On the Effects of Reflected Light in Luminescent Paint Measurements

A theoretical model is described that may be used to calculate the effects of reflected light in luminescent paint measurements. The key assumption of the model is that the paint may be treated as a diffuse reflector at the paint’s emission wavelength. This allows the application of techniques that have been developed in the fields of radiative transfer and computer graphics to the present problem. A numerical example is considered to demonstrate that, in a pressure-sensitive paint test on a Domier Alpha jet, the self-illumination effect at the paint’s emission wavelength can produce pressure errors of up to 3 percent of actual pressure. However, it is also shown that a correction of this error is possible. This correction calls for mapping image data to a 3D grid of the test article and calculating, at each element of the 3D grid, the combined reflected light contribution from all other elements on the grid. An algorithm is described for the calculation of the required influence coefficients, including the detection of occlusions.

[1]  J. W. Holmes,et al.  Analysis of radiometric, lifetime and fluorescent lifetime imaging for pressure sensitive paint , 1998, The Aeronautical Journal (1968).

[2]  Ashley F. Emery,et al.  A comparative study of methods for computing the diffuse radiation viewfactors for complex structures , 1988 .

[3]  J. Callis,et al.  Luminescent barometry in wind tunnels , 1990 .

[4]  F. E. Nicodemus.  Directional Reflectance and Emissivity of an Opaque Surface , 1965 .

[5]  M. Sellers,et al.  Demonstration test of pressure sensitive paint in the AEDC 16-ft transonic wind tunnel using the TST model , 1994 .

[6]  Bryan Campbell,et al.  Temperature- and Pressure-Sensitive Luminescent Paints in Aerodynamics , 1997 .

[7]  W. Ruyten,et al.  Correction of self-illumination and spectral-leakage effects in luminescent-paint measurements. , 1997, Applied optics.

[8]  M. Carter.  Computer graphics: Principles and practice , 1997 .

[9]  J. Bell,et al.  Pressure-sensitive paint in aerodynamic testing , 1993 .

[10]  Martin Morris,et al.  Aerodynamic applications of pressure sensitive paint , 1993 .

[11]  Tianshu Liu,et al.  Accuracy of pressure sensitive paint , 1999 .

[12]  Shuchao Wu,et al.  Performance of a precise infrared shadow sensor thermometer , 1997 .

[13]  M. Morris,et al.  Application of pressure- and temperature-sensitive paints to high-speed flows , 1994 .

[14]  J. Peterson,et al.  New technique of surface flow visualization based on oxygen quenching of fluorescence , 1980 .

[15]  W. M. Ruyten,et al.  Correcting luminescent paint measurements for self-illumination , 1997, ICIASF'97 Record. International Congress on Instrumentation in Aerospace Simulation Facilities.

[16]  M. Pinar Mengüç,et al.  Thermal Radiation Heat Transfer , 2020 .

[17]  W. M. Ruyten,et al.  Self-illumination calibration technique for luminescent paint measurements , 1997 .