Phase Doppler Interferometry with Probe-to-Droplet Size Ratios Less Than Unity. Part II: Application of the Technique
AIR FORCE RESEARCH LAB EDWARDS AFB CA PROPULSION DIRECTORATE WEST
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Practical limitations associated with the use of small probe volumes for measuring large droplets with the phase Doppler interferometry technique are discussed. An intensity validation scheme and corresponding probe volume correction factor have been developed that reject trajectory errors and account for the rejections in calculation of the probe cross-sectional area. The intensity validation scheme also provides a tractable method of setting the photomultiplier tube gain and laser power. Volume flux measurements in dilute sprays have shown a significant improvement over standard phase Doppler interferometry techniques at small beam waist to droplet size ratios.