The operation and test of a multi-spot digital sun sensor for precise sun-line determination is described. The image forming system consists of an opaque mask with multiple pinhole apertures producing multiple, simultaneous, spot-like images of the sun on the focal plane. The sun-line precision can be improved by averaging multiple simultaneous measures. Nevertheless, the sensor operation on a ...

The AIRIX flash X-RAY radiographic facility is now being characterized at Moronvilliers near REIMS. The 1.92 – 3.5 kA, 60 ns electron beam has been accelerated and transported through the 64 induction cells from 4 to 20 MeV (250 kV/cell). We present the acceptance tests of the machine, conducted with the 3.0 kA electron beam. We review in this paper, the characteristics and the performances of ...

Purpose: To evaluate the quality of three-dimensional (3D) CT angiography images of the abdominal viscera with small focal spot, low tube voltage, and iterative model reconstruction technique (IMR). Materials and Methods: Seven patients with suspected disease of the pancreatobiliary system had undergone CT with high-quality CTA protocol in the present study. There were 5 men and 2 women, rangin...

Wave-front correction and focal spot improvement of femtosecond laser beams have been achieved, for the first time to our knowledge, with a deformable mirror with an on-line single-shot three-wave lateral shearing interferometer diagnostic. Wave-front distortions of a 100-fs laser that are due to third-order nonlinear effects have been compensated for. This technique, which permits correction i...

The energy deposition efficiency and focal spot dynamics of electron beams produced by pulsed cold-cathode highvoltage glow discharges for metal surface treatment are investigated for two different cathode geometries. A concave cathode geometry in which the focusing is dominated by the convergence of the electric field lines in the cathode fall region is compared with a flat cathode in which th...

We analyzed the direct sampling (DS) method for diffractive lens encoding, using exact electromagnetic diffraction theory. In addition to previously published research [Pure Appl. Opt. 7, 565 (1998)] we present what we believe to be new results for TM polarization. We found that the validity of the scalar-based DS method is even more extended for TM than for TE polarization. Additionally, we fa...

An increase in achievable spatial resolution would enable application of flat-panel detector cone-beam CT (FPCBCT) in high-resolution applications, such as 3D breast and bone imaging. Improved reconstruction techniques exploiting more sophisticated models of noise and spatial resolution characteristics may provide such improvement. In this work, we propose a statistical model of measurement mea...

In this Letter, we present the photonic nanojet as a phenomenon in structured light generator system that is implemented to modify source focal spot size and emission angle. The optical comprises microlens array illuminated by focused Gaussian beam generate pattern far field. By introducing spheroid with different aspect ratios focus of beam, characteristics change, generated, which will engine...

Three-dimensional (3D) microstructures used in the formation of optical traps on axis near diffraction zone are calculated and studied. Subwavelength, variable-height annular gratings (a lattice period 1.05λ) with a standard graded-index (GRIN) substrate considered as microstructures. Two scenarios examined for changing refractive index n GRIN substrate: from maximum center to minimum at edges ...