75W 氙灯十三波段多功能勘查光源 多光谱痕迹发现与物证检验合规应用介绍
作者：毕思特科技 来源：毕思特科技 浏览数：12 发布时间：2026/6/2 8:55:33
75W 氙灯十三波段多功能勘查光源 多光谱痕迹发现与物证检验合规应用介绍
【重要合规前置声明】本产品为国家管制类刑事技术勘查、司法鉴定专用光学取证特种装备，仅面向具备法定刑事侦查、物证鉴定资质的公安、检察、司法行政、司法鉴定等国家机关及授权单位定向研发、生产与销售，不向任何个人、无资质企业及非授权单位提供。本产品的采购、配备、使用、校准与维护，必须严格遵守《中华人民共和国刑事诉讼法》《中华人民共和国人民警察法》《公安机关刑事案件现场勘验检查规则》《法庭科学多波段光源检验规范》《警用装备管理条例》等国家法律法规与行业技术标准，必须由经过专业刑事照相、痕迹检验培训、取得相应操作资质的刑事技术人员、司法鉴定人规范操作，严禁无资质单位和个人违规购置、使用、转让本装备，严禁因违规操作导致的涉案物证损毁、痕迹灭失、鉴定证据失效、司法程序违法。
产品概述
75W 氙灯十三波段多功能勘查光源，是一款集高强度宽谱照明、多波段光谱精准输出、现场便携与实验室检验于一体的先进多光谱光学取证装备，专为犯罪现场潜在痕迹搜索、生物物证发现、文件检验鉴定、微量物证增强场景深度定制，是刑事科学技术领域进行多光谱勘查与检验的核心刑侦技术装备。系统采用主机与高性能锂电池一体化集成设计，兼具卓越的便携性与持久续航能力，同时支持交流电源直接供电；核心搭载 75W 高亮度氙灯光源与内置式 13 波段滤光轮，可瞬间输出从近紫外、可见光全波段的 13 种精选特定光谱，为发现、增强和记录犯罪现场中肉眼难以辨识的各类潜在痕迹、生物物证、微量物证提供了强大而灵活的光学解决方案，彻底解决了传统单一光源无法适配多类型物证检验、现场与实验室设备无法通用的行业痛点，所生成的影像资料完全符合司法鉴定证据规范要求，可直接作为法庭证据使用。
技术原理
设备核心基于物质光谱响应差异化原理与氙灯宽谱激发技术构建，通过不同波长的光与物证物质的特异性相互作用，实现潜在痕迹的显现与增强。系统核心采用 75W 高功率氙灯光源，可输出覆盖 300nm 至 700nm 的连续宽谱白光，光谱覆盖近紫外至可见光全范围，色温约 6000K，具备光强高、光谱连续、显色性好的特点，为多波段输出提供稳定的基底光源。
内置高精度电动滤光轮集成 13 片专业光学滤光片，可通过一键切换快速滤出特定波长的单色光，输出包括 365nm 紫外、415nm 至 610nm 可见光波段、CSS 犯罪现场搜索优化波段及弱白光减光模式在内的 13 种专用光谱。当特定波长的光照射到物证表面时，不同物质会产生特异性的荧光激发、光吸收或光反射差异：潜在指纹、体液斑迹等生物物证会被特定波段激发产生荧光，被掩盖的字迹会因墨水的光谱吸收差异显现，光滑表面的痕迹会通过偏振光消除反光后清晰呈现。设备配套专业截止型防护眼镜与相机滤色镜，可滤除激发光干扰，仅允许物证产生的荧光或反射光通过，大幅提升成像对比度；全程采用非接触式、非破坏性光学检验方式，不会对涉案物证造成任何损伤，完全符合司法鉴定对物证原始性保护的核心要求。
核心功能与合规实战价值
设备具备专业级全谱系多光谱集成能力，一体化集成了 13 个刑事技术领域最常用的光谱波段，涵盖近紫外、蓝、绿、黄、橙、红全可见光波段，以及专门优化的 CSS 犯罪现场搜索波段、弱白光减光模式，无需携带多个独立光源或外接滤光片，真正实现 “一机多能”。75W 高亮度氙灯提供高强度基底照明，结合精密光学滤光片，确保各波段输出光强充足、光谱纯净，可有效激发微弱痕迹的荧光信号，满足现场大范围搜索与实验室精细检验的双重需求，显著提升勘查效率与痕迹发现率，尤其适用于复杂背景下的潜在痕迹搜索。
设备具备卓越的便携性与全天候续航能力，采用主机与锂电池一体化集成设计，彻底摆脱线缆束缚，整机采用高强度铝合金壳体，兼顾坚固性与散热性能，重量仅约 3.15kg，可单手握持操作，适配单兵携行、车载机动、野外勘查等多种使用场景。内置 12.6V/8.8AH 大容量可充电锂电池，满电状态下可支持连续工作约 90 分钟，完全覆盖绝大多数现场勘查任务的时长需求；同时支持交直流两用供电模式，通过适配器可直接接入 AC 220V 市电使用，完美适配室内实验室长时间精细检验与户外夜间无电源环境下的大范围搜索，实现现场勘查与实验室检验的无缝衔接。
设备具备司法级标准化成像与非破坏性检验能力，全程采用非接触式光学检验方式，不会对涉案物证造成任何物理或化学损伤，保障了物证的原始性与完整性，完全符合《刑事诉讼法》对物证收集、固定的法定要求。标配进口红、橙、黄三色截止型防护眼镜，既保护操作者眼睛免受强光及特定波段伤害，又可辅助观察物证荧光信号；配套同色系相机专用滤色镜，可在相机端进一步滤除激发光干扰，大幅增强目标荧光或反射光的对比度，确保拍摄的影像资料清晰、标准，可直接作为鉴定依据录入证据管理系统，保障了取证过程的规范性与证据的司法效力。
