{"id":801,"date":"2021-03-18T16:39:54","date_gmt":"2021-03-18T15:39:54","guid":{"rendered":"http:\/\/wwwmaory.oabo.inaf.it\/?page_id=801"},"modified":"2022-09-09T13:24:19","modified_gmt":"2022-09-09T11:24:19","slug":"the-instrument","status":"publish","type":"page","link":"http:\/\/wwwmorfeo.oabo.inaf.it\/index.php\/the-instrument\/","title":{"rendered":"THE INSTRUMENT"},"content":{"rendered":"

The MORFEO\u00a0 main structure is\u00a0 \u00a0based on a latticework tower made of standard structural steel truss-beam shaped pipes, welded\/bolted with different section properties.\u00a0 The truss is connected to the Nasmyth platform through 10 legs that merge into 3 points. The overall design has been constrained to be able to fit with the three legs concept, in order to null the distortion induced by the Nasmyth displacements out of a rigid body motion.<\/p>\n

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\"\"<\/a>
General overview of the MORFEO instrument (thermal cover in transparency) installed on the Nasmyth platform with MICADO<\/figcaption><\/figure>\n

A<\/span> general overview of the MORFEO global architecture is illustrated in Figure 3.\u00a0 \u00a0The main hardware subsystems indicated in the figure are complemented by the electronics at system and sub-systems level, instrument control software and real time computer.<\/p>\n

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WAVEFRONT SENSOR MODULES<\/strong><\/h2>\n

The MCAO mode in MORFEO is based on the use of two wave-front sensor (WFS) modules:\u00a0 an LGS WFS module with 6 beacons (upgradable for 8) arranged in a 45\u201d asterism,\u00a0 an NGS WFS module with 3 low order sensors and 3 reference sensors patrolling a technical field of 160 arcses.<\/p>\n

The LGS WFS module is a device dedicated to measurement of the wavefront aberrations due to atmospheric turbulence and other effects.\u00a0 In the following figure\u00a0 we show an overall view of the full LGS WFS assembly.<\/p>\n

\"\"<\/a>
Overview of the LGS WFS module<\/figcaption><\/figure>\n

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The LGS WFS module contains 6 wavefront sensor units to measure wavefront distortion on the laser guide stars. It is attached below the MORFEO main structure\u00a0 in a gravity invariant configuration.\u00a0 The light of wavelength shorter than about 600 nm is propagated from the Dichroic beam-splitter through the LGS Path Optics and then to the LGS Wavefront Sensor module. The light enters each probe, where it is collected by a WFS camera<\/p>\n

The Low Order and Reference (LOR) Module implements the Natural Guide Star wavefront sensing functionalities needed by MORFEO in the MCAO mode.<\/p>\n

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\"\"<\/a>
Detail of the hardware implemented within the LOR WFS module.<\/figcaption><\/figure>\n

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The LOR WFS Module is downstream of the Post Focal Relay Optics (PFRO), and the LOR WFS benefits from the MCAO correction, of course in a way that depends on the off-axis distance of the NGS. It consists of 3 identical LOR WFS units to sense the aberrations in the direction of 3 NGSs chosen in a technical field having an outer radius of 80 arcsec. \u00a0Each LOR WFS Unit is equipped with a Low-Order WFS and a Reference WFS sharing the light from the same NGS. The Low-Order (LO) WFS configuration is a Shack-Hartmann sensor with 2×2 sub-apertures operating in the H band. The Reference WFS act as \u201ctruth\u201d sensor to de-trend LGS wavefront estimates and measure pseudo-static aberrations of the telescope and of the post focal relay optics.<\/p>\n","protected":false},"excerpt":{"rendered":"

The MORFEO\u00a0 main structure is\u00a0 \u00a0based on a latticework tower made of standard structural steel truss-beam shaped pipes, welded\/bolted with different section properties.\u00a0 The truss is connected to the Nasmyth platform through 10 legs that merge into 3 points. The overall design has been constrained to be able to fit with the three legs concept, … <\/p>\n

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