Alignment of four-mirror wide field corrector for the Hobby-Eberly Telescope

Oh, Chang Wan; Frater, Eric; Coyle, Laura; Dubin, Matthew; Lowman, Andrew E.; Zhao, Chunyu; Burge, James H.

doi:10.1117/12.2023427

Cited by 3 publications

(7 citation statements)

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“…Error refer_dec ¼ 0.05 mm: (7) Figure 26 depicts the mechanism reference installed on the pitch and azimuth axes. Figure 27 displays the procedure for calibrating the pitch axis using an auto-collimation theodolite.…”

Section: Azimuth and Pitch Axis Reference Establishmentmentioning

confidence: 99%

“…The configurations of optical systems come in a wide range, as do the related alignment techniques. [1][2][3][4][5][6][7][8][9][10][11][12] Laser trackers, theodolites, interferometers, coordinate measuring machine (CMM), and reference crosshairs are commonly used in precision assembly of large aperture telescopes. [1][2][3][4][5][6][7][8][9][10][11][12] Different types of telescopes have different optical systems and specialized assembly methods need to be developed based on the optical and structural characteristics.…”

Section: Introductionmentioning

confidence: 99%

“…Computer-generated holograms (CGH) can also be applied in the alignment process. 7 Oh et al have made the CGH as the reference to adjust the mirror's tilt and decenter to complete precise alignment. The details of various methods for assembling telescopes can be found in the literature.…”

Section: Introductionmentioning

confidence: 99%

“…The details of various methods for assembling telescopes can be found in the literature. [1][2][3][4][5][6][7][8][9][10][11][12] Based on the alignment methods of various optical systems, the following general methods are summarized. Laser trackers are commonly used for measuring and adjusting the spatial position of optical components.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Optical alignment technology for 1-meter accurate infrared magnetic system telescope

Fu,

Lei,

et al. 2024

J. Astron. Telesc. Instrum. Syst.

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Accurate infrared magnetic system (AIMS) is a ground-based solar telescope with the effective aperture of 1 m. The system has complex optical path and contains multiple aspherical mirrors. Since some mirrors are anisotropic in space, parallel light undergoes complex spatial reflection after passing through the optical pupil. It is also required that part of the optical axis coincides with the mechanical rotation axis. The system is difficult to align. This article proposes two innovative alignment methods. First, a modularized alignment method is presented. Each module is individually assembled with optical reference reserved. System integration can be completed through optical reference of each module. Second, computer-aided alignment technology is adopted to achieve perfect wavefront. By perturbing the secondary mirror (M2), the influence of M2 position on the wavefront is measured and the mathematical relationship is obtained. Based on the measured wavefront data, the least squares method is used to calculate the M2 alignment and multiple adjustments have been made to M2. The final system wavefront has reached RMS ¼ 0.12 λ@632.8 nm. Through observations of stars and sunspots, it has been demonstrated that the optical system has good wavefront quality. The observed sunspot is clear with the penumbral and umbra discernible. The proposed method has been verified and provides an effective alignment solution for complex off-axis telescope with large aperture.

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Section: Azimuth and Pitch Axis Reference Establishmentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Optical alignment technology for 1-meter accurate infrared magnetic system telescope

Fu,

Lei,

et al. 2024

J. Astron. Telesc. Instrum. Syst.

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show abstract

“…The requirement to survey large areas of sky with VIRUS plus the need to acquire wavefront sensing stars to provide full feedback on the tracker position led us to design a new corrector employing meter-scale aspheric mirrors and covering a 22-arcmin diameter field of view. The HET Wide Field Upgrade (WFU 6,7 ) deploys the wide field corrector (WFC 16,17 ), the new tracker 18 , prime focus instrument package (PFIP 19,20 ), and metrology systems [21][22][23] . The new corrector has improved image quality and a 10 m pupil diameter.…”

Section: The Hobby-eberly Telescope and Wide Field Upgradementioning

confidence: 99%

VIRUS: production and deployment of a massively replicated fiber integral field spectrograph for the upgraded Hobby-Eberly Telescope

et al. 2014

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The Visible Integral-field Replicable Unit Spectrograph (VIRUS) consists of a baseline build of 150 identical spectrographs (arrayed as 75 unit pairs) fed by 33,600 fibers, each 1.5 arcsec diameter, at the focus of the upgraded 10 m Hobby-Eberly Telescope (HET). VIRUS has a fixed bandpass of 350-550 nm and resolving power R~700. VIRUS is the first example of industrial-scale replication applied to optical astronomy and is capable of surveying large areas of sky, spectrally. The VIRUS concept offers significant savings of engineering effort, cost, and schedule when compared to traditional instruments.

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Development of a wide field spherical aberration corrector for the Hobby Eberly Telescope: design, fabrication and alignment

Frater

Lowman

et al. 2014

SPIE Proceedings

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Alignment of four-mirror wide field corrector for the Hobby-Eberly Telescope

Cited by 3 publications

References 0 publications

Optical alignment technology for 1-meter accurate infrared magnetic system telescope

Optical alignment technology for 1-meter accurate infrared magnetic system telescope

VIRUS: production and deployment of a massively replicated fiber integral field spectrograph for the upgraded Hobby-Eberly Telescope

Development of a wide field spherical aberration corrector for the Hobby Eberly Telescope: design, fabrication and alignment

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