Examination of cameras for near-wall PIV measurements in high speed flows

A camera system consisting of two 10-bit DALSA DS-1-01M28 cameras with a combined linear-logarithmic (LinLog) response was compared to a 14-bit Cooke PCO 1600 camera for near-wall PIV. The primary goals are minimization of wall reflection induced blooming and subsequent data loss. The LinLog response is programmable and can be used to achieve a dynamic range of 120dB, where bright (reflected) light is attenuated. The PCO camera allowed for minimization of the reflection by utilizing the highly sensitive sensor to lower the laser power. For the present Mach 3.0 application, both camera systems allowed for measurements to within about 1.0-1.5 mm from a Plexiglas surface. The DALSA system was significantly less sensitive, more difficult to align and the LinLog response was not optimized here. Nonetheless, the data was comparable to that from the PCO camera, which was relatively simple to use. The cost of the DALSA system was roughly one third that of the PCO system.

Examination of cameras for near-wall PIV measurements in high speed flows Conference Paper