光学指纹比对仪——双路同步光学投影·6.5倍/10倍两档放大·宽屏观察·指纹/文件/工具痕迹并排比对检验系统

 光学指纹比对仪——双路同步光学投影·6.5倍/10倍两档放大·宽屏观察·指纹/文件/工具痕迹并排比对检验系统

〖重要合规前置声明〗 本产品为国家管制类刑事技术检验鉴定专用特种装备，仅面向具备法定执法权限与司法鉴定资质的各级公安机关刑事技术部门、人民检察院技术部门、司法鉴定机构及授权刑事技术实验室定向研发、生产与供应，严禁向任何个人、无资质企业及非授权单位销售或提供。本设备的购置、配备、使用与管理，必须严格遵守《中华人民共和国刑事诉讼法》《司法鉴定程序通则》《公安机关刑事案件现场勘验检查规则》及国家关于刑事技术装备管理的相关法律法规与行业技术标准，必须由经过专业培训、取得相应刑事技术或痕迹/文件检验岗位资质的人员规范操作，严禁无资质单位和个人违规购置、使用、转让本装备。

产品概述

光学指纹比对仪——双路同步光学投影·6.5倍/10倍两档放大·宽屏观察·指纹/文件/工具痕迹并排比对检验系统（亦称FX-8B型光学投影比对仪、光学投影比对仪）是一款基于光学反射投影原理的专业刑侦技术装备，属于公安刑事技术指纹检验、文件检验及工具痕迹比对领域的经典光学检验设备。该产品专为将两个物证样本的图像同步、清晰地投影至观察屏上进行并排放大观察与细节特征比对深度定制，通过双路独立光路将放置在载物台上的两个待检样本分别放大后并排投影至同一显示屏上，提供两档可选放大倍率，投影屏尺寸最小不小于192mm×165mm，完美适配指纹与掌纹的人工比对与综合评断、文件检验中笔迹与印章印文的细节特征分析、工具痕迹的宏观轮廓与线纹匹配比对及刑事技术教学与多人协同会检等多种专业场景，是从光学成像维度支撑物证鉴定科学性与客观性的基础性检验装备。

技术原理

该仪器基于反射式光学投影原理工作。系统内置两路独立的光学投影通道，每路通道均由光源、聚光镜组、物镜及反射镜组构成。照明系统采用约300W/120V的卤素灯，提供充足且可调的亮度。光源发出的光线经聚光镜组汇聚后照射至载物台上的待检样本表面，样本反射的光线携带其表面形态信息，经物镜放大后通过反射镜组投射至观察屏上。两路通道各自独立成像，最终在观察屏上并排显示两个样本的放大图像。

系统提供6.5倍与10倍两档可选放大倍率：在6.5倍率下，物方视场范围约为29.8mm×25.5mm，工作距离约为80mm；在10倍率下，物方视场范围约为19.4mm×16.6mm，工作距离约为47mm。调焦范围约为90mm，检验人员可根据样本厚度与观察需求灵活调节焦距。投影屏尺寸最小不小于192mm×165mm，检验人员可采取更为舒适的姿势进行观察与讨论，显著减轻视觉与身体疲劳。设备电源为AC 220V/50Hz。

核心功能与合规实战价值

双路同步投影与并排比对，为指纹同一认定与文件真伪鉴定提供直观可靠的光学分析平台

设备可将现场提取的指纹样本与嫌疑人指纹样本分别置于两路载物台上，经独立光路放大后并排投影至同一观察屏上，检验人员可直接观察两枚指纹的纹型、细节特征点的形态、位置及相互关系，进行人工比对与综合评断。在文件检验中，可并排显示可疑文件与标准样本，分析笔画顺序、墨水洇散、印刷特征、印文重合度及微观形态差异。该双路同步投影并排比对能力将原本需要通过显微镜单眼轮流观察的两个样本转化为同屏同步显示，使特征之间的符合点与差异点一目了然，有效降低了因记忆偏差或观察顺序差异导致的误判风险。

宽屏投影与优化观测体验，提升长时间检验工作的持续性与舒适度

设备将显微图像投影至较大的观察屏上，检验人员无需双眼紧贴目镜筒，可以采取更自然、放松的坐姿进行观察。该宽屏投影设计有效降低了传统显微镜长时间目视观察带来的视觉与身体疲劳感，使检验人员能够在连续数小时的精细比对作业中保持稳定的检验质量。在疑难案件会诊中，大屏幕投影特性使多位专家可同时观察、同步讨论，无需轮流中断检验来让每个人逐一通过目镜观察，显著提升了协同会检的效率与结论可靠性。

两档放大倍率与广泛样本适应性，覆盖从宏观轮廓分析到微观细节比对的多种检验需求

系统提供6.5倍与10倍两档可选放大倍率，低倍率下视场范围更大，适用于痕迹的宏观定位与整体形态分析；高倍率下细节更清晰，适用于纹线特征点、笔画交叉点等微观细节的精细比对。设备适用于具有一定反射能力的表面物证，如指纹卡片、纸张、文件、部分金属或塑料表面上的痕迹等，可满足指纹检验、文件检验及工具痕迹初步比对等多种专业场景的检验需求。

