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

1999年，福岛饭馆安装了一套新的60厘米望远镜的行星光学观测系统。本研究的目的是利用该系统的红外光谱仪观测金星大气。2000年，利用黑体对傅里叶变换光谱仪(FT-IR)的InGaAs探测器的灵敏度进行了检测。对激光外差式光谱仪的声光光谱仪的对准进行了调整，以提高波数分辨率。2001年，在IATE设置了FT-IR，作为测试观测，测量了金星在0.9~1.7μm之间的光谱。在FT-IR上安装了波长大于2μm的新型InSb探测器。2002年9月至2003年1月，用FT-IR的InGAs探测器连续8天观测了金星大气。在11月29日、12月11日、14日和28日观测到了金星大气1.27μm处的O2排放。12月7日测量了木星光谱，探测到了木星大气对CH4的吸收。用InSb探测器也测量了金星光谱，但仪器在波长大于4μm处有很强的热发射，这种热发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.