Optimization of Optical Filters for Ratiometric Laser Induced Fluorescence Thermometry using a Standard Color Camera

This work is motivated by the development of Quantum Dot Thermometry, a ratiometric Laser Induced Fluorescence (LIF) based technique using nanocrystal quantum dots that are modified to disperse into the working fluid (Perfluoropentane) of the NASA ZBOT (Zero-Boil-Off Tank) experiment. The constraints associated with the experimentalimplementation on the ISS (International Space Station) present multiple challenges in translating the technique from the lab to the ISS experiment. One challenge is the requirement to utilize an off-the-shelf color camera with a standard Bayer color filter array. In this talk, we will discuss the optimization of the imaging filters based on the color response curves of the camera and the measured emission spectra of the quantum dots. We will demonstrate the use of the filter and show its impact on the temperature sensitivity while discussing the trade-offs in its deployment.