Ground-based infrared measurements of the Venus atmosphere with a Fourier transform spectrometer and a laser heterodyne spectrometer

1999年在福岛的Iitate安装了一个新的行星光学观测系统，配备60厘米望远镜。2000年用黑体法对傅里叶变换光谱仪（FT-IR）的InGaAs探测器的灵敏度进行了检验。2001年，在Iitate进行了FT-IR实验，对金星0.9 ~ 1.7 μm的光谱进行了测试观测。2002年9月至2003年1月，在金星大气中安装了波长大于2 μm的新型InSb探测器，对金星大气进行了为期8天的观测。在11月29日、12月11日、14日和28日观测了金星大气1.27 μm处的O_2释放。12月7日观测了木星光谱，并探测到木星大气CH_4的吸收。用InSb探测器也测量了金星光谱，但在波长大于4μm时，仪器有很强的热辐射。这种热辐射应该用滤光片或其他方法来减少。

A new optical observation system for planets with 60 cm telescope was installed in Iitate, Fukushima in 1999. The purpose of this study is to observe Venus atmosphere with the infrared spectrometers of this system.In 2000, the sensitivity of the InGaAs detector of the Fourier transform spectrometer (FT-IR) was checked using black body. The alignment of the acousto-optical spectrometer of the laser heterodyne spectrometer was adjusted to improve the wavenumber resolution.In 2001, FT-IR was set at Iitate and the spectra of the Venus between 0.9 and 1.7 μm were measured as a test observation. A new InSb detector for longer wavelength than 2 μm were installed to the FT-IR.In 2002, Venus atmosphere was observed with InGaAs detector of FT-IR on 8 days from September 2002 to January 2003. O_2 emission of Venus atmosphere at 1.27 μm were detected on November 29, December 11, 14, and 28. Jupiter spectrum were measured on December 7 and CH_4 absorption of Jupiter atmosphere were detected. Venus spectrum were also measured with InSb detector but there was strong thermal emission of the instruments at wavelength longer than 4μm. This thermal emission should be reduced with optical filter or some other methods.