Abstract
A single-camera three-dimensional Multiplexed Structured Image Capture (3D-MUSIC) based stereoscopic imaging system is demonstrated to obtain a three-dimensional fuel-to-air ratio (FAR) map of a methane-air Bunsen flame at standard atmosphere conditions. Images of the C2* (500nm) and CH* (430nm) emissions are spatially modulated and captured through two optical paths and combined into a single image on the camera. The C2* / CH* ratio is computationally recovered by low-pass filtering in the spatial frequency domain and exhibits a linear trend to a FAR map of the flame. Each channel's unique FAR map is fused to generate a line-of-sight three-dimensional FAR map by triangulating points from each channel's perspective. As an imaging technique, the 3D MUSIC is capable of obtaining multi-spectral multi-view 3D images using spatial modulation and recovery in one camera without any special illumination. It may be extended for applications in combustion, biomedical, and other key diagnostics.
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