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Fiber comparison sheet for court science polarized light microscope inspection and preparation method thereof

A technology of polarized light and comparison sheet, which is applied in the field of forensic science micro-evidence analysis, which can solve the problem that the fiber comparison sheet cannot be purchased from the market.

Pending Publication Date: 2021-10-22
INST OF FORENSIC SCI OF MIN OF PUBLIC SECURITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to accurately identify the types of fibers involved in the case, it is necessary to use fiber comparison sheets for comparative inspection; however, fiber comparison sheets cannot be purchased from the market. Comparison sheets of common fibers in the field of analysis

Method used

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  • Fiber comparison sheet for court science polarized light microscope inspection and preparation method thereof
  • Fiber comparison sheet for court science polarized light microscope inspection and preparation method thereof
  • Fiber comparison sheet for court science polarized light microscope inspection and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment 1, the preparation of fiber comparison sheet

[0033] 1. Use scissors, tweezers and separation needles to separate natural fibers and chemical fiber textiles into several fibers about 2cm long.

[0034] 2. For commercially available solid Canadian gum, add about half the volume of xylene and stir in a warm place to promote the melting of the gum. The concentration of the melted gum should be such that the glue can flow down smoothly along one end of the glass rod.

[0035] 3. Take the slide with the marked area, and drop 1 drop of Canada gum on the end of the unmarked area of ​​the slide as a fixative;

[0036] 4. Take several fibers and place them horizontally in the gum on the glass slide. After fixing, take a few fibers and arrange them vertically in the gum to ensure that the placed fibers are in a mesh shape, such as figure 1 shown;

[0037] 5. Cover with a cover glass, press to remove air bubbles, and ensure that all fibers are on the same plane.

[...

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Abstract

The invention discloses a fiber comparison sheet for court science polarized light microscope inspection and a preparation method thereof. The preparation method comprises the following steps: S1, bonding a plurality of fibers of known materials on a glass slide to form a net shape; S2, covering a cover glass on the glass slide, drying, and marking a fiber type at one end of the glass slide; wherein the length of the fiber is 1-2cm; separating the fibers from a textile or fiber sample of known material using scissors, tweezers, and separation needles. The polarized light inspection of the fibers is mainly used for identifying and distinguishing the types by observing the interference characteristics of different fibers, and the requirement on practical experience is very high. The conditions that characteristics are difficult to confirm and the like often exist only through inspection of a single inspection material or sample, and different types of fibers and fibers of the same type, different manufacturers and different processes can be quickly, effectively and accurately identified and distinguished by comparing the fiber comparison sheet with a known result with the inspection material or sample.

Description

technical field [0001] The invention relates to a fiber comparison sheet for forensic science polarized light microscope inspection and a preparation method thereof, belonging to the field of forensic science micro-evidence analysis. Background technique [0002] Fiber is one of the common and important trace evidence in the field of forensic science, and it is often found at the scene of homicide, explosion, arson and other cases. Polarized light microscopy is an important method for inspecting fibers, and the types of fibers are determined by the interference characteristics of different types of fibers. However, due to differences in the interference characteristics of different types of fibers, the interference characteristics of fibers of the same type with different cross-sectional shapes, different colors, and different processes are also different. In order to accurately identify the types of fibers involved in the case, it is necessary to use fiber comparison sheet...

Claims

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Application Information

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IPC IPC(8): G01N21/84G01N21/01G01N1/28G01N1/34
CPCG01N21/84G01N21/01G01N1/2806G01N1/34G01N2021/0112
Inventor 王萍陶克明朱军李海燕郭洪玲孙振文刘占芳梅宏成乔婷张冠男胡灿李光耀周正郑继利李亚军
Owner INST OF FORENSIC SCI OF MIN OF PUBLIC SECURITY
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