车载天然气泄漏检测装置的结构设计

Structural Design of Vehicle Mounted Natural Gas Leak Detection System

为了设计出灵敏高效的车载天然气泄漏检测装置,分析了国内外天然气泄漏检测系统的发展现状,选择可调谐半导体激光器技术(TDLAS)作为检测系统结构的设计基础。根据车载系统移动特点,选择合适的气体采集方式以构建检测系统的整体设计方案。对该装置的光路结构进行了创新设计,即,调制激光器的扫描信号,通过使用HITRAN数据库选择甲烷的吸收谱线,设计精密温控模块,并用不同体积分数的甲烷气体充入标定池中进行试验,证明其合理性。原理性工程测试结果表明,该装置具有检测灵敏度高、防爆性能良好、结构简单等优点,在天然气管道泄漏检测领域可以推广使用。

In order to design a sensitive and efficient vehicle natural gas leak detection device,in this paper the development status of domestic and international gas leak detection system are analyzed,tuneable diode laser technology （TDLAS） as the basis for the design of the detection system is chosen.According to the moving characteristics of the vehicle system,it selects the appropriate gas acquisition method to build the overall design of the detection system.The innovative design of the optical path structure is carried out.It is modulated laser scanning signal,selected the absorption spectrum of methane by using HITRAN database,designed a precision temperature control module,and used different concentrations of methane gas into the calibration tank for testing to prove its rationality.After the principle of Engineering Testing,the results show that the device has the advantages of high sensitivity,good explosion-proof performance,simple structure and so on.The device can be widely used in the field of natural gas pipeline leakage detection.