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cCartridge case primer three-dimensional trace feature acquisition device and method

A bullet casing and bullet casing technology, which is applied in the field of criminal investigation and identification, can solve the problems of not being able to accurately reflect the depth of the trace depression and being easily affected by the sunlight environment, and achieve the effect of simple structure, low cost and heavy workload

Active Publication Date: 2020-07-24
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned patents use photographic imaging to collect two-dimensional trace images, which are easily affected by the sunlight environment and cannot accurately reflect the depth of the trace depressions.

Method used

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  • cCartridge case primer three-dimensional trace feature acquisition device and method
  • cCartridge case primer three-dimensional trace feature acquisition device and method
  • cCartridge case primer three-dimensional trace feature acquisition device and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] A three-dimensional trace feature acquisition device of bullet casing primer includes a loading slide table, a loading slide block, a two-dimensional angle platform, a bullet case clamp, a displacement sensor, a multi-dimensional adjustment platform, a control circuit and a computer. The loading slide table, the two-dimensional The angle platform, the displacement sensor, the multi-dimensional adjustment platform and the computer are all connected with the control circuit;

[0056] The loading slide is used for loading and unloading cartridge cases, and adjusting the distance between the cartridge case and the displacement sensor;

[0057] The loading slider is used to carry the two-dimensional angle platform and the cartridge case fixture, and can move along the X-axis along the screw rod under the control of the loading slide;

[0058] The two-dimensional angle platform is used to adjust the bottom plane of the cartridge case so that it rotates around the Y axis or th...

Embodiment 2

[0066] A method for collecting three-dimensional trace features of a bullet casing primer comprises the following steps:

[0067] Step 1, put the cartridge case to be tested into the cartridge case holder;

[0068] Step 2: Select at least three reference points for the bottom plane of the shell case in the bottom plane area of ​​the shell case. Among the line segments formed by the three points, at least one line segment is parallel to the Y axis, and the other line segment is perpendicular to it, and the coordinate values ​​of each point are transmitted to the control circuit. ;

[0069] Specifically, in step 2, the operator selects three reference points A, B, and C of the bottom plane of the shell case in the plane area of ​​the bottom plane of the shell case by inputting parameters in the computer, such as figure 2 shown. Among them, the line segment AB is parallel to the Y axis, and the line segment BC is perpendicular to the line segment. The computer transmits the A,...

Embodiment 3

[0093]The load slide table is a Kojin XA10A-L101 automatic single-axis slide table, the load slider is a customized aluminum alloy slider, the two-dimensional angle platform is a Kojin SA04B-RS02 two-dimensional angle platform, and the cartridge case clamp is an adjustable plastic clamp. The displacement sensor is Panasonic HL-G108A-RS-J laser point displacement sensor, the multi-dimensional adjustment platform is Seiko KWC06020-LG high-precision XYZ three-axis slide table, and the control circuit is a circuit control board with STM32F407 as the core. Take the shell traces with a scanning radius of 5[mm] as an example, set the scanning area length L=14[mm], height H=14[mm], scanning accuracy M=100 rows, N=100 columns, scanning K=6 group data.

[0094] First, the operator places the casing to be tested onto the gripper. Due to the damage and deformation of the shell itself or human operation, the bottom plane of the shell may not be perpendicular to the Z axis.

[0095] Furth...

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Abstract

The invention belongs to the field of criminal investigation identification, and particularly relates to a cartridge case primer three-dimensional trace feature acquisition device and method. The acquisition device comprises an object sliding table, an object sliding block, a two-dimensional angle platform, a cartridge case clamp, a displacement sensor, a multi-dimensional adjusting platform, a control circuit and a computer, and the object sliding table, the two-dimensional angle platform, the displacement sensor, the multi-dimensional adjusting platform and the computer are all connected with the control circuit; and the displacement sensor is used for measuring the distance between the displacement sensor and a measured trace on a cartridge case. A traditional microscope manual inspection method is low in efficiency, large in workload and prone to causing trace damage to the cartridge case; and according to the acquisition device, secondary damage to material evidences is avoided, and the workload is reduced.

Description

technical field [0001] The application belongs to the field of criminal investigation and identification, and in particular relates to a device and method for collecting three-dimensional trace characteristics of a bullet casing primer. Background technique [0002] In gun-related cases, bullet casings, as important physical evidence, are of great significance to case detection, criminal proceedings and legal identification, and the technology of bullet casing trace inspection is the key technology to give full play to the role of bullet casing physical evidence. Among the many trace features of the cartridge case, the shape and position of the trace left after the firing pin strikes the primer can be used as the main inspection feature when identifying a gun. At present, there are two main categories of primer trace inspection methods: manual identification and automatic identification. Manual identification involves a large number of manual operations, which may cause sec...

Claims

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Application Information

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IPC IPC(8): G01B11/24G01B11/22G01B17/00G01B17/06G06T17/00
CPCG01B11/22G01B11/24G01B17/00G01B17/06G06T17/00
Inventor 黄霖宇
Owner SICHUAN UNIV
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