GA/T 1445-2017 English PDF

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GA/T 1445-2017: Technical specifications for electrostatic appearance of impression writing in Forensics
Status: Valid

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Basic data

Standard ID: GA/T 1445-2017 (GA/T1445-2017)
Description (Translated English): Technical specifications for electrostatic appearance of impression writing in Forensics
Sector / Industry: Public Security (Police) Industry Standard (Recommended)
Classification of Chinese Standard: A92
Classification of International Standard: 13.310
Word Count Estimation: 6,646
Date of Issue: 2017-10-02
Date of Implementation: 2017-10-02
Issuing agency(ies): Ministry of Public Security

GA/T 1445-2017: Technical specifications for electrostatic appearance of impression writing in Forensics

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Technical specifications for electrostatic appearance of impression writing in Forensics ICS 13.310 A92 Public Safety Industry Standard of the People's Republic of China Forensic Science and Technology Published on.2017-10-02 2017-10-02 Implementation The Ministry of Public Security

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009. Please note that some of the contents of this document may involve patents. Publication of this document The agency does not assume responsibility for identifying these patents. This standard was proposed by the Technical Committee for Document Inspection and Sub-committee of the National Criminal Technology Standardization Technical Committee (SAC/TC179/SC10). In the mouth. This standard was drafted by. Ministry of Public Security Material Evidence Identification Center, Supreme People's Procuratorate Procuratorate Technical Information Research Center, China University of Political Science and Law, Division Legal Civilization Collaborative Innovation Center, Chongqing Municipal Public Security Bureau, Beijing Municipal Bureau of National Security Judicial Identification Center. The main drafters of this standard are. Yin Baohua, Wei Xiaoxuan, Liang Luning, Wang Weifu, Zhou Songdong, Liu Jianwei, Liu Xiaodong, Qi Fengliang, Lian Zhe, Gao Yonglun, Luo Hao. Forensic Science and Technology

1 Scope

This standard stipulates the forensic science equipment, equipment, laboratory environmental requirements, operating procedures, and inspection opinions. This standard applies to the appearance of indentation on paper in forensic science.

2 Normative references

The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article Pieces. For undated references, the latest version (including all amendments) applies to this document. GA/T 822-2009 Indentation Electrostatic Display Technology Requirements

3 appearance principle

After the polyester film is vacuum-adsorbed and stuck to the paper, it is charged several times by the high-pressure corona, and the indentation is adsorbed by more charges and other positional shapes. The potential difference makes the difference between the indentation location and other locations on the electrostatic powder adsorption capacity, so that the potential image on the polyester film is clearly displayed. Come out now.

4 Equipment and equipment

Equipment equipment includes. a) Static pressure tracer. in accordance with the technical requirements of GA/T 822-2009; b) Electrostatic powder. the average particle size is about 10μm; c) polyester film. colorless and transparent, thickness of about 6μm; d) transparent adhesive tape; e) Thermometer. graduation value 0.1 °C; f) Hygrometer. The division value is 1%.

5 Laboratory Environmental Requirements

Environmental requirements include. a) hygiene and cleanliness; b) well ventilated; c) Temperature. 22°C~28°C (recommended); d) Humidity. 60%~80% (recommended).

6 Operation steps

6.1 Adjust the temperature and humidity of the laboratory in accordance with the requirements of Chapter 5, and place the indentation file to be visualized in this environment for more than half an hour. ......

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