公开(公告)号：US20230040397A1

公开(公告)日：2023-02-09

申请号：US17880751

申请日：2022-08-04

Applicant: Drexel University

Inventor： Matthew McCarthy ,  Deborah Kapilow

IPC: G01J5/48 ,  G01J5/061 ,  G01J5/08 ,  G01J5/04

Abstract: A backside thermography technique was developed based on the temperature sensitivity of laser-induced fluorescence in flowing two-dye solutions. The approach utilizes visible light and optically transparent packaging materials to obtain spatially resolved transient thermal measurements. This technique is compatible with optically transparent water-cooled packaging, which will allow for the characterization of processes where heat is added as well as removed. A setup was designed, constructed, and used to study the performance of seven two-dye Rhodamine B (RhB)-Rhodamine 110 (Rh110) fluorescent solutions. The effect of dye concentration ratio on sensitivity, maximum frame rate, and excitation area was characterized. The system was used to demonstrate in-situ temperature measurements showing the importance of two-dye light compensation, as well as backside thermography using a simple droplet contact method to investigate temporal response. Droplet contact experiments were conducted on actively heated and cooled surfaces to study local temperature and heat flux behavior during phase change.