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在穆斯堡尔谱仪中,驱动速度的质量指标主要在于它的稳定性和非线性。稳定性将在谱线宽度中反映出来,它主要取决于零电平漂移、参考信号幅度的微小不稳定以及驱动电路中放大单元的不对称漂移。而后二者通常在整个速度扫描中可以好于10~(-4)。速度的非线性是一个更重要的指标,它取决于速度参考信号的线性、反馈回路的增益以及拾波线圈响应的线性度(图1)。如果采用多道分析器,道址——道位置间的非线性关系也是一个重要的影响因素。而速度的非线性直接影响谱峰的位置,从而影响所得穆斯堡尔参数的精度。
In Mossbauer spectroscopy, the quality of the driving speed is mainly due to its stability and non-linearity. The stability will be reflected in the line width, which depends mainly on zero-level drift, small instability of the reference signal amplitude, and asymmetric drift of the amplifying unit in the driver circuit. The latter two are usually better than 10 ~ (-4) in the whole speed scan. The nonlinearity of speed is a more important indicator depending on the linearity of the speed reference signal, the gain of the feedback loop, and the linearity of the pickup coil response (Figure 1). If multiple analyzers are used, the non-linear relationship between the address and the lane position is also an important factor. The velocity nonlinearity directly affects the position of the peak, thus affecting the accuracy of the resulting Mössbauer parameters.