• Proceedings of the Korea Institute of Convergence Signal Processing
• /
• 2001.06a
• /
• pp.85-88
• /
• 2001

레이저 거리측정기는 레이저를 이용한 거리측정 방법으로 레이저송수신펄스의 시간차로부터 거리를 측정하는 방법이다. 본 연구에서는 송광부, 수광부, 제어모듈 통의 하드웨어로 시스템을 구성하고, 거리측정의 오차를 보정 알고리즘을 사용하여 거리를 계측하는 80196 기반의 거리측정기를 개발하였다.

• Proceedings of the Korean Society of Precision Engineering Conference
• /
• 2004.05a
• /
• pp.180-180
• /
• 2004

정밀한 계측의 필요성이 높아지면서 레이저는 그 신뢰성과 사용 편의성으로 인해 거리측정에도 높은 활용을 보이고 있다. 레이저 거리측정기(laser range finder, LRF)의 원리는 20ns 미만의 짧은 레이저 펄스를 표적에 발사한 후 반사되어 돌아오는 신호의 시간과 빛의 속도를 곱하여 거리를 계산하는 방식이다. 이러한 반사펄스(pulse-echo techniques)법은 수m-수백만 km까지의 거리측정에 사용되는 방식으로서 정밀하고 빠른 측정이 가능할 뿐 아니라 단지 목표물을 확인하고 측정버튼을 누름으로써 결과를 얻을 수 있는 사용 편의성을 장점으로 한다.(중략)

• Journal of the Korean Institute of Intelligent Systems
• /
• v.24 no.2
• /
• pp.111-116
• /
• 2014

Using only laser range finder to detect the obstacles in an environment that contains transparent obstacles can not guarantee autonomous mobile robot from collision problem. To solve this problem, a mobile robot using laser range finder must be used additional sensor device such as sonar sensor that can detect the transparent obstacle. In this paper, a method is addressed to deal with the problem to detect the transparent obstacles within environment only by using laser range finder for mobile robot. In case the recognized transparent obstacle, the proposed algorithm is to localize the transparent obstacle to extract and process the reflected noise. This algorithm ensures autonomous of mobile robot only using laser range finder. The effectiveness of the proposed algorithm is evaluated by the real mobile robot and real laser range finder experiments with three case studies.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.12 no.7
• /
• pp.3214-3219
• /
• 2011

Nowadays, we live in the age of highly developed information technology. The information industry is growing rapidly and it is making remarkable changes in our life. Among the information technologies, laser range finder can be used to measure distance in difficult environment. In this paper, we have designed and constructed the laser range finder for many purposes such as industry or leisure in difficult environment. Using the proposed laser range finder enables us to measure distance easily using timing discriminator between transmitter and receiver for industry or leisure.

• Journal of the Korea Institute of Military Science and Technology
• /
• v.10 no.4
• /
• pp.152-159
• /
• 2007

In this paper, a new design technique on the LRF which is useful for low power laser and a CBDA(Cummulative Binary Detection Algorithm) is proposed. The LD(Laser Diode) and Si-APD(Silicon Avalanche Photo Diode) are used for saving a power. In order to prove the detection range, the Si-APD binary data are accumulated before the range computation and the range finding algorithm. A prototype of the proposed DLRF(Diode Laser Range Finder) system was made and tested. An experimental result shows that the DLRF system have the same detection range using a less power(almost 1/32) than an usual military LRF. The proposed DLRF can be applied to the Unmanned Vehicles, Robot and Future Combat System of a tiny size and a low power LRF.

• 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.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.38C no.4
• /
• pp.351-358
• /
• 2013

We propose a correction method of nonlinear frequency sweep in an FMCW(Frequency Modulated Continuous Wave) laser range finder. FMCW laser range finder requires linear frequency sweep for high resolution, and nonlinear frequency sweep makes the system performance degrade. In general, VCO(Voltage Controlled Oscillator) which is a component used for frequency modulation in FMCW method has nonlinear property. To correct the nonlinear frequency sweep, we utilize an auxiliary delay structure for generating trigger signal of ADC(Analog to Digital Converter). Because the trigger signal has same rate of change with the beat signal, the nonlinearity of the beat signal can be corrected. the experimental results show that the proposed method effectively eliminates the nonlinear frequency sweep problem and enhances the system performance.

• Proceedings of the Korean Society of Precision Engineering Conference
• /
• 2003.10a
• /
• pp.133-133
• /
• 2003

• Korean Journal of Optics and Photonics
• /
• v.6 no.1
• /
• pp.56-61
• /
• 1995

본 연구에서는 펄스형 고반복 Nd:YAG 레이저를 이용한 거리측정기의 설계 및 그에 따른 제작 성능을 기술하고자 한다. 제작 결과로 얻어진 측정 최대거리는 지상표적에 대하여 약 19km이다. 이 때 대기의 시정거리는 약 23km이다.

• Journal of the Institute of Electronics and Information Engineers
• /
• v.49 no.9
• /
• pp.307-313
• /
• 2012

This paper proposes a hand-eye laser range finder (LRF) based welding plane recognition method for autonomous robotic welding. The robot welding is the process of joining a metal piece and the welding plane along the welding path predefined by the shape of the metal piece. Thus, for successful robotic welding, the position and direction of the welding plane should be exactly detected. If the detected position and direction of the plane is not accurate, the autonomous robotic welding should fail. For precise recognition of the welding plane, a line on the plane is detected by the LRF. For obtaining the line on the plane, the Hough transform is applied to the obtained data from the LRF. Since the Hough transform is based on the voting method, the sensor noise can be reduced. Two lines on the plane are obtained before and after rotation of the robot joint, and then the direction of the plane is calculated by the cross product of two direction vectors of two lines. For verifying the feasibility of the proposed method, the simulation with the robot simulator, RoboticsLab developed by Simlab Co. Ltd., is carried out.