Accession Number:
ADA478725
Title:
Initial Results From the USNO Dispersed Fourier Transform Spectrograph
Descriptive Note:
Journal article
Corporate Author:
NAVAL OBSERVATORY WASHINGTON DC
Personal Author(s):
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.
Descriptors:
Subject Categories:
- Numerical Mathematics
- Optical Detection and Detectors