Optical Time of Arrival Measurements

THE ULTIMATE OBJECTIVE OF THE PROPOSED WORK IS TO PROVIDE THE GOVERNMENT WITH PROVEN MINIATURE PRESSURE INSTRUMENTATION FOR MEASURE DUSTY FLOW BOUNDARY LAYERS IN SMALL-SCALE HE, WINDTUNNEL, AND SHOCK TUBE TESTS. SMALL PROBES ARE NEEDED FOR MAKING MEASUREMENTS NEAR THE WALL OR DUST BED. PHASE I WILL EVALUATE THE TECHNICAL CAPABILITIES OF EXISTING SMALL SENSORS FOR USE IN SNOB/GREG PROBES AND WILL INVESTIGATE THE FEASIBILITY OF MINIATURIZING LDV PROBES. IT WILL PRODUCE A DESIGN FOR A MINIATURE SNOB/GREG PROBE SYSTEM, USING THE SMALLEST RELIABLE SENSORS AVAILABLE, AND A PRELIMINARY DESIGN FOR A SMALL LDV PROBE. A PROPTOTYPE GREG PROBE WILL BE DEVELOPED IN PHASE I. A PRELIMINARY DESIGN OF A RAKE TO ACCOMMODATE THE SMALL SNOB/GREG. LDV PROBES WITH BE COMPLETED. SUCCESSFUL OUTPUT OF PHASE I WILL FULLY SUPPORT STANDARDIZED HARDWARE DEVELOPMENT IN PHASE II. THE GOAL WILL BE TO DEVELOP SENSORS AND A RAKE CAPABLE OF ACCURATELY MEASURING THE DUSTY FLOW FOR SUBCALE TESTS AS LOW A 1/100 SCALE (BASED ON 1-MT BURST). SUCESSFUL COMPLETION OF PHASE II WILL PROVIDE THE GOVERNMENT WITH A NEW CAPBILITY TO TEST AT SMALL, COST-EFFECTIVE SCALES, AND TO STUDY DUST PARTICLE SIZE SCALING PHEONOMENA. IT ALSO WILL SUPPORT BASIC STUDIES OF TURBULENT DUSTY FLOWS NEEDED FOR HYDROCODE DEVELOPMENT AND EVALUATION.