• Title, Summary, Keyword: Laser sensor

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A Method of Obstacle Detection in the Dust Environment for Unmanned Ground Vehicle (먼지 환경의 무인차량 운용을 위한 장애물 탐지 기법)

  • Choe, Tok-Son;Ahn, Seong-Yong;Park, Yong-Woon
    • Journal of the Korea Institute of Military Science and Technology
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    • v.13 no.6
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    • pp.1006-1012
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    • 2010
  • For the autonomous navigation of an unmanned ground vehicle in the rough terrain and combat, the dust environment should necessarily be overcome. Therefore, we propose a robust obstacle detection methodology using laser range sensor and radar. Laser range sensor has a good angle and distance accuracy, however, it has a weakness in the dust environment. On the other hand, radar has not better the angle and distance accuracy than laser range sensor, it has a robustness in the dust environment. Using these characteristics of laser range sensor and radar, we use laser range sensor as a main sensor for normal times and radar as a assist sensor for the dust environment. For fusion of laser range sensor and radar information, the angle and distance data of the laser range sensor and radar are separately transformed to the angle and distance data of virtual range sensor which is located in the center of the vehicle. Through distance comparison of laser range sensor and radar in the same angle, the distance data of a fused virtual range sensor are changed to the distance data of the laser range sensor, if the distance of laser range sensor and radar are similar. In the other case, the distance data of the fused virtual range sensor are changed to the distance data of the radar. The suggested methodology is verified by real experiment.

Development of multi-line laser vision sensor and welding application (멀티 라인 레이저 비전 센서를 이용한 고속 3차원 계측 및 모델링에 관한 연구)

  • 성기은;이세헌
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.169-172
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    • 2002
  • A vision sensor measure range data using laser light source. This sensor generally use patterned laser which shaped single line. But this vision sensor cannot satisfy new trend which feeds foster and more precise processing. The sensor's sampling rate increases as reduced image processing time. However, the sampling rate can not over 30fps, because a camera has mechanical sampling limit. If we use multi line laser pattern, we will measure multi range data in one image. In the case of using same sampling rate camera, number of 2D range data profile in one second is directly proportional to laser line's number. For example, the vision sensor using 5 laser lines can sample 150 profiles per second in best condition.

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High speed seam tracking using multi-line laser vision sensor (멀티 라인 레이저 비전 센서를 이용한 고속 용접선 추적 기술)

  • 성기은;이세헌
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.584-587
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    • 2002
  • A vision sensor measure range data using laser light source. This sensor generally use patterned laser which shaped single line. But this vision sensor cannot satisfy new trend which needs laster and more precise processing. The sensor's sampling rate increases as reduced image processing time. However, the sampling rate can not over 30fps, because a camera has mechanical sampling limit. If we use multi line laser pattern, we will measure multi range data in one image. In the case of using same sampling rate camera, number of 2D range data profile in one second is directly proportional to laser line's number. For example, the vision sensor using 5 laser lines can sample 150 profiles per second in best condition.

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Damage Analysis of CCD Image Sensor Irradiated by Continuous Wave Laser (연속발진 레이저에 의한 CCD 영상센서의 손상 분석)

  • Yoon, Sunghee;Jhang, Kyung-Young;Shin, Wan-Soon
    • Journal of the Korea Institute of Military Science and Technology
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    • v.19 no.6
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    • pp.690-697
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    • 2016
  • EOIS(electro-optical imaging system) is the main target of the laser weapon. Specially, the image sensor will be vulnerable because EOIS focuses the incident laser beam onto the image sensor. Accordingly, the laser-induced damage of the image sensor needs to be identified for the counter-measure against the laser attack. In this study, the laser-induced damage of the CCD image sensor irradiated by the CW(continuous wave) NIR(near infrared) laser was experimentally investigated and mechanisms of those damage occurrences were analyzed. In the experiment, the near infrared CW fiber laser was used as a laser source. As the fluence, which is the product of the irradiance and the irradiation time, increased, the permanent damages such as discoloration and breakdown appeared sequentially. The discoloration occurred when the color filter was damaged and then the breakdown occurred when the photodiode and substrate were damaged. From the experimental results, LIDTs(laser-induced damage thresholds) of damages were roughly determined.

Development and Application of a Profile Measurement Sensor for Remote Laser Welding Robots (원격 레이저 용접 로봇을 위한 형상 측정 센서의 개발과 응용)

  • Kim, Chang-Hyun;Choi, Tae-Yong;Lee, Ju-Jang;Suh, Jeong;Park, Kyoung-Taik;Kang, Hee-Shin
    • Laser Solutions
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    • v.12 no.2
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    • pp.11-16
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    • 2009
  • A new profile measurement sensor was developed for remote laser welding robots. A stripe laser and a vision camera are used in the profile sensor. A simple sensor guided control scheme using the developed sensor is also introduced. The sensor can be used to guide the welding head in the remote welding application, where the working distance reaches to 450mm. In experiments, the profile measurement and the seam tracking were carried out using the developed sensor.

