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首页> 外文会议>Conference on Sensors, Systems, and Next-Generation Satellites VI Sep 23-26, 2002 Agia Pelagia, Crete, Greece >Slitfunction measurement optical stimulus
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Slitfunction measurement optical stimulus

机译：狭缝功能光学刺激

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摘要

For the calibration of OMI ( = Ozone Monitoring Instrument, to be launched in 2004 on the NASA EOS-AURA satellite ) a slitfunction measurement stimulus has been developed. The slitfunction is the monochromatic image of the entrance slit of the spectrometer on the detector. Accurate knowledge of this slitfunction for all wavelengths and field angles is very important both for the spectral calibration and for the DOAS ( = Differential Optical Absorbtion Spectroscopy ) retrieval algorithm. Determination of this function with a spectral line source is inaccurate, because of the detector resolution and incomplete, because of the limited number of discrete spectral lines, that are available. For accurate and complete measurement of the slitfunction an echelle monochromator has been developed, that offers a number of spectral lines, that can be scanned with a small wavelength step over the entire spectral range of OMI ( 270 ― 500 nm ). The spectral bandwidth of these lines ( FWHM ) is about 0.1 x the spectral resolution of OMI and the wavelength step during scanning is even smaller. The wavelength scanning is performed by accurate rotation of the echelle. In this paper the scientific background of the slitfunction measurement, the stimulus and first OMI slitfunction calibration measurements are described.
机译：为了校准OMI（将于2004年在NASA EOS-AURA卫星上发射的臭氧监测仪），已经开发了狭缝功能测量刺激。狭缝功能是光谱仪入口狭缝在探测器上的单色图像。对于所有波长和视场角，此狭缝函数的准确知识对于光谱校准和DOAS（差分光学吸收光谱）检索算法都非常重要。由于检测器的分辨率，并且由于可用的离散光谱线数量有限，因此使用光谱线源确定此功能是不准确的。为了精确，完整地测量狭缝功能，已经开发了阶梯式单色仪，它提供了许多光谱线，可以在OMI的整个光谱范围（270-500 nm）内以较小的波长步进进行扫描。这些线的光谱带宽（FWHM）约为OMI光谱分辨率的0.1倍，并且扫描过程中的波长步长更小。波长扫描是通过echelle的精确旋转来执行的。本文介绍了狭缝功能测量，刺激和首次OMI狭缝功能校准测量的科学背景。

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