Abstract
To improve power density of polymer electrolyte fuel cells (PEFCs), it is essential to understand oxygen transport mechanism inside fuel cell. We have investigated the possibility of applying tunable diode laser absorption spectroscopy (TDLAS) technique to measuring oxygen concentration within micro-channel of fuel cell. In this study, the fiber-optic laser spectroscopy system for high-speed and high-sensitive detection of oxygen gas was developed based on TDLAS method, and the oxygen concentration in a gas cell was tentatively measured using this system. It was noted that the long optical path length of 200 mm enables the high-accurate monitoring of oxygen concentration.