设备具备全场景适配与灵活操作能力，内置滤光轮支持一键快速切换波段，无需繁琐的手动更换滤光片，可根据不同物证类型与检验需求，瞬间切换至对应最佳波段，大幅提升现场勘查的响应速度。系统可适配各类单反相机、体视显微镜等成像设备，实现从现场搜索、初步检验到实验室精细拍照的全流程应用；铝合金壳体具备优异的散热、抗冲击、防尘性能，可在室内外、昼夜、不同温湿度环境下稳定工作，完美适配命案现场、野外山林、室内实验室、车辆内部等复杂勘查场景，满足全天候、全地域的刑事技术勘查需求。
合规应用场景
本设备仅可由具备法定刑事技术勘查、物证鉴定资质的单位与人员，在授权范围内规范使用，核心合规应用场景包括四大类：
一是重大刑事案件现场潜在痕迹搜索与发现，在命案、强奸、盗窃、抢劫等重大刑事案件的现场勘查中，利用不同波段光源对现场地面、墙面、家具、衣物等进行全面搜索，激发并显现经荧光粉末或试剂处理后的潜在指纹、鞋印、工具痕迹，以及精斑、唾液、血迹、尿液等生物物证，尤其适用于复杂背景、深色客体上的微弱痕迹发现，为案件侦查提供关键线索与物证，完全符合《公安机关刑事案件现场勘验检查规则》对现场痕迹物证发现、固定的法定要求。
二是生物物证与微量物证无损检验鉴定，在法医物证、微量物证检验工作中，利用 365nm 紫外、450nm 蓝光等波段，无损定位并区分血迹、精斑、唾液斑、毛发、纤维等生物物证与微量物证，减少对检材 DNA 的损伤，保障后续 DNA 检验的成功率；同时可用于观察并增强射击残留物、爆炸残留物、毒品、腐蚀性物质的特殊荧光或吸收特性，为实验室初步筛查提供现场指引，实现生物物证与微量物证的快速、无损、精准检验。
三是文件检验与变造文件司法鉴定，在文件检验鉴定工作中，利用 490nm、530nm 绿光及 590nm、610nm 橙红光等波段，穿透纸张表层或与不同墨水产生特异性相互作用，有效检测并记录被涂抹、掩盖、漂白消退的字迹，鉴别不同墨水的书写时序，显现纸张上的无墨压痕字迹，为合同纠纷、票据诈骗、伪造证件等案件的司法鉴定提供科学依据，所生成的检验影像可直接作为鉴定意见的附件提交法庭。
四是反恐应急与重大活动安保现场排查，在涉恐涉爆案件现场勘查、重大活动安保排查工作中，利用 CSS 犯罪现场搜索优化波段对可疑场所、车辆、包裹进行快速大范围搜索，发现隐藏的爆炸物残留物、射击残留物、可疑生物痕迹；同时可用于对可疑文件、证件的快速真伪鉴别，为反恐应急处置、重大活动安保提供快速、高效的光学技术支撑，筑牢公共安全防线。
核心技术参数
设备光源核心采用 75W 氙灯，光谱范围覆盖 300nm 至 700nm，包含近紫外与可见光全波段，灯泡额定使用寿命约 3000 小时，白光模式下相关色温约 6000K。供电系统支持交直流两用，内置 12.6V/8.8AH 可充电锂电池组，满电状态下持续工作时间约 90 分钟，同时可通过适配器支持 AC 220V 外部电源直接供电。滤光系统采用内置式电动滤光轮，支持一键快速切换，共预设 13 个输出波段，包括白光全谱、365nm 紫外、415nm、450nm、490nm、510nm、530nm、555nm、570nm、590nm、610nm 特定波长，以及 CSS 犯罪现场搜索优化波段、弱白光减光模式。主机采用铝合金壳体，兼顾坚固性与散热性能，外形尺寸为 305mm (长)×110mm (宽)×140mm (高)，不含手柄高度 115mm，整机重量约 3.15kg。光学安全配件标配进口红色、橙色、黄色截止型防护眼镜各 1 副，以及配套的红色、橙色、黄色相机滤色镜各 1 片，用于保护操作者安全并优化成像效果。
合规实战应用案例
- 某市公安局刑事技术支队勘查一起恶性入室抢劫杀人案，案发现场位于老旧居民楼内，现场被犯罪嫌疑人刻意清理，地面、墙面经过拖洗，传统勘查手段未发现有价值的痕迹物证。勘查人员使用本 75W 氙灯十三波段多功能勘查光源，采用 450nm 蓝光波段对现场卧室、客厅地面及嫌疑人可能接触的家具、门把手进行全面搜索，在卧室床头柜表面成功激发显现出一枚经拖洗后残留的微弱潜在指纹，同时在床沿处发现了一处肉眼无法识别的精斑痕迹；随后切换至 530nm 绿光波段，对嫌疑人遗留在现场的深色外套进行检验，显现出多处喷溅状血迹痕迹。勘查人员使用配套相机滤色镜对上述痕迹进行标准化拍照固定，成功提取到犯罪嫌疑人的指纹与 DNA 信息，通过数据库比对快速锁定犯罪嫌疑人，案件在 48 小时内成功告破。本案中，本设备的多波段荧光激发能力，成功突破了现场被清理后的痕迹发现难题，所提取的痕迹物证被法庭全部采纳，成为案件定罪量刑的核心证据。
