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Multi-object imaging spectroscopy with a multi-scan Fabry-Perot

使用多扫描法布里-珀罗的多目标成像光谱

基本信息

批准号：
10440062
负责人：
DOI Mamoru
金额：
$ 8.64万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 2000
项目状态：
已结题

项目摘要

This research is to show that a multi-scanning Fabry-Perot imaging spectrograph for more than 10 different wavelength ranges can be used for astronomical observations. We used a liquid crystal etalon for the basic part of the Fabry Perot, while etalons with mechanical drives are more popular in astronomy. A liquid crystal etalon is more stable compared with a mechanical one especially against temperature variation and mechanical vibrations. A liquid crystal etalon is also inexpensive. We evaluated an etalon with our own evaluation apparatus, and showed that our wide-wavelength coverage etalon has finesse of 12 or larger which meets our specifications., while the transparency of the etalon is not very high. We also confirmed that the etalon is easy to maintain. The reason for small transparency is that we used only one etalon to cover the wavelength range which we intended to cover with two etalons. This is mainly because of our limited budget. Since the wavelength coverage for a etalon became large, it was difficult to make coating with constant reflectivity for the wavelength range. But the etalon was useful enough to try to make a multi-scanning Fabty-Perot imaging spectrograph. We modified a dichroic-mirror camera so that we can use it with the etalon. In order to carry out real astronomical observations, we need narrow-band filters. But The selection of the filters can be made for each scientific topic, which we can carry out in future.

本研究的目的是证明一台可在10个以上不同波长范围内进行多扫描的法布里-珀罗成像光谱仪可用于天文观测。我们使用液晶标准具作为法布里-珀罗的基本部分，而机械驱动的标准具在天文学中更受欢迎。液晶标准具与机械标准具相比更稳定，特别是对于温度变化和机械振动。液晶标准具也是廉价的。我们用自己的评价装置对标准具进行了评价，结果表明，我们的宽波长覆盖标准具具有12或更大的精细度，符合我们的规格。而标准具的透明度不是很高。我们还证实了标准具易于维护。透明度小的原因是我们只使用了一个标准具来覆盖我们打算用两个标准具覆盖的波长范围。这主要是因为我们的预算有限。由于标准具的波长覆盖范围变大，因此很难使涂层在波长范围内具有恒定的反射率。但是标准具足够有用，可以尝试制造多扫描Fabty-Perot成像光谱仪。我们改进了一个二向色镜照相机，这样我们就可以和标准具一起使用了。为了进行真实的天文观测，我们需要窄带滤光片。但是，过滤器的选择可以为每个科学主题，我们可以在未来进行。