Sensitivity and tolerance analysis of 2D Profilometer for TMT primary mirror segments
- Title
- Sensitivity and tolerance analysis of 2D Profilometer for TMT primary mirror segments
- Creator
- Valsan V.; Sriram S.; Basheer A.; Varadhachari J.; Anupama G.C.
- Description
- The primary mirror (M1) of Thirty Meter Telescope (TMT) consists of 492 segments of which, 86 are ground and polished by India-TMT. These segments are off-Axis and aspheric in nature and one of the effective methods to polish such segments is through Stressed Mirror Polishing (SMP). During SMP, consistent in-situ metrology of the surface is needed to achieve the required profile. A 2D Profilometer (2DP) will be used by India-TMT for the low frequency profile metrology. The 2DP is a contact-Approach metrology, consisting of probes positioned in a spiral pattern, measuring the sag of segment surface. Initial section of this paper deals with the sensitivity and tolerance analysis of the 2DP. This is followed by the study on position and rotational errors of the 2DP as a whole. Simulation of these analysis is carried out initially on a sphere and then on different segments of the TMT, in order to study the induced measurement errors. COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.
- Source
- Proceedings of SPIE - The International Society for Optical Engineering, Vol-10742
- Date
- 2018-01-01
- Publisher
- SPIE
- Subject
- Large optics; Optical Profilometry; Thirty Meter Telescope
- Coverage
- Valsan V., CHRIST(Deemed to Be University), Hosur Road, Bengaluru, 560029, India, Indian Institute of Astrophysiscs, II Block, Koramangala, Bengaluru, 560034, India; Sriram S., Indian Institute of Astrophysiscs, II Block, Koramangala, Bengaluru, 560034, India; Basheer A., Indian Institute of Astrophysiscs, II Block, Koramangala, Bengaluru, 560034, India; Varadhachari J., Indian Institute of Astrophysiscs, II Block, Koramangala, Bengaluru, 560034, India; Anupama G.C., Indian Institute of Astrophysiscs, II Block, Koramangala, Bengaluru, 560034, India
- Rights
- Restricted Access
- Relation
- ISSN: 0277786X; ISBN: 978-151062055-1; CODEN: PSISD
- Format
- Online
- Language
- English
- Type
- Conference paper
Collection
Citation
Valsan V.; Sriram S.; Basheer A.; Varadhachari J.; Anupama G.C., “Sensitivity and tolerance analysis of 2D Profilometer for TMT primary mirror segments,” CHRIST (Deemed To Be University) Institutional Repository, accessed April 11, 2025, https://archives.christuniversity.in/items/show/20905.