The iQuad wavefront sensor's linear operator is shown to be self-adjoint with a connection to the 2D finite Hilbert transform; a double iQuad design is introduced to address phase detection limits.
Calibration of quasi-static aberrations in exoplanet direct-imaging instruments with a Zernike phase-mask sensor.A&A, 555:A94
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A self-adjoint Fourier-type model for the iQuad wavefront sensor
The iQuad wavefront sensor's linear operator is shown to be self-adjoint with a connection to the 2D finite Hilbert transform; a double iQuad design is introduced to address phase detection limits.