• Title/Summary/Keyword: Distance measurement

Search Result 2,351, Processing Time 0.045 seconds

A Study on the Multipurpose Golf Putting Range Finder using IR Razer Sensor and Inertial Sensor (IR 레이저 센서 및 관성 센서를 이용한 다목적 골프 퍼팅 거리 측정기에 대한 연구)

  • Min-Seoung Shin;Dae-Woong Kang;Ki-Deok Kim;Ji-Hwan Kim;Chul-Sun Lee;Yun-Seok Ko
    • The Journal of the Korea institute of electronic communication sciences
    • /
    • v.18 no.4
    • /
    • pp.669-676
    • /
    • 2023
  • In this paper, a multi-purpose golf putting range finder based on an IR razer sensor and an inertial sensor was designed and made. It was designed to measure distance and slope within a 50m outdoor measurement range for the main purpose of golf putting distance measurement, and at the same time, it is designed to measure temperature information that affects putting. In addition, the distance meter supports house maintenance work by providing length and horizontality measurement values within the indoor 80m measurement range, and provides safety from indoor or vehicle fires by providing indoor temperature measurement values to mobile phones through linkage with the web server. In order to evaluate the accuracy of the proposed method and its interworking performance with a smartphone, a prototype was produced and a web server was built, and the usefulness was confirmed by showing an acceptable error rate within 5% in repeated experiments.

Implementation of High-Resolution Laser Distance Measurement System using Phase-Shift Method (위상천이 방법을 이용한 고분해능 레이저 거리측정 시스템 개발)

  • Park, Bee-Jay;Lee, Chung-Woo;Chung, Chung-Choo;Sho, Jae-Hyuk;Ong, Sang-Jin
    • Proceedings of the KIEE Conference
    • /
    • 2004.11c
    • /
    • pp.589-591
    • /
    • 2004
  • In this paper, we developed a laser distance measurement(LDM) system based on DSP. We applied PPD(Pulsed Phase Detection) algorithm to the LDM system. The PPD algorithm calculate the distance from the LDM system to the object by using phase detection. Reference waveform at a fixed frequency is sampled by both the inner-loop and outer-loop pulse signal. The LDM system detects the difference of phase between the sampled signals. We obtained an accuracy of ${\sigma}=25.5mm$ from the LDM system.

  • PDF

A Study on the Distance Measurement Algorithm using Feature-Based Matching for Autonomous Navigation

  • Song, Hyun-Sung;Lee, Ho-Soon;Jeong, Jun-Ik;Son, Kyung-Hee;Rho, Do-Hwan
    • 제어로봇시스템학회:학술대회논문집
    • /
    • 2001.10a
    • /
    • pp.63.2-63
    • /
    • 2001
  • It is necessary to distance measurement to detect about obstacles and front vehicles to autonomously navigate. In this paper, we propose an algorithm using stereo vision. It is as follows this algorithm´s procedure. First, It has detected a front vehicle´s common edges from left and right images by image processing. We select number plate of a front vehicle as edges. Then, we estimate distance by triangle measurement method after stereomatching using corner points of the plate´s edges as feature-based points. Experimental results show errors and values compand with experimental ones after set up distance between vehicles in advance.

  • PDF

A Development of Distance Measurement Scheme for Localization System in Wireless Personal Area Network

  • Lee, Dong-Myung
    • Journal of Engineering Education Research
    • /
    • v.13 no.2
    • /
    • pp.7-11
    • /
    • 2010
  • As the development of the computer and communication technologies, the ubiquitous society can be realized to the world early in the future. Thus, the localization system in Wireless Personal Area Network (WPAN) is required for many users of ubiquitous society to provide the ubiquitous computing based applications in respective of anytime and anywhere. In this paper, we propose the distance measurement scheme that is based on the distance measurement using RSSI (Received Signal Strength Indicator) of sensor module considering of two distance conditions for the localization system using Zigbee in WPAN. Also, the localization errors of the proposed scheme are analyzed in the three scenarios that the mobile module tracks in the in $6m{\times}6m$ scaled experimentation area. In addition to this, the monitoring subsystem is developed using GUI (Graphical User Interface) in order to monitor the location of the moving objects accurately and user-friendly.

