Testing optical tracking of blast wave position for determination of its overpressure

Kučera, Jindřich; Anastacio, Aline Cardoso; Šelešovský, Jakub; Pachmáň, Jiří

doi:10.1109/miltechs.2017.7988733

Cited by 2 publications

(3 citation statements)

References 3 publications

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“…The location of any pixels which have light intensity changes along each ‘spoke’ are stored for each increment of angle and each frame. Due to the explosive charge being out of shot in each recording, the location was approximated through scaling-based calculations using the size of a pixel in the plane of the charge and known geometric relationships between the charge location, zebra board, camera and the pressure gauge in shot, following Gerasimov and Trepalov (2019) and Kucera et al (2017). Fiducial markers on the zebra board, spaced 1.23 m horizontally and 1.33 m vertically, were used to calculate the corresponding pixel size of ∼3 mm for video resolution of 1024 × 560.3.…”

Section: Methodsmentioning

confidence: 99%

“…More recent works by Hargather (2013) and Mizukaki et al (2014) both used background oriented schlieren methods during large-scale explosion events to obtain shock wave propagation velocities in order to estimate incident pressures. Kucera et al (2017) performed similar tests, recording propagating shock waves from smaller scale charges. The optically evaluated pressures from each of these studies demonstrated reasonable levels of agreement with gauge recordings between 0.8 and 5.2 m/kg 1/3 .…”

Section: Shock Wave Arrival Timementioning

confidence: 99%

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Time of arrival as a diagnostic for far-field high explosive blast waves

Farrimond

Rigby

Clarke

et al. 2022

International Journal of Protective Structures

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The ability to accurately determine blast loading parameters will enable more fundamental studies on the sources of blast parameter variability and their influence on the magnitude and form of the loading itself. This will ultimately lead to a better fundamental understanding of blast wave behaviour, and will result in more efficient and effective protective systems and enhanced resilience of critical infrastructure. This article presents a study on time of arrival as a diagnostic for far-field high explosive blasts, and makes use of the results from a large number of historic tests and newly performed experiments where the propagating shock front was filmed using a high-speed video (HSV) camera. A new method for optical shock tracking of far-field blast tests is developed and validated, and full-field arrival time results are compared against those determined from the historic data recorded using traditional pressure gauges. Arrival time variability is shown to be considerably lower than peak pressure and peak specific impulse, and is shown to decrease exponentially with increasing scaled distance. Further, the method presented in this article using HSV cameras to determine arrival time yields further reductions in variability. Finally, it is demonstrated that the method can be used to accurately determine far-field TNT equivalence of high explosives.

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Section: Methodsmentioning

confidence: 99%

Section: Shock Wave Arrival Timementioning

confidence: 99%

Time of arrival as a diagnostic for far-field high explosive blast waves

Farrimond

Rigby

Clarke

et al. 2022

International Journal of Protective Structures

View full text Add to dashboard Cite

show abstract

“…Jindrich Kucera utilized the RIA principle to examine the propagation velocity of shock wave overpressure through high-speed photography combined with a background curtain, thereby determining the overpressure value. The results were then compared with those obtained from free field sensor tests, showing better alignment with the overpressure peak [ 22 ]. Li Bin used the ripple velocity method to achieve a large equivalent blast field shock wave overpressure peak measurement, with test results demonstrating a relatively close correlation between the ripple velocity method and the pressure sensor test results [ 23 ].…”

Section: Introductionmentioning

confidence: 99%

Research on the Shock Wave Overpressure Peak Measurement Method Based on Equilateral Ternary Array

Zhang,

Peng,

Lin

et al. 2024

Sensors

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The measurement process of ground shock wave overpressure is influenced by complex field conditions, leading to notable errors in peak measurements. This study introduces a novel pressure measurement model that utilizes the Rankine−Hugoniot relation and an equilateral ternary array. The research delves into examining the influence of three key parameters (array size, shock wave incidence angle, and velocity) on the precision of pressure measurement through detailed simulations. The accuracy is compared with that of a dual-sensor array under the same conditions. Static explosion tests were conducted using bare charges of 0.3 kg and 3 kg TNT to verify the numerical simulation results. The findings indicate that the equilateral ternary array shock wave pressure measurement method demonstrates a strong anti-interference capability. It effectively reduces the peak overpressure error measured directly by the shock wave pressure sensor from 17.73% to 1.25% in the test environment. Furthermore, this method allows for velocity-based measurement of shock wave overpressure peaks in all propagation direction, with a maximum measurement error of 3.59% for shock wave overpressure peaks ≤ 9.08 MPa.

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Testing optical tracking of blast wave position for determination of its overpressure

Cited by 2 publications

References 3 publications

Time of arrival as a diagnostic for far-field high explosive blast waves

Time of arrival as a diagnostic for far-field high explosive blast waves

Research on the Shock Wave Overpressure Peak Measurement Method Based on Equilateral Ternary Array

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