8 research outputs found
Precision measurements of Linear Scattering Density using Muon Tomography
We demonstrate that muon tomography can be used to precisely measure the
properties of various materials. The materials which have been considered have
been extracted from an experimental blast furnace, including carbon (coke) and
iron oxides, for which measurements of the linear scattering density relative
to the mass density have been performed with an absolute precision of 10%. We
report the procedures that are used in order to obtain such precision, and a
discussion is presented to address the expected performance of the technique
when applied to heavier materials. The results we obtain do not depend on the
specific type of material considered and therefore they can be extended to any
application.Comment: 16 pages, 4 figure
Preliminary calibration results of the wide angle camera of the imaging instrument Osiris for the Rosetta mission
Rosetta is one of the cornerstone missions of the
European Space Agency for having a rendezvous with
the comet 67P/Churyumov-Gerasimenko in 2014. The
imaging instrument on board the satellite is OSIRIS
(Optical, Spectroscopic and Infrared Remote Imaging
System), a cooperation among several European
institutes, which consists of two cameras: a Narrow
(NAC) and a Wide Angle Camera (WAC).
The WAC optical design is an innovative one: it adopts
an all reflecting, unvignetted and unobstructed two
mirror configuration which allows to cover a 12\ub0
7 12\ub0
field of view with an F/5.6 aperture and gives a
nominal contrast ratio of about 10\u20134.
The flight model of this camera has been successfully
integrated and tested in our laboratories, and finally has
been integrated on the satellite which is now waiting to
be launched in February 2004.
In this paper we are going to describe the optical
characteristics of the camera, and to summarize the
results so far obtained with the preliminary calibration
data. The analysis of the optical performance of this
model shows a good agreement between theoretical
performance and experimental results