We have applied the bispectrum algorithm to one-dimensional infrared speckle data for retrieval of diffraction limited phases. We use a standard weighting averaging technique to combine the multiple phase estimates contained in the bispectrum. We have also used the bispectrum modulus to obtain visibility amplitudes. Results, including images, are presented for three different binary stars. Simulated data has also been used to study the behaviour of the algorithm under different signal-to-noise conditions as well as a study of phase recovery for different defocus conditions. We find that the algorithm is sensitive, at a low level, to focus changes especially for noisy data. Comparison of the bispectrum phases is made with those obtained from Knox-Thompson cross-spectra for all cases.

Date Published: 29 January 1988
PDF: 8 pages
Proc. SPIE 0828, Digital Image Recovery and Synthesis, (29 January 1988); doi: 10.1117/12.942076

Published in SPIE Proceedings Vol. 0828:
Digital Image Recovery and Synthesis
Paul S. Idell, Editor(s)