Portable miniature text detector

Abstract

The invention discloses a portable miniature text detector. The detector comprises a box cover, and a display screen is embedded in the inner wall of a box cover; a large gear disc is arranged on a middle supporting plate in the box body; absorption optical filters with different wave bands are arranged on the large gear disc; one absorption optical filter is aligned with the detection window on the middle supporting plate; the large gear disc is connected with an adjusting mechanism in a meshed mode; a camera and a camera obscura shell are fixed at the bottom of the top plate; and a light inlet is formed in the bottom face of the camera obscura shell and located above the detection window, a light outlet is formed in the side face of the camera obscura shell, a reflector A and a reflectorB which are obliquely arranged are fixed in the camera obscura shell, and finally a detection material imaging light path with the reflector A refracted by 90 degrees horizontally relative to the camera and the reflector B refracted by 90 degrees reversely relative to the camera is formed. A plurality of excitation light sources with different wavelengths distributed around the detection window are arranged at the bottom of the middle supporting plate. The structure text detector is not influenced by the size and the thickness of a detected material; and the portable miniature text detector can be used for identifying addition, covering, correction, fading and the like of characters.

Description

technical field [0001] The invention relates to an inspection device for alteration and alteration traces of bills, certificates and documents, in particular to a portable miniature document inspection instrument. Background technique [0002] In public security, judicial, procuratorial, customs, quality inspection and other departments, it is often necessary to check and verify certain documents, certificates, declarations, invoices, etc. to identify their authenticity. Document inspection is a technical science that analyzes and identifies suspicious documents and evidence involved in order to determine the relationship between the document and the facts of the case and its relationship with a certain person. When observing documents and physical evidence with the naked eye under natural light conditions, the handwriting of the materials is often very similar, and there is no obvious difference in color, luster, shade, etc. However, due to the different formulations of wri...

AI Technical Summary

Problems solved by technology

[0003] When physical evidence judicial appraisal institutions are involved in criminal cases and civil cases, they often have to go out to collect evidence and inspect. The disadvantages of the traditional desktop document inspection instrument are: the physical examination is too large to carry; the workbench area and focal length are relatively fixed, so it is not suitable for large-scale inspection materials and Excessively thick inspection materials; during the inspection operation, the inspection materials need to be moved continuously by hand, causing the spectrum box to not be completely closed, and the inspection effect is interfered by external stray light

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