基于激光光谱的高温O_2浓度检测技术研究

Detection Technology of High Temperature O_2 Concentration Based on Laser Spectroscopy

O_2作为煤矿自然发火过程的一种关键性特征气体,其浓度的准确检测为煤矿火灾监测预警提供基础分析数据。基于激光光谱吸收（TDLAS）的O_2浓度检测技术具有响应快,稳定性好、抗干扰等优势,介绍了其基本检测原理和系统组成。重点分析系统检测O_2浓度受环境温度变化的影响因素,给出具体的温度补偿方法,并进行实验验证。采用该补偿方法对系统进行温度补偿后,由实验测试数据可知,在30-200℃范围,系统测量误差降至2%以内,大大提高了系统在煤矿现场应用的准确性和可行性。

The oxygen was one key characteristic gas during spontaneous combustion process in coal mine, the 02 concentration detec- tion accurate would provided basis data for coal mine fire monitoring and early-warning. The 02 concentration detection technology that based on TDLAS included characters as following, fast response, good stability, anti-interference and so on. The technology illustrated basic detection principle and system elements. The influence elements of the 02 concentration that influenced by different environment temperature were analyzed specially, and then particular temperature compensation method was put forward and validated by experi- ment. After temperature compensation was applied in system, on the basis of experimental data , system measurement error decreased within 2% during scope of 30 -200℃, the accuracy and feasibility of system that applied in filed imoroved obviously.