2001 Fiscal Year Final Research Report Summary
Multi-object imaging spectroscopy with a multi-scan Fabry-Perot
| Project/Area Number |
10440062
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (B)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 一般 |
|---|
| Research Field |
Astronomy
|
|---|
| Research Institution | The University of Tokyo |
|---|
Principal Investigator |
DOI Mamoru Institute of Astronomy, The University of Tokyo, Associate Professor, 大学院・理学系研究科, 助教授 (00242090)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
SHIMASAKU Kazuhiro Department of Astronomy, The University of Tokyo, Assistant, 大学院・理学系研究科, 助手 (00251405)
OKAMURA Sadanori Department of Astronomy, The University of Tokyo, Professor, 大学院・理学系研究科, 教授 (20114423)
|
|---|
| Project Period (FY) |
1998 – 2000
|
| Keywords | Fabry Perot / imaging spectroscopy / astoronomical observation / multi-wavelength scan / etalon |
|---|
| Research Abstract |
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.
|
