A coded-aperture technique allowing x-ray phase contrast imaging with conventional sources
Phase contrast imaging (PCI) solves the basic limitation of x-ray imaging, i.e., poor image contrast resulting from small absorption differences. Up to now, it has been mostly limited to synchrotron r...
Phase contrast imaging (PCI) solves the basic limitation of x-ray imaging, i.e., poor image contrast resulting from small absorption differences. Up to now, it has been mostly limited to synchrotron r...
Publisher's Note: “Phonon assisted thermophoretic motion of gold nanoparticles inside carbon nanotubes” [Appl. Phys. Lett. 90, 253116 (2007)]
Flux locking a superfluid interferometer
Appl. Phys. Lett. 91, 074107 (2007); doi:10.1063/1.2772659
Published 16 August 2007
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The authors demonstrate a flux locking technique using injected heat current to linearize the output of a superfluid helium-4 interferometer. A rotation flux through the interferometer loop produces a shift in the phase of the superfluid order parameter. This shift is nullified via negative feedback by a phase shift caused by the injected heat current. The feedback signal is then a linear function of rotation flux.
©2007 American Institute of Physics
| History: | Received 11 May 2007; accepted 21 July 2007; published 16 August 2007 |
| Permalink: |
http://link.aip.org/link/?APPLAB/91/074107/1 |
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