利用双线OH荧光对燃烧气体超声自由射流进行温度成像。

Temperature imaging in a supersonic free jet of combustion gases with two-line OH fluorescence.

作者信息

Palmer J L, Hanson R K

出版信息

Appl Opt. 1996 Jan 20;35(3):485-99. doi: 10.1364/AO.35.000485.

DOI:10.1364/AO.35.000485

Abstract

Temperature measurements were performed in a shock-tunnel-generated free jet of hydrogen/oxygen reaction products diluted in argon with a nonsimultaneous, two-excitation-line planar laser-induced fluorescence technique with the hydroxyl radical (OH) as a tracer. Single-shot images were obtained with broadband excitation of isolated transitions in the A(2)Σ(+) ? X(2)Π(1, 0) band of OH near 282 nm, with broadband, temporally integrated detection of the resulting nonresonant emission. A measurement of the fluorescence lifetime in the free jet showed no variation with excited rotational level, allowing the rotational temperature to be obtained from the ratio of single-shot images with laser excitation of different rovibronic transitions.

摘要

利用以羟基自由基（OH）为示踪剂的非同时双激发线平面激光诱导荧光技术，在激波风洞产生的、用氩气稀释的氢气/氧气反应产物自由射流中进行了温度测量。通过对282nm附近OH的A(2)Σ(+) ? X(2)Π(1, 0)带中孤立跃迁的宽带激发获得单次图像，并对产生的非共振发射进行宽带时间积分检测。对自由射流中荧光寿命的测量表明，其不随激发转动能级变化，从而可根据不同振转跃迁激光激发的单次图像之比获得转动温度。