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Instrument
Theory: Monochromatic wavelength dispersive X-ray fluorescence spectroscopy (WDXRF)
Application: Analyzing sulfur content in fuel down to 0.2 ppm LOD, compliant with ASTM D7039, ASTM D2622, ISO 20884, SH/T 0842
X-ray Source
Micro-focus X-ray tube (focus spot 175 µm, target Cr, Be window 100 µm)
Optics
Johansson-type DCC for monochromatic excitation and characteristic X-ray detection
Vacuum chamber XFS (X-ray Fixed System)
Detection
Sealed proportional counter (25.4 µm Be window)
Digital shaping, high-speed multi-channel pulse height analyzer
Software
High-speed processor or embedded system platform
Touch-pad with graphical user interface
Functions include calibration, drift correction, routine testing, data browsing, data printing, statistical analysis and data transfer
Environmental Requirement
Room temperature: 15–30°C
Relative humidity <80%
Parameters
LOD: 0.2 ppm at 300 s
Range: 0.2 ppm–10%
Measuring time: 30–300 s
Standard error: Sn-1 <0.2 ppm (2 ppm), 0.4 ppm (10 ppm), 2.5 ppm (50 ppm)
Power Requirement
AC 220–240 V, 5A
Rated power: 500 W
Johansson-Type DCC
Monochromatic WDXRF using double curved crystal optics has the advantage of very high sensitivity for a specific sample element of interest.
The primary Johannson-Type DCC focusing optic captures a narrow bandwidth of X rays from the source and focuses this intense monochromatic beam to a small spot on the sample. The monochromatic primary beam excites the sample and secondary characteristic fluorescence X-rays are emitted.
The second Johannson-Type DCC collects only select characteristic X-ray wavelengths of interest within a narrow bandwidth
XFS (X-Ray Fixed System)
The optics system is carefully adjusted in the factory with special facilities and locked tightly on its proper position.
High precision optics
All core optic units were manufactured with CMC facilities. No moving parts and no slit switching optics in the whole instrument, to ensure the long term reliability.
High Integration
Digital Multi-Channel Analyzer
High precision digital pulse shaping and digital pulse height analyzer based on FPGA; implement fast baseline restoration and best peak detection function
