Simultaneous distributed strain and temperature sensing based on combined Raman-Brillouin scattering using Fabry-Perot lasers
Simultaneous distributed strain and temperature sensing based on combined Raman-Brillouin scattering using Fabry-Perot lasers
复制标题
DOI：
10.1088/0957-0233/21/9/094025
复制
发表时间：
2010-09-01
影响因子：
2.4
通讯作者：
Di Pasquale, Fabrizio
中科院分区：
文献类型：
--
作者：
Bolognini, Gabriele;Soto, Marcelo A.;Di Pasquale, Fabrizio
研究了利用普通法布里-珀罗（FP）激光器等多波长光源，利用混合拉曼-布里渊散射实现同时分布应变和温度传感的可能性。通过采用基于多波长光学本振的自外差检测方案，充分利用FP激光器的优势，允许高功率拉曼强度测量和同时高精度检测每个FP纵向模式的布里渊频移参数。实验结果表明，使用FP激光器可显著降低相干瑞利噪声，增强混合拉曼-布里渊传感的性能；特别是使用1550 nm的标准FP激光器，与使用标准分布反馈激光器相比，在25公里传感距离下，温度（应变）精度提高了约12 dB （7 dB）。
An investigation is performed of the possibility of achieving simultaneous distributed strain and temperature sensing based on hybrid Raman-Brillouin scattering with the use of multi-wavelength optical sources such as common Fabry-Perot (FP) lasers. By employing a self-heterodyne detection scheme based on a multi-wavelength optical local oscillator, the benefits of FP lasers are fully exploited, allowing for high-power Raman intensity measurements and a simultaneous high-accuracy detection of the Brillouin frequency shift parameter for each FP longitudinal mode. Experimental results point out a significant reduction of coherent Rayleigh noise, and highlight the enhanced performance in hybrid Raman-Brillouin sensing when using FP lasers; in particular using standard FP lasers at 1550 nm results in about 12 dB (7 dB) temperature (strain) accuracy improvement at 25 km sensing distance with respect to the use of standard distributed feedback lasers.