The Review of Laser Engineering
Online ISSN : 1349-6603
Print ISSN : 0387-0200
ISSN-L : 0387-0200
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Volume 29, Issue 3
Displaying 1-14 of 14 articles from this issue
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  • Colorful Dreams on Laser to High School Students
    Masataka MURAHARA
    2001 Volume 29 Issue 3 Pages 135
    Published: March 15, 2001
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.29.135
    JOURNAL FREE ACCESS
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  • Preface for Topical Papers on Applications of Laser Spectroscopy to Environmental Monitoring
    Tatsuo OKADA
    2001 Volume 29 Issue 3 Pages 136
    Published: March 15, 2001
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.29.136
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  • Diagnostics of Combustion Using Laser Spectroscopy
    Masahide TSUJISHITA, Akeshi KEGASA, Takashi WAKABAYASHI, Masakazu YOKO ...
    2001 Volume 29 Issue 3 Pages 137-141
    Published: March 15, 2001
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.29.137
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    To develop a high-performance combustor, diagnostics on combustion field is essential. Severalmeasurement methods based on laser techniques have been proposed, such as Laser Doppler Velocimetry (LDV) and Laserinduced Fluorescence (LIF). According to the advancement of the laser technology, these diagnostic techniques can be operated without difficulty and we have taken in and developed these techniques.They have been applied for investigation of problems of practical combustors, and for clarification of kinetic calculation of flames. In this paper, several examples of application of laser diagnostics on combustion and flow field in our works were introduced.
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  • A Portable Remote Gas-Leak Detector Using Laser Spectroscopy
    Takaya ISEKI, Hideo TAI
    2001 Volume 29 Issue 3 Pages 142-146
    Published: March 15, 2001
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.29.142
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    A portable remote gas-leak detector using a 1.65μm InGaAsP DFB laser is developed. It is designed as a manportable long-path absorption methane lidar using a topographical target with a distance of several meters. An operator can search for gas leaks by hand scanning of the laser light. High sensitivity is accomplished by means of second-harmonic detection using wavelength-modulation spectroscopy. The experimental methane detection limit with a diffusive target of magnesium oxide (distance: 8 m, incidence: 60 deg) is 2.2 ppm·m with a time constant of 0.1 s. Measurement with a realistic target shows that the detector can findsmall gas leaks of 10 ml/min within the distance of several meters.
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  • [title in Japanese]
    2001 Volume 29 Issue 3 Pages 146-146,152
    Published: March 15, 2001
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.29.146
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  • Remote Sensing of Atmospheric Environment by Means of Laser Spectroscopy
    Mitsuo MAEDA
    2001 Volume 29 Issue 3 Pages 147-152
    Published: March 15, 2001
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.29.147
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    Detection of atoms and molecules using laser spectroscopy is substantially an active sensing method, and can be applied for the detection of minor contents of the atmosphere. This report reviews remote sensing of atmospheric gas constituents using various kinds of laser spectroscopic techniques, such as absorption, fluorescence and Raman spectroscopy. The spatial distribution of a specific constituent can be determined using the laser radar (lidar) technique. The long-path absorption method or differential absorption lidar (DIAL) is the most useful technique to measure various kinds of molecules related to the global environmental problems, such as ozone, H2O, SO2, NO2, and many other molecules with their absorption bands in the infrared region. Application of nonlinear Raman spectroscopy to the remote sensing of atmospheric constituents is briefly discussed.
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  • Selective Detection of Trace Dioxins Based on Laser Spectroscopic Techniques
    Shigeru YAMAGUCHI, Minako SHINOZAKI, Kenzo NANRI, Tomoo FUJIOKA
    2001 Volume 29 Issue 3 Pages 153-159
    Published: March 15, 2001
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.29.153
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    This paper reports the present status of laser diagnostics for trace dioxin detection . Opticalproperties such as infra-red (IR) absorption spectrum, ultra-violet (UV) pump frequencies, ionization potential of typical dioxins and their pre-cursors as well as their generation process in an incinerator are reviewed. Candidates of available laser sources both in UV and IR realizing the trace detection system are briefly discussed taking account such optical data-base. Recent research activities for ultra-trace (-pptv) dioxins and their derivatives detection using laser sources focused on Resonance Enhanced Multi Photon Ionization with Time of Flight Mass Spectrometry (REMPI-TOFMS) method are also described.
