• 제목/요약/키워드: Distance Measuring Sensor

검색결과 169건 처리시간 0.025초

선형화 전압-거리 변환함수를 이용한 PSD 센서기반 거리계측시스템의 개발 (Development of PSD Sensor Based Distance Measuring System Using Linearizing Function of Voltage-Distance Conversion)

  • 김유찬;유영재
    • 한국지능시스템학회논문지
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    • 제15권6호
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    • pp.668-672
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    • 2005
  • 본 논문에서는 이동로봇의 저가형 위치인식센서로 적합한 PSD(Position Sensitive Detector)센서를 이용하여 거리계측시스템을 개발하였다. PSD 센서는 거리-전압 출력이 비선형적인 단점을 가지고 있어 센서의 특성실험을 통해 선형화가 가능한 변환함수를 제안하였다. 제안한 방법을 검증하기 위하여 거리계측시스템의 하드웨어 및 소프트웨어를 구성하였다 또 피측정체의 색상 및 재질에 따른 출력특성을 실험하고 거리-전압 데이터를 측정하였다. 실측한 데이터를 바탕으로 제안한 선형화함수의 계수를 추출하였다. 마지막으로 제안한 함수에 의한 거리와 실제거리를 비교하여 시스템의 성능 및 정확성을 검증하였다.

Measurement of 3D Spreader Position Information using the CCD Cameras and a Laser Distance Measuring Unit

  • Lee, Jung-Jae;Nam, Gi-Gun;Lee, Bong-Ki;Lee, Jang-Myung
    • 한국항해항만학회지
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    • 제28권4호
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    • pp.323-331
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    • 2004
  • This paper introduces a novel approach that can provide the three dimensional information about the movement of a spreader by using two CCD cameras and a laser distance measuring unit in order to derive ALS (Automatic Landing System) in the crane used at a harbor. So far a kind of 2D Laser scanner sensor or laser distance measuring units are used as comer detectors for the geometrical matching between the spreader and a container. Such systems provide only two dimensional information which is not enough for an accurate and fast ALS. In addition to this deficiency in performance, the price of the system is too high to adapt to the ALS. Therefore, to overcome these defects, we proposed a novel method to acquire the three dimensional spreader information using two CCD cameras and a laser distance measuring unit. To show the efficiency of proposed method, real experiments are performed to show the improvement of accuracy in distance measurement by fusing the sensory information of the CCD cameras and a laser distance measuring unit.

3D Spreader Position Information by the CCD Cameras and the Laser Distance Measuring Unit for ATC

  • Bae, Dong-Suk;Lee, Jung-Jae;Lee, Bong-Ki;Lee, Jang-Myung
    • 제어로봇시스템학회:학술대회논문집
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    • 제어로봇시스템학회 2004년도 ICCAS
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    • pp.1679-1684
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    • 2004
  • This paper introduces a novel approach that can provide the three dimensional information on the movement of a spreader by using two CCD cameras and a laser distance sensor, which enables an ALS (Automatic Landing System) to be used for yard cranes at a harbor. So far a kind of 2D Laser scanner sensor or laser distance measuring units are used as corner detectors for the geometrical matching between the spreader and a container, which provides only 2D information which is not enough for an accurate and fast ALS system required presently. In addition to this deficiency in performance, the price for the system is too high to be adopted widely for the ALS. Therefore, to overcome these defects, a novel method to acquire the three dimensional information for the movement of a spreader including skew and sway angles is proposed using two CCD cameras and a laser distance sensor. To show the efficiency of proposed algorithm, real experiments are performed to show the accuracy improvement in distance measurement by fusing the sensory information of CCD camera and laser distance sensor.

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공중 초음파 센서를 응용한 거리 형상인식에 관한 연구 (A Study on the Distance and Object Recognition Applying the Airborne Ultrasonic Sensor)

  • 한응교;박익근
    • 비파괴검사학회지
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    • 제10권1호
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    • pp.10-17
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    • 1990
  • Recently, object recognition ultrasonic sensor is being used with automatization of industrial machine. Points which characterize the object can be deleted by measuring the propagation time of ultrasonic impulse and azimuth which gives its maximum amplitude, and from these points shape, position and orientation of the object are deduced. A new measuring method is adopted, where the distance to the object is calculated by sound reflection time which is measured from O-cross point of sound wave, and azimuth is measured by angle indicating maximum amplitude. The measuring accuracy of 1.0mm for distance and $0.5-2^{\circ}$ for azimuth have been accomplished. By rotational scanning of sensor the characteristic point of an object can be known and it gives the information of its shape, position and orientation. Experimental results showed that the object of some complicated shape can be recognized, which suggest its applicability to robot.

