摘要
基于光谱吸收法设计了一种反射型光谱吸收光纤传感器网络结构,该结构可以完成对远距离多点甲烷气体浓度的实时测量。为了能够保证光谱扫描波长中心值与甲烷气体吸收峰相同,激光光源通过波长调制光谱完成调制,采用调整三角波的幅值与偏移量对光源波长进行调整。在接收端,为了对光电信号进行有效的采集,设计了一种多点高速信号的采集方法,并分析其调制深度的影响。实验证明,软件采集算法以及合适的调制深度能够满足工程中光纤气体传感器多点采集的精度要求。
In order to complete the real-time measurement of long-distance multi-point gas concentration,the writer designed the structure of a reflection-type spectral absorption fiber sensor network. Thelaser light source was modulated by the wavelength modulation spectrum,and the wavelength of thelight source was adjusted with the amplitude and offset of the triangular wave,to ensure that the spec-tral scanning center value was the same as the methane gas absorption peak. At the receiving end,in order to effectively collect the photoelectric signal,a multi-point high-speed signal acquisition softwaremethod was designed in this paper,the influence of its modulation depth was analyzed at the sametime. Experimental results showed that the software acquisition algorithm and the appropriate modulation depth could meet the precision requirements of multi-point acquisition of optical fiber gas sensor inengineering.
出处
《江汉大学学报（自然科学版）》
2017年第5期439-443,共5页
Journal of Jianghan University：Natural Science Edition
基金
国家科技支撑项目(2013BAD11B02
2014BAD14B05-5)
中国科学院科技服务网络计划合作项目(KFJSW-STS-172)
武汉市市属高校产学研结合项目(CXY201401)
关键词
光纤传感器
准分布式
多点采集
调制深度
optical fiber sensor
quasi-distributed
multi-point acquisition
modulation depth
