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High polymer bonding explosive density distribution detection method based on capacitive tomography

A technology of capacitance tomography and density distribution, which is applied in the direction of material capacitance, material analysis through electromagnetic means, and measurement devices, which can solve the problems of insufficient accuracy and impenetrability

Active Publication Date: 2019-11-12
INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS
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Problems solved by technology

[0003] At present, the CT method is mainly used to measure the density distribution of PBX materials, but for large-scale PBX specimens, it has the problems of impenetrability and insufficient accuracy.

Method used

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  • High polymer bonding explosive density distribution detection method based on capacitive tomography
  • High polymer bonding explosive density distribution detection method based on capacitive tomography
  • High polymer bonding explosive density distribution detection method based on capacitive tomography

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Embodiment 1

[0064] A method for detecting the density distribution of high polymer bonded explosives based on electrical capacitance tomography, comprising the steps of:

[0065] Step 1: Determine the relative permittivity of PBX specimen materials with different densities, such as figure 2 As shown, and establish the PBX material relative permittivity-PBX material density model, the specific steps are as follows:

[0066] 1) The PBX material is a two-phase composite material composed of explosive crystals and binders. The binder and explosive crystals in the PBX material have different dielectric constants. When the content distribution of explosive crystals is different, the density distribution of the PBX material is different. Its dielectric constant will also change, so the detection of its density distribution can be realized by detecting the distribution of the dielectric constant of the PBX material; since the low-frequency electromagnetic wave is applied during the detection, th...

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Abstract

The invention discloses a high polymer bonding explosive density distribution detection method based on capacitive tomography. A capacitance value between parallel plates is measured through a parallel plate capacitance method, relative dielectric constants of PBX materials under different densities are obtained through calculation, and a PBX material density value and a dielectric constant modelare established; a capacitance tomography system is built, the capacitance value between array electrode pairs of a to-be-tested PBX test piece array are measured in sequence, and three-dimensional reconstruction is carried out on the relative dielectric constant distribution of the PBX materials according to the measured capacitance value and the sensitivity matrix between all the electrode pairs; and according to the relative dielectric constant of the PBX material-PBX material density model, the density distribution of the PBX test piece is obtained, and detection of the density distribution of the PBX test piece is realized. According to the method, the density distribution of the PBX test piece can be quantitatively detected, and the method has the advantages of no damage, high efficiency and large detection range / portability, and can be widely applied to detection of density distribution determination and density uniformity of PBX test pieces.

Description

technical field [0001] The invention relates to the technical field of density uniformity detection of polymer bonded explosives, in particular to a method for detecting density distribution of polymer bonded explosives based on electrical capacitance tomography. Background technique [0002] Polymer Bonded Explosives (PBX, Polymer Bonded Explosives) is a particle-filled composite material bonded by explosive crystals and polymer binders. It has been widely used in various types of weapons. The compression molding process is the transition process of explosive crystals from a loose state to a dense state. The complexity of the compression process may cause uneven distribution of explosive crystals, which eventually leads to uneven density distribution of the formed PBX material. On the other hand, the aging process will also cause changes in the PBX density distribution, and the uneven distribution of PBX density will affect the detonation performance and safety of explosive...

Claims

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Application Information

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IPC IPC(8): G01N27/22G01N9/36
CPCG01N9/36G01N27/22G01N27/221
Inventor 肖盼朱慧娴张伟斌杨健徐尧罗卓童杨占锋李海宁李丽何荣芳陶杰
Owner INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS
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