The Multiconjugate Adaptive optics Demonstrator (MAD) for ESO-Very LargeTelescopes (VLT) will demonstrate on sky the MultiConjugate Adaptive Optics(MCAO) technique. In this paper the laboratory tests relative to the firstpreliminary acceptance in Europe of the Layer Oriented (LO) Wavefront Sensor(WFS) for MAD will be described: the capabilities of the LO approach have beenchecked and the ability of the WFS to measure phase screens positioned atdifferent altitudes has been experimented. The LO WFS was opto-mechanicallyintegrated and aligned in INAF - Astrophysical Observatory of Arcetri beforethe delivering to ESO (Garching) to be installed on the final optical bench.The LO WFS looks for up to 8 reference stars on a 2arcmin Field of View and upto 8 pyramids can be positioned where the focal spot images of the referencestars form, splitting the light in four beams. Then two objectives conjugatedat different altitudes simultaneously produce a quadruple pupil image of eachreference star.
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机译：适用于ESO大型望远镜（VLT）的多共轭自适应光学演示器（MAD）将在空中演示多共轭自适应光学（MCAO）技术。在本文中，将描述相对于MAD的层定向（LO）波前传感器（WFS）在欧洲的第一个初步验收的实验室测试：已经检查了LO方法的能力，并且WFS测量了相位屏的能力在不同的高度进行了实验。 LO WFS被光机械集成并对准了Arcetri的天体物理天文台（INAF-天体物理天文台），然后交付给安装在最终光学平台上的ESO（Garching）。LOWFS在2arcmin视场上寻找多达8颗参考星，直至可以将8个金字塔放置在参考星的焦点图像形成的位置，将光分成四束。然后，在不同高度共轭的两个物镜同时产生每个参考恒星的四倍瞳孔图像。
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