KR100285185B1 - 제한된 평면파의 중첩에 의한 구면파의 형성방법 - Google Patents
제한된 평면파의 중첩에 의한 구면파의 형성방법 Download PDFInfo
- Publication number
- KR100285185B1 KR100285185B1 KR1019980036792A KR19980036792A KR100285185B1 KR 100285185 B1 KR100285185 B1 KR 100285185B1 KR 1019980036792 A KR1019980036792 A KR 1019980036792A KR 19980036792 A KR19980036792 A KR 19980036792A KR 100285185 B1 KR100285185 B1 KR 100285185B1
- Authority
- KR
- South Korea
- Prior art keywords
- wave
- linear transducer
- spherical wave
- spherical
- waves
- Prior art date
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Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/29—Combinations of different interacting antenna units for giving a desired directional characteristic
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
- Transducers For Ultrasonic Waves (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
Description
Claims (3)
- 선형트랜스듀서로부터 구면파를 형성하는 방법에 있어서,상기 실제 선형트랜스듀서보다 뒤에 위치하고, 다수 제한된 평면파들이 중첩되는 에너지중심이 한 소자로 집중되는 것을 방지하기위해 도입한 가상의 선형트랜스듀서에서 송신한 제한된 평면파와 등가적인 평면파를 상기 실제 선형트랜스듀서가 송신하는 단계; 및상기 다수 제한된 평면파들을 중첩함으로써 구면파를 형성하는 단계를 포함하는 구면파형성방법.
- 제 1항에 있어서, 원거리에서 상기 다수 제한된 평면파들의 중첩은 극좌표계에서 프라운호퍼식에 의해 다음 수식과 같이 표현되는 것을 특징으로 하는 구면파형성방법.여기에서,
Lφ fraun(θ) - 제 1항에 있어서, 근거리에서 상기 다수 제한된 평면파를 중첩한 파는 다음 수식과 같이 표현되며, r의 값이 커지면 (wcosθ/λ)sinc(wu)에 근접하는 파형을 지님으로써 하나의 소자에서 송신되는 것과 같은 구면파를 형성하는 것을 특징으로 하는 구면파형성방법.여기에서, r은 선형 트랜스듀서의 중심에서 임의 지점까지 거리, k(=2π/λ)는 파수이다.
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1019980036792A KR100285185B1 (ko) | 1998-09-07 | 1998-09-07 | 제한된 평면파의 중첩에 의한 구면파의 형성방법 |
JP11250669A JP3136143B2 (ja) | 1998-09-07 | 1999-09-03 | 多数の制限された平面波の重畳による球面波形成方法 |
EP99117352A EP0986128A1 (en) | 1998-09-07 | 1999-09-03 | Method for forming a spherical wave by superposition of a plurality of limited plane waves |
US09/391,143 US6292434B1 (en) | 1998-09-07 | 1999-09-07 | Method for forming a spherical wave by superposition of a plurality of limited plane waves |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1019980036792A KR100285185B1 (ko) | 1998-09-07 | 1998-09-07 | 제한된 평면파의 중첩에 의한 구면파의 형성방법 |
Publications (2)
Publication Number | Publication Date |
---|---|
KR20000018936A KR20000018936A (ko) | 2000-04-06 |
KR100285185B1 true KR100285185B1 (ko) | 2001-03-15 |
Family
ID=19549802
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
KR1019980036792A KR100285185B1 (ko) | 1998-09-07 | 1998-09-07 | 제한된 평면파의 중첩에 의한 구면파의 형성방법 |
Country Status (4)
Country | Link |
---|---|
US (1) | US6292434B1 (ko) |
EP (1) | EP0986128A1 (ko) |
JP (1) | JP3136143B2 (ko) |
KR (1) | KR100285185B1 (ko) |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2707883A1 (de) * | 1977-02-24 | 1978-08-31 | Krautkraemer Gmbh | Verfahren zur erzeugung fokussierter schallwellen durch laserimpulse |
JPS55129776A (en) * | 1979-03-29 | 1980-10-07 | Yokogawa Hokushin Electric Corp | Sound field scanning method in phased array sonar |
FR2536175A1 (fr) * | 1982-11-16 | 1984-05-18 | Thomson Csf | Dispositif acousto-optique d'analyse de spectre |
US4948253A (en) * | 1988-10-28 | 1990-08-14 | Zygo Corporation | Interferometric surface profiler for spherical surfaces |
-
1998
- 1998-09-07 KR KR1019980036792A patent/KR100285185B1/ko not_active IP Right Cessation
-
1999
- 1999-09-03 JP JP11250669A patent/JP3136143B2/ja not_active Expired - Lifetime
- 1999-09-03 EP EP99117352A patent/EP0986128A1/en not_active Withdrawn
- 1999-09-07 US US09/391,143 patent/US6292434B1/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JP3136143B2 (ja) | 2001-02-19 |
US6292434B1 (en) | 2001-09-18 |
KR20000018936A (ko) | 2000-04-06 |
JP2000131421A (ja) | 2000-05-12 |
EP0986128A1 (en) | 2000-03-15 |
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