实验方法：周期图法、自相关法和协方差法。
Experimental Methods : Chart cycle, since the correlation and covariance method.
通过协方差法和二阶求导法实现了光谱峰位的自动检测；
The automatic peak-seeking algorithm was based on the covariance and second derivative.
从效果上看，格点法接近协方差法，但较自相关法有明显地改善。
The effect of lattice filtering is comparable to covariance method, but much better than autocorrelation method.
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