Free-field microwave interferometry for detonation front tracking and run-to-detonation measurements

Rae, Philip; Glover, Brian; Gunderson, Jake Alfred; Perry, W. Lee

doi:10.1063/1.3686311

Cited by 6 publications

(4 citation statements)

References 10 publications

(11 reference statements)

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“…Another application is the characterization of detonation properties [4] where the parameter of interest is the detonation velocity. Several techniques exist for measuring this key indicator, such as, electronic pins [5], Fiber Bragg Grating systems [6] or Radio-InterFerometry (RIF) [7]. The RIF techniques require the knowledge of the dielectric constant (or real part of the relative dielectric permittivity) of the sample under study, for which several static methods exist, such as, e. g., open-ended coaxial probe techniques, transmission line methods, resonant cavity setup [8] or reflectivity-based methods [9].…”

Section: Introductionmentioning

confidence: 99%

Static and Dynamic Permittivity Measurement of High Explosives in the W Band to Investigate Shock and Detonation Phenomena

Rougier

Lefrançois

Chuzeville

et al. 2018

Propellants Explo Pyrotec

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Radio interferometry techniques are often used to investigate shock and detonation phenomena thanks to the radio‐transparency of high explosives in the gigahertz frequency band. These techniques require the knowledge of the permittivity of studied explosives. Although the permittivity has been thoroughly studied for many materials, very few data are available at high frequencies (>75 GHz) for high explosives. In this paper, we report static measurement data of the permittivity for various reactive materials using the standard line transmission method between 75 GHz and 110 GHz (W frequency Band), and we present dynamic measurement results at 94 GHz obtained from the so‐called detonation wavefront tracking method. It is shown that the measurement results provided by these two methods are in good agreement. As a consequence, this work validates the detonation wavefront tracking method for the dynamic measurement of high explosives permittivity, and shows that the static experimental results are relevant for shock wave propagation analysis from millimeter‐wave measurement techniques.

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Section: Introductionmentioning

confidence: 99%

Static and Dynamic Permittivity Measurement of High Explosives in the W Band to Investigate Shock and Detonation Phenomena

Rougier

Lefrançois

Chuzeville

et al. 2018

Propellants Explo Pyrotec

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“…The measure of these quantities allows the determination of behavior laws for shocked materials for simulation purposes. Fiber Bragg Gratings [2] and shorting pins [3] are commonly used to measure the shock wave velocity, but such measurements are invasive. The particle velocity after an impact is classically derived from laser interferometry techniques [4], but the shocked material must be optically transparent.…”

Section: Introductionmentioning

confidence: 99%

Measurement of Shock Wave and Particle Velocities in Shocked Dielectric Material from Millimeter-Wave Remote Sensing

Rougier

Aubert²,

Lefrançois

2018

2018 48th European Microwave Conference (EuMC)

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A millimeter-wave remote sensing technique is used here as a noninvasive and continuous approach for the real-time measurement of shock wave velocity as well as the velocity of the shocked dielectric material during an impact. Experimental results obtained from planar symmetric impacts on PolyMethyl MethAcrylate (PMMA) cylinders are discussed and demonstrate that the proposed millimeter-wave remote sensing technique is highly convenient for deriving both the velocity of the shock wave and velocity of the shocked PMMA material. The proposed approach is applicable to any dielectric material subject to an impact and is an excellent candidate for deriving the equation of state of shocked materials.

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“…Four different tests were taken using the configuration of Launcher 1 with no wax. These are Tests # [16][17][18][19]. in R 2 between any two tests is less than 1% for 75% of the frequencies.…”

Section: Results Repeatability Testingmentioning

confidence: 99%

“…Another MI study observes detonation velocity changes in the interface between explosives [3]. Other recent uses of MI include measuring detonation fronts and run-to-detonations [16].…”

Section: Early Work On MImentioning

confidence: 99%

Microwave Interferometry Diagnostic Applications for Measurements of Explosives

Kline¹

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Microwave interferometry (MI) is a Doppler based diagnostic tool used to measure the detonation velocity of explosives, which has applications to explosive safety. The geometry used in existing MI experiments is cylindrical explosives pellets layered in a cylindrical case. It is of interest to Lawrence Livermore National Labs to measure additional geometries that may be overmoded, meaning that the geometries propagate higher-order transverse electromagnetic waves. The goal of my project is to measure and analyze the input reflection from a novel structure and to find a good frequency to use in an experiment using this structure. Two methods of determining a good frequency are applied to the phase of the input reflection. The first method is R 2 , used to measure the linearity of input reflection phase. The second is a zerocrossing method that measures how periodic the input reflection phase is. Frequencies with R 2 values higher than 0.995 may be usable for an experiment in the novel structure.

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Free-field microwave interferometry for detonation front tracking and run-to-detonation measurements

Cited by 6 publications

References 10 publications

Static and Dynamic Permittivity Measurement of High Explosives in the W Band to Investigate Shock and Detonation Phenomena

Static and Dynamic Permittivity Measurement of High Explosives in the W Band to Investigate Shock and Detonation Phenomena

Measurement of Shock Wave and Particle Velocities in Shocked Dielectric Material from Millimeter-Wave Remote Sensing

Microwave Interferometry Diagnostic Applications for Measurements of Explosives

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