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Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 44, Iss. 4 — Apr. 1, 1954
  • pp: 264–269

Electronic Fringe Interpolator for an Optical Interferometer

R. D. HUNTOON, ALBERT WEISS, and WRAY SMITH  »View Author Affiliations

JOSA, Vol. 44, Issue 4, pp. 264-269 (1954)

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An electronic fringe counter for use with optical interferometers is described. Provision is made for automatic counting of integral fringes, interpolation to within 1/200 wavelength or approximately 10-7 inch, and indication of the direction of motion of the interferometer plates. Automatic interpolation is achieved by vibrating one plate of the interferometer and analyzing the resulting ac signals from a photomultiplier exposed to a portion of the fringes in the image plane of the optical system. The use of an ac analyzer eliminates troublesome dc drifts associated with photoelectronic circuits and provides an oscilloscope display of the phase progression from fringe to fringe.

R. D. HUNTOON, ALBERT WEISS, and WRAY SMITH, "Electronic Fringe Interpolator for an Optical Interferometer," J. Opt. Soc. Am. 44, 264-269 (1954)

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  1. A somewhat similar nonvibrating system using two separate photomultiplier channels has been developed by E. Root, Jr. (private communication). See also Harrison, Jacobsen, and Camus J. Opt. Soc. Am. 40, 800 (1950).
  2. C. Pulfrich, Z. Instrumentenk. 28, 261 (1898).
  3. See, for example, S. Tolansky, Multiple-Beam Interferometry (Oxford University Press, London, 1948), Chapter II.
  4. H. Osterberg, J. Opt. Soc. Am. 22, 19 (1932).
  5. See also F. H. Branin, Jr., J. Opt. Soc. Am. 43, 839 (1953).
  6. R. Feldt, A. B. Du Mont Laboratories (private communication).
  7. G. R. Harrison and J. E. Archer, J. Opt. Soc. Am. 41, 495 (1951).

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