显微拉曼光谱检验射击残留物

doi:10.3964/j.issn.1000-0593(2021)10-3142-05

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Abstract To establish a method to use Raman Microscope Imaging Spectrometer to inspect the propellant powder, the product after the propellant combustion, and the shooting residue. Collect the propellant particles of the imitation 9×19 Balabellum pistol ammunition and the combustion product of the “QSZ92” 9 mm pistol propellant and extract the shooting residue from the shooter’s hand, the shooting residue in the barrel and the target. Shoot the residue on the target. The Raman Microscope Imaging Spectrometer was used to perform Raman detection on the collected propellant gunpowder, gunpowder combustion products and shooting residue samples. The experiment found that 455 nm laser should be used to detect the above samples. This wavelength laser can effectively avoid the interference of fluorescence; the laser intensity is 6.0 mW, the energy Raman intensity can reach the maximum, and it can be better distinguished from other impurity peaks; observe the objective lens at the same time choose the 50 times condition. Under these multiple conditions, the microscopic morphological characteristics of the sample to be tested can be seen, and the Raman signal can be absorbed to the greatest extent. Using the above parameters, the Raman signal obtained by the sample to be tested has the best effect. The results of the detection spectrum of Raman spectroscopy proved that the main components of the gunpowder, the composition after the burning of the gunpowder and the shooting residue extracted from other parts were basically the same, and these components were mainly derived from the organic components in the sample to be tested. After the gunpowder is burned, the Raman intensity of some parts of the gunpowder and other parts extracted from the shooting residue has decreased and changed relative to the fired gunpowder. The fluorescence phenomenon has been strengthened in the experiment, which proves that certain specific components will change after the shooting. Under the condition of a 50x objective lens, the microscopic morphology is highly comparable. It is found that the surface of the object to be tested has the characteristics of the black and bright surface, collapsed voids and cracks. These characteristics can be regarded as the typical microscopic morphological features of different types of samples to be tested and can also be used as a judgment shot strong evidence of residue. This method can use Raman spectroscopy to perform non-destructive testing of propelled gunpowder, products after burning of gunpowder, and shooting residues, which meets the current spectral inspection and forensic inspection requirements for such samples. At the same time, the method has high sensitivity, fast analysis speed and easy operation.

Key words：Microscopic Raman spectrometer; Shooting residue; Raman spectrum; Microscopic features

Received: 2020-10-09 Accepted: 2021-02-04

ZTFLH:

O657.37

Corresponding Authors: CAI Jing E-mail: caijing@zjjcxy.cn

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http://www.gpxygpfx.com/EN/10.3964/j.issn.1000-0593(2021)10-3142-05 OR http://www.gpxygpfx.com/EN/Y2021/V41/I10/3142