Limited phase modulation and its effect on phase-only correlation

Robert W. Cohn; Joseph L. Horner

doi:10.1117/12.169417

1 March 1994 Limited phase modulation and its effect on phase-only correlation

Robert W. Cohn, Joseph L. Horner

Proceedings Volume 2237, Optical Pattern Recognition V; (1994) https://doi.org/10.1117/12.169417
Event: SPIE's International Symposium on Optical Engineering and Photonics in Aerospace Sensing, 1994, Orlando, FL, United States

Abstract

Phase-modulating devices, especially spatial light modulators, are often incapable of producing a full 360 degrees of phase modulation. Other limitations due to calibration errors, signal distortion, and quantization can cause the actual phase modulation to differ from the desired modulation. Such limitations on the filter plane modulator can reduce the performance of phase-only correlators. We quantify these performance losses for various phase limitations, both through simulation and through the development of an approximate model of performance. In one case we quantitatively compare the performance of phase-only filters that are optimized for limited-range phase modulation (as prescribed by Juday's `minimum Euclidean distance' principle) with the performance of nonoptimal filters. In another case we analyze the effect of not compensating a quadratic dependence of phase on signal voltage which is anticipated for some spatial modulators, e.g. deformable mirror devices.

Citation Download Citation

Robert W. Cohn and Joseph L. Horner "Limited phase modulation and its effect on phase-only correlation", Proc. SPIE 2237, Optical Pattern Recognition V, (1 March 1994); https://doi.org/10.1117/12.169417

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