基于激光诱导荧光的高速飞行粒子低温段测温方法

针对当前高速飞行固体粒子在低温段测温困难的问题,提出了一种基于激光诱导荧光的固体测温方法来显示高速粒子飞行过程中的温度变化过程。使用掺杂罗丹明B染料的醋酸纤维粒子的600 nm荧光信号和激光的532 nm信号之比,能进一步排除激光光强波动对测温结果的干扰。对固体荧光粉末在20~80 ℃温度下的光谱学特征进行分析,研究发现:系统的荧光信号强度、温度灵敏度(80 ℃下温度系数为-0.012 5 ℃-1,20 ℃下温度系数为-0.037 9 ℃-1)、测量精度均随温度的下降显著上升,验证了该方法在低温段温度测量的应用潜力。基于该方法对高速气流下粒子撞靶的温度变化规律进行定性分析。 

Thermometry method for high speed flying particle at low temperature based on laser induced fluorescence technique

A thermometry method was presented for high speed flying particles in low temperature applications with difficulty in measurement. Rhodamine B was doped in cellulose acetate particles to visually show spacial temperature distribution of these particles. The ratio of 600 nm photo luminescence fluorescence signal from these dye doped particles and 532 nm laser signal for excitation was applied to further eliminate interference from laser intensity fluctuation. Spectrum of dye particles at different temperature ranging from 20 ℃ to 80 ℃ was analyzed. Photo luminescence intensity, temperature sensitivity (-0.012 5 ℃-1 temperature coefficient at 80 ℃ and -0.037 9 ℃-1 temperature coefficient at 20 ℃) and measuring accuracy were significantly enhanced with temperature decline, further proving the potential of this technology at low temperature applications. Temperature behavior of high speed dye particle hitting target was present by this technique.