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首页> 外文期刊>International Journal of Heat and Mass Transfer >Measurement of soot optical properties in the near-infrared spectrum
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Measurement of soot optical properties in the near-infrared spectrum

机译：在近红外光谱中测量烟灰光学性质

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The dimensionless extinction constant, Ke, was measured using the NIST Large Agglomerate Optics Facility (LAOF) for soot produced from acetylene and ethene flames. Measurements were performed simultaneously using light sources at 632.8 and 856 nm. The experiments at 856 nm represent the longest wavelength for which accurate extinction measurements have been performed for soot. The mean values of present measurements of Ke at 632.8 nm for the acetylene and ethene soot are 8.l2 ± 0.59 and 9.65 ± 0.54, respectively. For acetylene, the mean value of Ke measured at 856 nm was 8.83 ± 0.69, whereas the mean value for ethene at the same wavelength was 9.35 ± 0.5l. The reduction in discrepancy for the fuels between 632.8 and 856 nm may be related to beam shielding effects. As in the case of 632.8 nm, the measured Ke values for 856 nm are significantly larger than values calculated using traditional methods. The present measurements provide a more reliable value of Ke for use in optical-based soot diagnostics.
机译：使用NIST大型团聚光学设备（LAOF）测量由乙炔和乙烯火焰产生的烟灰的无量纲消光常数Ke。使用632.8和856 nm的光源同时进行测量。 856 nm处的实验代表最长的波长，已对烟灰进行了精确的消光测量。目前，乙炔和乙烯烟灰在632.8 nm处Ke的测量平均值分别为8.12±0.59和9.65±0.54。对于乙炔，在856 nm处测得的Ke平均值为8.83±0.69，而在相同波长下的乙烯平均值为9.35±0.5l。燃料在632.8和856 nm之间的差异减少可能与光束屏蔽效果有关。如在632.8 nm的情况下，测得的856 nm的Ke值明显大于使用传统方法计算的值。当前的测量值提供了更可靠的Ke值，可用于基于光学的烟尘诊断。

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