| A18.1816 Questioned Document Examination Analyzer |
| Light Source System | Main Light Source : 1x 24V/150W Halogen Lamp, with cooling fan, focusing lens, and heat-resistance glass cover |
| UVC: short-wave ultraviolet light 254nm, 1x10W |
| UVA: long-wave ultraviolet light 365nm, 1x10W |
| Upper visible side light: 1x50W, with lamp holder which can adjust position and angle freely, used to check indentation |
| Transmitted white light 2x20W |
| Excitation Wavelength: 000nm,365nm,450nm,465nm,515nm,530nm,565nm,580nm,900nm |
| Receiving Filter: 000nm,415nm,450nm,565nm,700nm,720nm,740nm,800nm,900nm |
| Video Camera System | High sensitive, high resolution 1/3” CCD color digital camera, 650 lines, sensitivity 0.001 Lux, especially sensitive to Near-infrared and visible spectral bands light source. |
| Electrical zoom lens, aperture 1.2, zoom ranges 1~30x |
| Function | Fluorescent light source with multi excitation and receiving filter combinations, can exam and compare the different inks used on documents |
| Reflect light and receiving filter combination, can exam the reflection and absorption of different wavelengths on different inks. |
| Reflect light and receiving filter combination, can exam the transmission of different wavelength infrared light on the different inks. |
| Transmit light and receiving filter combination, can exam the transmission of different wavelength infrared light on the different inks |
| Reflect side light can exam the scratch, cut marks on documents. |
| Transmit light can illuminate from the bottom side to exam the scratch, cut marks on documents. |
| Samples to choose light source according to different objects. | | Objects | Light Source | Excitation | Receiving | Exam | | Distinguish altered or added text by different kinds of ink | Excitation | 485-550 nm | 700-900 nm | Alter | | Natural subside text on thermal paper, carbon paper | Excitation | 480-550 nm | 700-740 nm | Subside | | Phosphor fingerprint | Excitation | 480-550 nm | 700-740 nm | Fluorescent | | Multilayer indentation | Reflected Light _ Side | 000nm | 900nm | Indentation | | Text on the black cloth | Reflected Light _ Side | 000nm | 900nm | Covered Text | | Text in the Kraftpaper envelopes | Transmitted Light _ UV | 000nm | 900nm | Transmit | | Correction Fluid | Transmitted Light _ UV | 000nm | 900nm | Alter | | Security Trademark | UVC | 000nm | 000nm | Real/False | | Currency Fluorescent | UVA | 000nm | 000nm | Fluorescent | |
