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Sequential signal detection for high dynamic range time-resolved laser-induced incandescence

机译:顺序信号检测,用于高动态范围时间分辨的激光诱导白炽灯

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摘要

A new method for collecting time-resolved laser-induced incandescence (TiRe-LII) signals with high dynamic range is presented. Gated photomultiplier tubes (PMT) are used to detect temporal sections of the LII signal. This helps to overcome the limitations of PMTs caused by restricted maximum signal current at the strong initial signal and poor signal-to-noise ratios when the signal intensity approaches the noise level. We present a simple method for increasing the accuracy of two-color pyrometry at later decay times and two advanced strategies for getting high accuracy over the complete temperature trace or even achieve single-shot capability with high dynamic range. Validation measurements in a standardized flame show that the method is sensitive enough to even resolve the local increase in gas temperature as a consequence of heating the soot particles with a laser pulse.
机译:提出了一种收集高动态范围时间分辨激光诱导白炽灯(TiRe-LII)信号的新方法。门控光电倍增管(PMT)用于检测LII信号的时间部分。当信号强度接近噪声水平时,这有助于克服由于强初始信号时最大信号电流受限以及信噪比差而导致的PMT的局限性。我们提出了一种简单的方法,可以在以后的衰减时间提高双色高温计的精度,还提供了两种先进的策略,可以在整个温度曲线上获得高精度,甚至可以实现具有高动态范围的单发功能。在标准火焰中进行的验证测量表明,该方法足够灵敏,甚至可以解决由于用激光脉冲加热烟尘颗粒而导致的气体温度局部升高。

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