• 제목/요약/키워드: Ultrasonic Sensor

검색결과 835건 처리시간 0.029초

1-3형 압전복합체로 제작한 초음파센서와 신경회로망을 이용한 3차원 수중 물체인식 (The 3-D Underwater Object Recognition Using Neural Networks and Ultrasonic Sensor Fabricated with 1-3 Type Piezoelectric Composites)

  • 조현철;이기성
    • 대한전기학회논문지:전기물성ㆍ응용부문C
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    • 제50권7호
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    • pp.324-325
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    • 2001
  • In this study, the characteristics of ultrasonic sensor fabricated with PZT-Polymer 1-3 type composites are investigated. The 3-D Underwater object recognition using the self-made ultrasonic sensor and SOFM neural network is presented. The ultrasonic sensor is satisfied with the required condition of commercial ultrasonic sensor in underwater. The 3-D underwater object recognition for the training data and the testing data are 100[100%], respectively. The experimental results have shown that the ultrasonic sensor fabricated with PZT-Polymer 1-3 type composites can be applied for sonar system.

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초음파 센서를 이용한 Edge Position Controller (하드웨어) (Edge Position Controller by using ultrasonic sensor ( hardware ))

  • 전진욱;박찬원
    • 산업기술연구
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    • 제27권B호
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    • pp.97-101
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    • 2007
  • We have developed a Edge Position Controller (EPC) using a ultrasonic sensor and applied to a fabric machine as a web guide system. Hardware devices composed of a ultrasonic transmitter-receiver sensor module and microprocessor-based sensor signal processing system are developed to realize the proposed system. We evaluated the control characteristics of the EPC and the performance of the system was good enough to apply the actual system.

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원유 깊이 측정을 위한 초전도셀 최적화에 관한 연구 (Study on the Optimizing Ultrasonic Cell for Depth Measurement of Crude Oil)

  • 오규태
    • 전자공학회논문지
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    • 제54권1호
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    • pp.152-156
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    • 2017
  • 지금까지의 초음파센서와 관련된 연구 중 대부분은 대기 중에서 사용하거나 수중에서 사용하는 연구가 대부분이었다. 본 연구는 원유나 석유 등의 유종에서 사용하는 경우에 관한 것으로 초음파 소자에 고전압을 인가해야 하는 초음파의 특성 상 폭발의 위험이 있어 폭발에 대한 우려 없이 유종에서 초음파를 효과적으로 발생시키기 위한 초전도 셀의 특성에 대해 연구하였다. 본 연구를 통해 폭발의 위험이 없으면서 원유 등 유종에서 초음파를 투과하여 원유의 깊이를 측정하거나 원유 바닦의 슬러지를 측정할 수 있는 가장 적합한 초전도셀의 면적, 두께, 발사 주파수 등을 도출하였으며 초음파센서에 24V의 전압을 인가하여 200kHz 주파수를 발생시킬 경우, 초전도셀의 최적 직경은 26~28mm, 두께는 9mm로 하는 것이 최적임을 확인하였다.

Miniature Ultrasonic and Tactile Sensors for Dexterous Robot

  • Okuyama, Masanori;Yamashita, Kaoru;Noda, Minoru;Sohgawa, Masayuki;Kanashima, Takeshi;Noma, Haruo
    • Transactions on Electrical and Electronic Materials
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    • 제13권5호
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    • pp.215-220
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    • 2012
  • Miniature ultrasonic and tactile sensors on Si substrate have been proposed, fabricated and characterized to detect objects for a dexterous robot. The ultrasonic sensor consists of piezoelectric PZT thin film on a Pt/Ti/$SiO_2$ and/or Si diaphragm fabricated using a micromachining technique; the ultrasonic sensor detects the piezoelectric voltage as an ultrasonic wave. The sensitivity has been enhanced by improving the device structure, and the resonant frequency in the array sensor has been equalized. Position detection has been carried out by using a sensor array with high sensitivity and uniform resonant frequency. The tactile sensor consists of four or three warped cantilevers which have NiCr or $Si:B^+$ piezoresistive layer for stress detection. Normal and shear stresses can be estimated by calculation using resistance changes of the piezoresitive layers on the cantilevers. Gripping state has been identified by using the tactile sensor which is installed on finger of a robot hand, and friction of objects has been measured by slipping the sensor.

