imaging, refluorescence filter for non-intrusive flow diagnostics A narrow passband

1996, American Institute of Aeonautioj and Astronautics, Inc. We present a novel design for an ultra-narrow spectral passband filter capable of image preservation. The filter is based on atomic mercury vapor absorption and re-fluorescence and is capable of achieving a 0. 1 cm-1 passband, at 253. 7nm. The filter features a variable width passband, and temporal gating to improve out-of-band extinction. The refluorescence filter is designed to be used to observe light scattered from a flow field which is illuminated by an injection seeded, cavitylocked Ti: Sapphire laser system. In this paper, we briefly describe the laser system and its utility for diagnostics. We continue with a characterization of the refluorescence filter, detailing its operation, its spectral, temporal, and spatial discrimination, as well as its efficiency, and its application to non-intrusive flow diagnostics.

A narrow passband, imaging, refluorescence filter for non-intrusive flow diagnostics Conference Paper