This work presents the conceptual design of a wavefront sensor utilizing the double-roof pyramid prism proposed for the On-Instrument Wavefront Sensor (OIWFS) within the Giant Magellan Telescope Multi-Object Astronomical and Cosmological Spectrograph (GMACS). It details the design process, presents simulation methods and results to verify the sensor’s performance, and investigates the sensor’s precision and limits by the telescope primary segments tilt to be estimated. The results of the simulations show that the pyramidal sensor has sufficient sensitivity to measure misalignment between the primary segments of up to 3μrad with an error of less than 5% and proved to be effective in estimating the wavefront slope for these limits. The optical model generated images of the exit pupil on the detector in compliance with the precautions demonstrated regarding field rotation, lateral color distortions, differential distortions, and pupil misalignments. The mechanical model resulted in an instrument that allows a complete scan over the external field intended for the search for a guide star and a detailed mechanical design for the manufacture of the pyramidal prisms. Opto-mechanical COTS elements were presented to exemplify the system. This contribution adds to the ongoing development of adaptive optics technology for GMACS on the Giant Magellan Telescope (GMT).
This work presents a performance study of the Double-Roof Pyramid wavefront sensor (DR-PWFS), consisting of two orthogonally positioned prisms, which offers some advantages over the Pyramid wavefront sensor (PWFS), one of the most significant being the reduced manufacturing cost. A study will be carried out in Zemax OpticStudio®, which performs simulations based on ray propagation, to verify the performance of the DR-PWFS sensor in comparison with the theoretical results obtained by Object-Oriented Matlab® Adaptive Optics (OOMAO) and to verifying the performance with the variation of some manufacturing parameters, such as “roof angle”, thickness, distance between prisms and alignment variations. It is expected to establish parameters of any errors or aberrations associated with the use of these sensors, in particular the Double-Roof Pyramid and thus create a theoretical and practical support to assist in the development of prototypes on optical benches using DR-PWFS.
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