초음파와 전기전도 센서를 이용한 우레아 탱크 수위, 농도 및 온도의 동시 측정 방안 (Simultaneous Measurement of Liquid-level, Concentration and Temperature of a Urea Tank using Ultrasonic and Electrical Conductivity Sensors)

  • 최병철;김태욱
    • 동력기계공학회지
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    • 제21권5호
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    • pp.71-78
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    • 2017
  • The purpose of this study is to propose the basic data for the development of a sensor capable of simultaneously measuring the liquid-level, concentration and temperature of a urea tank using ultrasonic and electrical conductivity sensors for diesel vehicles with a urea-SCR system. It was found that the liquid-level of the urea tank using the ultrasonic sensor showed a good linearity with the actual liquid-level, and the urea concentration maintained good linearity in the range of 32.5 wt% to 10 wt%. It was an effective measurement of urea concentration to use the electrical conductivity sensor in the temperature range of $-10{\sim}22^{\circ}C$ and to use the ultrasonic sensor at $22^{\circ}C$ or more. Simultaneous measurement of concentration, liquid-level and temperature of the urea tank will be possible by attaching the electrical conductivity sensor and the ultrasonic sensor (split-type) to one sensor together.

초음파 센서 기반 통학 차량에 남겨진 유아 감지 및 경고 시스템 설계에 관한 연구 (Detecting the Remaining Kids in a School Bus and Designing a Warning System based on an Ultrasonic Sensor)

  • 김정재;문태은;박훈민;김정민
    • 한국기계가공학회지
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    • 제17권2호
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    • pp.15-21
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    • 2018
  • In this paper, a detection and warning system is proposed for the remaining kids in a school bus. For detecting the remaining kids, an ultrasonic sensor is used. The basic experiments of the ultrasonic sensor are performed, and a modified ultrasonic sensor is proposed. Also, the appropriate location of the ultrasonic sensor is proposed by considering various sitting positions. Based on the above kid detection system, a warning algorithm is designed. Using the above detection and warning system, experiments are performed. From the experimental results, it is found that the proposed system, based on the modified ultrasonic sensor, can detect the remaining kids in a school bus. The proposed system can also give an appropriate warning signal.

다중 코드 초음파와 전파 신호 강도를 이용한 거리 측정 (A Distance Estimation Algorithm Based on Multi-Code Ultrasonic Sensor and Received Signal Strength)

  • 조봉수;김필수;문우성;백광렬
    • 제어로봇시스템학회논문지
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    • 제17권2호
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    • pp.149-156
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    • 2011
  • This paper reveals a distance estimation algorithm based on multi-code ultrasonic and wireless sensor network. For measuring the distances among the sensor nodes, each ultrasonic transmitter transmits multi-code ultrasonic signal simultaneously. Receivers use cross correlation method to separate the coded signals. The information of measured distances is broadcasted to each sensor node by wireless sensor network. The wireless sensor network measures the distance among the sensor nodes using the received signal strength of the broadcasting. The multi-code ultrasonic have a limitation of measurable distance. And the received signal strength is affected from an environment. This paper measures a distance using ultrasonic and a received signal strength in short range. These measured data are applied to the least square estimation algorithm. By the expansion of the fitting curve, a distance measurement in long range using the received signal strength is compensated. The coupled system reduce the error to an acceptable level.

