Design Of A High-Resolution Fourier Transform Spectrometer

Byron A. Palmer; Rolf Engleman Jr.; Larry Testerman; James Brault

doi:10.1117/12.934742

7 November 1983 Design Of A High-Resolution Fourier Transform Spectrometer

Byron A. Palmer, Rolf Engleman Jr., Larry Testerman, James Brault

Proceedings Volume 0380, Los Alamos Conf on Optics '83; (1983) https://doi.org/10.1117/12.934742
Event: Los Alamos Conference on Optics, 1983, New Mexico, United States

Abstract

A unique high-resolution Fourier transform spectrometer is being designed for use at Los Alamos. The resolution will be between 0.001 and 0.002 cm^-1 and the spectral coverage will be from the ultraviolet to the infrared (200 nm to 20 μm). The design is based on an enhanced version of the instrument at Kitt Peak National Observatory. Our FTS will have twice the resolution and several innovations which will improve the speed and ease of use. The step size is variable with a resolution of 0.3 nm; this will eliminate the problems with aliasing caused by a fixed free spectral range. In addition, the scanning will be continuous; a total high-resolution scan will take 4 minutes. To improve the signal to noise ratio, multiple scans can be co-added. With this instrument we will be able to measure line positions to 3 MHz (0.0001 cm^-1) and intensities to better than 1% in selected cases. The design of this instrument is in the preliminary stages. The proposed performance specifications are given in Table I. Figure 1 is a system schematic which gives the major components of the system. There will be two Motorola 68000 microcomputers controlling the instrument, with one large host computer interfacing to the users. The cat's-eye reflectors replace the mirrors in a Michelson inteferometer and eliminate most of the problems with tilt in the mirrors because cat's-eye reflectors are insensitive to small changes in their orientation.

Citation Download Citation

Byron A. Palmer, Rolf Engleman Jr., Larry Testerman, and James Brault "Design Of A High-Resolution Fourier Transform Spectrometer", Proc. SPIE 0380, Los Alamos Conf on Optics '83, (7 November 1983); https://doi.org/10.1117/12.934742

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