• 제목/요약/키워드: Transmitting voltage response

검색결과 33건 처리시간 0.022초

도플러 속도계(DVL)를 위한 광대역 수중 음향 트랜스듀서 (Broad-Band Underwater Acoustic Transducer for Doppler Velocity Log)

  • 윤철호;이영필;고낙용;문용선
    • 제어로봇시스템학회논문지
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    • 제19권9호
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    • pp.755-759
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    • 2013
  • A broad-band underwater acoustic transducer that uses thickness vibration mode, derived from a disk type piezoelectric ceramic, has been proposed and designed for DVL (Doppler Velocity Log). Three different types of acoustic transducer were evaluated with respect to the transmitting voltage response, receiving voltage sensitivity and bandwidth of the transducer. The effect of the acoustic impedance matching layer and backing layer is discussed. The results demonstrated that three matching layer with lossy backing layer is the best configuration for underwater transducer. The trial underwater acoustic transducer with three matching layer has a frequency bandwidth of 55%, maximum transmitting voltage response of 200 dB and a maximum receiving voltage sensitivity of -187.3 dB.

저주파 수중 반향음 제어를 위한 타일형 프로젝터의 개발 및 성능시험 (Development and Test of a Tile Projector for Control of Low-frequency Underwater Echoes)

  • 우상범;이재완;엄원석;김완구;강휘석;윤석왕;서영수
    • 한국소음진동공학회:학술대회논문집
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    • 한국소음진동공학회 2014년도 추계학술대회 논문집
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    • pp.630-634
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    • 2014
  • In this paper, a tile projector was developed for the control of low-frequency underwater echoes. The projector was designed to cover a wide area such as the hull of a submarine, and to have a relatively thin thickness. As a preliminary work for active echo control, the performance of the projector was measured in an anechoic water tank. The transmitting voltage response as well as the passive echo reduction were measured to evaluate the performance as an underwater projector.

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거리 측정용 1-3형 복합압전체 트랜스듀서의 펄스에코 응답 특성 (Pulse-echo response of 1-3 type piezoelectric composite transducers for distance measurement)

  • 최헌일;박정학;이수호;사공건
    • E2M - 전기 전자와 첨단 소재
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    • 제8권2호
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    • pp.211-216
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    • 1995
  • In this study, the piezoelectric ceramics/polymer composite transducers with 1-3 connectivity have been studied. A piezoelectric ceramics PZT prepared by Wet-Dry Combination method was used as a filler in polymer matrix Eccogel. We've got the pulse-echo response for 1-3 type piezc-electric composite transducers in water. It was shown that the transmitting and receiving sensitivity of 1-3 type piezoelectric composite transducers could be improved in comparison with that- of solid PZT transducers. The reason is for that 1-3 type Piezoelectric composites have low dielectric constant and density. There was in a good agreement between the resonant frequencies calculated from one period and observed results on the Ultrasonic Transducer Analyzer. According to these results we could be figured out the distance in water by virture of the pulse-echo response.

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고주파 전압 측정용 광섬유 센서 구현 (An Implementation of Fiber-Optic Sensor for High Frequency Voltage Measurements)

  • 박해수;오상기;김요희;이한철;노종대;김영수
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1999년도 하계학술대회 논문집 E
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    • pp.2444-2446
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    • 1999
  • In this paper, a fiber-optic voltage sensor for measurement of impulse voltage is implemented. A BSO single crystal is used as a Pockels cell. A new signal processing technique is adopted not only to avoid the influences of external perturbations of transmitting optical fiber, but to improve the frequency response characteristics of the optical voltage sensor. Experimental results show that proposed sensor has maximum ${\pm}$2.5% error rate, and has good frequency response.

