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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 35, Iss. 16 — Jun. 1, 1996
  • pp: 2891–2896

New approach to high-precision Fourier transform spectrometer design

James W. Brault  »View Author Affiliations


Applied Optics, Vol. 35, Issue 16, pp. 2891-2896 (1996)
http://dx.doi.org/10.1364/AO.35.002891


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Abstract

Laser fringes have long been used to establish the x axis in interferometric spectrometry, but solutions for the intensity axis have been less satisfactory. Now we are seeing the rapid commercial development of low-cost, medium-speed, sigma–delta analog-to-digital converters developed for stereo audio applications. A single chip provides two channels of 20-bit precision at 50 kHz, a significant improvement over many current systems of much greater cost and complexity. But while the laser works in the spatial domain, this converter operates strictly in the time domain; it cannot be triggered. I have developed a bridge between these two domains, the adaptive digital filter, which not only permits us to use this converter to obtain measurements at arbitrary times but as a bonus shows us how to move much of the complexity of an interferometric-control and data-acquisition system from hardware to software. For example, flexible fringe subdivision (to increase the free spectral range) is easily obtained with a simple and efficient algorithm, completely free of laser ghosts. Compensation for drive velocity variation is also possible, requiring only a modest increase in computer memory.

© 1996 Optical Society of America

History
Original Manuscript: November 6, 1995
Revised Manuscript: February 16, 1996
Published: June 1, 1996

Citation
James W. Brault, "New approach to high-precision Fourier transform spectrometer design," Appl. Opt. 35, 2891-2896 (1996)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-35-16-2891

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