Understanding mass transport in fuel cells using neutron imaging

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Presentation transcript:

Understanding mass transport in fuel cells using neutron imaging Dr. David L. Jacobson National Institute of Standards and Technology 100 Bureau Drive - Stop 8461 Bldg 235, Rm B185 Gaithersburg, MD 20899-8461 Phone: (301)975-6207 Fax: (301)926-1604 Email: david.jacobson@nist.gov

Overview Who are we and what is our mission Radiography Neutron Radiography NIST fuel cell role NIST Center for Neutron Research Fuel cell testing infrastructure Future goals and direction Access to the NIST facilities

Radiography Roentgen Hand (1898) formed using xrays

Radiography Contrast is due to attenuation of radiation Scattering density of material can be extracted N - density of sample atoms per cm3 I0 - incident neutrons per second per cm2  - neutron cross section in ~ 10-24 cm2 Sample t

Radiography Neutrons are the able to see hydrogen through heavy elements Comparison of the relative size of the x-ray and thermal neutron scattering cross section s for various elements. x-ray cross section H D C O Al Si Fe neutron cross section

Image Geometry Images are formed

What an image is CCD images each pixel is a count value proportional to the light from the scintillator. The transmission image below each pixel is a color or grayscaled value proportional to the fraction of neutrons that make it through the sample. i j

Neutron Camera CCD chip Lens Neutron beam Mirror Light tight box Pinhole collimator Fuel cell neutron to light converter Picture of the detector and sample holder assembly Computer

Neutron Imaging Facility

Neutron Image Quality Images are formed as shadows Edges will be blurred by various effects CCD camera and lens Neutron to