快,准确,瓦斯浓度的实时测量是预防煤矿开采灾害的重要任务。为了建立矿井环境中不同位置甲烷气体浓度的准确监测方法,本文研制了一种用于多点甲烷检测的无源光纤传感器。传感器内采用16通道光纤分路器和多通道分时采集模块,能够同时检测甲烷气体在16点的主机。此外,甲烷传感器通过全光学方法连接到监测主机,实现甲烷的无源和远程检测。为了评估甲烷气体传感器的性能,进行了实验以评估其检测范围,响应时间,和稳定性。结果表明,在整个范围内,平均检测误差约为1.84%,响应时间不超过10s。传感器的最低检测限,由1σ标准确定,得到58.42ppm。此外,在不同距离(1公里,2公里,5公里)被发现在很长一段时间内基本上是一致的。这些结果表明,这种无源光纤传感器的开发具有为矿山环境提供方法的巨大潜力,甲烷气体多点在线检测。
Fast, accurate, real-time measurement of gas concentration is an important task for preventing coal mining disasters. In order to develop an accurate monitoring method for
methane gas concentration at different locations in a mine environment, a non-source optical fiber sensor for multi-point
methane detection has been developed in this paper. A 16-channel fiber splitter and a multi-channel time-sharing acquisition module are employed within the sensor, enabling simultaneous detection of
methane gas at 16 points by a host. Furthermore, the methane sensors are connected to the monitoring host via an all-optical method, achieving non-source and long-range detection of
methane. To assess the performance of the methane gas sensor, experiments were conducted to evaluate its detection range, response time, and stability. The results indicated that the average detection error was approximately 1.84% across the full range, and the response time did not exceed 10 s. The minimum detection limit of the sensor, as determined by the 1σ criteria, was obtained as 58.42 ppm. Additionally, the concentrations of
methane gas measured at varying distances (1 km, 2 km, 5 km) were found to be essentially consistent over an extended period. These results suggest that the development of this non-source optical fiber sensor holds significant potential for providing a method for mine environment, multi-point online methane gas detection.