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Report No.
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Development of an imaging system for the observation of water behavior in a channel in PEMFC

Nojima, Takehiro; Yasuda, Ryo; Takenaka, Nobuyuki*; Katagiri, Masaki*; Iikura, Hiroshi  ; Sakai, Takuro; Matsubayashi, Masahito  

A new imaging system was developed for observing water distribution in a polymer electrolyte membrane fuel cell (PEMFC) under operation. This imaging system realizes both low-noise and high-sensitivity imaging, enables image capture with a relatively short exposure time (approximately sub-seconds) and effectively visualizes the internal events of a PEMFC. It consists of an electron multiplying charge coupled device (EMCCD) camera, new $$^{6}$$LiF/ZnS scintillator screen, and slit system. The EMCCD camera has a wide dynamic range and high sensitivity, and the brightness of the new $$^{6}$$LiF/ZnS scintillator screen is approximately twice as high as that of conventional $$^{6}$$LiF/ZnS scintillator screen. The slit system is used to reduce the white dot noise caused by the primary and/or secondary prompt $$gamma$$ rays. By a characteristic test, it was demonstrated that water behavior in the channel of a PEMFC can be clearly and qualitatively observed using the new imaging system.

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