  • PDF

A Study on the Improvement of Accuracy of Shape Measurement in the Shadow Moire Method (그림자식 모아레를 이용한 형상측정법의 정확도 개선에 관한 연구)

  • 박경근;박윤창;정경민
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
    • /
    • 1999.05a
    • /
    • pp.175-180
    • /
    • 1999
  • Generally, When we measure of object 3D surfaces with phase shifting shadow moire method, it is use of optical system consist of light source, grating, and ccd camera. At this time, it is important parameter that vertical distance of grating and camera, grating and light source, and horizontal distance of camera and light source. When use camera consist of complex lens vertical distance of grating and camera is unknown parameter. From this cause equivalent wave length of moire fringe is uncertain. In this study, We exactly obtain a vertical distance of grating and camera so improve on measurement accuracy.

  • PDF

GIS-oriented Measurement Indicces of Accessibility of the Neighborhood Park in Seoul (GIS를 활용한 서울시 도시근교공원의 접근성 지표에 관한 연구)

  • 허미선;진양조
    • Journal of the Korean Institute of Landscape Architecture
    • /
    • v.24 no.3
    • /
    • pp.42-56
    • /
    • 1996
  • The citizens seek to maximize convenience, pleasantness and safety when they use urban facilities. However, existing practices of urban neighborhood parks have applied not qualitative standards such as adequacy, efficiency, accessibility, equity, or socioeconomic issues but very limited quantitative standards such as area per person. Therefore it is not rare that citizens have lost their accessibility to near-by neighborhood parks. And park regulations based on the distance of lien are supposed to be uniformally accomplished regardless of the consideration about users or geographical special situations. Futhermore, it has been found that some urban neighborhood parks don't reach to the standards given by the regulations. This study tries to accomplished several purposes. The first purpose is to extract the boundary of real user-accessible zones derived from the city survey. Comparing with boundary of real user-accessible zones, the second one is to propose the most efficient measurement indices among many accessibility measurement index. Based upon the above arguments, the last one is to review the propriety of the access distances(e.g., semidiameter) of an urban neighborhood park in a law. The measurement indices of accessibility examined in this study are walking distance, walking time and walking difficulty. The comparison of visual discrimination, the comparison of area and the comparison of differences of maximum distance showed similar results. Each index can also be compared in the size of area and differences of maximum distance. Walking difficulty with the turning showed the best measurement values among the measurement indices. This indicates that walking difficulty with crossing and/or turning may be another important indices in measuring accessibility, while other existing studues have mainly dealt with walking time and distance as accessibility indices. The results of this study also supported that the existing regulations related to park allocation(e.g., access diameter) are close to the findings of this study.

  • PDF

The Evaluation of Communication Distance Using Wireless MEMS Sensor in Building Structure (건축구조물에서 무선 MEMS 센서를 이용한 통신 거리 유효성 평가)

  • Lee, Jong-Ho;Cheon, Dong-Jin;Yoon, Sung-Won
    • Journal of Korean Association for Spatial Structures
    • /
    • v.17 no.4
    • /
    • pp.93-102
    • /
    • 2017
  • Wireless MEMS sensors have common features such as wireless communication, data measurement, embedded processing, battery-based self-power, and low cost, and increased measurement effectiveness. Wireless MEMS sensors enable efficient SHM without interfering with location because there is no requirement for triboelectric noise and cumbersome cables. However, there is little research on the communication distance with sensors and data. For instance, existing researches have limited communication distance experiments in civil engineering bridges. It is also necessary to investigate the characteristics of dynamic behavior and the communication distance of architectural structures with different wireless transmission/reception environments. Therefore, in a building structure with walls and slabs instead of open spaces, MEMS sensors and data loggers were used as distance experiments where communication disturbance between the vertical slab and the horizontal wall could actually be communicated.

