Portable Seeing Monitor

Portable Seeing Monitor

Portable Seeing Monitor 

The Seeing Monitor developed by AMOS is a telescope system which measures the image motion and scintillation on an existing observatory site or on a candidate site for a future observatory. Such an objective imposes constraints on the optical quality of the telescope, which has to be diffraction limited, and on the accuracy of the tracking which must be better than 0.1 arcsec. In spite of this constraint and in order to avoid the defects of the telescope tracking, two pupils are defined on the primary mirror. The information on the wave front is obtained by comparing at the Cassegrain focus the relative motions of images produced by the two distinct sub-apertures. The two images are separated by a prism and are detected by an intensified CCD camera. The telescope is a lightweight 350 mm clear aperture Cassegrain on an alt-alt mount. Two pupils of 150 mm diameter are defined on the primary mirror.

Technical data:

• Field of view : +/- 10 arcmin
• Stable focusing between : 0° and 30°C
• Lightweighted primary mirror : 350 mm useful diameter
• F ratio primary: 2
• Central hole : 55 mm
• Secondary mirror : 51 mm useful diameter
• Cassegrain : F ratio : 15
• Back focus : 100 mm
• Total mass : 35 kg

The mount is controlled by a lap computer which allows easy use of the telescope at any latitude. The seeing monitor is dismountable in parts lighter than 40 kg and able to resist transportation on rough roads.

CUSTOMER : ESO (European Southern Observatory)


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