SAFS: NASA’s Polarized Light Camera Makes Airflow Visible Like Never Before
NASA Langley’s Self-Aligned Focusing Schlieren (SAFS) imaging uses light polarization to visualize airflows in wind tunnels, simplifying beyond traditional dual-grid schlieren setups. Since its 2020 debut, SAFS offers faster, cheaper, on-site flow visualization, captures complex shock structures around boosters, and is now used by 50+ institutions in 8+ countries, earning the 2025 R&D 100 Award and NASA’s Government Invention of the Year.