Prototype Development for the GMT FSM Secondary - Off-axis Aspheric Mirror Fabrication -
A prototype of the GMT FSM has been developed to acquire and to enhance the key technology – mirror fabrication and tiptilt actuation. The ellipsoidal off-axis mirror has been designed, analyzed, and fabricated from light-weighting to grinding, polishing, and figuring of the mirror surface. The mi...
| Main Authors: | , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Korean Space Science Society (KSSS)
2014-12-01
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| Series: | Journal of Astronomy and Space Sciences |
| Subjects: | |
| Online Access: | http://ocean.kisti.re.kr/downfile/volume/kosss/OJOOBS/2014/v31n4/OJOOBS_2014_v31n4_341.pdf |
| Summary: | A prototype of the GMT FSM has been developed to acquire and to enhance the key technology – mirror fabrication and tiptilt
actuation. The ellipsoidal off-axis mirror has been designed, analyzed, and fabricated from light-weighting to grinding,
polishing, and figuring of the mirror surface. The mirror was tested by using an interferometer together with CGHs, which
revealed the surface error of 13.7 nm rms in the diameter of 1030 mm. The SCOTS test was employed to independently
validate the test results. It measured the surface error to be 17.4 nm rms in the diameter of 1010 mm. Both tests show the
optical surface of the FSMP mirror within the required value of 20 nm rms surface error. |
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| ISSN: | 2093-5587 2093-1409 |