- 某市人民检察院委托司法鉴定中心，对一起涉案金额超 2000 万元的合同诈骗案件中的涉案《借款合同》进行文件检验鉴定，案件核心争议焦点为合同落款处的手写签名是否为后期添加变造，由于嫌疑人使用与原合同相同型号的墨水进行添加，传统检验手段无法有效区分。鉴定人使用本 75W 氙灯十三波段多功能勘查光源，依次切换 490nm、530nm、590nm 等不同波段光源对合同落款处进行检验，通过不同墨水对特定波段光的吸收差异，成功发现落款签名处的墨迹光谱特征与合同正文墨迹存在明显差异，且签名笔画存在覆盖正文打印字迹的痕迹，同时利用侧光配合 555nm 波段，显现出签名处纸张表面的刮擦痕迹。最终鉴定人出具了 “合同落款签名系后期添加变造” 的司法鉴定意见，该鉴定意见被法院全部采纳，为案件的公正审判提供了关键的科学依据，成功为受害企业挽回了巨额经济损失。
Application Introduction of 75W Xenon Lamp 13-Band Multi-Functional Investigation Light Source
【Important Compliance Pre-Declaration】This product is a state-controlled special optical evidence collection equipment for criminal technology investigation and judicial authentication. It is only developed, produced and sold for state organs and authorized units with statutory criminal investigation and material evidence authentication qualifications, including public security organs, procuratorates, judicial administrative organs, and judicial authentication institutions, and will not be provided to any individual, unqualified enterprise or non-authorized unit. The procurement, deployment, use, calibration and maintenance of this product must strictly abide by national laws, regulations and industry technical standards such as the Criminal Procedure Law of the People's Republic of China, People's Police Law of the People's Republic of China, Rules for On-Site Investigation and Inspection of Criminal Cases by Public Security Organs, Forensic Science - Specification for Multi-Band Light Source Inspection, and Police Equipment Management Regulations. It must be operated in a standardized manner by criminal technology personnel and judicial appraisers who have received professional criminal photography and trace inspection training and obtained corresponding operation qualifications. It is strictly prohibited for unqualified units and individuals to illegally purchase, use or transfer this equipment, and it is strictly prohibited to cause damage to involved material evidence, loss of traces, invalidation of identification evidence, and violation of judicial procedures due to illegal operation.
Product Overview
The 75W Xenon Lamp 13-Band Multi-Functional Investigation Light Source is an advanced multi-spectral optical evidence collection equipment integrating high-intensity wide-spectrum illumination, precise multi-band spectral output, on-site portability and laboratory inspection. It is deeply customized for potential trace search at crime scenes, biological evidence discovery, document inspection and identification, and micro-material evidence enhancement scenarios. It is the core criminal technology equipment for multi-spectral investigation and inspection in the field of forensic science. The system adopts an integrated design of the main engine and high-performance lithium battery, which has both excellent portability and long battery life, and also supports direct power supply from AC power. The core is equipped with a 75W high-brightness xenon light source and a built-in 13-band filter wheel, which can instantly output 13 kinds of selected specific spectra from near-ultraviolet to full visible light band. It provides a powerful and flexible optical solution for discovering, enhancing and recording various potential traces, biological evidence and micro-material evidence that are difficult to identify by the naked eye at crime scenes. It completely solves the industry pain points that traditional single light sources cannot adapt to the inspection of multiple types of material evidence and that on-site and laboratory equipment cannot be used universally. The generated image data fully meets the requirements of judicial authentication evidence specifications and can be directly used as court evidence.
Technical Principle
The core of the equipment is built based on the principle of differential spectral response of substances and xenon lamp wide-spectrum excitation technology, and realizes the development and enhancement of potential traces through the specific interaction between light of different wavelengths and material evidence substances. The core of the system adopts a 75W high-power xenon light source, which can output continuous wide-spectrum white light covering 300nm to 700nm, with a spectrum covering the full range from near-ultraviolet to visible light, a color temperature of about 6000K, and the characteristics of high light intensity, continuous spectrum and good color rendering, providing a stable base light source for multi-band output.
The built-in high-precision electric filter wheel integrates 13 professional optical filters, which can quickly filter out monochromatic light of specific wavelengths through one-click switching, and output 13 special spectra including 365nm ultraviolet, 415nm to 610nm visible light bands, CSS crime scene search optimized band and low white light dimming mode. When light of a specific wavelength irradiates the surface of the material evidence, different substances will produce specific fluorescence excitation, light absorption or light reflection differences: biological evidence such as latent fingerprints and body fluid stains will be excited by specific bands to produce fluorescence, covered handwriting will appear due to the spectral absorption difference of ink, and traces on smooth surfaces will be clearly presented after eliminating reflected light through polarized light. The equipment is equipped with professional cut-off protective glasses and camera filters, which can filter out excitation light interference and only allow the fluorescence or reflected light generated by the material evidence to pass through, greatly improving the imaging contrast. The whole process adopts non-contact and non-destructive optical inspection methods, which will not cause any damage to the involved material evidence, fully meeting the core requirements of judicial authentication for the protection of the originality of material evidence.
Core Functions and Compliance Practical Value
The equipment has professional full-spectrum multi-spectral integration capability, integrating 13 most commonly used spectral bands in the field of criminal technology, covering near-ultraviolet, blue, green, yellow, orange and red full visible light bands, as well as specially optimized CSS crime scene search band and low white light dimming mode. There is no need to carry multiple independent light sources or external filters, truly realizing "one machine with multiple functions". The 75W high-brightness xenon lamp provides high-intensity base illumination, combined with precision optical filters, to ensure sufficient light intensity and pure spectrum output of each band, which can effectively excite the fluorescence signal of weak traces, meet the dual needs of large-scale on-site search and fine laboratory inspection, significantly improve the investigation efficiency and trace discovery rate, and is especially suitable for potential trace search under complex backgrounds.
