WebOct 14, 2024 · Ion Beam Figuring (IBF), as a highly deterministic surfacing technique, has been used for ultra-precision finishing of mirrors. One crucial step that guides the IBF process is dwell time calculation. A valid dwell time solution should be non-negative and duplicate the shape of the desired removal map. WebThe Technology of Ion Beam Figuring. Ion beam figuring (IBF) is an etching process under high vacuum conditions especially for optical substrates, like telescope mirrors. A small beam of positive charged ions is used to physically etch material from a substrate. It is also often referred to as ion beam polishing or ion beam finishing, as it is ...
Study on the performances of dwell time algorithms …
WebMay 18, 2024 · Ion Beam Figuring (IBF), as a highly deterministic surfacing technique, has been used for ultra-precision finishing of mirrors. One crucial step that guides the IBF process is dwell time calculation. A valid dwell time solution should be non-negative and duplicate the shape of the desired removal map. WebBased on the Bayesian principle, an iterative dwell time algorithm for planar mirrors is deduced from the computer-controlled optical surfacing (CCOS) principle. With the properties of the removal function, the shaping process of low-gradient mirrors can be approximated by the linear model for planar mirrors. imperfection essay
Algorithm for ion beam figuring of low-gradient mirrors - Optica
WebOct 21, 2008 · Dwell time algorithm in ion beam figuring. J. Wu, Z. Lu, Hong Zhang, T. Wang Materials Science Applied optics 2009 TLDR The simulations show that a perfect dwell time solution could be obtained by the revised matrix equation and initial surface error map extension with the help of the least squares QR (LSQR) algorithm. 46 PDF WebJun 1, 2007 · To determine the dwell time is an important problem in ion beam figuring. Usually, the ion beam figuring process can be described by a two-dimensional … WebMay 14, 2015 · An optimized dwell time algorithm for magnetorheological finishing (MRF) is discussed. Based on the D-shape of the removal function of MRF, an optimized non-negative least-squares method is introduced to get dwell time from a linear matrix equation transferred from the de-convolution operation. litany of all saints pdf