Nonintrusive Droplet Characterization System
Agency / Branch:
DOD / USAF
This proposal describes a program to develop a system to measure the spatial distribution of droplet size, liquid water content, and the droplet velocity in engine test cells. The twelve foot duct diameter rules out most light scattering and imaging techniques. The liquid water content of up to 5.6 g/m3 dictates that the probe volume must be no larger than about 10E8 micron3 resulting in a narrow waist with a limited Rayleigh range. To avoid the presence of potentially harmful objects in the inlet path, the proposed system must have a long range with the transmitter and the receiver remaining outside the specified 12 foot duct. The proposed system includes a laser sheet that can be focused to the required waist dimensions anywhere along the duct. The light scattered by droplets crossing the center of the focused sheet is collected by a receiver that tracks the waist position. Several schemes to locate the center of the laser sheet and avoid Gaussian ambiguity will be evaluated. Phase I will include analytical and experimental research that define optimum strategies that will be tested on a breadboard under controlled conditions.
Small Business Information at Submission:
Principal Investigator:Cecil F. Hess, Ph.d.
18006 Skypark Circle #108 Irvine, CA 92714
Number of Employees: