NEXIS™ (N-Energy X-ray Image Scanning) is a modular detector
sytem designed for high-flux, multiple-energy x-ray imaging. It
consists essentially of detector boards equipped with linear (CdZnTe)
detector arrays read out by XENA™ signal processor chips.
XENA™ Detector Readout Chip
- Multichannel monolithic construction
- Simultaneous multiple energy band output per channel (up to five bands)
- Good energy resolution
- Charge sensitive amplifiers with fast pulse shaping
- High count rate (up to 2 Mcounts/sec per channel)
- Submicron process fabrication
CZT Linear Detector Array
- (2 x 16) 1mm or (1 x 32) 0.5mm pixel pitch
- Uniform pixel-to-pixel x-ray response
- Wide x-ray energy range (10 keV to 300 keV)
- High energy resolution (1⁄4 3.5 keV @ 60 keV and 1⁄4 8
keV @ 122 keV)
- Multispectral imaging capability for scanner applications
- Short electron collection times (1⁄4 100 ns @ 400 V bias for
2 mm thickness)
- High-flux operation (up to 2 Mcounts/sec per channel)
- Low dark (leakage) current per pixel
- Room temperature operation
Availability
The standard NEXIS™ system consists of: one detector board with
eight socket strips for connecting eight CZT pixel arrays read out by
eight XENA™ ICs; one control board; one custom PCI I/O which goes
into a Windows platform PC; a metal enclosure in which the detector boards
and control board are mounted; control and data acquisition firmware and
software; and cables for the system. The CZT detectors come in the form
of (2x16) 1mm or (1 x 32) 0.5mm pixel pitch arrays with 1.75mm or 3 mm
thickness. Up to eight detector boards have been operationally tiled together
to form a detector length of about one meter; a maximum of sixteen detector
boards can be accommodated.
*NEXIS™ was developed with support in part from CALTIP,
CCAT and OTTC-CCAT commercialization grants. It supersedes NOVA's earlier
ABIS (Automated Baggage Inspection System) detector technology developed
under sponsorship of the Army/ARDEC and the USDA/APHIS.
Images
 NEXIS™
CB Board
NEXIS™ PCI Board
NEXIS™ X-ray Images
 NEXIS™
Box
Documents
- IEEE paper: “Multi-Energy
X-ray Imaging with Linear CZT Pixel Arrays and Integrated Electronics.”
- NEXIS™ Brochure with Specifications
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