Higher spatial resolution of the reflection spectrum measurement of Brillouin dynamic grating (BDG) was achieved by controlling phonon power distribution. We experimentally demonstrate the improvement effect of the light-source intensity-modulation method, proposed recently in a correlation-domain technique, and successfully detected an 8-cm cooled section in a 100-m-long polarization-maintaining fiber. Our method can improve the spatial resolution of BDG measurements, leading to high resolution discriminative and distributed fiber sensing of temperature and strain.

中文翻译：

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通过强度调制相关域技术对布里渊动态光栅光谱进行分布式测量。

通过控制声子功率分布，实现了布里渊动态光栅（BDG）反射光谱测量的更高空间分辨率。我们通过实验证明了最近在相关域技术中提出的光源强度调制方法的改进效果，并成功地在100 m长的保偏光纤中检测到8 cm的冷却截面。我们的方法可以提高BDG测量的空间分辨率，从而实现对温度和应变的高分辨率判别和分布式光纤传感。