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  • High Sensitivity Analysis of Dioxin Precursors by Laser Ionization Time-of-Flight Mass Spectroscopy
    Masahide TSUJISHITA, Akeshi KEGASA, Kei FURUTA, Masakazu YOKOO
    2001 Volume 29 Issue 3 Pages 160-163
    Published: March 15, 2001
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.29.160
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    Recently, a method of analyzing dioxin concentration with high sensitivity is desired. Laser ionization timeof-flight mass spectroscopy (LI TOF-MS) has been developed to satisfy this need. In this study, the detection sensitivity of a few ppt for chlorobenzene, which is a precursor of dioxin, was realized by adjusting the laser beam, the molecular jet and other conditions of the LI TOF-MS system. This sensitivity is 300 times higher than that of gas chromatography mass spectroscopy (GC-MS). Furthermore, selective detection ofthe isomers of dichlorobenzene was performed by making use of the difference of ionization wavelength. LI TOF-MS is expected to be an on-line monitor analyzer of dioxin concentration in exhaust gas by detectingthe precursors of dioxin.
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  • Trace Element Detection Using Laser Diagnostics
    Matsuhei NODA, Yoshihiro DEGUCHI, Shinsaku DOBASHI, Kozo YOSHIKAWA, Se ...
    2001 Volume 29 Issue 3 Pages 164-168
    Published: March 15, 2001
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.29.164
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    This study demonstrates trace element measurement using laser diagnostics. A LIBS technique has been applied to detect alkali metals under high-pressure and high-temperature conditions, and an automated LIBS unit has been developed and applied in a month-long monitoring experiment. The results were compared to those obtained using the conventional sampling method, and good agreement was found. LIBS can detect Na and K at ppb levels, even under the high-pressure conditions of PFBC and IGCC thermal power plants. LIBS is capable of a 1-minute detection time, as opposed to the 20-hour sampling time required by the conventional method, and offers various advantages as a tool for actual plant monitoring.
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  • Thickness Measurement of Thin Metal Plates by Laser-Induced Thermal Elastic Wave
    Tetsuya TANIYAMA, Daigo TAKANO
    2001 Volume 29 Issue 3 Pages 169-173
    Published: March 15, 2001
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.29.169
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    This paper describes a method for measuring the thickness of a metal plate by making use of thermal elastic waves induced by intermittent irradiation of a CO2, laser beam with power density of 5×109 W/m2. Experiments are carried out for five kinds of metal samples including aluminum and copper with a thickness range between 0.1×10-3 and 2×10-3 m. The following results are obtained: (1) The modulation frequency which makes phase angle of the thermal elastic wave zero degree is reciprocally proportional to square of the thickness. (2) The modulation frequency is determined by thermal diffusibility of each metal. (3) The product of optical absorption coefficient multiplied by sample of thickness is 1.57. On the basis of these results, a method for obtaining optical absorption coefficient is also discussed.
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  • Polarization Control for Precise Optical Tracking
    Masahiro TOYODA, Kenichi ARAKI, Yoshiaki SUZUKI
    2001 Volume 29 Issue 3 Pages 174-179
    Published: March 15, 2001
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.29.174
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    A method for reducing the influence of background light in an optical tracking system is described. In a ground-to-geostationary-satellite laser link, an increase in the shot noise current for solar background radiation is slight, but the dispersion of this background light causes errors in the cells of the tracking receiver. The new method suppresses this effect by rotating the polarization of the received laser beam. The frequency bandwidth of the optical tracking is increased by using two half-wave plates to speed up the polarization rotation.
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  • Bending of Shock Wave Plasma Induced by Q-Switched Nd: YAG Laser at Low Pressures
    Wahyu SETIABUDI, Abdul RAHMAN, Hendrik KURNIAWAN, May On TJIA, Kiichir ...
    2001 Volume 29 Issue 3 Pages 180-183
    Published: March 15, 2001
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.29.180
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    A Q-switched Nd: YAG laser (8 ns, 53 mJ) was focused on copper near the edge of the target at 2Torr air pressure in order to observe bending in the laser plasma. It was shown that the bending of thesecondary plasma edge extended into the shaded area, with the plasma emission front moving at a speed comparable to the emission front speed in the forward direction, confirming the role of the shock wave in the generation of the secondary plasma. This conclusion was also corroborated by a similar experiment on the bendingof the shock wave induced by the laser bombardment at 1 atm.
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  • Frequency Modulation System Using Stimulated Brillouin Scattering and Cross-phase Modulation in Optical Fiber
    Shinji URUSHIHARA, Takehiro YOSHII, Yoichi YAMAMOTO, Kazuhiro SUZUKI, ...
    2001 Volume 29 Issue 3 Pages 184-187
    Published: March 15, 2001
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.29.184
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    To develop a broad-band laser for application to inertial confinement fusion, we have constructed a frequency modulation system that is based on cross-phase modulation in polarization preserving single-mode optical fiber. With the system, 16-GHz phase modulation was achieved using the interference between an output pulse of a single longitudinal mode Nd: YLF laser and a Brillouin-shifted component stimulated in multi-mode optical fiber.
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  • Fundamentals of Optical Communication II
    Yoichi FUJII
    2001 Volume 29 Issue 3 Pages 188-193
    Published: March 15, 2001
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.29.188
    JOURNAL FREE ACCESS
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