A quadruple-frame volumetric PTV system using RGB cameras and telecentric lenses

Novel processing algorithms (e.g., Shack-The-Box, STB) for particle tracking have been developed and have largely improved the tracking accuracy and efficiency; however, such algorithm needs to utilize at least four consecutive frames, which calls for the need for ultra-high-speed cameras and high-power illumination source. In this study, we take a different approach to provide hardware support for the STB algorithm by using four prism-based multi-sensor RGB cameras, and an in-house designed RGB LED light array. This system can provide quadruple-frame realizations using cost-effective hardware. In addition, we employ telecentric lenses to reduce projection error as well as simplify the calibration process. We demonstrate this technique in a simplified cerebral aneurysm model and discuss the pros and cons of this system compared to other volumetric PTV systems.