Sparse aperture masking technique is based on principle of optical interference, it has high spatial resolution and is especially suitable for star diameter detection. It transforms telescope into a Fizeau interferometer by a simple action of placing an aperture mask over the pupil plane. In this paper, we explain its principle, simulate whole process on computer and develop our data processing method. Finally, we design a simple optical system in laboratory for experimental verification, in which stellar source is reproduced by a pinhole illuminated by a laser, choosing four sub-aperture mask on pupil plane, by measurement of interferogram visibility, we successfully acquire star diameter.
The non-redundant aperture masking techniques transforms telescope into a Fizeau interferometer by a simple action of placing an aperture mask over the pupil, the limited resolution set by atmospheric fluctuations can be overcome by closure phase techniques to obtain diffraction-limited images. For binary stars, the closure phases can not only eliminate the influence of atmospheric fluctuations on ground-based optical telescope, but also have a functional relationship with contrast and angular separation of binary stars. In this paper, basing on the mathematical model of non-redundant aperture masking detecting binary stars, we carry out the computer simulation and laboratory experiment by using the Golay-6 mask.
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