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자기 변형 기술을 이용한 액체 밀도 측정의 보정 기술 (Calibration Technique of Liquid Density Measurement using Magnetostriction Technology)

  • 서무교;홍영호;최인섭
    • 전자공학회논문지
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    • 제51권8호
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    • pp.178-184
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    • 2014
  • 자기 변형 기술의 거리 측정을 응용하여, 중력과 액체 밀도에 대응하는 부력의 평형 위치를 측정하는 액체 밀도 센서를 개발하였다. 이 시스템의 정밀도 향상을 위해, 액체 밀도변화에 따른 밀도 센서의 이동거리 사이의 관계식을 유도하고, 이를 이용하여, 액체 밀도 센서의 2 점 보정 방법을 마련하였다. 제작된 액체 밀도 센서 시스템과 유도된 관계식을 사용하여 액체의 밀도들을 측정하였다. 측정된 결과들을 U-tube 진동주기 측정방식의 고 정밀 밀도 측정기(Oscillating U-tube density meter: 분해능 0.000001 g/cc)의 측정결과와 비교하였다. 그 결과 두 액체 밀도 측정 시스템간의 측정 편차가 0.001 g/cc 미만임을 확인하였다.

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.

Capturing Distance Parameters Using a Laser Sensor in a Stereoscopic 3D Camera Rig System

  • Chung, Wan-Young;Ilham, Julian;Kim, Jong-Jin
    • 센서학회지
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    • 제22권6호
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    • pp.387-392
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    • 2013
  • Camera rigs for shooting 3D video are classified as manual, motorized, or fully automatic. Even in an automatic camera rig, the process of Stereoscopic 3D (S3D) video capture is very complex and time-consuming. One of the key time-consuming operations is capturing the distance parameters, which are near distance, far distance, and convergence distance. Traditionally these distances are measured by tape measure or triangular indirect measurement methods. These two methods consume a long time for every scene in shot. In our study, a compact laser distance sensing system with long range distance sensitivity is developed. The system is small enough to be installed on top of a camera and the measuring accuracy is within 2% even at a range of 50 m. The shooting time of an automatic camera rig equipped with the laser distance sensing system can be reduced significantly to less than a minute.

젖소의 자동 체온 측정 시스템 개발 (Development of an Automatic Body Temperature Measuring System for Dairy Cattle)

  • 정길도;김형주;김용준;한병성;김명순
    • 한국임상수의학회지
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    • 제13권2호
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    • pp.140-143
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    • 1996
  • In this paper the development of an automatic body temperature measuring system which can be attached to the milking machine has been studied. Since the disease is highly related to the body temperature of the cattle, early detection of the abnormal temperature would prevent the severe problems which may occur in dairy farms. The electronic component AD590 is used as a temperature sensor for the system. The device is highly robust against the noise since the output signal is the current. So it can be applied to the long distance sensing. The resolution of the signal is $0.1{\circ}C$ and the current is 10 mV. Also the A/D converter is designed for interfacing the sensor with a computer. A temperature measuring experiment using the developed system has been done for measuring the temperature of human beings and the system was proven to be useful for measuring the body temperature of the dairy cattle properly.

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감성 조명장치의 소모 전력 절감을 위한 거리 측정 센서 기반 자동 조광 제어 (Automated Brightness Control Using Distance Measuring Sensor for Reducing the Power Consumption of Emotional Lighting)

  • 신성훈;지상훈;정구민;이영대;배성한
    • 한국인터넷방송통신학회논문지
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    • 제11권6호
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    • pp.247-253
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    • 2011
  • 본 논문에서는 감성조명의 소모전력 절감을 위한 거리 측정 센서 기반 자동 조광 제어 시스템을 제안하고 구현한다. 지속적인 색상변화를 표현해야 하는 감성 조명에서의 소비 전력 절감을 위하여 초음파 센서를 이용한 사용자와의 지속적인 거리 측정 및 이를 통한 PWM Dimming 제어를 수행한다. 조명장치는 마이크로 컨트롤러, LED Driver, 초음파 센서, 통신모듈 등으로 구성되며, 초음파 센서를 통해 측정된 거리 정보를 PWM 신호에 적용하여 실시간 밝기 제어를 수행한다. 기존 조명에서의 에너지 절감 기법을 감성조명에 적용하여 사용자 부재 시 불필요한 전력 소모를 최소화하는 능동형 조명 시스템을 구현한다.