准连续信号是一种重要的调制信号形式, 在多个领域有广泛应用。准连续调制激光吸收谱是准连续信号典型应用之一, 具有响应迅速、检测精度高、检测限低的特点。在地震、塌方、火灾等灾害环境下, 由于堆积形成复杂封闭环境或燃烧不充分有可能产生极易燃爆的CO有毒有害气体。因此, 灾害现场破拆机器人进行救援时, 需要对现场的气体环境进行监测和分析, 避免造成二次爆炸伤害。本系统对CO气体展开研究, 采用准连续调制激光吸收谱技术, 搭建测量实验系统, 实施了改变浓度、压力和温度条件的CO测量实验, 得出了准连续调制激光吸收谱2f信号幅值与CO浓度、实际测量时的压力、温度的关系模型。这些关系模型可使破拆机器人在灾害现场根据测量系统实际测得的压力和温度值对CO气体的浓度进行相应的压力以及温度补偿。

Quasi-continuous signal is an important form of modulation signal, which is widely used in many fields. Quasi-continuous modulation laser absorption spectroscopy was one of the typical applications of quasi-continuous signal, includes advantageous features of speediness, sensitivity and accuracy. In the environment of earthquakes, landslides, fires and other disasters, it was possible to produce CO, which was a kind of extremely flammable, explosive, toxic and harmful gas, due to the accumulation of complex closed environment and incomplete combustion. Therefore, to avoid the second explosion injury, rescue robot need to monitor and analyze the gas environment in the disaster scene. CO was the research object in this system. An experimental system for quasi-continuous modulation laser absorption spectroscopy measurement was established. The system has carried out CO measurement experiments by changing concentration, pressure and temperature, achieved the formulas for the relationship between second harmonic signal and CO concentration, pressure and temperature in actual CO measurements respectively. These formulas can be used to automatically compensate CO concentration according to the real-time pressure and temperature value during the rescue robot′s measurement in the disaster scene.(2012YQ06016501); 天津中德应用技术大学科技培育重点项目(zdkt2016-001)