Real-time imaging of methane gas leaks using a single-pixel camera
Real-time imaging of methane gas leaks using a single-pixel camera
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DOI：
10.1364/oe.25.002998
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发表时间：
2017-02-20
期刊：
影响因子：
3.8
通讯作者：
Padgett, Miles J.
中科院分区：
文献类型：
--
作者：
Gibson, Graham M.;Sun, Baoqing;Padgett, Miles J.
我们展示了一个摄像机，可以在视频速率甲烷气体的图像，只使用一个单像素检测器和结构化照明。光源是工作在1：651 μ m的红外激光二极管，调谐到甲烷气体的吸收线。使用可寻址的阵列来构造光，以利用阿达玛掩模序列来图案化激光输出。使用单像素InGaAs检测器记录所产生的反向散射光，该检测器提供投影图案与场景中的气体分布之间的相关性的测量。这种相关性和模式的知识允许重建场景中气体的图像。对于定位气体泄漏的应用，相机的帧速率是最重要的，在这种情况下，其与线性分辨率的平方成反比。在这里，我们展示了在使用256个掩模图案（对应于16 x16的图像分辨率）的同时以类似于25 fps的速度进行气体成像。为了帮助定位气体排放源的任务，我们将低分辨率气体图像的上采样和平滑图像叠加到使用标准CMOS相机记录的高分辨率彩色图像上。我们证明了只有5 mW的照明横跨视场的甲烷气体泄漏的成像类似于0.2升/分钟，从一个类似于1米的距离。
We demonstrate a camera which can image methane gas at video rates, using only a single-pixel detector and structured illumination. The light source is an infrared laser diode operating at 1 : 651 mu m tuned to an absorption line of methane gas. The light is structured using an addressable micromirror array to pattern the laser output with a sequence of Hadamard masks. The resulting backscattered light is recorded using a single-pixel InGaAs detector which provides a measure of the correlation between the projected patterns and the gas distribution in the scene. Knowledge of this correlation and the patterns allows an image to be reconstructed of the gas in the scene. For the application of locating gas leaks the frame rate of the camera is of primary importance, which in this case is inversely proportional to the square of the linear resolution. Here we demonstrate gas imaging at similar to 25 fps while using 256 mask patterns (corresponding to an image resolution of 16x16). To aid the task of locating the source of the gas emission, we overlay an upsampled and smoothed image of the low-resolution gas image onto a high-resolution color image of the scene, recorded using a standard CMOS camera. We demonstrate for an illumination of only 5mW across the field-of-view imaging of a methane gas leak of similar to 0.2 litres/minute from a distance of similar to 1 metre.