反ストークスラマン散乱を用いた水素ガスの漏洩検知

概要

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An experimental study was performed to evaluate the applicability of anti-Stokes Raman scattering to leak detection of hydrogen gas. The laser beam of wavelength 355 nm and Stokes beam of wavelength 416 nm were aligned in a collinear configuration, and hydrogen gas was released into air through a nozzle of aperture 1 mm placed immediately below the beam path. The anti-Stokes beam of wavelength 309 nm was generated by coherent anti-Stokes Raman scattering. The three beams were incident on a diffusing plate, and the anti-Stokes beam was selectively imaged using an image intensifier and two interference filters. The interference filters provided sufficient rejection at 355 nm, 416 nm, and at fluorescence wavelengths to provide a clear image at 309 nm. The anti-Stokes beam could be imaged down to hydrogen gas release rates of 2 ml/min when the nozzle exit was 0.5 mm below the laser beam and Stokes beam. The anti-Stokes beam could be imaged for separation distance (between the laser and Stokes beams and the nozzle exit) of <3.5 mm, for a gas release rate of 10 ml/min.
社団法人電気学会の論文
2008-07-01