Molecular sensors such as Pressure-Sensitive Paint (PSP) and Temperature-Sensitive Paint (TSP) could be an ideal surface measurement technique in microfluidics, because the sensor probes in these paints are on the order of nanometers. In apply molecular sensors on small objects, the homogeneity and the brightness of the coating is the most important factors. In this study, we evaluated the spatial homogeneity of the coatings prepared by three different techniques (spray coating, spin coating, and dip coating) by using a fluorescent microscope measurement system and found that the dip coating method gave the best result We also found that the raising speed, polymer concentration, and a type of solvent had a strong effect on coating homogeneity. To validate the capability of molecular sensors for surface measurements on micro objects, we applied PSP and TSP on a cone-cylinder model with diameter 2 mm and tested it in a miniature supersonic wind tunnel at Mach 2. A comparison between experimental data and CFD result has shown that the two data agree within ±1.6% of the tunnel total pressure. The largest factor of error was the image registration error. Some visualization images were also obtained on the more complicated models. The effectiveness of molecular sensors for surface measurement on micro objects has been demonstrated.
|Number of pages||11|
|Publication status||Published - 2004 Jul 1|
|Event||42nd AIAA Aerospace Sciences Meeting and Exhibit - Reno, NV, United States|
Duration: 2004 Jan 5 → 2004 Jan 8
|Other||42nd AIAA Aerospace Sciences Meeting and Exhibit|
|Period||04/1/5 → 04/1/8|
ASJC Scopus subject areas