Tunable Laser Absorption Imaging for 2D Gas Measurement With an Electronic Rolling Shutter Camera

High spatial resolution two-dimensional (2D) imaging of gas flow is essential for better understanding and characterization of a combustion field. We propose a method for 2D gas measurement with high spatial resolution by combining tunable laser absorption spectroscopy and an imager with an electronic rolling shutter through their common feature of time scanning. The method was demonstrated by oxygen measurement using a 764nm vertical cavity surface emitting laser and a low-cost CMOS camera. 2D imaging of the oxygen concentration distribution were obtained at a frame rate of 15fps with a horizontal spatial resolution of about $28\mu \text{m}$ . This method enjoys simple structure, low cost, high spatial resolution and shows potential in the 2D and 3D reconstruction of the combustion field.