Upgrade of the HET segment control system, utilizing state-of-The-Art, decentralized and embedded system controllers

Marco Haeuser, Josef Richter, Herman Kriel, Amanda Turbyfill, Brent Buetow, Michael Ward

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Together with the ongoing major instrument upgrade of the Hobby-Eberly Telescope (HET) we present the planned upgrade of the HET Segment Control System (SCS) to SCS2. Because HET's primary mirror is segmented into 91 individual 1-meter hexagonal mirrors, the SCS is essential to maintain the mirror alignment throughout an entire night of observations. SCS2 will complete tip, tilt and piston corrections of each mirror segment at a significantly higher rate than the original SCS. The new motion control hardware will further increase the system's reliability. The initial optical measurements of this array are performed by the Mirror Alignment Recovery System (MARS) and the HET Extra Focal Instrument (HEFI). Once the segments are optically aligned, the inductive edge sensors give sub-micron precise feedback of each segment's positions relative to its adjacent segments. These sensors are part of the Segment Alignment Maintenance System (SAMS) and are responsible for providing information about positional changes due to external inuences, such as steep temperature changes and mechanical stress, and for making compensatory calculations while tracking the telescope on sky. SCS2 will use the optical alignment systems and SAMS inputs to command corrections of every segment in a closed loop. The correction period will be roughly 30 seconds, mostly due to the measurement and averaging process of the SAMS algorithm. The segment actuators will be controlled by the custom developed HET Segment MOtion COntroller (SMOCO). It is a direct descendant of University Observatory Munich's embedded, CAN-based system and instrument control tool-kit. To preserve the existing HET hardware layout, each SMOCO will control two adjacent mirror segments. Unlike the original SCS motor controllers, SMOCO is able to drive all six axes of its two segments at the same time. SCS2 will continue to allow for sub-Arcsecond precision in tip and tilt as well as sub-micro meter precision in piston. These estimations are based on the current performance of the segment support mechanics. SMOCO's smart motion control allows for on-The-y correction of the move targets. Since SMOCO uses state-of-The-Art motion control electronics and embedded decentralized controllers, we expect reduction in thermal emission as well as less maintenance time.

Original languageEnglish (US)
Title of host publicationGround-Based and Airborne Telescopes VI
EditorsHeather K. Marshall, Helen J. Hall, Roberto Gilmozzi
PublisherSPIE
Volume9906
ISBN (Electronic)9781510601918
DOIs
StatePublished - Jan 1 2016
EventGround-Based and Airborne Telescopes VI - Edinburgh, United Kingdom
Duration: Jun 26 2016Jul 1 2016

Other

OtherGround-Based and Airborne Telescopes VI
CountryUnited Kingdom
CityEdinburgh
Period6/26/167/1/16

Fingerprint

Hobby-Eberly Telescope
Embedded systems
Telescopes
Embedded Systems
Decentralized
controllers
Control System
telescopes
Mirrors
Control systems
Controller
Controllers
Motion control
Pistons
Mirror
alignment
Hardware
Plant layout
Alignment
Sensors

Keywords

  • Active optic
  • Can based array control
  • Decanic
  • Electronics minimazation
  • Het scs2
  • Microcontroller based motion control
  • Multi object spectrograph facility
  • Smoco

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

Cite this

Haeuser, M., Richter, J., Kriel, H., Turbyfill, A., Buetow, B., & Ward, M. (2016). Upgrade of the HET segment control system, utilizing state-of-The-Art, decentralized and embedded system controllers. In H. K. Marshall, H. J. Hall, & R. Gilmozzi (Eds.), Ground-Based and Airborne Telescopes VI (Vol. 9906). [990602] SPIE. https://doi.org/10.1117/12.2232410

Upgrade of the HET segment control system, utilizing state-of-The-Art, decentralized and embedded system controllers. / Haeuser, Marco; Richter, Josef; Kriel, Herman; Turbyfill, Amanda; Buetow, Brent; Ward, Michael.

Ground-Based and Airborne Telescopes VI. ed. / Heather K. Marshall; Helen J. Hall; Roberto Gilmozzi. Vol. 9906 SPIE, 2016. 990602.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Haeuser, M, Richter, J, Kriel, H, Turbyfill, A, Buetow, B & Ward, M 2016, Upgrade of the HET segment control system, utilizing state-of-The-Art, decentralized and embedded system controllers. in HK Marshall, HJ Hall & R Gilmozzi (eds), Ground-Based and Airborne Telescopes VI. vol. 9906, 990602, SPIE, Ground-Based and Airborne Telescopes VI, Edinburgh, United Kingdom, 6/26/16. https://doi.org/10.1117/12.2232410
Haeuser M, Richter J, Kriel H, Turbyfill A, Buetow B, Ward M. Upgrade of the HET segment control system, utilizing state-of-The-Art, decentralized and embedded system controllers. In Marshall HK, Hall HJ, Gilmozzi R, editors, Ground-Based and Airborne Telescopes VI. Vol. 9906. SPIE. 2016. 990602 https://doi.org/10.1117/12.2232410
Haeuser, Marco ; Richter, Josef ; Kriel, Herman ; Turbyfill, Amanda ; Buetow, Brent ; Ward, Michael. / Upgrade of the HET segment control system, utilizing state-of-The-Art, decentralized and embedded system controllers. Ground-Based and Airborne Telescopes VI. editor / Heather K. Marshall ; Helen J. Hall ; Roberto Gilmozzi. Vol. 9906 SPIE, 2016.
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abstract = "Together with the ongoing major instrument upgrade of the Hobby-Eberly Telescope (HET) we present the planned upgrade of the HET Segment Control System (SCS) to SCS2. Because HET's primary mirror is segmented into 91 individual 1-meter hexagonal mirrors, the SCS is essential to maintain the mirror alignment throughout an entire night of observations. SCS2 will complete tip, tilt and piston corrections of each mirror segment at a significantly higher rate than the original SCS. The new motion control hardware will further increase the system's reliability. The initial optical measurements of this array are performed by the Mirror Alignment Recovery System (MARS) and the HET Extra Focal Instrument (HEFI). Once the segments are optically aligned, the inductive edge sensors give sub-micron precise feedback of each segment's positions relative to its adjacent segments. These sensors are part of the Segment Alignment Maintenance System (SAMS) and are responsible for providing information about positional changes due to external inuences, such as steep temperature changes and mechanical stress, and for making compensatory calculations while tracking the telescope on sky. SCS2 will use the optical alignment systems and SAMS inputs to command corrections of every segment in a closed loop. The correction period will be roughly 30 seconds, mostly due to the measurement and averaging process of the SAMS algorithm. The segment actuators will be controlled by the custom developed HET Segment MOtion COntroller (SMOCO). It is a direct descendant of University Observatory Munich's embedded, CAN-based system and instrument control tool-kit. To preserve the existing HET hardware layout, each SMOCO will control two adjacent mirror segments. Unlike the original SCS motor controllers, SMOCO is able to drive all six axes of its two segments at the same time. SCS2 will continue to allow for sub-Arcsecond precision in tip and tilt as well as sub-micro meter precision in piston. These estimations are based on the current performance of the segment support mechanics. SMOCO's smart motion control allows for on-The-y correction of the move targets. Since SMOCO uses state-of-The-Art motion control electronics and embedded decentralized controllers, we expect reduction in thermal emission as well as less maintenance time.",
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