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Gas sensing based on optical fibre coupled diode laser spectroscopy : a new approach to sensor systems for safety monitoring

机译：基于光纤耦合二极管激光光谱的气体传感：一种用于安全监控的传感器系统的新方法

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摘要

We describe an entirely passive fibre optic network which senses, amongst other species, CH¬4¬ and CO¬¬2 , with sensitivity and selectivity compatible with safety sensing in the mine environment. The basic principle is that a single laser diode source targeted to a particular species addresses up to 200 sensing points which may be spread over an area of dimensions ten or more km. The detection and processing electronics is typically located with the laser source. Several laser sources can be introduced in parallel to enable monitoring multiple species. The network itself, entirely linked through optical fibre, is inherently intrinsically safe. It is self checking for faults at the sensing location and continuously self calibrating. In the methane sensing mode its sensitivity is sub 100ppm and it responds accurately up to 100% methane. It is therefore capable of detecting extremely hazardous gas pockets which are completely missed by other sensor technologies. The network has demonstrated stability with zero maintenance or recalibration over periods in excess of two years. We believe that this system offers unique benefits in the context of mine safety and ventilation system monitoring.
机译：我们描述了一种完全无源的光纤网络，该网络除其他物种外还以与矿山环境中的安全感测兼容的灵敏度和选择性来感测CH‑4¬和CO‑2。基本原理是，针对特定物种的单个激光二极管光源可处理多达200个传感点，这些传感点可能会散布在十公里或更多公里的区域内。检测和处理电子设备通常与激光源一起放置。可以并行引入多个激光源，以实现监视多个物种。网络本身完全通过光纤连接，本质上是本质安全的。它可以对检测位置的故障进行自我检查，并不断进行自我校准。在甲烷感测模式下，其灵敏度低于100ppm，并且可以准确响应高达100％的甲烷。因此，它能够检测其他传感器技术完全忽略的极危险的气穴。该网络已经证明了稳定性，在超过两年的时间里零维护或重新校准。我们相信，该系统在矿山安全和通风系统监控方面具有独特的优势。

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