The alignment and phasing system for the Thirty Meter Telescope: risk mitigation and status update

Troy, Mitchell; Chanan, G. A.; Michaels, Scott; Dekens, Frank; Hein, Randy; Herzig, Sebastian J. I.; Karban, Robert; Nissly, Carl; Roberts, J. T.; Rud, Michael; Seo, Byoung-Joon

doi:10.1117/12.2231913

Cited by 4 publications

(5 citation statements)

References 4 publications

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“…Researchers are trying to use it for telescope control software for ground-based and space-based observations (Park et al 2022). The software system of the TMT consists of a software infrastructure called TMT Common Software (CSW) (Gillies et al 2020) that interact with each other to satisfy the function of the various parts of the telescope, such as the pointing and tracking system and Alignment and Phasing System (APS) (Troy et al 2016).…”

Section: Introductionmentioning

confidence: 99%

Large-aperture Telescope Tracking Control Based on Time-synchronization Strategy

Li,

Ye,

Yang

et al. 2024

Res. Astron. Astrophys.

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A time-synchronization strategy for packetized transmission of target position about large-aperture telescope observation control system has been proposed in this study. Compared with the existing telescope tracking strategy, the target position packing and sending strategy based on the time synchronization method proposed in this paper has the advantages of high stability and reliability. Firstly, the telescope tracking observation control method was elaborated in this paper, including the motion pattern during telescope tracking. Then, the strategy for packetizes transmission of target positions based on time-synchronization is established and lists the detailed steps. Finally, the performance of the tracking strategy is verified using the 2.5m telescope for the simulated uniform speed star and the blind-tracking fixed star HIP31216, respectively. The test results show that the accuracy RMS of the tracking strategy proposed in this paper is less than 0.02" at 30 minutes, and the performance is much better than the design requirement of 0.3". The most important advantage of this tracking strategy is that the telescope can guarantee normal tracking for a certain period of time even if the hardware or software of the host computer is abnormal.

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Section: Introductionmentioning

confidence: 99%

Large-aperture Telescope Tracking Control Based on Time-synchronization Strategy

Li,

Ye,

Yang

et al. 2024

Res. Astron. Astrophys.

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“…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%

“…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%

“… – 12 Laser trackers, theodolites, interferometers, coordinate measuring machine (CMM), and reference crosshairs are commonly used in precision assembly of large aperture telescopes 1 – 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%

“…The authors use a contact micrometer to control the eccentricity and tilt of each lens and finally applies an off-axis laser beam to perform system alignment. For the Thirty Meter Telescope, 5 alignment and phasing system is employed for optical alignment, which is successful applied in the Keck telescope. Jovis Amorum Ac Natorum Undique Scrutator (JANUS) also has its unique alignment method 6 .…”

Section: Introductionmentioning

confidence: 99%

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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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Precision Optics Manufacturing and Control for Next-Generation Large Telescopes

et al. 2019

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The alignment and phasing system for the Thirty Meter Telescope: risk mitigation and status update

Cited by 4 publications

References 4 publications

Large-aperture Telescope Tracking Control Based on Time-synchronization Strategy

Large-aperture Telescope Tracking Control Based on Time-synchronization Strategy

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

Precision Optics Manufacturing and Control for Next-Generation Large Telescopes

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