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We propose a sub-aperture stitching algorithm based on a frequency domain that can be denoted as a power spectral density(PSD). Our algorithm is verified by the experimental data obtained from measuring a Φ1.23 m mirror at the Changchun Institute of Optics, Fine Mechanics and Physics. Then, we apply it to the Great Steering Science Mirror(GSSM) of the Thirty Meter Telescope(TMT) with the simulated data before the preliminary design phase, and obtain a more objective result on the frequency domain aberrations. Therefore,the sub-aperture stitching-based PSD is expected to be useful for specifying a large aperture mirror surface for mirror vendors.
We propose a sub-aperture stitching algorithm based on a frequency domain that can be expressed as a power spectral density (PSD). Our algorithm is verified by the experimental data obtained from measuring a Φ1.23 m mirror at the Changchun Institute of Optics, Fine Mechanics and Physics. Then, we apply it to the Great Steering Science Mirror (GSSM) of the Thirty Meter Telescope (TMT) with the simulated data before the preliminary design phase, and obtain a more objective result on the frequency domain aberrations. , the sub-aperture stitching-based PSD is expected to be useful for specifying a large aperture mirror surface for mirror vendors.