Mr. Chuang Li Profile

Chuang Li

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Proceedings Article | 16 November 2011 Paper

Deployment precision measurement modeling of a deployable space telescope based on tape springs

Chuang Li, Xuegui Feng

Proceedings Volume 8321, 83212R (2011) https://doi.org/10.1117/12.905134

KEYWORDS: Mirrors, Space telescopes, Semiconductor lasers, Telescopes, Precision measurement, Mirror structures, James Webb Space Telescope, Sensors, Imaging systems, Laser systems engineering

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Tape springs have many advantages to develop spaced-based deployable systems because of their simple structures, light weights, high stiffness, and the abilities of self-deploy and self-lock. Their applications in deployable space structures make the spaced-based systems fulfill the requirements of light weight and compact launching volume. A new kind of deployable space telescope under research uses tape springs as the support structure of secondary mirror. Before launch, the support structure of secondary mirror is folded, and deployed when on orbit. In order to achieve near diffraction limited imaging quality, the deployment precision must reach the level consistent with the optical compensation system. We designed an accurate measuring system based on position sensitive detectors (PSDs) to measure the deployment precision. The measuring system includes 3 laser diodes, 3 two-dimensional PSDs around the primary mirror of the deployable telescope, and 3 small mirrors around the secondary mirror. The equations linking the PSD readings and the six-degree-of-freedom displacement of the secondary mirror were deduced. With these equations, the deployment errors can be resolved.

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