Initial Results From the USNO Dispersed Fourier Transform Spectrograph
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 25, 2007
- Accession Number
- ADA478725
Entities
People
- Andrew T. Cenko
- Arsen R. Hajian
- Bradford B. Behr
- Brian Pohl
- David Mozurkewich
- J. T. Armstrong
- Kevin H. Knuth
- Robert B. Hindsley
- Robert P. Olling
- Sevan Petrossian
Organizations
- United States Naval Observatory