Optical Diagnostics

Imaging and spectroscopy for quantitative measurements in high-speed and reacting flows.

Methods

• Dual-band absorption imaging with spectral filters and infrared detectors for simultaneous two-dimensional reconstruction of species concentration and temperature.
• Forward radiative modeling using spectroscopic databases, equilibrium calculations, and reduced-order reacting-flow solutions to select measurement bands and formulate inversions.
• Self-aligned focusing schlieren and high-speed visible imaging for spatially resolved density-gradient measurements.
• Event-based imaging for asynchronous, high-dynamic-range monitoring of transient flow and combustion features.
• Explicit calibration and uncertainty analysis incorporating detector response, filter transmission, spatial resolution, temporal response, and inverse-model assumptions.

Examples

Spectral-radiance map used to select diagnostic bands.

Two-dimensional species-concentration reconstruction.

Two-dimensional temperature reconstruction.