Laser induced fluorescence spectroscopy of OH radicals in an atmospheric pressure discharge

Summary form only given, as follows. Laser induced fluorescence (LIF) spectroscopy is used to study the temporal and spatial evolution of OH radicals in atmospheric pressure dielectric-barrier-discharge in air. A Nd:YAG pumped dye laser with wavelength doubler is used to generate the excitation wavelength in the 282 nm range. The laser is tuned to the Q(0,0) resonance of OH and a broadband detection is done of the Q(0,1) manifold. An image intensified CCD camera is used to record the fluorescence along with a narrow-band spectral filter. The discharge is operated at atmospheric pressure in air. The discharge configuration is planer with a single dielectric inserted between electrodes. Measurements of OH concentration with respect to the excitation voltage will be reported. Also spatial measurements of OH concentration in the gap will be reported.