5 research outputs found
The HYPSOS optomechanical bench design
In the last years, almost all the planetary missions have included a stereo camera and a spectrograph on-board. These two instruments respectively provide stereo images and spectral information, essential data to characterize a planet's surface. HYPSOS (HYPerspectral Stereo Observing System) is a novel instrument that will be able to merge the function of the two instruments. In fact, it will produce stereo hypercubes and represent 3D data with a fourth dimension: the spectral information.openEmbargo temporaneo per motivi di segretezza e/o di proprietà dei risultati e informazioni di enti esterni o aziende private che hanno partecipato alla realizzazione del lavoro di ricerca relativo alla tes
In-lab characterization of HYPSOS, a novel stereo hyperspectral observing system: first results
HYPSOS (HYPerspectral Stereo Observing System, patented) is a novel remote sensing instrument able to extract the spectral information from the two channels of a pushbroom stereo camera; thus it simultaneously provides 4D information, spatial and spectral, of the observed features. HYPSOS has been designed to be a compact instrument, compatible with small satellite applications, to be suitable both for planetary exploration as well for terrestrial environmental monitoring. An instrument with such global capabilities, both in terms of scientific return and needed resources, is optimal for fully characterizing the observed surface of investigation.
HYPSOS optical design couples a pair of folding mirrors to a modified three mirror anastigmat telescope for collecting the light beams from the optical paths of the two stereo channels; then, on the telescope focal plane, there is the entrance slit of an imaging spectrograph, which selects and disperses the light from the two stereo channels on a bidimensional detector. With this optical design, the two stereo channels share the large majority of the optical elements: this allowed to realize a very compact instrument, which needs much less resources than an equivalent system composed by a stereo camera and a spectrometer.
To check HYPSOS actual performance, we realized an instrument prototype to be operated in a laboratory environment. The laboratory setup is representative of a possible flight configuration: the light diffused by a surface target is collimated on the HYPSOS channel entrance apertures, and the target is moved with respect to the instrument to reproduce the in- flight pushbroom acquisition mode.
Here we describe HYPSOS and the ground support equipment used to characterize the instrument, and show the preliminary results of the instrument alignment activities
The HYPSOS optomechanical bench design
In the last years, almost all the planetary missions have included a stereo camera and a spectrograph on-board. These two instruments respectively provide stereo images and spectral information, essential data to characterize a planet's surface. HYPSOS (HYPerspectral Stereo Observing System) is a novel instrument that will be able to merge the function of the two instruments. In fact, it will produce stereo hypercubes and represent 3D data with a fourth dimension: the spectral information
Piezosurgery Versus Conventional Osteotomy in Orthognathic Surgery
The aim of the study was to compare in a randomized
controlled clinical trial the use of the piezoelectric osteotomy as an
alternative to the conventional approach in terms of surgery time,
intraoperative blood loss, cut quality, nerve injury, and costs.
One hundred ten patients who had orthognathic surgery procedures
with bimaxillary osteotomy were divided into 2 groups:
group A was treated with a piezosurgery device, and group B, with
a reciprocating saw and bur.
The piezosurgical bone osteotomy permitted individualized cut
designs. The surgical time in group A was reduced, with a mean for
the mandibular osteotomy (1 side) between 3 minutes 31 seconds and
5 minutes 2 seconds, whereas in group B, the surgical time was
between 7 minutes 23 seconds and 10 minutes 22 seconds. The
surgical time in group A for the Le Fort I osteotomy was between
5 minutes 17 seconds and 7 minutes 55 seconds in group A and
between 8 minutes 38 seconds and 15 minutes 11 seconds in group
B. All patients in group A had a low blood loss (G300 mL) versus
patients of group B who had a medium to high blood loss (medium
loss: 400 mL, high loss: 9500 mL). Inferior alveolar nerve sensation
was retained in 98.2% of group A versus 92.7% in group B at
6 months postoperative testing.
Piezoelectric osteotomy reduced surgical time, blood loss, and
inferior alveolar nerve injury in bimaxillary osteotomy. Absence of
macrovibrations makes the instrument more manageable and easy to
use and allows greater intraoperative control with higher safety in
cutting in difficult anatomical regions