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BSO와 YIG를 이용한 임펄스 전압, 전류 측정용 광센서 구현 (An implementation of fiber-optic sensors for impulse voltage and current measurement using a BSO and an YIG)

  • 송재성;김영수
    • 한국전기전자재료학회논문지
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    • 제13권8호
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    • pp.688-693
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    • 2000
  • In this paper an optical voltage sensor and an optical current sensor which can be used for the measurement of impulse voltage and current are implemented. BSO single crystal is utilized as a voltage sensor(Pockels effect cell). An rare earth doped YIG is used as a current sensor(Faraday effect cell). A new signal processing technique is adopted not only to avoid the influences o external optical fiber pertubations of transmitting optical fiber but also to improves the frequency response characteristics of the fiber-optic voltage and current sensors. Experimental results show that optical voltage sensor has maximum 2.5% error within the voltage range from 0V to 500V. and optical current sensor has maximum 2.5% error within the current range and that of optical current sensor is about 1.5% within temperature range from -2$0^{\circ}C$ to 6$0^{\circ}C$. The proposed optical sensors have good frequency response characteristics within the frequency range from DC to 10MHz.

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압전단결정을 이용한 소형 free-flooded ring 트랜스듀서의 성능 특성 예측 및 검증 (Analysis and verification of the characteristic of a compact free-flooded ring transducer made of single crystals)

  • 임종범;윤홍우;권병진;김경섭;이정민
    • 한국음향학회지
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    • 제41권3호
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    • pp.278-286
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    • 2022
  • 본 연구에서는 압전세라믹 기반의 상용 Free-Flooded Ring(FFR) 트랜스듀서 대비 소형이면서 저주파 고감도 특성을 확보하기 위해, 높은 압전상수와 전기-기계 결합계수를 가지는 압전단결정 PIN-PMN-PT를 적용한 33-모드 FFR 트랜스듀서를 설계하였다. FFR 트랜스듀서의 광대역 특성을 확보하기 위해 비능동소자를 삽입한 링 구조를 적용하였으며, 3종의 비능동소자 소재 별 특성 해석 결과를 비교하여 최적의 소재를 선정하였다. 링 트랜스듀서의 특성 변화를 최소화하기 위해 오일 충진형 FFR 트랜스듀서로 제작하였으며, 음향시험을 통해 송신감도, 수중 임피던스 및 수평/수직 빔패턴이 해석결과와 잘 일치하는지 확인하였다. 해석 및 시험 결과를 비교한 결과, 송신감도는 공동공진 주파수에서 약 1.3 dB, 구조공진 주파수에서는 약 0.3 dB 차이를 보였다. 또한 상용 트랜스듀서 대비 높은 송신감도를 보유하면서도 직경을 약 17 % 축소하여 제작할 수 있었다. 이를 통해 소형이면서 고출력 특성을 가지는 압전단결정적용 FFR 트랜스듀서의 구현 가능성과 해석을 통한 특성 예측 방법의 유효성을 확인하였다.

50 kHz 체장어군탐지기용 분할 빔 음향 변환기의 개발 (Development of Split-beam Acoustic Transducer for a 50 kHz Fish Sizing Echo Sounder)

  • 이대재;이원섭
    • 한국수산과학회지
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    • 제44권4호
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    • pp.413-422
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    • 2011
  • An improved split-beam transducer for a 50 kHz fish-sizing echo sounder was developed. The main objective of this study was to minimize the side lobe level in the beam pattern and the distance between acoustic centers for adjacent transducer quadrants in the geometrical arrangement of array elements while maintaining a given number of transducer elements and beam width. To achieve these goals, a 32-element planar array transducer ($6{\times}6$ array with one element in each corner missing) was designed using the Dolph-Chebyshev shading function to suppress side lobes in the array beam pattern and fabricated by arranging the inter-element spacing to be substantially equal to half the wavelength using the transducer element of 0.4 times the wavelength in diameter. The performance characteristics of this split-beam transducer were evaluated in the experimental water tank of $5m{\times}5m{\times}6m$ (length${\times}$height${\times}$width). In this study, the design goal of the beam width and side lobe level for transmitting a beam pattern was initially set at $21^{\circ}$ and -30 dB, respectively. However, the measured beam width at 3 dB was $21^{\circ}$ in both directions with side lobe levels of -24.7 dB in the horizontal plane and -25.6 dB in the vertical plane. The averaged beam width at -3 dB of the receiving beam patterns for four receiving quadrants was $31.4^{\circ}$. The transmitting voltage response was 161.5 dB (re $1{\mu}Pa$/V at 1 m) at 50.23 kHz with a bandwidth of 2.16 kHz, and the averaged receiving sensitivity for four receiving quadrants was -178.13 dB (re 1 V/${\mu}Pa$) at 49.8 kHz with a bandwidth of 2.64 kHz.

