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The continuous environmental radiation monitoring is very important after Fukushima accident especially for the evaluation of the decontamination. A portable gamma camera system is designed and fabricated with a compact digital front-end detector. A front-end detector consists of an 12 × 12 GAGG-APD (pixel size = 2 × 2 × 5 mm3) array combined with 144 channel Time over Threshold based ASIC. All the...
77 GHz millimeter wave passive imaging camera for the purpose of security is developed. In order to detect concealed objects in clothes without hindrance to flow of people at airport security checks, video rate imaging is realized using one-dimensional imaging sensor array of 25 elements and a flapping reflector. As receiving antennas, novel antipodal Fermi antenna (APFA) having required characteristics...
We demonstrated terahertz imaging using a two-dimensional array detector with 5times5 elements based on superconducting tunnel junctions. Real-time 25-pixel imaging at 0.65 THz was successfully performed. The array detector also allowed the shortening of the total acquisition time for larger images, made up of pixel blocks.
FDTD analysis of APFA array as a receiving elements for real time PMMW imaging has been presented. It has been demonstrated that the mutual coupling among APFA elements significantly decreases by the presence of corrugation. Furthermore, an axially symmetric array element pattern having a beam width of about 60deg is obtained for the 9 times 9 element APFA array, which is suitable for f/D=1 optics...
This paper presents an HDTV video decoder core that is is able to decode MPEG-2, MPEG-4 AVC and VC-1 formats and is fully compatible with the Blu-ray Disc standard. A novel re-configurable architecture is adopted to achieve reduced hardware, and a data compression method suitable for all video decoding standards is applied to reduce memory data usage and access bandwidth. The circuit volume of the...
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