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Algorithm Development of Level Crossing Obstacle Detection using Laser Radar Sensor (레이저레이더 센서를 이용한 철도 건널목 지장물 검지 알고리즘 개발)

  • Kim, Young-June;Baek, Jong-Hyen;Choi, Kyu-Hyung
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.62 no.12
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    • pp.1813-1819
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    • 2013
  • Existing level crossing obstacle detecting system was installed using a laser beam. Level crossing obstacle detecting system using a laser beam that has been a problem in relation to safety and maintainability failure according to weather conditions. We proposed laser radar level crossing obstacle detecting system as a way to overcome problem, and we developed an algorithm for this. Level crossing obstacle detecting system using a laser radar sensor algorithm is robust to external environment and a shadow zone does not exist. Sensor part of the laser radar level crossing obstacle detecting system of these is made up by the image processing unit and laser radar sensor, it operations by receiving train entering information from the control unit. In this paper, we proposed a detecting algorithm with calculation of the size of the laser radar sensor. Based on this, we were performance test on the basis of the scenario by making a prototype. In the future, laser radar level crossing obstacle detecting system to ensure the safety and reliability through the field test.

Development of a Sensor Calibration to Enhance the Performance of a Non-contact Laser Optical Sensor Unit (비접촉 레이저 광센서의 성능 향상을 위한 센서보정에 관한 연구)

  • Seo, Pyeong-Won;Ryu, Young-Kee;Oh, Choon-Suk;Byun, Jong-Hwan
    • Proceedings of the KIEE Conference
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    • pp.579-581
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    • 2006
  • Flat panel image display devices such as TFT LCD and PDP have required more large area and high quality control components. To control the qualities of the components, measurements of the flatness of a plate glass has been required. In order to measure the shape of the specular objects, Non-Contact Optical Sensor using Hologram laser unit was proposed. The sensor has a optical system that is composed of a Hologram laser and objective lens. The temperature of the sensor body is controlled by TEC(Thermoelectric Cooler) to maintain the same wavelength of the diode laser. In this research, we proposed the calibration scheme to make sensor real time measuring sensor. From the experimental results we see that the proposed sensor unit can measure the position of the glass surface in rial time.

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High speed seam tracking system using vision sensor with multi-line laser (다중 레이저 선을 이용한 비전 센서를 통한 고속 용접선 추적 시스템)

  • 성기은;이세헌
    • Proceedings of the KWS Conference
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    • pp.49-52
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    • 2002
  • A vision sensor measure range data using laser light source, This sensor generally use patterned laser which shaped single line. But this vision sensor cannot satisfy new trend which needs faster and more precise processing. The sensor's sampling rate increases as reduced image processing time. However, the sampling rate can not over 30fps, because a camera has mechanical sampling limit. If we use multi line laser pattern, we will measure multi range data in one image. In the case of using same sampling rate camera, number of 2D range data profile in one second is directly proportional to laser line's number. For example, the vision sensor using 5 laser lines can sample 150 profiles per second in best condition.

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Application of DFB Diode Laser Sensor to Reacting Flow (I) - Estimation and Application to Laminar Flames -

  • Park, Gyung-Min;Masashi Katsuki;Kim, Duck-Jool
    • Journal of Mechanical Science and Technology
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    • v.16 no.11
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    • pp.1550-1557
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    • 2002
  • Diode laser sensor for measuring gas temperature and species concentration in combustion chamber was developed using 2.0 tim distributed feed back lasers. To evaluate the measurement sensitivity of diode laser sensor system, CO2 survey spectra near 2.0 Um were measured and compared with the calculated one. This diode laser absorption sensor was applied to measure gas temperatures in a premixed flat flame of CH$_4$-air mixture. Experimental results were in good agreement with the values by an R-type thermocouple within 6.12%. In addition, successful demonstration of measurement of gas temperature and species concentration in a soot flame showed the promising possibility of diode laser absorption sensors for practical combustion system with non-intrusive method.

Autonomous Robot Kinematic Calibration using a Laser-Vision Sensor (레이저-비전 센서를 이용한 Autonomous Robot Kinematic Calibration)

  • Jeong, Jeong-Woo;Kang, Hee-Jun
    • Journal of the Korean Society for Precision Engineering
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    • v.16 no.2
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    • pp.176-182
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    • 1999
  • This paper presents a new autonomous kinematic calibration technique by using a laser-vision sensor called "Perceptron TriCam Contour". Because the sensor measures by capturing the image of a projected laser line on the surface of the object, we set up a long, straight line of a very fine string inside the robot workspace, and then allow the sensor mounted on a robot to measure the point intersection of the line of string and the projected laser line. The point data collected by changing robot configuration and sensor measuring are constrained to on a single straght line such that the closed-loop calibration method can be applied. The obtained calibration method is simple and accurate and also suitable for on-site calibration in an industrial environment. The method is implemented using Hyundai VORG-35 for its effectiveness.

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