Filters
Results 1 - 10 of 1031
Results 1 - 10 of 1031.
Search took: 0.019 seconds
| Sort by: date | relevance |
[en] Over the last several years, development of various measurement techniques in the nanosecond and pico-second range has led to increased reliance on streak cameras. This paper will present the main electronic and optoelectronic performances of the Thomson-CSF TSN 506 cameras and their associated devices used to build an automatic image acquisition and processing system (NORMA). A brief survey of the diversity and the spread of the use of high speed electronic cinematography will be illustrated by a few typical applications
[fr]
Le developpement, depuis plusieurs annees, de techniques de mesures variees dans les domaines de la nanoseconde et de la picoseconde conduit a une utilisation croissante des cameras electroniques a balayage. L'expose presente les principales performances electroniques et optoelectroniques des cameras Thomson-CSF TSN 506 ainsi que celles des dispositifs pouvant leur etre associes pour constituer un system automatique d'acquisition et de traitement d'images (systeme NORMA). Un apercu de la diversite et de l'etendue du domaine d'utilisation de la cinematographie electronique ultra-rapide est illustre par la description de quelques applications caracteristiquesJournal
[en] The spatiotemporal dynamics of the compression region of DT-gas filled micropellets was recorded using an optical streak camera in experiments on micropellet implosion in the Iskra-5 high-power laser facility. The experimental data agree with calculations and results of X-ray measurements.
Journal
[en] As the electron optics of their streak tubes require low light levels on the photocathode, to work properly, the use of an image amplification stage between the streak tube and the recorder (film or DTC) is most of time needed to match the low output signal of the streak tube to the recorder sensitivity. After a presentation of the methods suitable to measure the image intensifier performance we will demonstrate the advantages of double proximity focused MCP image intensifiers over electrostatic MCP and simple proximity focused diode intensifiers. We will then present some applications of image intensifiers in High Speed Photography: - chronometry measurements in detonics; - picosecond streak camera for temporal analysis of laser pulse shapes in laser matter interaction experiments; - electronic image readout of streak tubes by CCD
[fr]
Comme l'optique electronique des tubes a fente associes impose d'illuminer leurs photocathodes a bas niveau de lumiere, l'utilisation d'un etage d'amplification entre l'ecran de la camera et l'enregistrement par film ou le Dispositif a Transfert de Charges (DTC) est souvent necessaire pour adapter le signal lumineux du tube de la camera a la sensibilite du moyen utilise pour l'enregistrement. Apres une description des principales methodes d'evaluation des tubes intensificateurs d'images nous presenterons les principaux avantages lies aux tubes a galette de microcanaux et double focalisation de proximite par rapport aux tubes a focalisation electrostatique ou aux simples tubes diodes a focalisation de proximite. Nous verrons ensuite un certain nombre d'applications de ces tubes intensificateurs utilises en cinematographie ultra-rapide pour les experiences suivantes: - mesures de chronometrie en detonique; - analyse de la forme temporelle des impulsions des lasers de puissance a l'aide de cameras a balayage de fente picosecondes; - chaines de lecture electronique d'images de cameras a balayage de fente par DTCJournal
[en] Method for the study of transfer processes of X-ray radiation (XR) in closed cavities and in thermal breakdown mode is developed and described. Experiments are carried out on “Iskra-5” facility using two RFR-4 streak cameras. (paper)
Journal
Journal of Physics. Conference Series (Online); ISSN 1742-6596; 
; v. 666(1); [2 p.]
; v. 666(1); [2 p.]
[en] Temporal shaping of drive laser pulse was done by using pulse stacking method. Perfect result was measured by streak camera system. A quasi-ellipsoid shaping scheme based on pulse stacking was projected. The simulation results showed: pulse stacking is benefit to improve the beam emittance; 8 micro pulses stacking is more effective than 4 micro pulses stacking; besides, the beam emittance will be further improved by quasi-ellipsoid shaping. (authors)
Journal
High Power Laser and Particle Beams; ISSN 1001-4322; ; v. 23(7); p. 1894-1898
; v. 23(7); p. 1894-1898
[en] A time- and space-resolved technique to record the evolution of hot spots, local dense hot regions in plasma pinches is presented. Based on a modified form of the ADRRM 2-D x-ray streak technique reported previously, the new method allows the presence of hot spots to be recorded conclusively. The basics of the technique are described and the limitations of the system discussed. The technique has been applied to study the evolution of hot spots in a plasma focus operating with a mixture of Kr and D2. The results demonstrate that the presence and evolution of the hot spots can be recorded with spatial and temporal resolution in the range of mm and ns, respectively
Journal
[en] The factors that limit the temporal resolution in a streak camera operating in an accumulative mode were studied. By controlling the timing jitter, the transit-time dispersion and the technical resolution of the camera on the order of 100 fs, the role of the deflection dispersion was investigated experimentally. It was done by changing the electron beam size in the deflection plates with a variable slit in front of the plates. The temporal resolution of the camera reached 280 fs when the slit width was a 5 μm slit
Journal
| 1 | 2 | 3 | Next |