Malmqvist E, Borggren J, Aldén M, Bood J
Appl Opt. 2019 Feb 1;58(4):1128-1133. doi: 10.1364/AO.58.001128.
In this work, Scheimpflug lidar has been combined with the thermometric technique two-line atomic fluorescence, to carry out stand-off, spatially resolved temperature measurements. Indium atoms were seeded into a modified Perkin-Elmer-burner and two tunable single-mode diode lasers with their wavelengths tuned to 410.17 and 451.12 nm were used to excite the seeded atoms. The fluorescence signal was collected using both a line-scan detector and a two-dimensional intensified CCD camera. One-dimensional flame temperature profiles were measured at different heights above a porous-plug burner, located at a distance of 1.5 m from the lidar system. The technique was also used to demonstrate two-dimensional temperature measurements in the same flame. The accuracy of the measured temperature was found to be limited mainly by uncertainty in the spectral overlap between the laser emission and the indium atom absorption spectrum as well as uncertainty in laser power measurements. With the constraint that indium can be introduced into the measurement volume, it is anticipated that the developed measurement concept could constitute a valuable tool, allowing in situ spatially resolved thermometry in intractable industrial applications, sufferings from limited optical access, thus requiring remote single-optical-port sensing.
在这项工作中，将施密特激光雷达与双谱线原子荧光测温技术相结合，进行远距离、空间分辨温度测量。将铟原子注入改进的珀金埃尔默燃烧器中，并使用两台波长调谐至410.17和451.12 nm的可调谐单模二极管激光器来激发注入的原子。使用线扫描探测器和二维增强型电荷耦合器件相机收集荧光信号。在距激光雷达系统1.5 m处的多孔塞燃烧器上方不同高度测量一维火焰温度分布。该技术还用于演示同一火焰中的二维温度测量。发现测量温度的精度主要受激光发射与铟原子吸收光谱之间光谱重叠的不确定性以及激光功率测量的不确定性限制。在铟可引入测量体积的限制条件下，预计所开发的测量概念可成为一种有价值的工具，允许在难以处理的工业应用中进行原位空间分辨测温，这些应用存在有限的光学通道，因此需要远程单光口传感。
