赤外線レーザによる MHD 燃焼プラズマ導電率の高精度測定

The electrical conductivity is one of the most important parameters governing the performance of an MHD power generator. The far-infrared laser has offered a powerful diagnostic tool for measuring this quantity. The conductivity of seeded flame is obtained by measuring the transmissivity of the FIR laser beam through a flame. However, care should be taken for the transmissivity measurement because the laser beam is refracrted and expands in the flame due to the electrons. In the present paper, a method involving integrating beam intensity profiles is suggested to account for this effect. The measured conductivity with this correction agrees very well with the theoretical calculation.