The Dielectric Barrier Discharge (DBD) is composed of
many Filamentary Discharges (FDs), and it can be applied to ozone
generation, gaseous pollution control, etc. In our laboratory, we
investigated efficient cleaning methods of diesel exhaust gas by DBD. From
the results of numerical simulation of chemical reactions, a homogeneous DBD
was expected to improve the efficiency of pollution control and also the
ozone yield. Recently, we found that a DBD device using alumina as barrier
material can generate an Atmospheric Pressure Townsend Discharge (APTD) in
air. In this research, we setup two ozonizers with different discharge modes
of FD and APTD, and compared the ozone yield. The experimental results
showed that the ozone yield was higher by the FD mode than by the APTD mode
in lower Specific Input Energy (SIE) region. However in the region that the
SIE is larger than 420J/L, the APTD mode showed higher ozone yield than FD
mode.