摘要
高灵敏度线阵CCD常用于光谱仪的精密科学仪器中,设计优良的光电信号检测系统有利于充分发挥高灵敏度CCD的作用。为了充分发挥高灵敏度CCD的作用,提高脉动光谱信号的质量和仪器的性能,本文在埋沟道型IL-C6-2048C线阵CCD基础上,根据CCD的输出信号是负极性的离散模拟信号并且混杂有幅度较大的复位脉冲干扰的特点,设计电路对CCD输出信号进行适当的预处理。对于预处理后的信号含有1/f噪声和低频噪声的问题,本文采用了相关双采样技术提高了动态光谱检测系统的信噪比。为了提取信号的特征及对信号进行后期处理,本文设计了高速的ADC对CCD信号采集。整套系统可以大幅度提高CCD信号的质量与精度。
High sensitive linear CCD sensor is often used in precise instruments, such as spectrum. It＇s necessary to design high-qualified opto-electronic signal detection to make full use of high sensitive CCD. To exert the use of high sensitive CCD and improve the performance of instruments and the quality of pulsatile signal of spectrum, the paper based on linear CCD of buried channel IL-C6-2048C, the output of which is subtractive polarity and discrete analog signal, and intermixes the high amplitude of reset-pulse, designs the circuit to pre-treat properly to the output＇s signal. As for the problem about the signal pretreated containing the noises of 1/f and low frequency, correlated double sampler （CDS） is used to improve the signal-to-noise ratio （SNR） of the measuring system of dynamic spectrum. Moreover,fast throughput ADC is designed to sample the CCD signals for distilling the features of the signals and further disposing the signals. The whole circuit system designed in this paper can improve the quality and precision of the CCD signals.
出处
《电子测量技术》
2007年第3期178-182,共5页
Electronic Measurement Technology