직류 전원선을 이용한 다중 접속 양방향 직렬통신 프로토콜 구현 (Implementation of multiple access bidirectional serial communications protocol using DC power line)

  • 한경호;김원일;황하윤
    • 한국철도학회:학술대회논문집
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    • 한국철도학회 2008년도 춘계학술대회 논문집
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    • pp.332-338
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    • 2008
  • This paper handles, implementation of multiple access bidirectional serial communications protocol using two common DC power lines, whict are power supply and ground, connecting multiple devices. Communication between the host and the multiple clients are performed using unique packet data with device ID unique to each devices connected on the common power lines. Host initiates data communications by transmitting command packet to the designated client with the client's ID and the client responds by transmitting response packet to the host and in this way, multiple clients and host exchange the packet through the common power lines. The normal voltage of the power communication line maintains 24V corresponding to level 1 and the host drops the voltage to 12V on sending level 0 signal, also the clients normally keeps the line voltage to 24V use pull-down circuit to drop the voltage to 12V on sending level 1 signal. Power supply originates from the host, the host senses the voltage level of the power communication lines and when the clients activates pull down circuit to send level 0 signal and the voltage drops to 12V, the hosts switches power source from 24V to 12V. Also, when clients deactivate pull down circuit to send level 1 signal, the host senses the voltage increase and switches the power source from 12V to 24V. Experimental circuit is designed with one hosts and four clients and verified the power line voltage switching operation depending on the data signal levels on the power line. The proposed research result can be applied to two wire power communications system with one host and multiple low current consumption clients.

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수중 음향 압전 트랜스듀서의 등가 회로 모델링 (Equivalent Circuit Modeling of Underwater Acoustic Piezoelectric Transducer)

  • 조치영;서희선;이정민
    • 한국음향학회지
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    • 제15권4호
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    • pp.77-82
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    • 1996
  • 본 연구에서는 샌드위치형 압전 트랜스듀서의 등가 회로 모델을 규명하는 방법을 제시하였다. 공기중에서 실험적으로 측정한 트랜스듀서의 전기적 어드미턴스와 이론적으로 계산된 어드미턴스의 오차가 최소가 되도록 하는 비선형 최적화 문제를 풀어 등가 회로에 관련된 미지 상수를 규명하였다. 예제 트랜스듀서에 대해 제안된 방법을 적용하여 등가회로를 모델링하고, 수중에서의 송신 음압 감도(TVR) 및 수신 읍압 감도(RVS)을 예측하고 실험치와 비교하여 규명된 등가 회로 모델의 타당성을 검증하였다.

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압전단결정(72PMN-28PT) 응용 수중음향 톤필츠 트랜스듀서 개발 (A Development of Underwater Acoustic Tonpilz Transducer with the Piezoelectric Single Crystal)

  • 권병진
    • 한국전기전자재료학회논문지
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    • 제29권9호
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    • pp.532-538
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    • 2016
  • In this paper, a underwater acoustic Tonpilz transducer with the piezoelectric single crystal(72PMN-28PT) is developed. The thickness and the number of piezoelectric elements are theoretically designed with the equivalent circuit analysis to have the desired resonance frequency. In order to compare the performances, a piezoelectric ceramic transducer is also manufactured and their electrical impedance, TVR (transmitting voltage response), RVS (receiving voltage response) and beam pattern are compared.