携帯型マッピングシステム連動車載式LD分光メタン検出装置

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  • Vehicle mounted methane detector by means of LD spectroscopy combined with a mobile GIS
  • ケイタイガタ マッピング システム レンドウ シャサイシキ LD ブンコウ メ

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We have developed a vehicle mounted methane detector by means of 1.65-micron LD (Laser Diode) spectroscopy combined with a mobile GIS (Geographic Information System). The detector is used for high-speed survey of gas leakage from underground pipelines.<br>The detection limit of the detector is about 70 ppb in optical path length of 1 meter with time constant of 1 second. This high sensitivity is achieved by second-harmonic detection of modulation frequency of the LD the center wavelength of which is stabilized on the center of an absorption line of methane.<br>The position of the vehicle is determined with accuracy of 1-3 meters by a vehicle positioning machine which is connected to a DGPS (Differential GPS, GPS: Global Positioning System) receiver and a fiber-optic gyroscope. Survey tracks and detection points are displayed and recorded on the mobile GIS which consists of information of pipeline network, streets, buildings and so on.

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