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基于布里渊相干域分析(BOCDA)原理,采用布里渊增益和损耗级联的方案优化BOCDA系统,在理论分析和实验验证基础上进行样机研制和功能验证。受激布里渊散射过程中的布里渊增益和损耗效应具有相同的布里渊增益谱特性,它们的级联不仅能提高布里渊净增益、系统信噪比和高精度,同时还可降低系统复杂度和系统成本。使用双平行调制器、两级光放大器、扰偏器、模电优化设计和数据采集处理等单元,研制了一套原理样机。实现了测量空间分辨率达1.6cm、测量精度达10με(或0.5℃)的分布式光纤传感样机。
Based on the principle of Brillouin Coherent Domain Analysis (BOCDA), the BOCDA system is optimized by using the Brillouin gain and loss cascade scheme. The prototype and functional verification are carried out on the basis of theoretical analysis and experimental verification. The Brillouin gain and loss effects in stimulated Brillouin scattering have the same Brillouin gain spectral characteristics, and their cascades not only improve the Brillouin net gain, the system SNR and high precision, but also Reduce system complexity and system costs. Using a dual parallel modulator, a two-stage optical amplifier, a scrambler, a module-based optimization design and a data acquisition and processing unit, a set of principle prototypes was developed. A distributed optical fiber sensing prototype with a spatial resolution of 1.6 cm and a measurement accuracy of 10 με (or 0.5 ° C) is achieved.