The equipment has excellent portability and all-weather battery life. It adopts an integrated design of the main engine and lithium battery, completely getting rid of the shackles of cables. The whole machine adopts a high-strength aluminum alloy shell, which takes into account both sturdiness and heat dissipation performance, with a weight of only about 3.15kg. It can be operated with one hand and is suitable for various usage scenarios such as individual carrying, vehicle mobility and field investigation. The built-in 12.6V/8.8AH large-capacity rechargeable lithium battery can support continuous working for about 90 minutes when fully charged, fully covering the duration requirements of most on-site investigation tasks. At the same time, it supports AC/DC dual power supply mode, and can be directly connected to AC 220V mains power through an adapter, perfectly adapting to long-time fine inspection in indoor laboratories and large-scale search in outdoor night environments without power supply, realizing the seamless connection between on-site investigation and laboratory inspection.
The equipment has judicial-level standardized imaging and non-destructive inspection capabilities. The whole process adopts non-contact optical inspection methods, which will not cause any physical or chemical damage to the involved material evidence, ensuring the originality and integrity of the material evidence, and fully complying with the statutory requirements of the Criminal Procedure Law for the collection and fixation of material evidence. It is equipped with imported red, orange and yellow three-color cut-off protective glasses, which not only protect the operator's eyes from strong light and specific band damage, but also assist in observing the fluorescence signal of material evidence. The matching camera-specific filters of the same color system can further filter out excitation light interference at the camera end, greatly enhance the contrast of target fluorescence or reflected light, ensure that the captured image data is clear and standard, and can be directly used as an identification basis to enter the evidence management system, ensuring the standardization of the evidence collection process and the judicial effect of the evidence.
The equipment has full-scene adaptation and flexible operation capabilities. The built-in filter wheel supports one-click fast switching of bands, without tedious manual replacement of filters. It can instantly switch to the corresponding optimal band according to different material evidence types and inspection requirements, greatly improving the response speed of on-site investigation. The system can be adapted to various imaging equipment such as SLR cameras and stereomicroscopes, realizing the whole process application from on-site search, preliminary inspection to fine photography in the laboratory. The aluminum alloy shell has excellent heat dissipation, impact resistance and dustproof performance, and can work stably in indoor and outdoor, day and night, different temperature and humidity environments. It is perfectly adapted to complex investigation scenarios such as homicide scenes, wild mountains, indoor laboratories, and vehicle interiors, meeting the all-weather and all-region criminal technology investigation needs.
Compliant Application Scenarios
This equipment can only be used in a standardized manner within the authorized scope by units and personnel with statutory criminal technology investigation and material evidence identification qualifications. The core compliant application scenarios include four categories:
First, potential trace search and discovery at major criminal case scenes. In the on-site investigation of major criminal cases such as homicide, rape, theft and robbery, use light sources of different bands to conduct a comprehensive search of the scene ground, walls, furniture, clothing, etc., to excite and develop latent fingerprints, shoe prints, tool marks treated with fluorescent powder or reagents, as well as biological evidence such as seminal stains, saliva, blood stains and urine. It is especially suitable for the discovery of weak traces on complex backgrounds and dark objects, providing key clues and material evidence for case investigation, and fully complying with the statutory requirements of the Rules for On-Site Investigation and Inspection of Criminal Cases by Public Security Organs for the discovery and fixation of on-site trace evidence.
Second, non-destructive inspection and identification of biological evidence and micro-material evidence. In the work of forensic biological evidence and micro-material evidence inspection, use 365nm ultraviolet, 450nm blue light and other bands to non-destructively locate and distinguish biological evidence and micro-material evidence such as blood stains, seminal stains, saliva stains, hair and fibers, reduce the damage to the DNA of the samples, and ensure the success rate of subsequent DNA testing. At the same time, it can be used to observe and enhance the special fluorescence or absorption characteristics of gunshot residues, explosive residues, drugs and corrosive substances, provide on-site guidance for preliminary laboratory screening, and realize rapid, non-destructive and accurate inspection of biological evidence and micro-material evidence.
Third, document inspection and judicial authentication of altered documents. In the work of document inspection and identification, use 490nm, 530nm green light and 590nm, 610nm orange-red light and other bands to penetrate the surface of the paper or interact specifically with different inks, effectively detect and record the handwriting that has been smeared, covered, bleached and faded, identify the writing sequence of different inks, and develop the inkless indentation handwriting on the paper. It provides a scientific basis for the judicial authentication of cases such as contract disputes, bill fraud and forged documents, and the generated inspection images can be directly submitted to the court as an attachment to the identification opinion.
