ประสิทธิภาพของเครื่องตรวจเอกสารสำ�หรับกระดาษที่ผ่านการกด (Thai)

This study aimed to know the effectiveness of oblique light for document examination in detecting indented writing on different types of papers and to study the properties of writing through the detected indented writing. Quantitative research was used, to determine that the oblique light source used to establish its effectiveness came from the left and right sides, ten millimeters above the sheet of paper, and the oblique light source at an angle of 10° to the level line. The study used different papers. - 70 and 80 gsm copy paper and 70 gsm report paper. It also studied the influence of pen types used in writing using gel ink pens and ballpoint pens, which, according to studies, showed that oblique light inside the proof of document examination a maximum of 3 sheets of indented writing on parchment sheets. Ballpoint pens writting on 70 gsm, 80 gsm, and report papers averaged 1.5, 1.2, and 1.2, respectively. Gel pens writting in 70 gsm, 80 gsm paper and report paper in the ink pen averaged 1.0, 1.0, and 0.8, respectively. Although the average number of sheets of paper detected for indented writing was different, according to the analysis of two variances factored at a statistical significance of p<0.05, different types of paper and pens did not affect the effectiveness of detecting pressure marks with a poof of document examination. The research will be useful in examining documentary evidence in forensic science. [ABSTRACT FROM AUTHOR]

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