Faint signal detection from two superposed signals in a rotationally shearing interferometer using a 4f optical processor

Manuel Montes-Flores; Guillermo Garcia-Torales; Marija Strojnik

doi:10.1117/12.2677919

20 October 2023 Faint signal detection from two superposed signals in a rotationally shearing interferometer using a 4f optical processor

Manuel Montes-Flores, Guillermo Garcia-Torales, Marija Strojnik

Author Affiliations +

Proceedings Volume 12686, Infrared Remote Sensing and Instrumentation XXXI; 126860M (2023) https://doi.org/10.1117/12.2677919
Event: SPIE Optical Engineering + Applications, 2023, San Diego, California, United States

Abstract

We propose a new derivation for two-plane wavefronts incident in a rotational shearing interferometer. We introduce a displacement in the optical path of the Rational Shearing Interferometer and therefore modify the spatial frequency. We obtain an approximate formulation for the total incidence for two independent signals. We use a 4f optical processor and interferometric cancellation to recover the weakest signal. We also use a cancellation signal’s advantage to improve the interest signal’s signal-to-noise ratio (SNR). The proposed method works efficiently for computer simulation, the next step uses the same procedure to eliminate frequencies for a laboratory interferogram. We simulate a Star-Planet system, and this process will help in exoplanet detection.

Citation Download Citation

Manuel Montes-Flores, Guillermo Garcia-Torales, and Marija Strojnik "Faint signal detection from two superposed signals in a rotationally shearing interferometer using a 4f optical processor", Proc. SPIE 12686, Infrared Remote Sensing and Instrumentation XXXI, 126860M (20 October 2023); https://doi.org/10.1117/12.2677919

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KEYWORDS

Prisms

Spatial frequencies

Signal processing

Interferograms

Shearing interferometers

Fourier transforms

Signal detection

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