Department of Chemical Engineering and Biotechnology, University of Cambridge, Pembroke Street,Cambridge CB2 3RA, UK.
Opt Lett. 2009 Aug 15;34(16):2492-4. doi: 10.1364/ol.34.002492.
We report on kilohertz-repetition-rate flame temperature measurements performed using blue diode lasers. Two-line atomic fluorescence was performed by using diode lasers emitting at around 410 and 451 nm to probe seeded atomic indium. At a repetition rate of 3.5 kHz our technique offers a precision of 1.5% at 2000 K in laminar methane/air flames. The spatial resolution is better than 150 microm, while the setup is compact and easy to operate, at much lower cost than alternative techniques. By modeling the spectral overlap between the locked laser and the probed indium lines we avoid the need for any calibration of the measurements. We demonstrate the capability of the technique for time-resolved measurements in an acoustically perturbed flame. The technique is applicable in flames with a wide range of compositions including sooting flames.
我们报告了使用蓝色二极管激光器进行的千赫兹重复频率火焰温度测量。通过使用发射波长约为 410nm 和 451nm 的二极管激光器进行二原子荧光，探测被种子化的原子铟。在 3.5kHz 的重复率下，我们的技术在层流甲烷/空气火焰中在 2000K 时提供了 1.5%的精度。空间分辨率优于 150μm，同时该设置紧凑且易于操作，成本远低于替代技术。通过对锁定激光和探测铟线之间的光谱重叠进行建模，我们避免了对测量进行任何校准的需要。我们展示了该技术在受声波干扰的火焰中进行时间分辨测量的能力。该技术适用于包括含碳火焰在内的各种组成的火焰。
