KEYWORDS: Sun, Sensors, Solar radiation, Optical filters, Infrared radiation, Satellites, Solar energy, Space operations, Staring arrays, Signal to noise ratio
In normal operation mode, RSI is not exposed to direct Sun irradiation, as long on-ground
nominal procedure for Mission Programming is respected. The Spacecraft contingency mode is the
so-called Safe Mode, in Safe mode, RSI can be exposed for a short time to direct Sun irradiation, as
shown by AOCS detailed simulations. This may happen only during the initial transient phase of ASH
mode, when attitude has not yet fully converged. The aim of this paper is to discuss that if Sun
exposure periods are compatible with RSI constraints. There are two factors to be taken into
consideration; one is the Sun exposure period (duration), the other is the Sun direct illumination in
sensor and filter.
A CMOS image sensor chip with the ceramic package technique for remote sensing application is presented in this
paper. The chip is fabricated using the United Microelectronics Corporation (UMC) 0.18 um CMOS technology and
occupies 25 mm x 120 mm of chip area, which is much larger than the conventional ones. Furthermore, a trade-off in
sealing of the cover glass faces the gas leak and moisture sorption. The package of the CMOS image sensor chip in space
may cause crack, leakage, and deformation. Consequently, a large-scale and specific package is required to meet remote
sensing application. The proposed ceramic package comprises a ceramic substrate, a cover glass, a chip seal, a glass seal,
and golden lines. The dimension with lead is approximately 155 mm x 60 mm x 7.87 mm, including 76 Pin Grid Array
(PGA) at each side. To demonstrate the reliabilities, the sensor with large-scale ceramic package is also analyzed,
manufactured, and tested by the thermal shock, vibration, and vacuum tests. Moreover, the Coordinate Measuring
Machine (CMM) is employed to measure the common plane of the package. By testing 12 points on the top plane of the
package, the measured relatively peak-to-peak variation can be lower than 10 um. A large-scale ceramic package of the
CMOS image sensor chip is implemented in this work to achieve the specifications of the remote sensing application in
space.
KEYWORDS: Tablets, Picture Archiving and Communication System, Databases, Local area networks, Personal digital assistants, Image resolution, Operating systems, Image retrieval, Telecommunications, Zoom lenses
A PACS mobile terminal has applications in ward round, emergency room and remote teleradiology consultation. Personal Digital Assistants (PDAs) have the highest mobility and are used for many medical applications. However, their roles are limited in the field of radiology due to small screen size. In this study, we built a wireless PACS terminal using a hand-held tablet-PC. A tablet PC (X-pilot, LEO systems, Taiwan) running the WinCE operating systems was used as our mobile PACS terminal. This device is equipped with 800×600 resolution 10.4 inch TFT monitor. The network connection between the tablet PC and the server was linked via wireless LAN (IEEE 802.11b).
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