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Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 67, Iss. 3 — Mar. 1, 1977
  • pp: 370–375

Least-square fitting a wave-front distortion estimate to an array of phase-difference measurements

David L. Fried  »View Author Affiliations


JOSA, Vol. 67, Issue 3, pp. 370-375 (1977)
http://dx.doi.org/10.1364/JOSA.67.000370


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Abstract

The problem of fitting a wave-front distortion estimate to a (single - instant) set of phase-difference measurements has been formulated as an unweighted least-square problem. The least-square equations have been developed as a set of simultaneous equations for a square array of phase-difference sensors, with phase estimates at the corner of each measurement element. (This corresponds to the standard Hartmann configuration and to one version of a shearing interferometer of a predetection compensation wave-front sensor.) The noise dependence in the solution of the simultaneous equations is found to be expressible in terms of the solution to a particular version of the measurement inputs to the simultaneous equation, a sort of "Green’s-function" solution. The noise version of the simultaneous equations is solved using relaxation techniques for array sizes from 4 × 4 to 40 × 40 phase estimation points, and the mean-square wave-front error calculated as a function of the mean-square phase-difference measurement error. It is found that the results can be approximated within a fraction of a percent accuracy by 〈(δΦ)2〉 = 0.6558[1 + 0.24441n(N22pd, where 〈(δΦ)2〉 is the mean-square error (rad2) in the estimation of the wave-front distortion, for a square array consisting of N2 square subaperture elements over which two phase-difference measurements are made—one phase difference across the x dimension and the other difference across the y dimension. Here σ2pd is the mean-square error (rad2) in each phase-difference measurement.

© 1977 the Optical Society of America

Citation
David L. Fried , "Least-square fitting a wave-front distortion estimate to an array of phase-difference measurements," J. Opt. Soc. Am. 67, 370-375 (1977)
http://www.opticsinfobase.org/josa/abstract.cfm?URI=josa-67-3-370

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