The Review of Laser Engineering
Online ISSN : 1349-6603
Print ISSN : 0387-0200
ISSN-L : 0387-0200
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Volume 43, Issue 1
Special Issue on States and Prospects of Industrial Lasers in Asia
Displaying 1-11 of 11 articles from this issue
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Special Issue on States and Prospects of Industrial Lasers in Asia
Special Issue
Laser Review
Laser Original
Regular Paper
Laser Original
  • Development of Edible Oil Identification Sensor Using Near Infrared Laser Diodes
    Tadaetsu HIRAO, Kazuki KOBAYASHI, Yasunori SAITO
    2015 Volume 43 Issue 1 Pages 31-
    Published: 2015
    Released on J-STAGE: December 17, 2020
    DOIhttps://doi.org/10.2184/lsj.43.1_31
    JOURNAL FREE ACCESS
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    We developed a prototype of an oil identification sensor to realize food safety and measures of that purpose. We analyzed the absorption spectrum of six edible oils and one inedible oil and determined five infra-red wavelengths for identifying them. We used 1657, 1685, 1713, 1727, and 1750 nm and five laser diodes (LD) of each wavelength for our prototype sensor. The small, 36 (width) × 80 (length) × 46 mm (height) prototype sensor had a pair of a projector (five LDs) and a receiver (one photo-diode) to slot it into a factory sensor system. The identification time for one oil sample was 250 microseconds. Such capability is adequate to be adapted into a factory checking line. The oils were clearly distinguished at different positions in a two-dimension map with normalized absorbance ratio at 1727 nm to at 1713 nm vs. absorption difference at 1727 nm and at 1713 nm.
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  • Estimation of Gas Temperature in Ozonizer Using Laser Interferometry
    Satoshi IHARA, Saburoh SATOH
    2015 Volume 43 Issue 1 Pages 36-
    Published: 2015
    Released on J-STAGE: December 17, 2020
    DOIhttps://doi.org/10.2184/lsj.43.1_36
    JOURNAL FREE ACCESS
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    We measured the gas temperature on a surface discharge ozonizer by a Michelson interferometer using a He-Ne laser. The ozonizer has a configuration of a thin dielectric material plate (Al2O3) that is put between a stripe-shaped high voltage electrode and a grounded electrode. In these experiments, oxygen gas with a flow rate of 1.5 l/min was used for ozone generation, and ozone concentrations of 28 and 33 g/m3 were obtained at discharge powers of 31 and 57 W. The gas temperature was about 50 ℃, 70 ℃ at 2.5 mm from the surface of the ozonizer elements. The estimated temperature agreed qualitatively with the results of thermal conduction analysis.
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  • Refractive Index Measurement of Magnesium Oxide Under Ultra High-Pressure
    Kohei MIYANISHI, Norimasa OZAKI, Yoshinori TANGE, Tomoaki KIMURA, Yo ...
    2015 Volume 43 Issue 1 Pages 41-
    Published: 2015
    Released on J-STAGE: December 17, 2020
    DOIhttps://doi.org/10.2184/lsj.43.1_41
    JOURNAL FREE ACCESS
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    We investigated the refractive index of shock-compressed magnesium oxide in the 100‒400 GPa pressure range. Shock Hugoniot and a refractive index were measured using a laser-shock compression technique. The refractive index of MgO decreases monotonically with pressure to ~220 GPa along the Hugoniot and increases above the pressure. This result indicates that magnesium oxide is optically transparent enough to be used as a shock window at such dynamic high pressures.
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