Simulation analysis of the photographic noncoincidence between fiber ends and light spots under integrating sphere light source

Juan Luo; Yonggang Gu; Ye Zhu; Chao Zhai

doi:10.1117/12.2311818

10 July 2018 Simulation analysis of the photographic noncoincidence between fiber ends and light spots under integrating sphere light source

Juan Luo, Yonggang Gu, Ye Zhu, Chao Zhai

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Proceedings Volume 10706, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III; 107064B (2018) https://doi.org/10.1117/12.2311818
Event: SPIE Astronomical Telescopes + Instrumentation, 2018, Austin, Texas, United States

Abstract

Fiber spectroscopic telescopes, such as LAMOST, require accurate alignment between the fiber ends and their corresponding celestial targets. In the measurement, the center of a light spot obtained through gray centroid method is regarded as the center of a fiber end. Nevertheless, we’ve observed that these two centers don’t coincide under wide visual angles when integrating sphere (Built in light source for bromine tungsten lamp) is used as light source. Basing on these phenomena we observed, this paper proposes a hypothesis that the maximum intensity of the light transmitted by the optical fiber to the end of the optical fiber is outside the end of the fiber. The intensity distribution at the output end of fibers under integrating sphere light source is simulated in this study. Keywords: accurate alignment

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Juan Luo, Yonggang Gu, Ye Zhu, and Chao Zhai "Simulation analysis of the photographic noncoincidence between fiber ends and light spots under integrating sphere light source", Proc. SPIE 10706, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III, 107064B (10 July 2018); https://doi.org/10.1117/12.2311818

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KEYWORDS

Light sources

Optical fibers

Light

Integrating spheres

Lamps

Bromine

Tungsten

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