Warhead fragment position measurement method by using two light filed cameras

Li, Hanshan; Zhang, Xiaoqian; Yan, Keding

doi:10.1002/mop.31977

Cited by 3 publications

(2 citation statements)

References 7 publications

(7 reference statements)

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“…However, in addition to sound waves bouncing off the wall, and the sound waves of the two trajectories will interfere with each other. If the problems related to stipulation of structure size, cost increase, and inconvenient routine maintenance of the dual light field intersection imaging [4][5][6] are not considered, it can also be used to measure the coordinates measurement of projectiles under oblique incidence [7]. Limitations of the FLS in actual engineering cannot be ignored.…”

Section: Introductionmentioning

confidence: 99%

Coordinates measurement method under oblique incidence based on four-light-screen

Duan,

Ni,

2024

Speckle 2023: VIII International Conference on Speckle Metrology

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The Four-Light-Screen is often adopted for fire dispersion measurement of small arms. Due to gravitational acceleration and the muzzle vibration are always present, leading to projectile's velocity vector no-perpendicular to the target plane of the Four-Light-Screen, which is called the oblique incidence accordingly. The oblique incidence is violated the measurable conditions of the Four-Light-Screen measurement principle. Under the muzzle position measured in advance, the muzzle position after vibration is replaced to it. The connection between the muzzle and the coordinates measured by the Four-Light-Screen is approximated as the actual trajectory. Coordinates of oblique incidence projectiles measurement methods are proposed according to establishing the equation system between the actual trajectory equation and the four detection Light-Screen plane equations of the Four-Light-Screen. Both simulation and experimental results show that the proposed methods can measure coordinates of oblique incidence projectiles. The analysis and proposed coordinates measurement methods of oblique incidence bring much to the application of external ballistic parameters measurement of small arms.

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Section: Introductionmentioning

confidence: 99%

Coordinates measurement method under oblique incidence based on four-light-screen

Duan,

Ni,

2024

Speckle 2023: VIII International Conference on Speckle Metrology

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“…Compared to other measurement methods, high-speed imaging method can effectively reduce the consumption of manpower and material resources, and improve the efficiency of parameter measurement. High-speed imaging method can be divided into indirect imaging method, CCD camera intersection target method [9,10], and fragment trajectory measurement method [11][12][13][14][15]. Indirect imaging method include impact method [16] and perforation method [17], which obtain the spatio-temporal distribution parameters of fragments by recording the moment of detonation of the warhead with a high-speed camera, and the moment when fragments hit or pass through the target, combined with the position and time of fragments reaching to the target.…”

Section: Introductionmentioning

confidence: 99%

Research on a measurement method for spatio-temporal distribution of fragments based on a high-speed camera network

Zhou

Kong

2023

Meas. Sci. Technol.

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To reliably measure multiple spatio-temporal distribution parameters of fragments in the blast field, a measurement method for spatio-temporal distribution of fragments based on a high-speed camera network is proposed. The method is based on the principle of binocular stereo vision measurement and consists of four steps: fragment image acquisition, target detection of multi-view images, fitting of motion trajectory, and calculation of the spatio-temporal distribution parameters. The test results demonstrate that the method can simultaneously measure multiple parameters in the intersecting field of view. Compared with the measurement results of the array target, the absolute value of the measurement relative error of velocity was less than 1.5%, and the measurement results of scatter angle and distribution density were consistent. It indicates that the measurement results of the proposed method are reliable, and the method is a feasible and effective measurement method for spatio-temporal distribution parameters of fragments in the explosion filed.

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Motion measurements of explosive shock waves based on an event camera

Lei,

Guan,

Liang

et al. 2024

Opt. Express

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Shock wave measurement is vital in assessing explosive power and designing warheads. To obtain satisfactory observation data of explosive shock waves, it is preferable for optical sensors to possess high-dynamic range and high-time resolution capabilities. In this paper, the event camera is first employed to observe explosive shock waves, leveraging its high dynamic range and low latency. A comprehensive procedure is devised to measure the motion parameters of shock waves accurately. Firstly, the plane lines-based calibration method is proposed to compute the calibration parameters of the event camera, which utilizes the edge-sensitive characteristic of the event camera. Then, the fitted ellipse parameters of the shock wave are estimated based on the concise event data, which are gained by utilizing the characteristics of the event triggering and shock waves’ morphology. Finally, the geometric relationship between the ellipse parameters and the radius of the shock wave is derived, and the motion parameters of the shock wave are estimated. To verify the performance of our method, we compare our measurement results in the TNT explosion test with the pressure sensor results and empirical formula prediction. The relative measurement error compared to pressure sensors is the lowest at 0.33% and the highest at 7.58%. The experimental results verify the rationality and effectiveness of our methods.

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Warhead fragment position measurement method by using two light filed cameras

Cited by 3 publications

References 7 publications

Coordinates measurement method under oblique incidence based on four-light-screen

Coordinates measurement method under oblique incidence based on four-light-screen

Research on a measurement method for spatio-temporal distribution of fragments based on a high-speed camera network

Motion measurements of explosive shock waves based on an event camera

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