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Methods for Enhancing Radar REMPI Sensitivity

机译：增强雷达REMPI灵敏度的方法

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Radar REMPI is a promising technique and alternative to other laser diagnostics such as laser-induced fluorescence, Raman scattering or coherent anti-Stokes Raman scattering. While measurements in nitric oxide illustrated the ability of the technique to capture trace species, the sensitivity ultimately depends upon the experimental configuration and background interference from other species with overlapping transitions. 2+2 radar REMPI measurements performed in molecular nitrogen were limited to densities at or above 10~(17)cm~(-3). This paper looks at methods for increasing the sensitivity of the technique. Near-field enhancement of the scattered signal was observed to produce a factor of 20 signal enhancement. However, this enhancement was found to be very sensitive to alignment and was difficult to achieve consistently. Alternatively, a double pass configuration was used and found to increase the signal level. Therefore, a multi-pass configuration has the potential for offering an increase in the sensitivity of the technique. This approach may be useful for measurements of trace species in an atmospheric flame, where remote detection is not required.
机译：雷达REMPI是一种很有前途的技术，可以替代其他激光诊断技术，例如激光诱导的荧光，拉曼散射或相干反斯托克斯拉曼散射。虽然在一氧化氮中的测量说明了该技术捕获痕量物质的能力，但灵敏度最终取决于实验配置和其他具有重叠过渡的物质的背景干扰。在分子氮中进行的2 + 2雷达REMPI测量仅限于10〜（17）cm〜（-3）或更高的密度。本文着眼于提高该技术敏感性的方法。观察到散射信号的近场增强产生了20倍的信号增强。然而，发现这种增强对对准非常敏感并且难以一致地实现。可替代地，使用双通配置并发现其增加了信号电平。因此，多通道配置具有提高技术灵敏度的潜力。该方法对于不需要远程检测的大气火焰中痕量物质的测量可能有用。

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