다공질 압전소자로 제작한 초음파 센서의 물체변위에 무관한 3차원 수중 물체인식 특성 (Characteristics of 3-D Underwater Object Recognition Independent of Translation Using Ultrasonic Sensor Fabricated with Porous Piezoelectric Resonator)

  • 조현철;이기성;박정학;이수호;사공건
    • E2M - 전기 전자와 첨단 소재
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    • 제10권9호
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    • pp.916-921
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    • 1997
  • In this study Characteristics of 3-D underwater object recognition independent of translation using the self-made ultrasonic sensor fabricated with porous piezoelectric resonator and presented. The sensor was satisfied with requirement of ultrasonic sensor. The recognition rates for the training data and the testing data are 97.45 and 91.25[%] respectively using the self-made ultrasonic sensor and SCL(Simple Competitive Learning) neural network. According to the experimental results It is believed that the self-made ultrasonic sensor can be applied as sensor of SONAR system.

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효과적인 빔 폭 중첩을 이용한 고성능 장애물 탐지용 중첩 초음파 센서 링의 최적 설계 (Optimal Design of Overlapped Ultrasonic Sensor Ring for High Performance Obstacle Detection Using Effective Beam Overlap)

  • 김성복;김현빈
    • 융합신호처리학회논문지
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    • 제12권1호
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    • pp.67-75
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    • 2011
  • 본 논문에서는 인접 초음파 센서간 효과적인 빔 폭 중첩을 이용하여 고성능 장애물 탐지를 위한 중첩 초음파 센서 링을 최적 설계하는 방법에 대해 체계적으로 기술하도록 한다. 기본적으로 일군의 동종 저지향성 초음파 센서들이 일정 간격으로 상호 빔 폭이 중첩되도록 원형 배치된다고 가정한다. 첫째 초음파 센서의 실제와 단순화된 빔 패턴 그리고 빔 폭 내의 장애물 위치 추정을 위한 여러 센서 모델에 대해 소개한다. 둘째, 중첩 초음파 센서 링의 장애물 탐지 범위와 장애물 위치 추정을 위한 간단한 센서 모델에 대해 기술한다. 셋째, 타원과 비타원 형태의 빔 패턴에 대해 각각, 장애물 탐지 시 위치 불확실성이 최소화되도록 중첩 초음파 센서 링을 설계하기 위한 지수를 정의한다. 넷째, 최소한의 빔 폭 중첩 보장과 과도한 빔 폭 중첩 회피를 위해 요구되는 중첩 초음파 센서 링의 구조적 사양에 대한 제한 조건을 유도한다. 다섯째, 주어진 중첩 초음파 센서 링의 반경에 대한 초음파 센서의 최적 사용 개수와 주어진 초음파 센서의 사용 개수에 대한 중첩 초음파 센서 링의 최적 반경을 결정한다. 본 논문 전반에 걸쳐, 대표적인 상용 저지향성 초음파 센서로서 Murata사의 MA40B8이 채택되었다.

Development of Safety Sensor for Vehicle-Type Forest Machine in Forest Road

  • Ki-Duck Kim;Hyun-Seung Lee;Gyun-Hyung Kim;Boem-Soo Shin
    • Journal of Forest and Environmental Science
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    • 제39권4호
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    • pp.254-260
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    • 2023
  • A sensor system has been developed that uses an ultrasonic sensor to detect the downhill slope on the side of a forest road and prevents a vehicle-type forest machine from rolling down a mountainside. A specular reflection of ultrasonic wave might cause severe issues in measuring distances to targets. By investigating the installation angle of the sensor to minimize the negative effects of specular reflection, the installation angle of lateral monitoring ultrasonic sensor could be determined based on the width of road shoulder. Obstacles such as small rocks or piece of log in a forest road may cause the forest machine to be overturned while the machine riding over due to excessive its posture change. It was determined that the laser sensor could be a part of a sensor system capable of specifying the location and size of small obstacles. Not only this sensor system including ultrasonic and laser sensors can issue a warning of dangerous sections to drivers in forest forwarders currently in use, but also it can be used as a driving safety sensor in autonomous forest machine or remote-control forest machine in the future.