅比可変(最大3)
92 正負非対称波形入力時のダイアフラム変位 正負振幅比可変(最大2)
93 正負非対称波形入力時のダイアフラム変位 正負振幅比可変(最大3)
94 正負非対称波形入力時の送信波形 正負振幅比可変(最大2)
95 正負非対称波形入力時の送信波形 正負振幅比可変(最大3)
100 超音波トランスデューサ
110 キャリア波形
111 ガウスエンベロープ
210 音響レンズ
220 音響整合層
230 バッキング材
240 導電性膜
1000 超音波トランスデューサアレイ
2000 超音波探触子
この式(1)のように、静電気力は同じ印加電圧、同じ電極面積に対しては、電極間の距離d(t)が小さいほど大きくなるという交流電圧Vac(t)に対して非線形性を持つ。従って、d(t)が小さくなるような状況、すなわちVac(t)が大きくなり、ダイアフラム層6がより基板に近づくような状況では、より大きな静電気力が働き、またその逆の状況では小さな静電気力しか働かない。このとき、図4(A)のように交流電圧Vac(t)を正負対称波形とすると、図4(B)のように正負非対称の波形が音圧として出力される。
ここで、sin(ωt)はキャリアとなる波形、Gauss(t)はキャリアに重畳されるガウスエンベロープ関数、Ratio(gauss(t), polarity)は正負の振幅重みで、ガウス関数と正負の関数になっている。つまり、図7に示した従来型の印加電圧は、式(2)のRatioが時間的に常に1であり(Ratio=1)、図8の場合は、Ratioがガウス関数gauss(t)に比例した重みを正負の極性に応じて乗ずることを示す。例えば、エンベロープの頂上の最も振幅が大きくなる点(図7で、エンベロープ関数の時間的に中心点、Time=1us)において、正負振幅比がb/a=2(波形90)又は3(波形91)となり、それ以外の点では、エンベロープの関数に比例して小さくなる。また、正負非対称波形においては、電圧値によっては負側の振幅が直流バイアス電圧より大きくなる可能性がある。この場合、本来小さくすべき電位差が逆に大きくなり、静電気力が電極間に吸引方向の力を生む。これは負側に電圧を下げるときの目的とは逆方向である。そこで、このような場合、つまり直流バイアス電圧と交流電圧の和(Vdc+Vac)が直流バイアス電圧の符号と逆になるときは、リミッターをかけて交流電圧の振幅を低減させ、この和が直流電圧の符号と逆とならないようにする。
Claims (10)
- 第1電極と、前記第1電極を覆う第1部材と、前記第1電極と対向して設置される第2電極と、前記第2電極を覆う第2部材と、前記第1部材と前記第2部材と接続する壁部材とを有するセルを複数備えるセルアレイと、
前記第1電極と前記第2電極との間に印加する電圧を制御する電圧制御部とを有し、
前記制御部は、前記第1電極と前記第2電極との間に直流電圧を印加する直流電圧印加部と、前記第1電極と前記第2電極との間に交流電圧を印加する交流電圧印加部と、前記交流電圧と前記直流電圧の電圧値とに基づいて前記交流電圧の正負における振幅比を経時変動するように制御する波形制御部とを有することを特徴とする超音波撮像装置。 - 前記波形制御部は、前記交流電圧の波形の前記直流電圧の値より高い領域の振幅と低い領域の振幅とについて、比が経時変動するように制御することを特徴とする請求項1に記載の超音波撮像装置。
- 前記波形制御部は、前記交流電圧の波形の前記直流電圧の値より高い領域の振幅と低い領域の振幅とについて非対称にすることを特徴とする請求項1に記載の超音波撮像装置。
- 前記波形制御部は、前記交流電圧の波形を、複数の波数を有する波形とすることを特徴とする請求項1に記載の超音波撮像装置。
- 前記波形制御部は、前記交流電圧の波形を、キャリア波形にエンベロープ関数を重畳した波形とすることを特徴とする請求項1に記載の超音波撮像装置。
- 前記波形制御部は、前記交流電圧の波形について、前記直流電圧の値より高い領域と低い領域において、振幅比が可変に制御することを特徴とする請求項1に記載の超音波撮像装置。
- 前記波形制御部は、前記交流電圧の波形を、時間方向にエンベロープ関数が重畳された波形とすることを特徴とする請求項1に記載の超音波撮像装置。
- 前記波形制御部は、前記交流電圧の波形を、キャリア波形にエンベロープ関数及び正負の振幅重み関数を重畳した波形とすることを特徴とする請求項1に記載の超音波撮像装置。
- 前記波形制御部は、前記交流電圧の波形の前記比を、ガウスエンベロープ関数に比例して変化させることを特徴とする請求項2に記載の超音波撮像装置。
- 前記波形制御部は、前記交流電圧の波形について、前記直流電圧と前記交流電圧の和が前記直流電圧の符号と逆になるときに前記交流電圧の振幅を低減させることを特徴とする請求項1に記載の超音波撮像装置。
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JP2009541178A JP5183640B2 (ja) | 2007-11-16 | 2008-11-14 | 超音波撮像装置 |
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JP2007297425 | 2007-11-16 | ||
JP2007297425 | 2007-11-16 | ||
JP2009541178A JP5183640B2 (ja) | 2007-11-16 | 2008-11-14 | 超音波撮像装置 |
PCT/JP2008/070738 WO2009063964A1 (ja) | 2007-11-16 | 2008-11-14 | 超音波撮像装置 |
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JPWO2009063964A1 JPWO2009063964A1 (ja) | 2011-03-31 |
JP5183640B2 true JP5183640B2 (ja) | 2013-04-17 |
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US (1) | US20100256498A1 (ja) |
EP (1) | EP2213239B1 (ja) |
JP (1) | JP5183640B2 (ja) |
CN (1) | CN101854866B (ja) |
WO (1) | WO2009063964A1 (ja) |
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- 2008-11-14 WO PCT/JP2008/070738 patent/WO2009063964A1/ja active Application Filing
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Also Published As
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EP2213239B1 (en) | 2018-11-07 |
CN101854866B (zh) | 2012-09-19 |
WO2009063964A1 (ja) | 2009-05-22 |
EP2213239A1 (en) | 2010-08-04 |
JPWO2009063964A1 (ja) | 2011-03-31 |
US20100256498A1 (en) | 2010-10-07 |
EP2213239A4 (en) | 2016-10-26 |
CN101854866A (zh) | 2010-10-06 |
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