Interferometry by Holography

Ostrovsky, Yuri; Butusov, M. M.; Ostrovskaya, G. V.

doi:10.1007/978-3-540-39008-4

Cited by 114 publications

(50 citation statements)

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“…Apart from this we made a holographic interferogram of the object [17,16], thus determining the phase shift of light introduced by the hot air flow. A hologram of the object is taken before switching it on and the undisturbed wavefronts coming from the object are stored this way.…”

Section: Description Of the Experimentsmentioning

confidence: 99%

Comparison of Different Methods of Abel Inversion Using Computer Simulated and Experimental Side-On Data

Pretzier

Jäger

Neger

et al. 1992

Zeitschrift Für Naturforschung A

113

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A recently devised new method for numerical Abel inversion is compared with four other commonly used methods. One of them, the convolution method, is employed in computer tomography for reconstructing asymmetrical objects. It is investigated whether this method can be adapted for the case of radial symmetry.As a first approach the comparison is performed by computer simulation. Special attention is given to the propagation of errors according to their origin. The result is a recipe for minimizing errors and for choosing the optimal method for reconstruction.The second step is a comparison of experimentally obtained radial profiles with functions resulting from Abel inversion of measured side-on data. Thus it is shown that the concept developed by computer simulation can be applied in practice.

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Section: Description Of the Experimentsmentioning

confidence: 99%

Comparison of Different Methods of Abel Inversion Using Computer Simulated and Experimental Side-On Data

Pretzier

Jäger

Neger

et al. 1992

Zeitschrift Für Naturforschung A

113

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show abstract

“…This electromagnetic wave is typically in the optical frequency region of the spectrum. These techniques have been used and developed before [52] …”

Section: Diagnosticsmentioning

confidence: 99%

Plasma channel and Z-pinch dynamics for heavy ion transport

Ponce-Marquez¹

2002

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A self stabilized, free standing, z-pinch plasma channel has been proposed to deliver the high intensity heavy ion beam from the end of a driver to the fuel target in a heavy ion inertial fusion power plant. The z-pinch relaxes emittance and energy spread requirements requiring a lower cost driver. A z-pinch transport would reduce the number of beam entry port holes to the target chamber from over a hundred to four as compared to neutralized ballistic focusing thus reducing the driver hardware exposure to neutron flux. Experiments where a double pulse discharge technique is used, z-pinch plasma channels with enhanced stability are achieved. Typical parameters are 7 kV pre-pulse discharge and 30 kV main bank discharge with 50 kA of channel current in a 7 torr background gas atmosphere. This work is an experimental study of these plasma channels examining the relevant physics necessary to understand and model such plasmas. Laser diagnostics measured the dynamical properties 2 of neutrals and plasma. Schlieren and phase contrast techniques probe the pre-pulse gas dynamics and infrared interferometry and faraday effect polarimetry are used on the zpinch to study its electron density and current distribution. Stability and repeatability of the z-pinch depend on the initial conditions set by the pre-pulse. Results show that the z-pinch channel is wall stabilized by an on-axis gas density depression created by the pre-pulse through hydrodynamic expansion where the ratio of the initial gas density to the final gas density is > 10/1. The low on-axis density favors avalanching along the desired path for the main bank discharge. Pinch time is around 2 µs from the main bank discharge initiation with a FWHM of ≈ 2 cm. Results also show that typical main bank discharge plasma densities reach 10 17 cm −3 peak on axis for a 30 kV, 7 torr gas nitrogen discharge.Current rise time is limited by the circuit-channel inductance with the highest contribution to the impedance due to the plasma. There is no direct evidence of surface currents due to high frequency skin effects and magnetic field experiments indicate that > 70% of the current carried by the channel is enclosed within FWHM of the channel. Code-experiment benchmark comparisons show that simulations capture the main mechanisms of the channel evolution, but complete atomic models need to be incorporated.

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“…The cloud symmetrically opposite is labeled -a because it is the -1 diffraction order and, therefore, possesses a wave front that is inverted (or the mirror image) with respect to wave front a. 8 For purposes of clarity, light of other diffraction orders, including higher-order and combined-order diffractions, is not labeled.…”

Section: Scheme 11mentioning

confidence: 99%

Displacement fields (U,W) obtained simultaneously by moiré interferometry

Basehore

Post

1982

Appl. Opt.

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A high-frequency phase grating on a specimen surface is illuminated symmetrically by two oblique beams.The diffracted beams emerge with wave front warpages that define both the in-plane U and out-of-plane W displacement fields. Contour maps of these wave fronts, with added carrier fringes, are obtained as a single photographic record. They are manipulated by moir6 and optical filtering steps to yield whole-field fringe patterns of U and W. Sensitivities of 0.833 ,um/fringe (32.8 ,in./fringe) for in-plane displacements and 0.132,um/fringe (5.2 Ain./fringe) for out-of-plane displacements were demonstrated.Since data acquisition is experimentally simple, dynamic as well as static analyses are applicable.

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Interferometry by Holography

Abstract: Softcover reprint of the hardcover 1st edition 1980The use of registered names, trademarks, etc. in this publication does not imply, even in the absence of a specific statement, that such names are exempt from the relevant protective laws and regulations and therefore free for general use.

Cited by 114 publications

References 0 publications

Comparison of Different Methods of Abel Inversion Using Computer Simulated and Experimental Side-On Data

Comparison of Different Methods of Abel Inversion Using Computer Simulated and Experimental Side-On Data

Plasma channel and Z-pinch dynamics for heavy ion transport

Displacement fields (U,W) obtained simultaneously by moiré interferometry

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