The Review of Laser Engineering
Online ISSN : 1349-6603
Print ISSN : 0387-0200
ISSN-L : 0387-0200
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Volume 29, Issue 6
Displaying 1-9 of 9 articles from this issue
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  • The Annual Meeting and Cavalleria Rusticana
    Reiji SANO
    2001 Volume 29 Issue 6 Pages 345-346
    Published: June 15, 2001
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.29.345
    JOURNAL FREE ACCESS
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  • Preface to the Topical Papers on Laser Applications on Transportation
    Takao KOBAYASHI
    2001 Volume 29 Issue 6 Pages 347
    Published: June 15, 2001
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.29.347
    JOURNAL FREE ACCESS
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  • Development of Laser Range-Imaging Vehicle Sensor
    Shiro OGATA, Tatsuo OGAKI
    2001 Volume 29 Issue 6 Pages 348-352
    Published: June 15, 2001
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.29.348
    JOURNAL FREE ACCESS
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    Laser range finder technology-based three-dimensional vehicle profile and size measurements are useful for vehicle detection and classification in electronic toll collection (ETC). First this paper briefly makes a comparative study of conventional vehicle detectors employing range measurement technologies to summarize the requirements for vehicle classification in ETC. Secondly two overseas laser range vehicle profilers are presented as typical examples of the ETC application. Newly developed laser range finder to classify vehicles for domestic ETC is also introduced. The developed sensor successfully acquired the shapes of vehicles in detail and measure the both of height and width of them with sufficient accuracies for toll collection at actual tollgate.
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  • [title in Japanese]
    2001 Volume 29 Issue 6 Pages 352
    Published: June 15, 2001
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.29.352
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  • Developments of Fiber Optic Gyros
    Kazuo HOTATE
    2001 Volume 29 Issue 6 Pages 353-358
    Published: June 15, 2001
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.29.353
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    Fiber Optic Gyro (FOG) is an inertial rotation sensor, having a high sensitivity around the earth revolution rate with respect to the sun. Among several configurations of FOGs, Interferometer FOG, which consists of a long length sensing-fiber-coil and interferometric detection scheme, has already been developed well, and created practical applications. Navigation unit in the newest aircraft, Boeing 777, includes 4 I-FOGs.Japanese scientific rockets, M-V and TR-1A, have successfully been launched using navigation equipments with I-FOGs. Ship applications of I-FOG have also been investigated. Beside the traditional applications ofthe gyros, FOGs have additionally created consumer applications, such as car navigation, antenna/camera stabilizer and control/ navigation of radio-controlled helicopters. These new applications could be realized, because of the features of I-FOGs, such as maintenance free and short warm-up time.
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  • Development of an Optical Vehicle Classifiable Sensor for ITS
    Toshiki KAWASE, Yutaka MORIKAWA
    2001 Volume 29 Issue 6 Pages 359-363
    Published: June 15, 2001
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.29.359
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    Aiming to apply to ITS field, an optical vehicle classifiable sensor was developed, and this sensor is capable of classifying the type of vehicle and measuring vehicle speed. This paper describes not just an operational principle but also a result of field test. This optical vehicle classifiable sensor is comprised of both an overhead typed sensor head and a vehicle classifiable unit. This over-head typed sensor utilizes laser range finding technology applying time-of-flight principle and is capable of measuring both a distance between the sensor and the vehicle surface and a velocity of vehicle utilizing two beams principle. As a result of field test, classifiable ability of 99.2% were realized and velocity accuracy of 1.2km/h (@1σ) was accomplished.
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  • Heli-borne Obstacle Warning Avoidance System Using Tm, Ho: YLF Imaging Laser Radar
    Keiji KOBAYASHI, Kei OTA, Katsuhiko KOMATSU
    2001 Volume 29 Issue 6 Pages 364-370
    Published: June 15, 2001
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.29.364
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    A 2-micron imaging laser radar system using LD pumped Tm, Ho: YLF laser has been fabricated, which can be used for the obstacle warning avoidance function in helicopters to improve their safety duringnavigation. The system performance has been verified based on the range images of electrical power lines against various natural backgrounds. In order to support the verification, detailed return signal intensity measurements have been conducted using a wooden board and electrical power lines of which ranges and angles against the system have been precisely controlled. The system applicability for the function has been confirmed through those quantitative evaluations of the system.
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  • Study of Fiber-Based Doppler Lidar for Airborne Turbulence Sensor
    Kimio ASAKA, Shumpei KAMEYAMA, Toshiyuki ANDO, Takayuki YANAGISAWA, Ya ...
    2001 Volume 29 Issue 6 Pages 371-376
    Published: June 15, 2001
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.29.371
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    We have proposed and studied a fiber-based Doppler lidar for airborne turbulence sensor. A lidar with small size, high reliability, and high flexibility of arrangement could be achieved by combining fiber-based optics, which are commercially available as optical components utilized in optical fiber communicationsystems, and high repetition rate operation with large number signal integration data processing methods toimprove the SN ratio. In the design assuming the measurement distance of 3km and data renewing rate of 1Hz, required output peak powers with transmitted pulse repetition duty cycle of 5% are as low as 1.5 W, 11 W, and 130 W at the airplane altitude of 1 km, 5 km, and 10 km, respectively. In the ground based primary experiment with the output peak power level of 10W, the wind velocity up to the distance of 2.5 km could be measured with SN ratio of more than 8dB at the data renewing rate of as high as 50Hz. The result well coincideswith predicted theoretical value. To our knowledge, this is the first demonstration of fiber based Doppler lidar for long range wind measurement with a high data renewal rate. By developing fiber amplifiers, which output the pulse peak power of about -kW, and effective signal integration data processing methods, this sensor could become useful for airborne turbulence detection with measurement distance up to 10 km and measurementaltitude of 10km.
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  • Fundamentals of Optical Information Processing II
    Toyohiko YATAGAI
    2001 Volume 29 Issue 6 Pages 377-381
    Published: June 15, 2001
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.29.377
    JOURNAL FREE ACCESS
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