Simulation of space-domain passive fiber cavity ring-down acetylene gas volume fraction detection
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摘要: 为了更准确地分析空域无源光纤腔衰荡乙炔体积分数检测系统，建立了考虑系统噪声的气体体积分数传感理论模型。采用该模型对空域无源光纤腔衰荡乙炔体积分数检测系统的性能进行了仿真和讨论。结果表明，利用空域无源光纤腔衰荡传感技术，通过测量衰荡距离，可实现灵敏度高达56.226 km-1的乙炔体积分数的测量，稳定性达0.47%，检测极限达260.577×10-6，且稳定性和检测极限还可通过减少光纤腔的固有腔损耗得到进一步的提高。此研究对于体积分数传感系统的优化设计应用具有理论指导意义。
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关键词:
- 传感器技术 /
- 体积分数 /
- 空域无源光纤腔衰荡传感系统 /
- 频移干涉 /
- 灵敏度
Abstract: In order to analyze space-domain passive fiber cavity ring-down acetylene gas volume fraction detection system more accurately, a theoretical model of gas volume fraction sensing system considering system noise was established in this paper. The performance of space-domain passive fiber cavity ring-down acetylene gas volume fraction detection system was simulated and discussed by using this model. Simulation results show that, by using the space-domain passive fiber cavity ring-down sensing technology, the acetylene volume fraction can be monitored by measuring the ring-down distance and the sensitivity of 56.226 km-1 is achieved, the corresponding stability and detection limit can reach 0.47% and 260.577×10-6, which can be further improved by reducing the inherent cavity loss of the fiber cavity. This research has theoretical significance for the optimization design of volume fraction sensing system. -
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图 1 空域无源光纤腔衰荡乙炔气体体积分数传感系统原理图
Figure 1. Schematic diagram of space-domain passive fiber cavity ring-down acetylene gas volume fraction sensing system
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图 2 空域无源光纤腔衰荡气体传感系统在充入纯氮气时的仿真信号
a—时域的差分干涉信号 b—空域的衰荡信号
Figure 2. Simulation signals of space-domain passive fiber cavity ring-down gas sensing system when pure nitrogen was filled
a—differential interference signal in time domain b—ring-down signal in space domain
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图 3 乙炔体积分数对衰荡距离的影响
Figure 3. Effect of acetylene volume fraction on the ring-down distance
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图 4 平均衰荡距离倒数差对乙炔体积分数的响应曲线
Figure 4. Response curve of reciprocal difference of average ring-down distance to the acetylene volume fraction
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