High-speed velocity measurements on an EFI-system

Prinse, W.C.; Hof, P.G. van 't; Cheng, L.K.; Scholtes, J.H.G.

doi:10.1117/12.725402

Cited by 8 publications

(4 citation statements)

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“…Other studies have looked at increasing mass through increased flyer thickness and its influence on velocity. [33][34][35] Comparison between the signal modulation approach proposed herein and flyer mass increase is plotted in Figure 6; mass increase reduces the overall proportion of transit in stages 2-4 and increases the duration of stages 2-4 as well as stages 4-5. The ToAD is defined as in Figure 2; whilst the velocity profile is not typical of that observed, this is owing to the separation of leading and trailing surfaces, A and B respectively.…”

Section: Resultsmentioning

confidence: 99%

Modeling of the exploding foil initiator and related circuitry for the variable mode of operation

Borman

Dowding

Seddon

2019

Journal of Defense Modeling & Simulation

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Analytical and numerical models, validated against published data, were developed to calculate the velocity and time of arrival duration (ToAD) of the flyer-plasma material at the top of the barrel of an exploding foil initiator (EFI), as commonly used in explosive devices. Such tools will aid system designers in the optimization of capacitor discharge circuit (CDC) or EFI bridge material properties. The analytical elements of the approach developed support the requirement for the consideration of mass ejection variation with respect to initial capacitor voltage. The numerical elements of the approach developed demonstrate that EFI design alteration to increase flyer mass is less effective in reducing ToAD than supply voltage modulation via the CDC. This finding is of particular relevance for in situ control of functional performance characteristics. This work goes on to demonstrate that such control is impracticable when using hexanitrostilbene, since the initial capacitor voltages necessary to yield appropriate ToAD for deflagration deliver insufficient energy to instigate a response from the EFI.

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Section: Resultsmentioning

confidence: 99%

Modeling of the exploding foil initiator and related circuitry for the variable mode of operation

Borman

Dowding

Seddon

2019

Journal of Defense Modeling & Simulation

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“…In recent years, the components of the discharge circuit, the structure of the bridge foil, the material and dimension of the flyer and the barrel has become the major research field [4][5][6]. O'Brien et al point out that high voltage capacitor, Low jitter dielectric breakdown switch, trigger circuit, transmission line, explosive bridge foil and flyer can be formed in an integrated initiator system using the thin film deposition technology [7].…”

Section: Fig1 Schematic Illustration Side View Of An Initiator Operationmentioning

confidence: 99%

Key Fabrication Technology Research of Exploding Foil Initiator

Zeng

et al. 2013

AMM

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In order to realize consistency and low cost in the production process of the exploding foil initiator, the manufacturing method of exploding foil initiator was studied using micro processing technology. Microcrystalline glass was used as substrate, and magnetron sputtering,photolithography and wet etching technology were utilized to product the metal bridge foil on the surface of the substrate. SU-8 photoresist was used as the barrel material and scanning electron microscope was exploited to characterize structure of the initiator. Through the electrical tests, the flyer was successfully generated and after the barrel had a good integrity.

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“…Future development will be focused on FBG sensor array applications and on improving the performance of our fiber optic Fabry-Perot velocity measurement system, recently developed to measure object velocities from 100 m/s to 20 km/s. 5…”

Section: Continued On Next Pagementioning

confidence: 99%