The ultimate objective is the development of a vane-type flow direction sensor to measure the rapid changes that occur in a precursed blast wave. Such a sensor will consist of a small cylindrical probe with movable vanes projecting from it. The waves will be placed as near the end of the probe toward the explosion as possible to minimize the disturbance of flow at the vanes by the probe. The probe will be made as small as possible with the intent that it be usable in and over a helium layer as small as two inches thick. The vanes will be made of strong, abrasion resistant material. In this phase I study the minimum requirements that must be met for precursed blast wave studies will be established, and the vane and probe designed and the means for sensing the angle of rotation of the vanes determined. In phase ii the complete sensor system will be built and tested.
