AsyncELF 2.0- Hypersonic Ground-Test and Transonic Flight-Test with the Asynchronous Embedded Light-Field Paradigm
Abstract
Wind-tunnel and flight testing of scaled geometries or full-size vehicles are critical to the advancement of hypersonic research. Though widely used, existing measurement apparatus such as high-speed cameras and point-sensors contain limiting trade-offs in hypersonic applications. For example, point-sensors are ideal for embedding within test articles, but they may be intrusive and generally lack spatial resolution. On the other hand, 10-100kHz high-speed cameras provide 2D-3D data but are too large to fit within many vehicles. Additionally, their high data throughput poses a flight downlink challenge. To gain the best of both worlds, we are presently developing a new technique called AsyncELF or Asynchronous Embedded Light-Field, which aims to provide kHz-rate, data-sparse 2D-3D measurement capability with a level of compactness close to point-sensors.AsyncELF comprises four technical foundations- (i) nascent event-based (EB) imaging technology as the primary sensor, (ii) optical design to enable subject-driven 2D-3D imaging requirement, (iii) post-processing algorithm that enables measurement based on the EB paradigm and (iv) payload system design and operational know-how to effectively deploy AsyncELF on flight vehicles and in wind-tunnels. The first phase of our effort (FA2386-22-1-0135) developed the methodology for measuring 3D structural flutter using AsyncELF. This culminated in shakedown tests at the National Cheng Kung University’s transonic tunnel.Phase 2 is hereby proposed, where efforts will focus on demonstrating, refining and deploying the new technology over a three-year period. Ground-based tests will be performed at hypersonic facilities such as the Ludwieg Tube at the United States Air Force Academy (USAFA), while flight experience with AsyncELF will be gained through launches on transonic-supersonic sounding rockets at NYCU. These efforts will collectively advance the fundamental measurement science of EB imaging in hypersonic applications.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Feb 16, 2024
- Source ID
- FA23862314097
Entities
People
- Zu Puayen Tan
Organizations
- Air Force Office of Scientific Research
- National Yang Ming Chiao Tung University
- United States Air Force