Fourth, anti-terrorism emergency and on-site investigation of major event security. In the on-site investigation of terrorist-related and explosion-related cases and the security investigation of major events, use the CSS crime scene search optimized band to conduct a rapid large-scale search of suspicious places, vehicles and packages, and discover hidden explosive residues, gunshot residues and suspicious biological traces. At the same time, it can be used for rapid authenticity identification of suspicious documents and certificates, providing fast and efficient optical technical support for anti-terrorism emergency disposal and major event security, and building a public security defense line.
Core Technical Parameters
The core light source of the equipment adopts a 75W xenon lamp, with a spectral range covering 300nm to 700nm, including the full band of near-ultraviolet and visible light. The rated service life of the bulb is about 3000 hours, and the correlated color temperature in white light mode is about 6000K. The power supply system supports AC/DC dual use, with a built-in 12.6V/8.8AH rechargeable lithium battery pack, which can work continuously for about 90 minutes when fully charged. At the same time, it can be directly powered by AC 220V external power supply through an adapter. The filter system adopts a built-in electric filter wheel, which supports one-click fast switching, with a total of 13 preset output bands, including full-spectrum white light, 365nm ultraviolet, 415nm, 450nm, 490nm, 510nm, 530nm, 555nm, 570nm, 590nm, 610nm specific wavelengths, as well as CSS crime scene search optimized band and low white light dimming mode. The main engine adopts an aluminum alloy shell, which takes into account both sturdiness and heat dissipation performance. The overall dimension is 305mm (length) × 110mm (width) × 140mm (height), the height without the handle is 115mm, and the weight of the whole machine is about 3.15kg. The optical safety accessories are standard equipped with 1 pair each of imported red, orange and yellow cut-off protective glasses, and 1 piece each of matching red, orange and yellow camera filters, which are used to protect the operator's safety and optimize the imaging effect.
Practical Application Cases
- The Criminal Technology Detachment of the Municipal Public Security Bureau investigated a vicious home robbery and homicide case. The crime scene was located in an old residential building. The scene was deliberately cleaned by the suspect, and the ground and walls were mopped. Traditional investigation methods did not find valuable trace evidence. The investigators used this 75W Xenon Lamp 13-Band Multi-Functional Investigation Light Source to conduct a comprehensive search of the bedroom, living room floor and furniture and door handles that the suspect may have contacted using the 450nm blue light band. A weak latent fingerprint remaining after mopping was successfully excited and developed on the surface of the bedroom bedside table, and a seminal stain trace that could not be recognized by the naked eye was found at the edge of the bed. Then, switching to the 530nm green light band, the dark coat left by the suspect at the scene was inspected, and multiple splashed blood stains were developed. The investigators used the matching camera filters to take standardized photos of the above traces, successfully extracted the suspect's fingerprint and DNA information, and quickly locked the suspect through database comparison. The case was successfully solved within 48 hours. In this case, the multi-band fluorescence excitation capability of this equipment successfully broke through the problem of trace discovery after the scene was cleaned, and the extracted trace evidence was fully adopted by the court, becoming the core evidence for the conviction and sentencing of the case.
- The Judicial Authentication Center entrusted by the People's Procuratorate of a city carried out document inspection and authentication of the involved Loan Contract in a contract fraud case with an involved amount of more than 20 million yuan. The core dispute focus of the case was whether the handwritten signature at the end of the contract was added and altered later. Since the suspect used the same type of ink as the original contract for addition, traditional inspection methods could not effectively distinguish it. The judicial appraiser used this 75W Xenon Lamp 13-Band Multi-Functional Investigation Light Source to inspect the signature at the end of the contract by switching between 490nm, 530nm, 590nm and other different band light sources in turn. Through the absorption difference of different inks to specific band light, it was successfully found that the spectral characteristics of the ink at the signature were significantly different from those of the contract text ink, and the signature strokes had traces covering the printed text of the text. At the same time, using side light combined with the 555nm band, the scraping traces on the paper surface at the signature were developed. Finally, the judicial appraiser issued the judicial authentication opinion that "the signature at the end of the contract was added and altered later", which was fully adopted by the court, providing a key scientific basis for the fair trial of the case and successfully recovering huge economic losses for the victim enterprise.