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Neutron Imaging: A Non-Destructive Testing Method to Investigate Canned Exhaust After-Treatment System Components for the Three Dimensional Soot, Ash, Urea and Coating Distributions
Technical Paper
2016-01-0985
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Neutron imaging (NI) is an alternative non-destructive inspection technique compared to the well-known X-ray method. Although neutron imaging data look at a first glance similar to X-ray images it must be underlined that the interaction mechanism of the sample material with neutrons differs fundamentally. X-ray interaction with matter occurs with the electrons in the atomic shells whereas neutrons interact only with the atomic nuclei. Hence, both methods have a different and to great extent complementary contrast origin. Neutron imaging allows for a higher penetration through heavier elements (e.g. metals) whereas a high contrast is given for light elements (e.g. hydrogen).
By the use of neutrons instead of X-rays exhaust after-treatment systems can be successfully examined non-destructively for their soot, ash, urea and coating distributions. The big advantage of neutron imaging is that detailed, high-contrast images can be obtained even in canned substrates (silicon carbide or cordierite). Neutron imaging can be applied to substrates of passenger cars, trucks and even heavy duty vehicles. We can offer a maximum field of view up to 400mm × 400mm and a spatial resolution down to 13,5 μm/pixel.
The paper briefly outlines the method of neutron imaging and its advantage and complementary character compared to the conventional X-ray method. We present neutron tomography results of diesel particulate filter (DPF) and gasoline particulate filters (GPF) concerning: (i) Soot, ash, metallic particle and coating distributions in a canned passenger car DPF. (ii) Urea distributions in passenger car DPF. (iii) Ash distribution in a canned passenger car GPF. (iv) Ash residuals of a truck DPF after cleaning with different techniques.
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Authors
Citation
Gruenzweig, C., Mannes, D., Schmid, F., and Rule, R., "Neutron Imaging: A Non-Destructive Testing Method to Investigate Canned Exhaust After-Treatment System Components for the Three Dimensional Soot, Ash, Urea and Coating Distributions," SAE Technical Paper 2016-01-0985, 2016, https://doi.org/10.4271/2016-01-0985.Also In
References
- Zandhuis , J. A. et al. SAE Nondestructive X-ray Inspection of Thermal Damage, Soot and Ash Distributions in Diesel Particulate Filters 10.4271/2009-01-0289 2009
- Grünzweig , C. e. al. Progress in industrial applications using modern neutron imaging techniques Physics Proceedings 43 231 242 2012
- Grünzweig , C. , Mannes , D. , Kaestner , A. , Vogt , M. Visualizing the soot- and ash distribution in diesel particulate filters using neutron imaging MTZ 73 4 326 2012
- https://www.youtube.com/watch?v=A4kWCP39t6U&feature=player_embedded
- http://www.ceramex.com/xpurge-dpf-cleaning/