A Study on Effective Source-Skin Distance using Phantom in Electron Beam Therapy

  • Kim, Min-Tae;Lee, Hae-Kag;Heo, Yeong-Cheol;Cho, Jae-Hwan
    • Journal of Magnetics
    • /
    • v.19 no.1
    • /
    • pp.15-19
    • /
    • 2014
  • In this study, for 6-20 MeV electron beam energy occurring in a linear accelerator, the authors attempted to investigate the relation between the effective source-skin distance and the relation between the radiation field and the effective source-skin distance. The equipment used included a 6-20 MeV electron beam from a linear accelerator, and the distance was measured by a ionization chamber targeting the solid phantom. The measurement method for the effective source-skin distance according to the size of the radiation field changes the source-skin distance (100, 105, 110, 115 cm) for the electron beam energy (6, 9, 12, 16, 20 MeV). The effective source-skin distance was measured using the method proposed by Faiz Khan, measuring the dose according to each radiation field ($6{\times}6$, $10{\times}10$, $15{\times}150$, $20{\times}20cm^2$) at the maximum dose depth (1.3, 2.05, 2.7, 2.45, 1.8 cm, respectively) of each energy. In addition, the effective source-skin distance when cut-out blocks ($6{\times}6$, $10{\times}10$, $15{\times}15cm^2$) were used and the effective source-skin distance when they were not used, was measured and compared. The research results showed that the effective source-skin distance was increased according to the increase of the radiation field at the same amount of energy. In addition, the minimum distance was 60.4 cm when the 6 MeV electron beams were used with $6{\times}6$ cut-out blocks and the maximum distance was 87.2 cm when the 6 MeV electron beams were used with $20{\times}20$ cut-out blocks; thus, the largest difference between both of these was 26.8 cm. When comparing the before and after the using the $6{\times}6$ cut-out block, the difference between both was 8.2 cm in 6 MeV electron beam energy and was 2.1 cm in 20 MeV. Thus, the results showed that the difference was reduced according to an increase in the energy. In addition, in the comparative experiments performed by changing the size of the cut-out block at 6 MeV, the results showed that the source-skin distance was 8.2 cm when the size of the cut-out block was $6{\times}6$, 2.5 cm when the size of the cut-out block was $10{\times}10$, and 21.4 cm when the size of the cut-out block $15{\times}15$. In conclusion, it is recommended that the actual measurement is used for each energy and radiation field in the clinical dose measurement and for the measurement of the effective source-skin distance using cut-out blocks.

A Development of Displacement Measurement System using Ultrasonic Sensor (초음파 센서를 이용한 변위 측정 시스템 개발)

  • Kim, Jung-Sup;Kim, Sang-Hee
    • Proceedings of the KIEE Conference
    • /
    • 1995.11a
    • /
    • pp.142-145
    • /
    • 1995
  • This paper is to develop a measurement system of the displacement distance using ultrasonic sensors. Two 400KHz ultrasonic sensors are used for realizing the measurement system, such as one sensor transmits the sine wave and the other sensor receives this wave. The displacement is measured by the phase difference between transmitting and receiving signals. A phase defecter transforms phase difference to voltage. Because the output voltage pattern has nonlinear characteristics, the relations of the voltage and the distance are learned by a neural network. As the results of teaming, the efficiency of measurement system is improved. This system can measure the displacement distance at the accuracy of 1 micrometer level.

  • PDF

Measurement System of a Distance from Lightning Strokes to Observatory and Spectrum Analysis of Electric Fields Radiated from Lightning Discharges (뇌격거리측정계 및 뇌방전에 의해 발생하는 전장의 스펙트럼 분석)

  • Lee, B.H.;Chang, S.H.;Jeang, K.H.;Jeon, D.K.
    • Proceedings of the KIEE Conference
    • /
    • 1998.07e
    • /
    • pp.1656-1658
    • /
    • 1998
  • This paper deals with a measurement system of a distance between lightning strokes and observatory station and spectrum analysis of electric fields radiated from lightning discharges. The distance measurement system, which consists of a loop type magnetic field sensor, a microphone and one chip microprocessor, is connected to a personal computer through RS232 port to acquire and process the data. This system is to use a difference of propagation velocity between an electromagnetic wave and a sonic wave produced by lightning discharge. Also, an electric field waveform and a frequency spectrum were investigated by an electric field measurement system with a hemisphere antenna and a spectrum analyzer with a biconical antenna and a log-periodic antenna, respectively. The results would be used as a basic reference to protect the power systems and electric circuits from lightning overvoltages.

  • PDF