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在激光惯性约束聚变(ICF)受激散射光能量信号的检测中,背景噪声的存在严重影响了有用信息的提取。针对该问题,设计了一种新型的可变参数放大滤波电路(VPAFC),并在降噪源分离(DSS)技术的基础上提出了一种信号降噪方法。采用硬件程控放大、带宽可调滤波以及软件降噪处理相结合的方式,既实现了微弱信号的增益可调放大,又有效抑制了有用信号频带外的噪声和频带内的结构化噪声。为测试所设计电路及噪声抑制算法的有效性,构建了微弱光能量信号检测装置和相关的数据采集系统。实验结果表明,该检测方法不但能程控放大微弱信号,而且当信号低至2μV时仍能在输出端使信噪比保持在不低于40dB的水平。
In the detection of energy signal of stimulated-scattered laser (ICF), the presence of background noise seriously affects the extraction of useful information. Aiming at this problem, a novel VPAFC is designed and a signal denoising method is proposed based on DSS technology. The combination of hardware program-controlled amplification, bandwidth tunable filtering and software noise reduction processing not only achieves the adjustable amplification of the weak signal, but also effectively restrains the noise outside the useful signal band and the structured noise in the frequency band. In order to test the validity of the designed circuit and noise suppression algorithm, a weak light energy signal detection device and related data acquisition system were constructed. The experimental results show that this method not only can amplify the weak signals, but also keep the signal-noise ratio at the output not lower than 40 dB when the signal is as low as 2 μV.