Author

Hee-June Choi

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Oct 2026

Development of a multi-camera metrology system for closed-loop heliostat control

We present a six-camera optical metrology method for measuring heliostat misalignment from the decenter of reflected solar images at a receiver as a first step toward in-situ heliostat pose and shape control. We use three opposing camera pairs to measure differential irradiance and convert these measurements into the d...

D. Khim, H. Choi, J. Angel et al. · Optical Manufacturing and Te... · 0 citations

Review Jun 2026

Laser-based metrology systems versus wavefront sensing techniques: a comparative overview between the Large Binocular Telescope and the Vera C. Rubin Observatory for the telescope alignment and collimation tracking

This work presents a comparative overview of the collimation and alignment strategies employed by two leading 8m-class facilities: the Large Binocular Telescope (LBT) and the Vera C. Rubin Observatory. While both telescopes share a challenging fast f-number of approximately f/1.2 (considering the LBT in its Prime Focus...

L. Rosignoli, G. Rodeghiero, S. Thomas et al. · Astronomical Telescopes + In... · 1 citation

Open access Sep 2026

Writing quality, vocabulary learning, and reading comprehension in integrated reading-to-write tasks: A comparison of digital multimodal composing and traditional monomodal writing

Integrated reading-to-write tasks have been widely used to enhance second language (L2) learners’ writing skills and benefit other areas of L2 learning, such as reading and vocabulary. Although these benefits of integrated tasks have been widely investigated in traditional text-based monomodal writing, few studies have...

Hee-June Choi, Ying-Liang Liu, Youjin Kim · Studies in Second Language L... · 0 citations

Review Aug 2026

The path to agile extreme adaptive optics at the Large Binocular Telescope Observatory

The Large Binocular Telescope Observatory (LBTO) has pioneered major advancements in Adaptive Optics (AO) technologies, including the development of the adaptive secondary mirror (ASM), the pyramid wavefront sensor (PWFS), and ground-layer AO (GLAO) utilizing Rayleigh lasers for 8- to 10-meter class telescopes. We pres...

S. Ragland, J. C. Guerra, D. Caywood et al. · Astronomical Telescopes + In... · 3 citations

Preprint Jul 2026

Testing of machine learning wavefront sensing algorithms on the Tiny Observatory for Telescope Optimization (TOTO) testbed

Phase retrieval techniques are utilized to correct low order wavefront aberrations originating from misalignments of the optical system in space based telescope concepts. Traditional phase retrieval involves observation of the Point Spread Function (PSF) and a diversity measurement, usually focus diversity although oth...

Sanchit Sabhlok, Solvay A. Blomquist, Y. Maggie et al. · 0 citations