Abstract
Two-color laser induced fluorescence (LIF) diagnostics techniques were used to map the temperature distribution of fluid moving through a micro-channel. The fluid (de-ionized water) was pumped through a closed-loop system consisting of an ice bath and a 3 mm x 3 mm channel machined in a heated aluminum block. Temperature-sensitive (rhodamine 610 chloride) and temperature-insensitive (sulforhodamine 640) dye molecules were added to the fluid. Fluorescence from the dye molecules was induced with a two-dimensional sheet of laser light (532nm from a Nd:YAG laser) and the intensity of the signal from each dye was measured with a charge-coupled device (CCD) camera fitted with a 5X microscope objective. The ratio of the emitted intensity from the two dyes was used to obtain a two-dimensional temperature map of the fluid. The final system is capable of generating images with 5 micron resolution and has a sensitivity to temperature of about 0.8% per degree Kelvin. The temperature field images were acquired from a steady-state laminar flow in a square channel.
Gallina, Mark J. (2002). Development of a two-color laser-induced fluorescence based temperature imaging device with micro-scale resolution. Master's thesis, Texas A&M University. Available electronically from
https : / /hdl .handle .net /1969 .1 /ETD -TAMU -2002 -THESIS -G22.