We demonstrate a photonic sensor of the magnetic field and its gradients with remote readout. The is based on optically detected resonance (ODMR) in nanodiamonds nitrogen-vacancy color centers that are covalently attached as thin film one facet an optical fiber bundle. By measuring ODMR signals from group individual fibers ∼0.5-mm-wide imaging bundle, differences local strengths determined acro...

Due to the low x-ray photon utilization efficiency and low measurement sensitivity of the electron multiplying charge coupled device camera setup, the collimator-based narrow beam x-ray luminescence computed tomography (XLCT) usually requires a long measurement time. We, for the first time, report a focused x-ray beam-based XLCT imaging system with measurements by a single optical fiber bundle ...

The intracellular and interstitial potentials associated with each cell or fiber in multicellular preparations carrying a uniformly propagating wave are important for characterizing the electrophysiological behavior of the preparation and in particular, for evaluating the source contributed by each fiber. The aforementioned potentials depend on a number of factors including the conductivities c...

A method of eliminating pixelization effect from en face optical coherence tomography (OCT) image when a fiber bundle is used as an OCT imaging probe is presented. We have demonstrated that applying a histogram equalization process before performing a weighted-averaged Gaussian smoothing filter to the original lower gray level intensity based image not only removes the structural artifact of th...

Some high-performance imaging systems generate a curved focal surface and so are incompatible with focal plane arrays fabricated by conventional silicon processing. One example is a monocentric lens, which forms a wide field-of-view high-resolution spherical image with a radius equal to the focal length. Optical fiber bundles have been used to couple between this focal surface and planar image ...

A Q-manifold is a graded manifold endowed with a vector field of degree one squaring to zero. We consider the notion of a Q-bundle, that is, a fiber bundle in the category of Q-manifolds. To each homotopy class of “gauge fields” (sections in the category of graded manifolds) and each cohomology class of a certain subcomplex of forms on the fiber we associate a cohomology class on the base. Any ...

Let M be a closed smooth manifold. We will denote the group of all selfdiffeomorphisms of M , with the smooth topology, by DIFF (M). By a smooth bundle over X, with fiber M , we mean a locally trivial bundle for which the change of coordinates between two local sections over, say, Uα, Uβ ⊂ X is given by a continuous map Uα ∩ Uβ → DIFF (M). A smooth bundle map between two such bundles over X is ...

On a fiber bundle without structure group the action of the gauge group (the group of all fiber respecting diffeomorphisms) on the space of (generalized) connections is shown to admit no slices.

Let M be a closed oriented manifold, and let Sg denote the closed surface of genus g; unless otherwise specified, assume g ≥ 2. A surface bundle over M is a fiber bundle with base space M and fiber Sg. The study of surface bundles in low dimensions unites ideas in the topology of manifolds of dimensions one, two, three, and four. The Virtual Fibering Conjecture (recently resolved) asserts that ...

Various optical methods for assessing the retinal nerve fiber layer (RNFL) depend on reflected light, but little is known about the characteristics of the RNFL as a reflecting structure. The authors investigated the angular dependence of light reflected by the unmyelinated nerve fibers of the toad eyecup using a small 500-nm light source that could illuminate the retina from various directions ...