成果報告書詳細
管理番号20160000000214
タイトル*平成27年度中間年報 水素利用技術研究開発事業 水素ステーション安全基盤整備に関する研究開発 水素火炎可視化機能を有する監視システムの研究開発
公開日2016/8/25
報告書年度2015 - 2015
委託先名株式会社四国総合研究所
プロジェクト番号P13002
部署名新エネルギー部
和文要約
英文要約Title : Research and development project for hydrogen utilization technology. Research and development concerning hydrogen station safety infrastructure development. Research and development concerning monitoring system with functions for hydrogen flame visualization. (FY2014-FY2017) FY2015 Annual Report

(1) Near-infrared region spectra of a hydrogen flame were measured to find a new wavelength region for image pickup suited to visualization of a hydrogen flame. It was found that there were intense light emissions in the near-infrared region of 1350 nm to 1700 nm while little sunlight emissions were observed in the wavelength region of 1350 nm to 1400 nm. (2) The image of a hydrogen flame was captured using a near-infrared camera (imaging element : InGaAs, spectral sensitivity characteristic: 950-1700 nm) and an optical bandpass filter (center wavelength: 1350 nm, half-value breadth: 10 nm) to verify the possibility of capturing the image of a hydrogen flame only, not including the effect of sunlight. Because the effect of sunlight is superposed in the wavelength region for image pickup that has been used (around 930 nm), differencing operation for the image taken is required to exclude that effect and extract hydrogen flame components only. It was made clear that the differencing operation became unnecessary if the near-infrared region of around 1350 nm was chosen as the target of image pickup. (3) Because halogen light and HID (high-intensity discharge; xenon) light used for automobile's headlights, and LED light may have more intense emissions in the near-infrared region rather than in the visual light region, we cannot extract hydrogen flame components by differencing operation between visible light and near-infrared light only. Therefore, we developed an image thresholding method where light intensity was divided into 256 levels and an intensity level determined arbitrarily was used as a threshold. If the intensity of headlight obtained with differencing operation is lower than that of a hydrogen flame and is greater than the threshold, it is judged to be a hydrogen flame and “1” is given, while if smaller, it is judged a noise and “0” given. However, it was found that when halogen light and hydrogen flame light were superposed in image pickup due to their positional relationship, it was not possible for this image thresholding to extract the hydrogen flame only. (4) Object lenses and ocular lenses for near-infrared light were prototyped to efficiently capture near-infrared light from a hydrogen flame with a flame length of 2 cm located at a distance of 3 m. With the lenses and a 5000 pixel image fiber for visible light combined, the image of the flame was captured using a near-infrared camera. Although the image obtained was good, light attenuated before reaching the light receiving element of the camera due to low transmittance of the fiber, the image of the hydrogen flame not being very clear. It was found that more clear images were expected to be taken if a dedicated image fiber for near-infrared light was designed.
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