合规应用场景

指纹与掌纹的人工比对与综合评断场景

在指纹同一认定中，检验人员使用本设备将现场提取的指纹与嫌疑人指纹样本并排投影至观察屏上，在6.5倍或10倍放大倍率下直接观察纹型、细节特征点的形态、位置及相互关系，进行系统的人工比对与综合评断。该经典光学比对方法是数字化自动识别系统的重要补充手段，尤其适用于低质量、残缺或变形指纹的深度分析与特征确认。

文件检验中的笔迹与印章印文比对场景

在文件检验鉴定中，检验人员使用本设备对可疑文件与标准样本进行并排投影比对，通过高倍放大观察笔画顺序、墨水洇散特征、印刷图文结构、印章印文重合度及擦刮、添加痕迹等微观形态差异，为文件真伪与变造鉴定提供直观可靠的光学分析依据。

工具痕迹的宏观轮廓与线纹匹配比对场景

对于宏观或低倍显微镜下可观察的工具痕迹（如撬压、剪切痕迹），检验人员可使用本设备将现场痕迹与嫌疑工具制作的实验样本痕迹进行投影并排比对，分析其轮廓形态、线条分布等匹配特征，为工具同一认定提供初步的宏观形态学参考。

刑事技术教学与多人协同会检场景

仪器的大屏幕投影特性非常适合用于刑事技术教学，可演示各类痕迹特征；在疑难案件会诊中，便于多位专家同时观察、同步讨论，提升检验结论的可靠性。

核心技术参数

放大倍率方面，提供6.5倍与10倍两档可选。投影屏尺寸最小不小于192mm×165mm。物方视场范围在6.5倍率下约为29.8mm×25.5mm，在10倍率下约为19.4mm×16.6mm。工作距离在低倍率下约为80mm，高倍率下约为47mm。调焦范围约为90mm。电源为AC 220V/50Hz，照明系统采用约300W/120V的卤素灯，提供充足且可调的亮度。

合规实战应用案例

某市公安刑事科学技术研究所指纹检验室受理一起入室盗窃案件的指纹鉴定，需对现场窗框上提取的一枚残缺汗潜指纹与嫌疑人指纹样本进行同一认定。因现场指纹纹线模糊且存在部分变形，自动识别系统未能给出高置信度匹配。检验人员使用本光学指纹比对仪，将现场指纹与嫌疑人指纹分别置于两路载物台上，在10倍放大倍率下并排投影至观察屏上，逐一比对纹型特征、细节特征点的形态与位置关系。经系统比对与综合评断，检验人员认定两枚指纹在同一性认定所需的足够数量特征点上高度吻合，出具了认定同一的鉴定意见。检验人员在舒适的坐姿下完成了全部比对工作，鉴定结论在法庭质证中被依法采信。

厂家信息：北京毕思特联合科技有限公司
网址：https://www.bestlh.com
地址：北京市亦庄开发区经海六路一号院尖子班 C9 独栋
电话：010-56526048

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Optical Fingerprint Comparator — Dual-Channel Synchronized Optical Projection · 6.5X/10X Two-Level Magnification · Wide-Screen Observation · Fingerprint/Document/Tool Mark Side-by-Side Comparison & Examination System

Global site URL：https://xilankeji.en.alibaba.com

〖Important Compliance Precaution〗 This product is a state-controlled specialized equipment for criminal technical forensic examination and identification, solely supplied to authorized entities such as criminal technical departments of public security organs, technical departments of people's procuratorates, forensic identification institutions, and authorized criminal technical laboratories with statutory law enforcement authority and judicial forensic identification qualifications. Any sale or supply to individuals, non-qualified enterprises and unauthorized units is strictly prohibited. The procurement, deployment, use and management of this equipment must strictly comply with relevant national laws, regulations and industrial technical standards. Operation must be carried out exclusively by professionally trained personnel holding corresponding qualifications.

Product Overview

The Optical Fingerprint Comparator — Dual-Channel Synchronized Optical Projection, 6.5X/10X Two-Level Magnification, Wide-Screen Observation, Fingerprint/Document/Tool Mark Side-by-Side Comparison & Examination System (also referred to as the FX-8B Optical Projection Comparator or Optical Projection Comparator) is a professional criminal technical device based on the principle of optical reflective projection. It constitutes a classic optical examination device in the fields of criminal technical fingerprint examination, document examination, and tool mark comparison. This product is deeply customized for synchronously and clearly projecting the images of two evidence samples onto an observation screen for side-by-side magnified observation and detailed feature comparison. It provides two selectable magnification levels and an observation screen size of no less than 192mm × 165mm. It is a foundational examination device that supports the scientificity and objectivity of evidence identification from the optical imaging dimension.

