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The microDXP miniaturized circuit-board can easily be incorporated into a variety of benchtop, portable, networked and embedded x-ray and gamma-ray spectroscopy data acquisition systems. In the first example the microDXP runs either on the laboratory benchtop as a peripheral device under the control of an x86 Personal Computer, or similarly in portable systems under the control of a PDA. No hardware or firmware modifications are required.
In the second example a more complex dedicated system is considered. The I2C serial bus is used to control a ‘smart’ x-ray tube and detector HV bias supply, and the auxiliary digital I/O drives electromechanical or pneumatic components in real time based upon user defined metrics of acquired data.
Example 1. General-Purpose Spectrometer
In this example the microDXP and hardware included in the Development Kit act as a general-purpose spectrometer, connected as a peripheral device under the control of a host computer or PDA. No specialized data acquisition modes are required, thus no firmware development is necessary.
XIA non-recurring engineering (NRE) required: None
User development required: Enclosure design
The microDXP, power supplies and microComU
together constitute a spectrometer that can be connected to virtually
any controller with USB or RS-232 communications. Note: The microComU
interface board included with the development
kit falls into this category.
Fig. 1: A general-purpose spectrometer incorporating the microDXP. The microComU interface connects the microDXP to the host computer/PDA and power supplies.
Example 2. Dedicated Embedded Spectrometer
This example considers a materials sorting application
where objects with certain pre-defined alloy ratios X, Y and Z are to
be separated from others. An x-ray source irradiates incoming samples,
and incident x-rays are collected by a solid-state detector connected
to the microDXP. The microDXP is configured to assert a combination
of its auxiliary digital I/O lines whenever the peak ratio X,Y, or Z
is detected. The digital I/O lines drive electromechanical or pneumatic
components in real-time to execute the appropriate mechanical operation,
e.g. put the recognized object in the desired bin. User controls are
limited to starting and stopping the system, and selecting one out of
a small number of operating modes. Power supplies for the microDXP are
also included. Finally, an external data port (e.g. RS-232) is also
included so that ratios corresponding to new alloys can be defined,
and new firmware uploaded without dismantling the hardware; or, alternatively,
the microDXP could periodically be run in full MCA mode under computer
control for diagnostic purposes.
XIA non-recurring engineering (NRE) required:
User development required:
Fig. 2: A system with a fully embedded host and user interface, with real time controls via the Auxiliary digital I/O.
Designing the system described above using conventional spectroscopy components would be a much more complex (and considerably more expensive) task, when compared with the solutions proposed here. Please contact the microDXP team at to discuss your application today!
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http://www.xia.com/microDXP.html, last updated
August 9, 2012