基于单像元多点采样的CCD信号采集电路

发布时间：2018-01-10 08:37

本文关键词：基于单像元多点采样的CCD信号采集电路　出处：《压电与声光》2017年06期 　论文类型：期刊论文

【摘要】：为抑制电荷耦合器件(CCD)读出信号噪声并确保信号完整性,提高微弱拉曼光谱信号的信噪比和光谱准确性,采用了一种单像元多点采样的CCD信号采集新方法。分析了背照式CCD面阵传感器在线性合并(line bining)操作下的时序特点,设计了完整帧信号捕捉算法和单像元多点采样的信号采集电路,完成了采集电路的控制逻辑设计。测试实验结果表明,采用该采集方法设置任意的积分时间,均可捕捉到一帧完整的光谱信号;与常规相关双采样方法相比,其信号均方差可降低51%~63%,极大地抑制了CCD探测器噪声。应用该电路成功采集了人体血液的拉曼光谱信号。
[Abstract]:In order to suppress the noise and ensure the integrity of the signal, the signal-to-noise ratio and spectral accuracy of the weak Raman signal can be improved. A new method of CCD signal acquisition based on single pixel and multi-point sampling is adopted. The timing characteristics of backlit CCD array sensor under linear merging line binding operation are analyzed. A complete frame signal capture algorithm and a single pixel multi-point sampling signal acquisition circuit are designed. The control logic design of the acquisition circuit is completed. The test results show that the acquisition method is used to set arbitrary integration time. Can capture a complete spectral signal; Compared with the conventional correlation double sampling method, the RMS of the signal can be reduced by 51% and 63%, and the noise of the CCD detector is greatly suppressed. The Raman spectrum signal of human blood has been successfully collected by using this circuit.
【作者单位】：重庆大学新型微纳器件与系统技术国防重点学科实验室;重庆大学光电技术及系统教育部重点实验室;
【基金】：国家“八六三”基金资助项目(2015AA021104)
【分类号】：TN386.5
【正文快照】： 0引言拉曼光谱是一种无损的分析技术,拉曼光谱包含分子振动或转动的信息,因而又称分子的“指纹谱”。拉曼光谱受水分子的干扰小,在化学、材料、生物等研究领域有着重要应用。但是,拉曼散射信号极其微弱,极易淹没在噪声中,信噪比很低[1-3],给拉曼光谱信号的探测和采集提出了较

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