High-speed photographic studies of laser-triggered spark gap

1968 ◽  
Vol 56 (11) ◽  
pp. 2090-2092 ◽  
Author(s):  
K. Ujihara
Keyword(s):  
High Speed ◽  
Spark Gap ◽  
Photographic Studies

Paper F–5: High-Speed Photographic Studies of Electrically Exploded Metal Films and Wires

1962 ◽  
Vol 71 (1A) ◽  
pp. 283-289
Author(s):  
Louis Zernow ◽  
George Woffinden ◽  
Fulton W. Wright
Keyword(s):  
High Speed ◽  
Metal Films ◽  
Photographic Studies

scholarly journals Estimation of Current Density Using High-Speed-Camera Recordings in a Model Spark Gap during Surge Currents

2019 ◽  
Vol 6 (1) ◽  
pp. 60-64
Author(s):  
T. H. Kopp ◽  
E. Peters ◽  
M. Kurrat
Keyword(s):  
Current Density ◽  
Radiation Intensity ◽  
High Speed ◽  
Experimental Investigations ◽  
High Speed Camera ◽  
Spark Gap ◽  
Plasma State ◽  
Development Processes ◽  
Current Densities ◽  
Short Time

<p>For experimental investigations of short time plasma in spark gaps, as used in surge protective devices, high-speed camera recordings are used frequently. The analysis of these recordings provides further details regarding the plasma state and distribution. These deduced details are used to assist research and development processes. <br />To increase the benefit of high-speed camera recordings an empirical model is presented to improve the picture analysis. In this model the recorded radiation intensity is empirically related to the current density within a spark gap. Therefore a specially adapted model spark gap was developed and tested. In this model spark gap areas with homogenous current densities occur. These current densities are determined in the experimental setup through current measurements with separated electrodes. Additionally, the relative radiation intensity between the electrodes is identified using high-speed camera recordings. An empirical correlation between these two measurement values was found and is discussed. <br />It confirmed that the determined correlation improve the mostly intuitive interpretation of high speed camera recordings in spark gaps.</p>

Local fuel concentration, ignition and combustion in a stratified charge spark combustion in a stratified charge spark ignited direct injection engine: Spectroscopic, imaging and pressure-based measurements

2003 ◽  
Vol 4 (2) ◽  
pp. 61-86 ◽  
Author(s):  
T. D. Fansler ◽  
M. C. Drake ◽  
B Stojkovic ◽  
M. E. Rosalik
Keyword(s):  
High Speed ◽  
Equivalence Ratio ◽  
Direct Injection ◽  
Injection Timing ◽  
Cylinder Pressure ◽  
Engine Operation ◽  
Stratified Charge ◽  
Fuel Concentration ◽  
Spark Gap ◽  
Ignition And Combustion

A recently developed spark emission spec-troscopy technique has been used to measure the effects of fuel injection timing, spark timing and intake swirl level on the individual-cycle fuel concentration at the spark gap in a wall-guided spark ignited direct injection (SIDI) engine. The fuel-concentration measurements were made simultaneously with measurements of individual-cycle spark discharge energy and cylinder pressure. Endoscopic imaging of the fuel spray and high-speed imaging of combustion (both broadband and spectrally resolved) augment these quantitative data. For optimum engine operation, the fuel-air equivalence ratio at the spark gap just after spark breakdown is rich on average (〈φ〉 ≈1.4–1.5) and varies widely from cycle to cycle (∼25 per cent). The evolution with crank angle of the mean equivalence ratio and its cycle-to-cycle fluctuations are correlated with the cylinder pressure, heat release and imaging data to provide insights into fuel transport and mixture preparation that are important to understanding and optimizing ignition and combustion in SIDI engines. For example, causes of misfires and partial burns have been determined.

High-speed photographic studies of impact on thin layers of emulsion explosive

1984 ◽  
Vol 9 (3) ◽  
pp. 77-81 ◽  
Author(s):  
V. Krishna Mohan ◽  
J. E. Field ◽  
G. M. Swallowe
Keyword(s):  
High Speed ◽  
Thin Layers ◽  
Emulsion Explosive ◽  
Photographic Studies
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