We demonstrate measurements of OH absorption spectra in the post-flame zone of a McKenna burner using spatial heterodyne spectroscopy (SHS). SHS permits high-resolution, high-throughput measurements. In this case the spectra span approx308-310 nm with a resolution of 0.03 nm, even though an extended source (extent of approx2 X 10~(-7) m~(2) rad~(2)) was used. The high spectral resolution is important for interpreting spectra when multiple absorbers are present for inferring accurate gas temperatures from measured spectra and for monitoring weak absorbers. The present measurement paves the way for absorption spectroscopy by SHS in practical combustion devices, such as reciprocating and gas-turbine engines.
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机译：我们展示了使用空间外差光谱（SHS）在McKenna燃烧器的后火焰区域中OH吸收光谱的测量。 SHS允许高分辨率，高通量测量。在这种情况下，即使使用扩展光源（范围大约为2 X 10〜（-7）m〜（2）rad〜（2）），光谱范围约为308-310 nm，分辨率为0.03 nm。当存在多个吸收器时，高光谱分辨率对于解释光谱非常重要，以便从测得的光谱中推断出准确的气体温度并监测弱吸收器。本次测量为诸如往复式和燃气轮机之类的实际燃烧设备中的SHS吸收光谱法铺平了道路。
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