Accession Number:

ADA478725

Title:

Initial Results From the USNO Dispersed Fourier Transform Spectrograph

Descriptive Note:

Journal article

Corporate Author:

NAVAL OBSERVATORY WASHINGTON DC

Report Date:

2007-01-25

Pagination or Media Count:

19.0

Abstract:

We have designed and constructed a dispersed Fourier transform spectrometer dFTS, consisting of a conventional FTS followed by a grating spectrometer. By combining these two devices,we negate a substantial fraction of the sensitivity disadvantage of a conventional FTS for high-resolution, broadband, optical spectroscopy, while preserving many of the advantages inherent to interferometric spectrometers. In addition, we have implemented a simple and inexpensive laser metrology system, which enables very precise calibration of the interferometer wavelength scale. The fusion of interferometric and dispersive technologies with a laser metrology system yields an instrument well suited to stellar spectroscopy, velocimetry, and extrasolar planet detection, which is competitive with existing high-resolution, high-accuracy stellar spectrometers. In this paper we describe the design of our prototype dFTS, explain the algorithm we use to efficiently reconstruct a broadband spectrum from a sequence of narrowband interferograms, and present initial observations and resulting velocimetry of stellar targets.

Subject Categories:

  • Numerical Mathematics
  • Optical Detection and Detectors

Distribution Statement:

APPROVED FOR PUBLIC RELEASE