ASYNC-ELF: 10K USD, 1KG, 100KHZ-EQUIVALENT 3D OPTICAL DIAGNOSTICS FOR HYPERSONIC TESTING
Abstract
Wind-tunnel and flight-tests remain critical to hypersonic research; e.g., for elucidating hypersonic fluid-structure interactions (FSI) where complex physics are coupled. Unfortunately, existing diagnostic tools are limited to (i) large, costly high-speed cameras or (ii) small, low-cost point-sensors. The latter is ideal for embedding in models and support �(10-100kHz) acquisitions, but do not provide spatially-resolved data. Externally-mounted kHz-rate cameras are used when 2D-3D data is critical (e.g. flow visualization in FSI), but their usages are difficult in wind-tunnel and almost absent in flight-test due to excessive footprint, mass, cost and data size. To achieve the best of both worlds, this research aims to develop a new paradigm of image-based 3D diagnostics, which combines ~100kHz-equivalent acquisition with significantly reduced cost (~10k USD), mass (~1 kg), and footprint (~5cm). The technique, called “Async-ELF� (Asynchronous Embedded Light-Field-Waveguide imaging), is enabled by: (a) nascent low-cost event-based (EB) cameras with data-efficient asynchronously-triggered pixels and (b) light-field-waveguide optics that reduces optical components’ footprints. A 3-year roadmap is laid out to develop Async-ELF and validate it in both tunnel and flight-test environments. Within the proposed initial scope: methodology for time-resolved EB measurement of 3D structural dynamics will be developed, catering to hypersonic FSI research. Hardware and algorithm design, along with benchtop tests will be carried out at NYCU in Year-1. This is followed by tests on realistic hypersonic panels at NCKU’s transonic tunnel in Year-2. The system’s theoretical performance envelop will also be quantified, especially in conjunction with the unique requirements of hypersonic tunnel-flight-tests. Summarily, the proposed work will establish the feasibility of Async-ELF, and generate preliminary capability for a new diagnostic paradigm that is conducive for both time-resolved 3D measurement and embedding in small models-vehicles.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Jan 04, 2023
- Source ID
- FA23862210135
Entities
People
- Zu Puayen Tan
Organizations
- Air Force Office of Scientific Research
- National Yang Ming Chiao Tung University
- United States Air Force