Sensitivity analysis of a wide-field telescope
- 100 Downloads
We are developing three ground-based wide-field telescopes. A wide-field Cassegrain telescope consists of two hyperbolic mirrors, aberration correctors and a field flattener for a 2-degree field of view. The diameters of the primary mirror and the secondary mirror are 500 mm and 200 mm, respectively. Corrective optics combined with four lenses, a filter and a window are also considered. For the imaging detection device, we use a charge coupled device (CCD) which has a 4096 × 4096 array with a 9-µm2 pixel size. One of the requirements is that the image motion limit of the opto-mechanical structure be less than 1 pixel size of the CCD on the image plane. To meet this requirement, we carried out an optical design evaluation and a misalignment analysis. Line-of-sight sensitivity equations are obtained from the rigid-body rotation in three directions and the rigid-body translation in three directions. These equations express the image motions at the image plane in terms of the independent motions of the optical components. We conducted a response simulation to evaluate the finite element method models under static load conditions, and the result is represented by the static response function. We show that the wide-field telescope system is stiff and stable enough to be supported and operated during its operating time.
KeywordsWide-field optics Optical design/analysis Finite element method Sensitivity equation
Unable to display preview. Download preview PDF.
- J. H. Lee, Y-S. Jung, S-Y. Ryoo and Y-J. Kim, J. Optical Soc. Korea 15, 2 (2011).Google Scholar
- Siemens Product Lifecycle Management Software Inc., NX Nastran Basic Dynamic Analysis User’s Guide, 2008.Google Scholar
- Kodak Company, KAF-16801 Image sensor — Device performance specification, 2010.Google Scholar
- V. J. Wagner, R. Malnory and K. S. Ellis, in Proceedings of the Conference of MSC 1998 America Users’ Conference (Los Angeles, CA, October 5–9, 1998), Paper No. 2198.Google Scholar
- P. Yoder, Opto-mechanical Systems Design, 2nd edition (Marcel Dekker, New York, 1993), Chapter 3.Google Scholar
- H. Himelblau, D. L. Kern, J. E. Manning, A. G. Piersol and S. Rubin, Report, NASA-HDBK-7005, 2001.Google Scholar