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15 July 2008 Wavefront and distance measurement using the CAFADIS camera
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Abstract
The CAFADIS camera is a new sensor patented by Universidad de La Laguna (Canary Islands, Spain): international patent PCT/ES2007/000046 (WIPO publication number WO/2007/082975). It can measure the wavefront phase and the distance to the light source at the same time in a real time process. This could be really useful when using Adaptive Optics with Laser Guide Stars, in order to know the LGS height variations during the observation, or even the 3D LGS profile at Na layer. The CAFADIS camera has been designed using specialized hardware: Graphical Processing Units (GPUs) and Field Programmable Gates Arrays (FPGAs). These two kinds of electronic hardware present an architecture capable of handling the sensor output stream in a massively parallel approach. Previous papers have shown their ability for AO in ELTs. CAFADIS is composed, essentially, by a microlenses array at the telescope image space, sampling the image instead of the telescope pupil. Conceptually, when only 2x2 microlenses are presented it is very similar to the pyramid sensor. But in fact, this optical design can be used to measure distances in the object space using a variety of techniques. Our paper shows a simulation of an observation using Na-LGS and Raylegh-LGS at the same time, where both of the LGS heights are accurately measured. The employed techniques are presented and future applications are introduced.
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J. M. Rodríguez-Ramos, B. Femenía Castellá, F. Pérez Nava, and S. Fumero "Wavefront and distance measurement using the CAFADIS camera", Proc. SPIE 7015, Adaptive Optics Systems, 70155Q (15 July 2008); https://doi.org/10.1117/12.789380
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