采用分布反馈式半导体激光器作为光源，通过光源调制实现气体体积分数的谐波检测，显著提高了检测的灵敏度。

Using DFB LD as light source, the detection sensitivity has been greatly improved by light source modulation harmonic measurement.

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摘要：针对分布反馈式(DFB)光纤激光器用于水声探测时频响曲线起伏较大的问题，设计了一种开孔套管式封装结构。

Abstract: To reduce the fluctuation of frequency response of a Distributed Feedback (DFB) fiber laser used in underwater sound detection, an encapsulated structure with orifices was designed.

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论述了带反馈分布式信息融合系统中传感器观测维数不同时的状态估计方法。

The method of state estimation is discussed, when radars have different observation dimension in one distributed data fusion system with feedback.

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