摘要
根据外差检测BOTDR系统的原理和对布里渊散射信号检测的要求,计算了光电检测器中布里渊频散射信号的频谱宽度和输出功率。针对系统对布里渊散射信号进行扫频检测的特殊要求,结合超外差接收机原理,提出了直接下变频和二次下变频两种方案,并对这两种方案的性能及可实现性等进行了系统的分析与比较。
According to the principle of BOTDR system based on heterodyne detection and the requirement of Brillouin scattering detection, spectrum width and output power of the Brillouin scattering in the photo detector has been calculated. For the special requirement of frequency sweeping detection of Brillouin scattering in the system, two kinds of schemes were presented considering the principle of beterodyne receivers, which were direct-down-conversion and twice frequency down-conversion. The performance and the realization of the two kinds of schemes were analyzed and compared respectively.
出处
《电力科学与工程》
2009年第3期42-46,共5页
Electric Power Science and Engineering
关键词
光纤传感
扫频
布里渊散射
外差检测
直接下变频
二次下变频
optical fiber sensor
frequency sweeping
Brillouin scattering
heterodyne detection
direct-down-conversion
twice frequeney down-conversion
