Large survey camera collimation and alignment at the observation site by curvature sensing

An, Qichang; Wu, Xiaoxia; Lin, Xudong; Wang, Jianli; Chen, Tao; Zhang, Jingxu; Li, Hongwen; Wang, Liang; Liu, Yansen

doi:10.1016/j.ijleo.2021.167273

Cited by 2 publications

(2 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Firstly, wavefront curvature sensing has been studied in previous work [18]. Then, the experimental set up is similar to the simulation case in Figure 3.…”

Section: Experimental Verificationmentioning

confidence: 99%

Photonics Large-Survey Telescope Internal Motion Metrology System

Zhang

et al. 2023

Photonics

Self Cite

View full text Add to dashboard Cite

Large survey telescopes are vital for mapping dark energy and dark matter in the deep universe. This study presents a fiber-linked internal motion metrology system that aligns the mirrors and large lenses in the telescopes to enhance alignment accuracy by improving the image quality at a lower weight, volume, power, and cost. The internal motion system comprises a photonic laser beam projector capable of projecting multiple Gaussian beams onto the detector of the telescope. The specific spatial frequency aberration component is determined by combining Gaussian beam location and the geometry model of the telescope. Furthermore, integrating the proposed system with the curvature-sensing wavefront system enables more precise alignment and camera sensing. In the experimental tests, the location precision was within 10 μm, and the rotation precision improved to 5 arcsecs, fulfilling the alignment and motion monitoring requirements of large survey telescopes. The results of this study can be used as a reference to improve the performance of closed-loop bandwidth systems and active camera optics.

show abstract

“…Firstly, wavefront curvature sensing has been studied in previous work [18]. Then, the experimental set up is similar to the simulation case in Figure 3.…”

Section: Experimental Verificationmentioning

confidence: 99%

Photonics Large-Survey Telescope Internal Motion Metrology System

Zhang

et al. 2023

Photonics

Self Cite

View full text Add to dashboard Cite

show abstract

“…The corresponding solutions based on single exit pupil measurements are prone to matrix ill-conditioning and fail to detect pupil alignment. In addition, methods based on additional wavefront sensors or reflective targets require light splitting or can only be aimed at a specific optical path [13], [14], [15], [16].…”

Section: Introductionmentioning

confidence: 99%

Curvature Sensing-Based Pupil Alignment Method for Large-Aperture Telescopes

Zhang

et al. 2023

IEEE Photonics J.

Self Cite

View full text Add to dashboard Cite

In optical systems, pupil alignment is an important component of wavefront sensing, closed-loop feedback, and imaging vignetting control because it directly affects the detection limit of the system and thus the realization of scientific goals. This study proposes the use of the energy transfer characteristics of the pupil edge to determine the misalignment of each pupil. The mechanism involves decoupling the influence of each pupil from the final exit pupil energy distribution by using aperture coding without the addition of other optical paths. The degree to which the pupil is aligned is characterized by the normalized point source sensitivity (PSSn). The pupil misalignment PSSn increased from 0.75 to 0.83. The results of this study can be used to perform tomographic detection of pupil alignment and obtain high-quality telescopic images.

show abstract

Large survey camera collimation and alignment at the observation site by curvature sensing

Cited by 2 publications

References 13 publications

Photonics Large-Survey Telescope Internal Motion Metrology System

Photonics Large-Survey Telescope Internal Motion Metrology System

Curvature Sensing-Based Pupil Alignment Method for Large-Aperture Telescopes

Contact Info

Product

Resources

About