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Proceedings Paper

A new, fast, data acquisition system for the NPOI
Author(s): Matthew F. D. Brown; A. M. Jorgensen; T. Buschmann; D. J. Hutter; J. T. Armstrong
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Paper Abstract

A new hardware system is being implemented at The Navy Precision Optical Interferometer (NPOI) to vastly increase the data recording capabilities of the observatory. NPOI has three spectrographs each with 32 channels ranging the visible spectrum. Siderostat path lengths are modulated at 500 Hz strokes to create fringe patterns. The new system will be able to record and use all of the data generated, unlike the existing system. Utilizing parallel architecture of FPGA‟s, all channels are processed simultaneously and piped to a host computer via DMA such that an entire stroke‟s data is made available before the start of the next stroke. This is expected to increase the amount of scientific data from the NPOI by an order of magnitude over the current system. Furthermore, this data can also be used to provide feedback to the delay lines to close the fringe tracking loop. In this paper we discuss the hardware and software components of the new system and current progress.

Paper Details

Date Published: 12 September 2012
PDF: 6 pages
Proc. SPIE 8445, Optical and Infrared Interferometry III, 844530 (12 September 2012); doi: 10.1117/12.925918
Show Author Affiliations
Matthew F. D. Brown, New Mexico Institute of Mining and Technology (United States)
A. M. Jorgensen, New Mexico Institute of Mining and Technology (United States)
T. Buschmann, AZ Embedded Systems (United States)
D. J. Hutter, U.S. Naval Observatory (United States)
J. T. Armstrong, U.S. Naval Research Lab. (United States)

Published in SPIE Proceedings Vol. 8445:
Optical and Infrared Interferometry III
Françoise Delplancke; Jayadev K. Rajagopal; Fabien Malbet, Editor(s)

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