XDAS detector boards

The XDAS system provides a highly flexible means of creating an array of linear X-ray sensors.

XDAS V2 boards enable users to build their own linear X-ray detectors with boards arranged as required. They are suitable for use in Linescan and CT applications. The system is modular and consists of a set of detector head boards (XDAS-DH2-xx) and signal processing boards (XDAS-SP2-xx).

Each detector head board has 128 channels. 7 signal processing boards can be connected in series with up to 24 detector head boards connected to each signal processing board, giving a maximum system size of 168 detector head boards or 21504 channels. Detector boards can be butted end-to-end to form a continuous array. Interconnection is via a 50-way ribbon cable, carrying data and power.

Dual and Single Energy XDAS Boards

A standard XDAS detector head board is supplied in 2 basic formats, depending on whether a dual energy version, for material discrimination, or a single energy version is required.

The dual energy version has 64 detector channels on each side of the board for detection of low and high energy X-rays. The detector pitch is 1.6mm or 2.5mm.

The single energy version has 64 or 128 detector channels on one side of the board only. The detector pitch is 0.4mm, 0.8mm or 1.6mm.

Multiview System

The XDAS Multiview system has 5 inputs, one for each view. Each view can have up to 12 detector boards. This enables up to 60 boards to be run from a single signal processing board.

Connection to processor

The unit can be interfaced to a processor via a:

• USB2 cable directly to the processor. In this case the maximum cable length is 5m.
• USB2 remote - requires a converter box XDAS-USB2 with a SCSI cable length up to 100M
• PCI7300A card - requires an XDAS-485A-TTL adaptor with a SCSI cable length up to 100M
• Frame Grabber card - requires an XDAS-485A-DFG adaptor with a SCSI cable length up to 100M

Control signals are transmitted to the unit via the USB2 connection or the RS232 serial port.

Control signals

Scan time and number of sub-samples are controlled from the processor.
An external trigger input (nScan) is available if required.

Features

• Single and dual energy versions
• 20keV to 300keV
• 0.4mm, 0.8mm, 1.6mm, 2.5mm detector pitch
• Gadox, CsI, CdWO4 scintillator
• Minimum 100µs signal integration time
• Facility for 1, 2, or 4 sub-samples
• 3pC to 60pC dynamic range
• 16 bit output
• Up to 38000:1 signal-to-noise

Software

Users will be required to use their independent software applications to provide system control, data acquisition and image processing. To assist this task a software development kit (SDK) is available for the development of user applications. Standard software is supplied to permit basic operation and evaluation of the system. The software enables single lines of data to be acquired and stored, data acquisition time to be set and offset and gain correction to be applied.
Power supply requirements
6V to 9V, current depends on number of boards

Environmental specification
temperature (operating) +5 to +35 °C
humidity (non-condensing) 93 % at 30 ºC
pressure for transportation can
withstand pressure reductions from 100kPa (1 bar) to 68kPA (0.68 bar)

XDAS-V2 0.4mm pitch single energy
XDAS-V2-31 multiview system
XDAS-HE
XDAS-V2 user manual
XDAS Accessories (coming soon)