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Proceedings Paper

Bottom-up laboratory testing of the DKIST Visible Broadband Imager (VBI)
Author(s): Andrew Ferayorni; Andrew Beard; Wes Cole; Scott Gregory; Friedrich Wöeger
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Paper Abstract

The Daniel K. Inouye Solar Telescope (DKIST) is a 4-meter solar observatory under construction at Haleakala, Hawaii [1]. The Visible Broadband Imager (VBI) is a first light instrument that will record images at the highest possible spatial and temporal resolution of the DKIST at a number of scientifically important wavelengths [2]. The VBI is a pathfinder for DKIST instrumentation and a test bed for developing processes and procedures in the areas of unit, systems integration, and user acceptance testing. These test procedures have been developed and repeatedly executed during VBI construction in the lab as part of a "test early and test often" philosophy aimed at identifying and resolving issues early thus saving cost during integration test and commissioning on summit.

The VBI team recently completed a bottom up end-to-end system test of the instrument in the lab that allowed the instrument’s functionality, performance, and usability to be validated against documented system requirements. The bottom up testing approach includes four levels of testing, each introducing another layer in the control hierarchy that is tested before moving to the next level. First the instrument mechanisms are tested for positioning accuracy and repeatability using a laboratory position-sensing detector (PSD). Second the real-time motion controls are used to drive the mechanisms to verify speed and timing synchronization requirements are being met. Next the high-level software is introduced and the instrument is driven through a series of end-to-end tests that exercise the mechanisms, cameras, and simulated data processing. Finally, user acceptance testing is performed on operational and engineering use cases through the use of the instrument engineering graphical user interface (GUI).

In this paper we present the VBI bottom up test plan, procedures, example test cases and tools used, as well as results from test execution in the laboratory. We will also discuss the benefits realized through completion of this testing, and share lessons learned from the bottoms up testing process.

Paper Details

Date Published: 16 August 2016
PDF: 13 pages
Proc. SPIE 9911, Modeling, Systems Engineering, and Project Management for Astronomy VI, 991106 (16 August 2016); doi: 10.1117/12.2233695
Show Author Affiliations
Andrew Ferayorni, National Solar Observatory (United States)
Andrew Beard, National Solar Observatory (United States)
Wes Cole, National Solar Observatory (United States)
Scott Gregory, National Solar Observatory (United States)
Friedrich Wöeger, National Solar Observatory (United States)


Published in SPIE Proceedings Vol. 9911:
Modeling, Systems Engineering, and Project Management for Astronomy VI
George Z. Angeli; Philippe Dierickx, Editor(s)

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