Quantification of Sub-Pixel Dynamics in High-Speed Neutron Imaging

Area of Science:

• Materials Science and Engineering
• Non-Destructive Testing and Evaluation
• Nuclear Instrumentation and Methods

Background:

• Neutron imaging offers superior penetration depth for non-destructive analysis of dense materials, surpassing X-ray and optical methods.
• Previous limitations in neutron source flux and detector sensitivity hindered simultaneous achievement of high spatial (<10 μm) and temporal (<10 μs) resolution.
• These limitations restricted the application of neutron imaging in fields requiring simultaneous high-resolution imaging of dynamic processes.

Purpose of the Study:

• To present a novel attenuation modeling approach for quantifying sub-pixel dynamics using neutron imaging.
• To demonstrate the simultaneous achievement of high spatial and temporal resolution in neutron imaging.
• To overcome previous technological barriers in neutron imaging for dynamic process analysis.

Main Methods:

• Development and application of an attenuation modeling technique.
• Acquisition of cyclic ensemble neutron image sequences.
• Analysis of an automotive gasoline direct injector under operational conditions.

Main Results:

• Quantification of sub-pixel dynamics achieved at a 5 μs time scale.
• Demonstration of a spatial noise floor in the order of 5 μm.
• Successful application to a complex dynamic system (automotive gasoline direct injector).

Conclusions:

• The developed attenuation modeling approach enables high-resolution, time-resolved analysis of dynamic processes previously inaccessible to neutron imaging.
• This advancement significantly expands the applicability of neutron imaging across various scientific and industrial research fields.
• The study overcomes critical limitations in neutron imaging, paving the way for new discoveries in materials and dynamic systems.