远距离激光侦听系统是基于激光干涉测量原理的高科技非接触式音频取证装备，专为刑事侦查、技术侦察及特种安全领域打造，是应对复杂侦查环境、获取关键语音情报、固定特殊视听证据的核心刑事技术装备，可在不侵入目标环境、不暴露侦查行动的前提下，实现远距离密闭空间谈话内容的秘密获取与清晰还原。
系统采用1550nm人眼安全不可见近红外激光，通过发射激光照射目标物体表面，捕捉声波引发的微观振动，经高速光学接收单元与专用算法解调运算，还原原始声波信息，有效侦听距离可达250米，可穿透多层真空玻璃，彻底解决了传统音频监控需物理接触、易暴露、无法突破隔音屏障、远距离侦听效果差的行业痛点。系统具备全天候工作能力，支持定点与车载移动部署，兼顾隐蔽性、灵活性与高保真语音处理能力，全流程符合司法取证规范。
在刑侦与司法鉴定实战中，系统核心应用覆盖四大领域：一是重大刑事案件关键情报获取，远程监控有组织犯罪、毒品交易、暴恐活动的密谋过程，固定核心语音证据，为案件定性与侦查突破提供直接支撑；二是重点嫌疑人长期侦控，通过持续侦听掌握其活动规律、社会关系与犯罪线索，辅助关系网络分析；三是反恐处突与要人警卫，在人质劫持、暴恐事件处置中获取现场实时情报，为战术制定提供依据，同时支撑重大活动安保的潜在威胁排查；四是声像资料司法鉴定，存储的数字化语音文件可作为特殊检材，用于真实性验证、内容识别与说话人鉴别。
实战应用案例：1. 某重大涉毒团伙案件，侦查人员利用本系统在200米外隐蔽部署，穿透双层真空玻璃，清晰获取团伙成员密谋交易的语音内容，锁定交易时间、地点与涉案人员，同步固定完整音频证据，为精准抓捕与案件定罪提供核心支撑；2. 某人质劫持事件中，系统远程侦听室内嫌疑人交谈与人员状态，实时向指挥中心传输关键情报，辅助谈判专家制定沟通策略，为安全解救人质、成功处置事件提供了重要技术保障。
本系统突破了传统音频监控的技术局限，以非接触、远距离、高隐蔽性的核心优势，为依法开展技术侦查、打击高端犯罪提供了尖端手段，其输出的标准化、可追溯音频证据，进一步完善了司法证据体系，是各级公安刑侦、技术侦察、反恐安保部门的核心装备。
厂家信息：北京毕思特联合科技有限公司
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
# Application Introduction of the Long-Distance Laser Eavesdropping System in Criminal Investigation and Forensic Identification
The Long-Distance Laser Eavesdropping System is a high-tech non-contact audio forensics equipment based on the principle of laser interferometry. Specially developed for the fields of criminal investigation, technical reconnaissance and special security, it is a core criminal technical equipment to cope with complex investigation environments, obtain key voice intelligence and fix special audio-visual evidence. It can secretly acquire and clearly restore the conversation content in long-distance closed spaces without invading the target environment or exposing the investigation operation.
The system adopts a 1550nm eye-safe invisible near-infrared laser. By emitting laser to irradiate the surface of the target object, it captures the micro-vibrations caused by sound waves, and restores the original sound wave information through high-speed optical receiving unit and special algorithm demodulation and operation. The effective eavesdropping distance can reach 250 meters, and it can penetrate multiple layers of vacuum glass, thoroughly solving the industry pain points of traditional audio monitoring, such as the need for physical contact, high exposure risk, inability to break through sound insulation barriers, and poor long-distance eavesdropping effect. The system has all-weather working capability, supports fixed-point and vehicle-mounted mobile deployment, balances concealment, flexibility and high-fidelity voice processing capability, and the whole process complies with forensic evidence collection standards.
In the practical operation of criminal investigation and forensic identification, the core applications of the system cover four major areas:
1. Acquisition of key intelligence in major criminal cases: remotely monitor the conspiracy process of organized crimes, drug transactions and terrorist activities, fix core voice evidence, and provide direct support for case characterization and investigation breakthrough;
2. Long-term monitoring of key suspects: continuously grasp their activity rules, social relations and criminal clues through continuous eavesdropping, and assist in the analysis of relationship networks;
3. Counter-terrorism emergency response and VIP protection: obtain real-time on-site intelligence in the disposal of hostage-taking and terrorist attacks, provide a basis for tactical formulation, and support the investigation of potential threats in major event security;
4. Forensic identification of audio-visual data: the stored digital voice files can be used as special specimens for authenticity verification, content identification and speaker identification.
Practical Forensic Application Cases:
1. In a major drug-related gang case, investigators deployed the system secretly 200 meters away, penetrated double-layer vacuum glass, clearly obtained the voice content of the gang members conspiring to trade, locked the transaction time, location and involved persons, and synchronously fixed complete audio evidence, providing core support for accurate arrest and case conviction;
2. In a hostage-taking incident, the system remotely eavesdropped on the conversation of suspects and the status of personnel in the room, transmitted key intelligence to the command center in real time, assisted negotiation experts in formulating communication strategies, and provided important technical guarantee for the safe rescue of hostages and the successful disposal of the incident.
This system breaks through the technical limitations of traditional audio monitoring. With the core advantages of non-contact, long-distance and high concealment, it provides a cutting-edge means for legally carrying out technical investigation and combating high-end crimes. The standardized and traceable audio evidence it outputs further improves the judicial evidence system, and it is core equipment for public security criminal investigation, technical reconnaissance and counter-terrorism security departments at all levels.