Technical Principle

This instrument operates based on the principle of reflective optical projection. The system features two independent optical projection channels. An illumination system provides ample and adjustable brightness. Light is converged and directed onto the surface of the sample under examination on the stage. The light reflected from the sample, carrying its surface morphology information, is magnified by the objective lens and projected onto the observation screen via a mirror assembly. The two channels image independently, ultimately displaying the magnified images of the two samples side by side on the observation screen. The system provides two selectable magnification levels: 6.5X and 10X, along with adjustable focus range. The observation screen size is no less than 192mm × 165mm, allowing the examiner to observe and discuss in a more comfortable posture, significantly reducing visual and physical fatigue.

Core Functions and Compliance Operational Value

Dual-Channel Synchronized Projection and Side-by-Side Comparison, Providing an Intuitive and Reliable Optical Analysis Platform for Fingerprint Identification and Document Authenticity Examination

The device can place a scene fingerprint sample and a suspect fingerprint sample onto the two stages respectively. After being magnified through independent optical paths, they are projected side by side onto the same observation screen. The examiner can directly observe the patterns, the morphology and positions of minutiae, and their interrelationships on the two fingerprints, performing manual comparison and comprehensive evaluation. This dual-channel synchronized projection capability transforms two samples that originally required alternating monocular observation through a microscope into a synchronized display on the same screen, making points of correspondence and difference between features clear at a glance.

Wide-Screen Projection and Optimized Observation Experience, Enhancing the Sustainability and Comfort of Prolonged Examination Work

The device projects microscopic images onto a large observation screen. The examiner does not need to press their eyes tightly against eyepiece tubes and can observe in a more natural, relaxed sitting posture. This effectively reduces the visual and physical fatigue associated with prolonged visual observation through traditional microscopes. In consultations for difficult cases, the large-screen projection feature allows multiple experts to observe and discuss simultaneously.

Two-Level Magnification and Broad Sample Adaptability, Covering Diverse Examination Needs from Macroscopic Contour Analysis to Microscopic Detail Comparison

The system provides two selectable magnification levels: 6.5X and 10X. At low magnification, the field of view is larger, suitable for macroscopic localization and overall morphological analysis of traces; at high magnification, details are clearer, suitable for the fine comparison of microscopic details such as minutiae and stroke intersections. The device is applicable to surface evidence with a certain degree of reflectivity, meeting the examination needs of various professional scenarios.

Compliant Application Scenarios

Manual Comparison and Comprehensive Evaluation Scenario for Fingerprints and Palm Prints

In fingerprint identification, the examiner uses this device to project the scene fingerprint and the suspect fingerprint sample side by side onto the observation screen, performing systematic manual comparison and comprehensive evaluation. This classic optical comparison method serves as an important supplementary tool to digital automated identification systems.

Handwriting and Stamp Impression Comparison Scenario in Document Examination

In document examination and identification, the examiner uses this device to perform side-by-side projection comparison of the questioned document and standard samples, providing an intuitive and reliable optical analysis basis for document authenticity and alteration identification.

Macroscopic Contour and Striation Matching Comparison Scenario for Tool Marks

For tool marks observable under macroscopic or low-power microscopic conditions, the examiner can use this device to perform side-by-side projection comparison of the scene mark and the experimental sample mark produced by the suspected tool, providing a preliminary macroscopic morphological reference for tool identification.

Core Technical Parameters

Magnification levels are 6.5X and 10X selectable. The observation screen size is no less than 192mm × 165mm. The object field of view is approximately 29.8mm × 25.5mm at 6.5X, and approximately 19.4mm × 16.6mm at 10X. The working distance is approximately 80mm at low magnification and approximately 47mm at high magnification. The focusing range is approximately 90mm. The power supply is AC 220V/50Hz. The illumination system uses an approximately 300W/120V halogen lamp, providing ample and adjustable brightness.

Compliant Field Application Cases

The fingerprint examination laboratory of a municipal criminal technical science research institute accepted a fingerprint identification case for a residential burglary. A partial, faint, and slightly distorted latent sweat fingerprint collected from the scene window frame needed to be compared with a suspect fingerprint sample for identification. The examiner used this Optical Fingerprint Comparator, placing the scene fingerprint and the suspect fingerprint onto the two stages respectively. Under 10X magnification, they were projected side by side onto the observation screen. The pattern features, the morphology and positional relationships of minutiae were compared one by one. After systematic comparison and comprehensive evaluation, the examiner determined that the two fingerprints were highly consistent in a sufficient number of minutiae points required for identification and issued a positive identification opinion. The examiner completed all the comparison work in a comfortable sitting posture. The identification conclusion was lawfully admitted during court cross-examination.

Manufacturer Information: Beijing Best United Technology Co., Ltd.
Website: https://www.bestlh.com
Address: Building C9, Jianziban, No.1 Courtyard, Jinghai Sixth Road, Yizhuang Development Zone, Beijing
Tel: 010-56526048